TECHNICAL & SERVICE MANUAL
KHS1872 + CH1872
KHS2472 + CH2472
FILE NO.
Destination: North America
DC INVERTER SPLIT SYSTEM AIR CONDITIONER
Indoor Model No. Product Code No.
Outdoor Model No. Product Code No.
KHS1872
KHS2472
1 852 099 85
1 852 099 86
CH1872
CH2472
1 852 330 38
1 852 330 39
Indoor Unit
Outdoor Unit
KHS1872
KHS2472
CH1872
IMPORTANT
These air conditioners employ new
refrigerant R410A.
Pay special attention when
servicing the unit.
CH2472
REFERENCE NO. SM700656-05
Table of Contents
Page
5
1. OPERATING RANGE ...................................................................................................................
2. SPECIFICATIONS
2-1. Unit Specifications .............................................................................................................
6
2-2. Major Component Specifications ....................................................................................... 10
2-3. Other Component Specifications ....................................................................................... 14
3. DIMENSIONAL DATA ..................................................................................................................... 15
4. REFRIGERANT FLOW DIAGRAM
4-1. Refrigerant Flow Diagram ................................................................................................... 18
5. PERFORMANCE DATA
5-1. Temperature Charts ............................................................................................................ 19
5-2. Cooling Capacity ................................................................................................................ 23
5-3. Cooling Capacity (Low Ambient) ......................................................................................... 25
5-4. Heating Capacity ................................................................................................................ 27
5-5. Air Throw Distance Charts ................................................................................................. 29
6. ELECTRICAL DATA
6-1. Electrical Characteristics .................................................................................................... 31
6-2. Electric Wiring Diagrams .................................................................................................... 33
7. MAINTENANCE
7-1. Address Setting of the Remote Control Unit ....................................................................... 36
7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit .................................. 37
8. FUNCTIONS
8-1. Operation Functions ........................................................................................................... 38
8-2. Protective Functions ........................................................................................................... 40
9. TROUBLESHOOTING
9-1. Precautions before Performing Inspection or Repair ........................................................... 42
9-2. Method of Self-Diagnostics ................................................................................................. 42
9-3. Checking the Indoor and Outdoor Units .............................................................................. 45
9-4. Trouble Diagnosis of Fan Motor ........................................................................................... 49
9-5. Noise Malfunction and Electromagnetic Interference .......................................................... 51
3
Page
10. CHECKING ELECTRICAL COMPONENTS
10-1. Measurement of Insulation Resistance ............................................................................... 52
10-2. Checking Continuity of Fuse on PCB Ass'y ......................................................................... 53
11. REFRIGERANT R410A:
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
11-1. Characteristics of New Refrigerant R410A ......................................................................... 54
11-2. Checklist before Servicing ................................................................................................... 55
11-3. Tools Specifically for R410A ................................................................................................ 56
11-4. Tubing Installation Procedures ............................................................................................ 56
11-5. In Case of Compressor Malfunction .................................................................................... 57
11-6. In Case Refrigerant is Leaking ............................................................................................ 59
11-7. Charging Additional Refrigerant .......................................................................................... 60
11-8. Retro-Fitting Existing Systems ............................................................................................ 60
APPENDIX A INSTRUCTION MANUAL .......................................................................................... A-1
APPENDIX B INSTALLAION INSTRUCTIONS ............................................................................... A-2
4
1. OPERATING RANGE
Temperature
Indoor Air Intake Temp.
95 °F D.B. / 71 °F W.B.
67 °F D.B. / 57 °F W.B.
80 °F D.B. / 67 °F W.B.
Outdoor Air Intake Temp.
115 °F D.B.
Maximum
Cooling
Minimum
0 °F D.B.
Maximum
Heating
Minimum
75 °F D.B. / 65 °F W.B.
0 °F D.B.
_
_
D.B. / W.B.
5
2. SPECIFICATIONS
2-1. Unit Specifications
Indoor Unit
KHS1872
Outdoor Unit CH1872
< 230V >
Voltage Rating
230V Single-Phase 60Hz
Cooling Heating
BTU/h 17,500 ( 4,000 to 17,500 )
Total Capacity
20,400 ( 4,400 to 20,400 )
kW
5.15 ( 1.2 to 5.15 )
13,100
6.0 ( 1.3 to 6.0 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
-
BTU/h
BTU/h
4,400
-
ft3/min (m3/h)
524 (890)
4.89
541 (920)
-
Pints/h
V
187 to 253
A
W
7.0
( 1.2 to 7.0 )
7.4 ( 1.3 to 7.4 )
1,500 ( 250 to 1,500 )
1,575 ( 270 to 1,575 )
Power Factor
%
93
11.7
-
93
-
EER
BTU/h/W
W/W
BTU/Wh
BTU/Wh
A
COP
3.81
-
SEER
20
-
HSPF
10
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
17.5
20
A
Microprocessor / I.C. Thermister
Wireless Remote Control Unit
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi, Me, Lo)
Manual
Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Airflow Direction (Indoor)
Vertical
Auto
Air Filter
Washable, Anti-Mold
Compressor
DC Twin Rotary (Inverter)
R410A / 2.87 (1,300)
Refrigerant / Amount charged at shipment
Refrigerant Control
Ibs (g)
Electric Expansion Valve
Operation Sound
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
42 / 38 / 30 / 28
51
41 / 38 / 30 / 28
52
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Flare Type
25 (7.5)
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
1/4 (6.35)
1/2 (12.7)
Tube Diameter
Refrigerant Tube Kit / Accessories
Optional / Air Clean Filter
Indoor Unit Outdoor Unit
inch 11-23/32 × 41-15/16 × 8-19/32 26-3/8 × 34-21/32 × 11-7/32
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
inch
(298 × 1,065 × 218)
11-3/8 × 44-7/8 × 14-29/32
(289 × 1,140 × 379)
26.5 (12.0)
(670 × 880 × 285)
29-1/8 × 39-27/32 × 14-31/32
(740 × 1,012 × 380)
97.0 (44.0)
(mm)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
105.8 (48.0)
Shipping Volume
4.23 (0.12)
9.88 (0.28)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80°F D.B. / 67°F W.B.
Outdoor air temperature 95°F D.B. / 75°F W.B.
Heating: Indoor air temperature 70°F D.B.
Outdoor air temperature 47°F D.B. / 43°F W.B.
6
Indoor Unit
KHS1872
Outdoor Unit CH1872
< 208V >
Voltage Rating
208V Single-Phase 60Hz
Cooling Heating
BTU/h 17,500 ( 4,000 to 17,500 )
Total Capacity
20,400 ( 4,400 to 20,400 )
kW
5.15 ( 1.2 to 5.15 )
13,100
6.0 ( 1.3 to 6.0 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
-
BTU/h
BTU/h
4,400
-
ft3/min (m3/h)
524 (890)
4.89
541 (920)
-
Pints/h
V
187 to 253
A
W
7.7
( 1.2 to 7.7 )
8.1 ( 1.3 to 8.1 )
1,500 ( 250 to 1,500 )
1,575 ( 270 to 1,575 )
Power Factor
%
94
11.7
-
93
-
EER
BTU/h/W
W/W
BTU/Wh
BTU/Wh
A
COP
3.81
-
SEER
20
-
HSPF
10
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
17.5
20
A
Microprocessor / I.C. Thermister
Wireless Remote Control Unit
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi, Me, Lo)
Manual
Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Airflow Direction (Indoor)
Vertical
Auto
Air Filter
Washable, Anti-Mold
Compressor
DC Twin Rotary (Inverter)
R410A / 2.87 (1,300)
Refrigerant / Amount charged at shipment
Refrigerant Control
Ibs (g)
Electric Expansion Valve
Operation Sound
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
42 / 38 / 30 / 28
51
41 / 38 / 30 / 28
52
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Flare Type
25 (7.5)
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
1/4 (6.35)
1/2 (12.7)
Tube Diameter
Refrigerant Tube Kit / Accessories
Optional / Air Clean Filter
Indoor Unit Outdoor Unit
inch 11-23/32 × 41-15/16 × 8-19/32 26-3/8 × 34-21/32 × 11-7/32
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
inch
(298 × 1,065 × 218)
11-3/8 × 44-7/8 × 14-29/32
(289 × 1,140 × 379)
26.5 (12.0)
(670 × 880 × 285)
29-1/8 × 39-27/32 × 14-31/32
(740 × 1,012 × 380)
97.0 (44.0)
(mm)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
105.8 (48.0)
Shipping Volume
4.23 (0.12)
9.88 (0.28)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80°F D.B. / 67°F W.B.
Outdoor air temperature 95°F D.B. / 75°F W.B.
Heating: Indoor air temperature 70°F D.B.
Outdoor air temperature 47°F D.B. / 43°F W.B.
7
Indoor Unit
KHS2472
Outdoor Unit CH2472
< 230V >
Voltage Rating
230V Single-Phase 60Hz
Cooling Heating
BTU/h 24,200 ( 4,000 to 24,200 )
Total Capacity
29,000 ( 4,400 to 29,000 )
kW
7.1
( 1.2 to 7.1 )
14,800
8.5 ( 1.3 to 8.5 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
-
BTU/h
BTU/h
9,400
-
ft3/min (m3/h)
600 (1,020)
4.89
653 (1,110)
-
Pints/h
V
187 to 253
A
W
10.8 ( 1.3 to 10.8 )
12.0 ( 1.3 to 12.0 )
2,355 ( 280 to 2,355 )
2,490 ( 290 to 2,490 )
Power Factor
%
95
10.3
-
90
-
EER
BTU/h/W
W/W
BTU/Wh
BTU/Wh
A
COP
3.41
-
SEER
17
-
HSPF
8.5
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
17.5
20
A
Microprocessor / I.C. Thermister
Wireless Remote Control Unit
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi, Me, Lo)
Manual
Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Airflow Direction (Indoor)
Vertical
Auto
Air Filter
Washable, Anti-Mold
Compressor
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Refrigerant / Amount charged at shipment
Refrigerant Control
Ibs (g)
Electric Expansion Valve
Operation Sound
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
47 / 44 / 41 / 30
55
46 / 43 / 40 / 30
56
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Flare Type
33 (10)
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
1/4 (6.35)
5/8 (15.88)
Tube Diameter
Refrigerant Tube Kit / Accessories
Optional / Air Clean Filter
Indoor Unit Outdoor Unit
inch 11-23/32 × 41-15/16 × 8-19/32 29-1/8 × 35-7/16 × 12-19/32
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
inch
(298 × 1,065 × 218)
11-3/8 × 44-7/8 × 14-29/32
(289 × 1,140 × 379)
26.5 (12.0)
(740 × 900 × 320)
33-27/32 × 40-5/8 × 16-1/4
(860 × 1,032 × 413)
130.1 (59.0)
(mm)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
138.9 (63.0)
Shipping Volume
4.23 (0.12)
12.71 (0.36)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80°F D.B. / 67°F W.B.
Outdoor air temperature 95°F D.B. / 75°F W.B.
Heating: Indoor air temperature 70°F D.B.
Outdoor air temperature 47°F D.B. / 43°F W.B.
8
Indoor Unit
KHS2472
Outdoor Unit CH2472
< 208V >
Voltage Rating
208V Single-Phase 60Hz
Cooling Heating
BTU/h 24,200 ( 4,000 to 24,200 )
Total Capacity
29,000 ( 4,400 to 29,000 )
kW
7.1
( 1.2 to 7.1 )
14,800
8.5 ( 1.3 to 8.5 )
Sensible Capacity
Latent Capacity
Air Circulation (High)
Moisture Removal (High)
Available Voltage Range
Running Amperes
Power Input
-
BTU/h
BTU/h
9,400
-
ft3/min (m3/h)
600 (1,020)
4.89
653 (1,110)
-
Pints/h
V
187 to 253
A
W
12.1 ( 1.3 to 12.1 )
13.5 ( 1.3 to 13.5 )
2,355 ( 280 to 2,355 )
2,490 ( 290 to 2,490 )
Power Factor
%
94
10.3
-
89
-
EER
BTU/h/W
W/W
BTU/Wh
BTU/Wh
A
COP
3.41
-
SEER
17
-
HSPF
8.5
Compressor Locked Rotor Amperes
Fuse or Circuit Breaker Capacity
Controls / Temperature Control
Control Unit
17.5
20
A
Microprocessor / I.C. Thermister
Wireless Remote Control Unit
24-Hour ON or OFF Timer, 1-Hour OFF Timer
Auto and 3 steps / Auto (Hi, Me, Lo)
Manual
Timer
Fan Speeds
Indoor / Outdoor
Horizontal
Airflow Direction (Indoor)
Vertical
Auto
Air Filter
Washable, Anti-Mold
Compressor
DC Twin Rotary (Inverter)
R410A / 4.30 (1,950)
Refrigerant / Amount charged at shipment
Refrigerant Control
Ibs (g)
Electric Expansion Valve
Operation Sound
Indoor : Hi/Me/Lo/Qt*
Outdoor : Hi
dB-A
dB-A
47 / 44 / 41 / 30
55
46 / 43 / 40 / 30
56
(*Qt = Quiet mode)
Refrigerant Tubing Connections
Flare Type
33 (10)
Max. allowable tubing length at shipment
ft (m)
inch (mm)
inch (mm)
Refrigerant
Narrow tube
Wide tube
1/4 (6.35)
5/8 (15.88)
Tube Diameter
Refrigerant Tube Kit / Accessories
Optional / Air Clean Filter
Indoor Unit Outdoor Unit
inch 11-23/32 × 41-15/16 × 8-19/32 29-1/8 × 35-7/16 × 12-19/32
Unit Dimensions
Height × Width × Depth
Package Dimensions
Height × Width × Depth
(mm)
inch
(298 × 1,065 × 218)
11-3/8 × 44-7/8 × 14-29/32
(289 × 1,140 × 379)
26.5 (12.0)
(740 × 900 × 320)
33-27/32 × 40-5/8 × 16-1/4
(860 × 1,032 × 413)
130.1 (59.0)
(mm)
Weight
Net
Ibs (kg)
Ibs (kg)
cu.ft (m3)
Shipping
33.1 (15.0)
138.9 (63.0)
Shipping Volume
4.23 (0.12)
12.71 (0.36)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
Remarks: Rating conditions are:
Cooling: Indoor air temperature 80°F D.B. / 67°F W.B.
Outdoor air temperature 95°F D.B. / 75°F W.B.
Heating: Indoor air temperature 70°F D.B.
Outdoor air temperature 47°F D.B. / 43°F W.B.
9
2-2. Major Component Specifications
2-2-1. Indoor Unit
Indoor Unit
KHS1872
Control PCB
Part No.
Controls
CB-KHS1872
Microprocessor
250V 3A
Control Circuit Fuse
Remote Control Unit
RCS-4HVPIS4U
Fan
Type
Cross-Flow
Q'ty ... Dia. and Length
inch (mm)
1 ... D3-11/16 / L33-9/32 (D94/L845)
Fan Motor
Type
DC Motor
Model ... Q'ty
SIC-39CVL-D847-2-A ... 1
No. of Poles
8
Rough Measure RPM (Cool / Heat)
Nominal Output
Coil Resistance
1,250 / 1,300
W
30
-
Ohm
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over-Current Protection
Over-Heat Protection
Run Capacitor
Yes
Yes
Micro F
VAC
-
-
Flap Motor
Type
Stepping Motor
MP24Z3-12V
Model
Rating
DC 12V
Coil Resistance
Ohm
Each Pair of Terminal : 400 +/- 7%
(Ambient Temp. 77 °F (25 °C))
Heat Exchanger Coil
Coil
Aluminum Plate Fin / Copper Tube
Rows
2
Fins Per inch
Face Area
19.5
ft2 (m2)
3.07 (0.285)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
10
Indoor Unit
KHS2472
Control PCB
Part No.
Controls
CB-KHS2472
Microprocessor
250V 3A
Control Circuit Fuse
Remote Control Unit
RCS-4HVPIS4U
Fan
Type
Cross-Flow
Q'ty ... Dia. and Length
inch (mm)
1 ... D3-11/16 / L33-9/32 (D94/L845)
Fan Motor
Type
DC Motor
Model ... Q'ty
SIC-39CVL-D847-2-A ... 1
No. of Poles
8
Rough Measure RPM (Cool / Heat)
Nominal Output
Coil Resistance
1,500 / 1,550
W
30
-
Ohm
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over-Current Protection
Over-Heat Protection
Run Capacitor
Yes
Yes
Micro F
VAC
-
-
Flap Motor
Type
Stepping Motor
MP24Z3-12V
Model
Rating
DC 12V
Coil Resistance
Ohm
Each Pair of Terminal : 400 +/- 7%
(Ambient Temp. 77 °F (25 °C))
Heat Exchanger Coil
Coil
Aluminum Plate Fin / Copper Tube
Rows
2
Fins Per inch
Face Area
19.5
ft2 (m2)
3.07 (0.285)
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
11
2-2-2. Outdoor Unit
Outdoor Unit CH1872
Control PCB
Part No.
CB-CH1872
Microprocessor
250V 25A
Controls
Control Circuit Fuse
Compressor
Type
DC Twin Rotary (Hermetic)
C-6RVN93H0M / 1,050W
FV50S ... 0.74 (350)
R - S : 0.482
Compressor Model / Nominal Output
Compressor Oil ... Amount
Pints (cc)
Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm
S - T : 0.482
T - R : 0.482
Safety Device
CT (Peak current cut-off control)
Compressor Discharge Temp. Control
Operation cut-off control in abnormal ambient Temp.
Yes
Yes
Yes
Overload Relay
Model
Operation Temp.
Micro F
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
Run Capacitor
-
-
-
VAC
Crankcase Heater
Fan
Type
Propeller
Q'ty ... Dia.
inch (mm)
1 ... D16-17/32 (D420)
Fan Motor
Type
DC Motor
Model ... Q'ty
DAJ12-55J71A-CU ... 1
No. of Poles
8
820 / 850
50
Rough Measure RPM (Cool / Heat)
Nominal Output
W
Coil Resistance
Ohm
RED - WHT : 77.5
WHT - BLU : 77.5
BLU - RED : 77.5
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over- Current Protection
Run Capacitor
Yes
Micro F
VAC
-
-
Heat Exchanger Coil
Coil
Aluminum Plate Fin / Copper Tube
Rows
2
Fins per inch
Face Area
21.2
ft2 (m2)
5.49 (0.510)
External Finish
Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
12
Outdoor Unit CH2472
Control PCB
Part No.
CB-CH2472
Microprocessor
250V 25A
Controls
Control Circuit Fuse
Compressor
Type
DC Twin Rotary (Hermetic)
G8T265FU1JW / 2,410W
FV50S ... 1.49 (700)
U - V : 0.36
Compressor Model / Nominal Output
Compressor Oil ... Amount
Pints (cc)
Coil Resistance (Ambient Temp. 68 °F (20 °C)) Ohm
V - W : 0.36
W - U : 0.36
Safety Device
CT (Peak current cut-off control)
Compressor Discharge Temp. Control
Operation cut-off control in abnormal ambient Temp.
Yes
Yes
Yes
Overload Relay
Model
Operation Temp.
Micro F
CS-7L115
Open : 239 °F (115 °C), Close : 203 °F (95 °C)
Run Capacitor
-
VAC
-
Crankcase Heater
230V 30W
Fan
Type
Propeller
Q'ty ... Dia.
inch (mm)
1 ... D18-1/8 (D460)
Fan Motor
Type
DC Motor
Model ... Q'ty
SIC-71FW-D490-1 ... 1
No. of Poles
8
850 / 850
90
Rough Measure RPM (Cool / Heat)
Nominal Output
W
Coil Resistance
Ohm
-
(Ambient Temp. 68 °F (20 °C))
Safety Device
Type
Internal Controller
Over- Current Protection
Over- Heat Protection
Run Capacitor
Yes
Yes
Micro F
VAC
-
-
Heat Exchanger Coil
Coil
Aluminum Plate Fin / Copper Tube
Rows
2
Fins per inch
Face Area
18.1
ft2 (m2)
6.40 (0.595)
External Finish
Acrylic baked-on enamel finish
DATA SUBJECT TO CHANGE WITHOUT NOTICE.
13
2-3. Other Component Specifications
Indoor Unit
KHS1872
KHS2472
Outdoor Unit CH1872
CH2472
• Indoor heat exchanger sensor
(Model:PTM-D51H-S3-2 TH1)
• Compressor temp sensor
(Model:TKS293B)
• Indoor air temp sensor
(Model:PTM-D51H-S3-2 TH2)
10
9
8
7
6
5
4
3
2
1
0
200
180
160
140
120
100
80
60
40
20
0
50 59 68 77 86 95 104
(10) (15) (20) (25) (30) (35) (40)
32 50 68 86 104 122 140 158 176 194
(0) (10)(20) (30) (40)(50) (60) (70)(80) (90)
Temperature °F (°C)
Temperature °F (°C)
• Outdoor air temp sensor
(Model:TKS295B)
• Outdoor heat exchanger sensor
(Model:TKS292B)
40
35
30
25
20
15
10
5
0
-
-
4
20)(
5
14 23 32 41 50 59 68
10) ( 5) (0) (5) (10) (15) (20)
Temperature °F (°C)
(
-
15)(
-
-
14
3. DIMENSIONAL DATA
Indoor Unit
KHS1872
KHS2472
Unit: inch(mm)
15
Outdoor Unit CH1872
23-15/16
5-11/32
15/32
11-17/32
Wide tube service valve
dia.1/2" (12.70)
34-21/32(880)
2-17/32
Narrow tube service valve
dia.1/4" (6.35)
3/32
5-23/32
1-13/16
2-13/32
Unit: inch(mm)
16
Outdoor Unit CH2472
23-15/16
5-11/32
15/32
11-17/32
Narrow tube service valve
dia.1/4" (6.35)
35-7/16(900)
2-15/16
Wide tube service valve
dia.5/8" (15.88)
2-1/32
4-1/2
1-21/32
2-7/8
Unit: inch(mm)
17
4. REFRIGERANT FLOW DIAGRAM
4-1. Refrigerant Flow Diagram
Indoor Unit
KHS1872
KHS2472
Outdoor Unit CH1872
CH2472
Indoor unit
Outdoor unit
Accumulator
Wide tube
service
valve
Wide tube
*1
High pressure
switch
Muffler
H.P.
4-way
valve
Capillary
tube for
split flow
Electric
expansion
valve
Narrow
tube
service
valve
M
Narrow tube
Cooling cycle
(Defrosting cycle)
Strainer
O.D.
1/4"
(6.35 mm)
Heating cycle
*1 O.D.1/2"(12.7 mm) ......... 1872 class
O.D.5/8"(15.88 mm) ......... 2472 class
Insulation of Refrigerant Tubing
IMPORTANT
Because capillary tubing is used in the outdoor unit, both the
wide and narrow tubes of this air conditioner become cold. To
prevent heat loss and wet floors due to dripping of
condensation, both tubes must be well insulated with a
proper insulation material. The thickness of the insulation
should be a min. 5/16"(8 mm).
Insulation
Thickness:
Min. 5/16"(8 mm)
Thickness:
Min. 5/16"(8 mm)
Narrow tube
After a tube has been insulated,
Wide tube
never try to bend it into a narrow
CAUTION
curve because it can cause the tube
to break or crack.
18
5. PERFORMANCE DATA
5-1. Temperature Charts
Indoor Unit
KHS1872
Outdoor Unit CH1872
Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)
(1) Low pressure performance chart
174
(1.2)
Lo fan
Hi Fan
159
(1.1)
145
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
(0.5)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor inlet air D.B. temp.°F(°C)
(2) Operating current performance chart
8
Lo fan
Hi Fan
7
6
5
4
3
2
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor inlet air D.B. temp.°F(°C)
(3) Indoor discharge air performance chart
64.4 (18)
Lo fan
Hi Fan
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
46.4 (8)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor inlet air D.B. temp.°F(°C)
NOTE
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
19
Indoor Unit
KHS1872
Outdoor Unit CH1872
Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)
(1) High pressure performance chart
494
(3.4)
421
(2.9)
348
(2.4)
275
(1.9)
23
(–5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
Outdoor inlet air D.B. temp. °F(°C)
(2) Operating current performance chart
11
10
9
8
7
6
5
23
(–5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
Outdoor inlet air D.B. temp. °F(°C)
(3) Indoor discharge air performance chart
131(55)
122(50)
113(45)
104(40)
95(35)
86(30)
23
(–5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
Outdoor inlet air D.B. temp. °F(°C)
NOTE
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
• Overload prevention operates to protect the air conditioner when outdoor ambient temperature becomes extremely high in
heating mode. (Refer to "8-2. Overload prevention during heating.")
20
Indoor Unit
KHS2472
Outdoor Unit CH2472
Cooling Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)
(1) Low pressure performance chart
174
(1.2)
Lo fan
Hi Fan
159
(1.1)
145
(1.0)
131
(0.9)
117
(0.8)
104
(0.7)
90
(0.6)
76
(0.5)
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor inlet air D.B. temp.°F(°C)
(2) Operating current performance chart
14
Lo fan
Hi Fan
13
12
11
10
9
8
7
6
5
4
-4
(-20)
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
Outdoor inlet air D.B. temp.°F(°C)
(3) Indoor discharge air performance chart
68.0 (20)
Lo fan
Hi Fan
64.4 (18)
60.8 (16)
57.2 (14)
53.6 (12)
50.0 (10)
46.4 (8)
42.8 (6)
-4
5
(-15)
14
(-10)
23
(-5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
86
(30)
95
(35)
104
(40)
(-20)
Outdoor inlet air D.B. temp.°F(°C)
NOTE
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
21
Indoor Unit
KHS2472
Outdoor Unit CH2472
Heating Characteristics (RH : 46%, Indoor fan speed : High fan) (60Hz, 230V)
(1) High pressure performance chart
494
(3.4)
421
(2.9)
348
(2.4)
275
(1.9)
23
(–5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
Outdoor inlet air D.B. temp. °F(°C)
(2) Operating current performance chart
16
15
14
13
12
11
10
23
(–5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
Outdoor inlet air D.B. temp. °F(°C)
(3) Indoor discharge air performance chart
131(55)
122(50)
113(45)
104(40)
95(35)
86(30)
23
(–5)
32
(0)
41
(5)
50
(10)
59
(15)
68
(20)
77
(25)
Outdoor inlet air D.B. temp. °F(°C)
NOTE
• Check each performance value in test-run mode. Electrical performance values represent a combined indoor/outdoor value.
• Overload prevention operates to protect the air conditioner when outdoor ambient temperature becomes extremely high in
heating mode. (Refer to "8-2. Overload prevention during heating.")
22
5-2. Cooling Capacity
Indoor Unit
: KHS1872
Outdoor Unit : CH1872
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY:
17,500 BTU/h
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
524 CFM
INDOOR
ENT. TEMP. oF (oC)
W.B.
D.B.
65
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
17,710
17,180
16,600
16,040
15,320
10,530
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
13,110
14,840
16,670
17,710
17,710
12,910
14,640
16,370
17,180
17,180
12,610
14,340
16,060
16,600
16,600
12,300
14,030
15,860
16,040
16,040
12,000
13,720
15,320
15,320
15,320
9,760
10,530
10,530
10,530
10,530
59
(15.0)
TC
18,460
17,920
17,330
16,770
16,040
10,770
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
11,080
12,810
14,640
16,370
18,100
10,880
12,610
14,340
16,060
17,790
10,570
12,300
14,130
15,860
17,330
10,370
12,000
13,830
15,560
16,770
9,960
11,690
13,520
15,250
16,040
7,720
9,450
63
(17.2)
10,770
10,770
10,770
TC
19,190
18,650
18,060
# 17,500
16,750
10,980
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,050
10,780
12,500
14,230
15,960
8,740
10,470
12,300
14,030
15,760
8,540
10,270
12,100
13,830
15,450
8,330
8,030
9,760
5,790
7,520
67
10,060
11,790
13,520
15,250
(19.4)
11,490
13,220
14,950
9,250
10,980
10,980
TC
19,880
19,350
18,760
18,220
17,460
11,160
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,810
8,540
6,600
8,330
6,400
8,130
6,200
7,930
9,660
11,390
13,110
5,890
7,620
3,650
5,380
7,210
8,940
10,670
71
(21.7)
10,270
12,000
13,720
10,060
11,790
13,520
9,860
9,350
11,590
13,320
11,080
12,810
TC
20,470
19,940
19,350
18,830
18,070
11,270
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,300
8,130
9,860
11,590
6,200
7,930
9,660
11,390
5,990
7,720
9,450
11,180
5,790
7,620
9,350
10,980
5,490
7,320
9,050
10,780
3,350
5,180
6,910
8,640
(23.9)
TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)
NOTE
1.
Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) D.B. / 67 °F (19.4 °C) W.B.
: Outdoor Ambient Temp. 95 °F (35 °C) D.B.
2.
Above data does not take Freeze Prevention Protection during cooling operation into account.
For this reason, the value may vary from the actual cooling characteristics.
3. Above data represents the value when the operation frequency of a compressor is fixed.
23
Indoor Unit
: KHS2472
Outdoor Unit : CH2472
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity >
RATING CAPACITY:
24,200 BTU/h
AIR FLOW RATE:
OUTDOOR
AMBIENT TEMP. oF (oC)
600 CFM
INDOOR
ENT. TEMP. oF (oC)
W.B.
D.B.
65
75
85
95
105
115
(18.3)
(23.9)
(29.4)
(35.0)
(40.6)
(46.1)
TC
24,430
23,750
23,010
22,310
18,420
11,170
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
17,180
19,050
21,030
23,010
24,430
16,720
18,700
20,680
22,660
23,750
16,370
18,230
20,330
22,200
23,010
16,020
17,880
19,860
21,850
22,310
13,920
15,900
17,880
18,420
18,420
10,540
11,170
11,170
11,170
11,170
59
(15.0)
TC
25,360
24,690
23,940
23,260
18,810
11,390
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
14,730
16,600
18,580
20,560
22,430
14,380
16,250
18,230
20,210
22,080
13,920
15,900
17,880
19,860
21,730
13,690
15,550
17,530
19,510
21,380
11,590
13,450
15,430
17,420
18,810
8,320
10,300
11,390
11,390
11,390
63
(17.2)
TC
26,250
25,590
24,850
# 24,200
19,150
11,590
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,170
14,150
16,130
18,000
19,980
11,820
13,800
15,780
17,770
19,630
11,590
13,450
15,430
17,420
19,280
11,240
13,220
15,200
17,070
19,050
9,020
11,000
12,990
14,970
16,830
6,110
8,090
67
(19.4)
10,070
11,590
11,590
TC
27,080
26,430
25,700
25,100
19,420
11,740
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,490
11,470
13,450
15,320
17,300
9,260
11,120
13,220
15,080
17,070
8,910
10,890
12,870
14,730
16,720
8,670
6,460
8,440
3,780
5,760
7,740
9,720
11,590
71
10,650
12,640
14,500
16,480
(21.7)
10,420
12,290
14,270
TC
27,740
27,120
26,410
25,850
19,570
11,830
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
8,790
10,770
12,750
14,620
8,560
10,540
12,520
14,380
8,320
10,300
12,290
14,150
8,090
5,870
7,970
9,840
11,820
3,540
5,520
7,390
9,370
(23.9)
10,070
12,050
13,920
TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)
NOTE
1.
Rating conditions (#) : Indoor Unit Entering Air Temp. 80 °F (26.7 °C) D.B. / 67 °F (19.4 °C) W.B.
: Outdoor Ambient Temp. 95 °F (35 °C) D.B.
2.
Above data does not take Freeze Prevention Protection during cooling operation into account.
For this reason, the value may vary from the actual cooling characteristics.
3. Above data represents the value when the operation frequency of a compressor is fixed.
24
5-3. Cooling Capacity (Low Ambient)
Indoor Unit
: KHS1872
Outdoor Unit : CH1872
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY:
17,500 BTU/h
AIR FLOW RATE:
524 CFM
INDOOR
ENT. TEMP. oF (oC)
OUTDOOR
AMBIENT TEMP. oF (oC)
W.B.
D.B.
0
(-17.8)
15,050
5
15
25
35
45
55
(-15.0)
(-9.4)
(-3.9)
(1.7)
(7.2)
(12.8)
TC
15,040
15,010
15,140
15,200
15,260
15,230
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
11,790
13,520
15,050
15,050
15,050
11,790
13,520
15,040
15,040
15,040
11,790
13,520
15,010
15,010
15,010
11,890
13,620
15,140
15,140
15,140
11,890
13,620
15,200
15,200
15,200
11,890
13,620
15,260
15,260
15,260
11,890
13,620
15,230
15,230
15,230
59
(15.0)
TC
15,050
15,050
15,090
15,350
15,480
15,620
15,640
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,550
11,280
13,110
14,740
15,050
9,550
11,280
13,110
14,740
15,050
9,550
11,280
13,110
14,840
15,090
9,660
11,390
13,220
14,950
15,350
9,760
11,490
13,220
14,950
15,480
9,860
11,490
13,320
15,050
15,620
9,860
11,590
13,320
15,050
15,640
63
(17.2)
TC
14,890
14,920
15,040
15,460
15,680
15,910
16,000
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
7,210
8,940
7,210
8,940
7,320
9,050
7,520
9,150
7,520
9,250
7,620
9,350
7,720
9,450
67
(19.4)
10,780
12,500
14,230
10,780
12,500
14,230
10,880
12,500
14,230
10,980
12,710
14,440
11,080
12,810
14,540
11,180
12,910
14,640
11,180
12,910
14,640
TC
14,550
14,610
14,820
15,440
15,780
16,120
16,290
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
4,880
6,500
4,880
6,600
4,880
6,600
5,180
6,910
5,280
7,010
5,380
7,110
5,490
7,210
71
(21.7)
8,330
8,330
8,440
8,640
8,740
8,940
8,940
10,060
11,790
10,060
11,790
10,160
11,890
10,370
12,100
10,470
12,200
10,670
12,300
10,670
12,400
TC
14,050
14,130
14,450
15,300
15,760
16,210
16,470
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
4,260
5,990
7,720
9,450
4,260
6,100
7,830
9,450
4,370
6,200
7,930
9,550
4,670
6,400
8,130
9,860
4,770
6,600
8,330
10,060
4,880
6,710
8,440
10,160
4,980
6,810
8,540
10,270
(23.9)
TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)
NOTE
1.
Above data does not take Freeze Prevention Protection during cooling operation into account.
For this reason, the value may vary from the actual cooling characteristics.
2. Above data represents the value when the operation frequency of a compressor is fixed.
25
Indoor Unit
: KHS2472
Outdoor Unit : CH2472
Power Supply : 230V Single Phase 60Hz
< Cooling Capacity (Low Ambient) >
RATING CAPACITY:
24,200 BTU/h
AIR FLOW RATE:
600 CFM
INDOOR
ENT. TEMP. oF (oC)
OUTDOOR
AMBIENT TEMP. oF (oC)
W.B.
D.B.
0
(-17.8)
20,890
5
15
25
35
45
55
(-15.0)
(-9.4)
(-3.9)
(1.7)
(7.2)
(12.8)
TC
20,930
20,770
20,940
20,890
20,850
20,890
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
15,200
17,180
19,160
20,890
20,890
15,200
17,180
19,160
20,930
20,930
15,200
17,070
19,050
20,770
20,770
15,320
17,180
19,160
20,940
20,940
15,200
17,180
19,160
20,890
20,890
15,200
17,180
19,160
20,850
20,850
15,200
17,180
19,160
20,890
20,890
59
(15.0)
TC
20,710
20,780
20,760
21,120
21,130
21,160
21,310
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
12,400
14,380
16,370
18,230
20,210
12,400
14,380
16,370
18,350
20,210
12,400
14,380
16,370
18,230
20,210
12,640
14,500
16,480
18,470
20,330
12,640
14,500
16,600
18,470
20,330
12,640
14,500
16,600
18,470
20,450
12,750
14,620
16,600
18,580
20,450
63
(17.2)
TC
20,300
20,400
20,560
21,150
21,250
21,360
21,620
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
9,610
11,470
13,450
15,430
17,300
9,610
11,470
13,570
15,430
17,420
9,610
11,590
13,570
15,550
17,420
9,950
11,820
13,800
15,780
17,650
9,950
11,820
13,920
15,780
17,770
9,950
11,940
13,920
15,900
17,770
10,070
12,050
14,040
16,020
17,880
67
(19.4)
TC
19,590
19,740
20,120
21,010
21,200
21,410
21,820
72 (22.2) SHC
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
6,570
8,440
6,570
8,560
6,810
8,670
7,040
9,020
7,160
9,020
7,270
9,140
7,390
9,370
71
(21.7)
10,540
12,400
14,380
10,540
12,520
14,380
10,650
12,640
14,500
11,000
12,990
14,850
11,120
12,990
14,970
11,120
13,100
14,970
11,350
13,220
15,200
TC
18,650
18,840
19,490
20,700
20,980
21,310
21,860
75
76 (24.4) SHC
80 (26.7) SHC
84 (28.9) SHC
88 (31.1) SHC
5,640
7,620
9,610
11,470
5,640
7,740
9,610
11,590
5,870
7,860
9,840
11,700
6,340
8,320
6,460
8,440
6,460
8,560
6,690
8,670
(23.9)
10,190
12,170
10,300
12,290
10,420
12,400
10,650
12,520
TC : Total Cooling Capacity (BTU/h) SHC : Sensible Heat Capacity (BTU/h)
NOTE
1.
Above data does not take Freeze Prevention Protection during cooling operation into account.
For this reason, the value may vary from the actual cooling characteristics.
2. Above data represents the value when the operation frequency of a compressor is fixed.
26
5-4. Heating Capacity
Indoor Unit
: KHS1872
Outdoor Unit : CH1872
Power Supply : 230V Single Phase 60Hz
< Heating Capacity >
RATING CAPACITY:
20,400 BTU/h
AIR FLOW RATE:
541 CFM
OUTDOOR
ENT. TEMP. oF (oC)
INDOOR
AMBIENT TEMP. oF (oC)
W.B.
60
65
70
75
80
(15.6)
(18.3)
(21.1)
(23.9)
(26.7)
0 (-17.8)
3 (-16.1)
8 (-13.3)
13 (-10.6)
18 (-7.8)
23 (-5.0)
28 (-2.2)
33 (0.6)
38 (3.3)
43 (6.1)
48 (8.9)
53 (11.7)
58 (14.4)
63 (17.2)
65 (18.3)
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
11,320
11,700
12,620
13,570
14,610
15,710
16,850
18,030
19,200
20,440
21,700
22,970
24,190
25,450
25,930
11,320
11,700
12,610
13,560
14,610
15,700
16,840
18,020
19,190
20,430
21,680
22,940
24,160
25,410
25,900
11,310
11,690
12,600
13,550
14,590
15,690
16,830
18,000
19,170
20,400
21,650
22,910
24,120
25,360
25,850
11,290
11,680
12,590
13,530
14,570
15,660
16,800
17,970
19,130
20,360
21,600
22,860
24,060
25,300
25,780
11,270
11,650
12,560
13,510
14,540
15,630
16,760
17,930
19,090
20,310
21,550
22,790
23,990
25,220
25,700
#
TH : Total Heating Capacity (BTU/h)
NOTE
1.
Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) D.B.
: Outdoor Ambient Temp. 47 °F (8.3 °C) D.B. / 43 °F (6.1 °C) W.B.
2.
Above data does not take Defrost Operation, Overload Prevention Protection, and/or Cold Air
Prevention Protection during heating operation into account. For this reason, the value may vary
from the actual heating characteristics.
3. Above data represents the value when the operation frequency of a compressor is fixed.
27
Indoor Unit
: KHS2472
Outdoor Unit : CH2472
Power Supply : 230V Single Phase 60Hz
< Heating Capacity >
RATING CAPACITY:
29,000 BTU/h
AIR FLOW RATE:
653 CFM
OUTDOOR
ENT. TEMP. oF (oC)
INDOOR
AMBIENT TEMP. oF (oC)
W.B.
60
65
70
75
80
(15.6)
(18.3)
(21.1)
(23.9)
(26.7)
0 (-17.8)
3 (-16.1)
8 (-13.3)
13 (-10.6)
18 (-7.8)
23 (-5.0)
28 (-2.2)
33 (0.6)
38 (3.3)
43 (6.1)
48 (8.9)
53 (11.7)
58 (14.4)
63 (17.2)
65 (18.3)
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
TH
16,210
16,750
18,050
19,390
20,870
22,420
24,030
25,690
27,330
29,070
30,820
32,580
34,260
35,980
36,640
16,210
16,750
18,050
19,390
20,860
22,410
24,020
25,680
27,320
29,040
30,790
32,540
34,210
35,920
36,580
16,200
16,740
18,040
19,380
20,850
22,390
24,000
25,650
27,280
29,000
30,740
32,470
34,140
35,840
35,780
16,180
16,720
18,010
19,350
20,820
22,360
23,960
25,610
27,230
28,940
30,670
32,390
34,050
33,980
33,880
16,150
16,690
17,980
19,320
20,780
22,320
23,910
25,550
27,160
28,860
30,580
32,300
32,390
32,250
32,150
#
TH : Total Heating Capacity (BTU/h)
NOTE
1.
Rating conditions (#) : Indoor Unit Entering Air Temp. 70 °F (21.1 °C) D.B.
: Outdoor Ambient Temp. 47 °F (8.3 °C) D.B. / 43 °F (6.1 °C) W.B.
2.
Above data does not take Defrost Operation, Overload Prevention Protection, and/or Cold Air
Prevention Protection during heating operation into account. For this reason, the value may vary
from the actual heating characteristics.
3. Above data represents the value when the operation frequency of a compressor is fixed.
28
5-5. Air Throw Distance Charts
Indoor Unit
KHS1872
Room air temp. : 80°F (26.7°C)
Cooling
Fan speed
:
High
Horizontal distance (ft.)
10 15 20
0
0
5
25
30
5
10
15
: Flap angle 0 ,
: Flap angle 30 ,
: Axis air velocity 0
: Axis air velocity 30
Room air temp. : 70°F (21.1°C)
Heating
Fan speed
:
High
Horizontal distance (ft.)
10 15 20
0
0
5
25
30
5
10
15
: Flap angle 45 ,
: Flap angle 60 ,
: Axis air velocity 45
: Axis air velocity 60
29
Indoor Unit
KHS2472
Room air temp. : 80°F (26.7°C)
Cooling
Fan speed
:
High
Horizontal distance (ft.)
10 15 20
0
0
5
25
30
5
10
15
: Flap angle 0 ,
: Flap angle 30 ,
: Axis air velocity 0
: Axis air velocity 30
Room air temp. : 70°F (21.1°C)
Heating
Fan speed
:
High
Horizontal distance (ft.)
10 15 20
0
0
5
25
30
5
10
15
: Flap angle 45 ,
: Flap angle 60 ,
: Axis air velocity 45
: Axis air velocity 60
30
6. ELECTRICAL DATA
6-1. Electrical Characteristics
Indoor Unit
KHS1872
Outdoor Unit CH1872
(1) Voltage:230V
Cooling
<
230V >
Indoor Unit
Fan Motor
Outdoor Unit
Fan Motor + Compressor
230V Single-phase 60Hz
6.7
Complete Unit
Performance at
Rating conditions
Running amp.
Power input
A
0.3
32
7.0
W
1,468
1,500
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80°F (26.7°C) D.B. / 67°F (19.4°C) W.B.
95°F (35°C) D.B.
Heating
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
230V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.3
34
7.1
7.4
A
1,541
1,575
W
Rating conditions:
Indoor air temperature
Outdoor air temperature
70°F (21.1°C) D.B.
47°F (8.3°C) D.B. / 43°F (6.1°C) W.B.
(2) Voltage:208V
Cooling
<
208V >
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
208V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.3
32
7.4
7.7
A
1,468
1,500
W
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80°F (26.7°C) D.B. / 67°F (19.4°C) W.B.
95°F (35°C) D.B.
Heating
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
208V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.3
34
7.8
8.1
A
1,541
1,575
W
Rating conditions:
Indoor air temperature
Outdoor air temperature
70°F (21.1°C) D.B.
47°F (8.3°C) D.B. / 43°F (6.1°C) W.B.
31
Indoor Unit
KHS2472
Outdoor Unit CH2472
(1) Voltage:230V
Cooling
<
230V >
Indoor Unit
Fan Motor
Outdoor Unit
Fan Motor + Compressor
230V Single-phase 60Hz
10.3
Complete Unit
Performance at
Rating conditions
Running amp.
Power input
A
0.5
55
10.8
W
2,300
2,355
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80°F (26.7°C) D.B. / 67°F (19.4°C) W.B.
95°F (35°C) D.B.
Heating
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
230V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.5
58
11.5
12.0
A
2,432
2,490
W
Rating conditions:
Indoor air temperature
Outdoor air temperature
70°F (21.1°C) D.B.
47°F (8.3°C) D.B. / 43°F (6.1°C) W.B.
(2) Voltage:208V
Cooling
<
208V >
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
208V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.5
55
11.6
12.1
A
2,300
2,355
W
Rating conditions:
Indoor air temperature:
Outdoor air temperature:
80°F (26.7°C) D.B. / 67°F (19.4°C) W.B.
95°F (35°C) D.B.
Heating
Indoor Unit
Fan Motor
Outdoor Unit
Complete Unit
Fan Motor + Compressor
Performance at
208V Single-phase 60Hz
Rating conditions
Running amp.
Power input
0.5
58
13.0
13.5
A
2,432
2,490
W
Rating conditions:
Indoor air temperature
Outdoor air temperature
70°F (21.1°C) D.B.
47°F (8.3°C) D.B. / 43°F (6.1°C) W.B.
32
6-2. Electric Wiring Diagrams
Indoor Unit
KHS1872 KHS2472
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
WARNING
TERMINAL BASE
EVAPORATOR
1
2
3
BLK
WHT
RED
AC1 AC2 SI
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
RED
WHT
WHT
WHT
WHT
WHT
WHT
WHT
WHT
WHT
CONNECTOR
1 1
2 2
3 3
4 4
5 5
RED
1 1
2 2
3 3
4 4
5 5
PNK
BLU
BRN
YEL
FLAP
5P (WHT)
10P(
FLAP
LAMP
WHT
)
FLAP MOTOR
CONTROLLER
ROOM THERMISTOR
1 1
2 2
3 3
4 4
BLK
BLK
BLK
BLK
RED 1 1
2 2
BLK 3 3
WHT 4 4
YEL 5 5
BLU 6 6
ROOM/COIL
4P(
)
WHT
DCM
6P(BLU)
FM
COIL THERMISTOR
FAN MOTOR
1 1
2 2
3 3
ION
3P (
)
WHT
HA
JEM-A
4P (WHT)
1 2 3 4
1 2 3 4
1 2 3 4
ION
TERMINAL
ION ASSY
8FA2-5257-70500-0
33
Outdoor Unit CH1872
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
WARNING
REACTANCE
BLK
POWER RELAY
1
1
2
2
6
1
4
5
BLK
W
W
W
W
W
W
W
W
W
W
W
W
W
W
+
+
-
-
-
-
L1
L2 HIC HIC
BD BD
HIC HIC
AC2 AC2
A1 A2
FERRITE
CORE
TERMINAL
PLATE
E1
E
25A
1
2
3
4
5
6
W
W
W
ACIN1
ACIN2
SI-A
BLK
WHT
RED
W
U
CONTROLLER
GND
W
V
W
W
BLK
WHT
DCFM
COMP
A-TH
COIL/OUTDOOR
MV0
RV0 RV1
1
2
3
4
5
6
7
W
W
1
1
2
2
1
1
2
2
3
3
4
4
1
1
2
2
3
3
4
4
1
1
2
2
3
3
4
4
5
5
N
L
1
1
2
2
3
3
POWER
SUPPLY
1
1
2
2
3
3
4
4
5
5
6
6
7
7
HIGH PRESSURE
SWITCH
1
1
2
2
1
1
2
2
3
3
4
4
5
5
1
2
1
2
BLK
BLK
MVO
MAGNETIC COIL
2P-CONNECTOR (BLK)
S
R
T
RV
CM
FM
GRN/YEL
4WAY VALVE
COIL
OVERLOAD RELAY
(OLR)
COMPRESSOR
MOTOR
FAN MOTOR
1
2
1
2
WHT
WHT
WHT
WHT
2P-CONNECTOR (RED)
8FA2-5257-64000-2
34
Outdoor Unit CH2472
To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.
WARNING
REACTANCE
BLK
(
)
)
1P-CONNECTOR WHT
POWER RELAY
1
1
2
2
1
1
6
1
4
(
1P-CONNECTOR WHT
1
1
5
BLK
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
+
+
-
BD
-
BD
-
-
HEATER1 HEATER0 L1
L2 HIC HIC
HIC HIC
AC2 AC2 A1 A2
25A
FERRITE
CORE
TERMINAL
PLATE
E1
E
CRANKCASE
HEATER
1
2
3
4
5
6
W
ACIN1
ACIN2
SI-A
BLK
WHT
RED
W
U
W
W
CONTROLLER
GND
W
V
W
W
BLK
WHT
DCFM
COMP
A-TH
COIL/OUTDOOR
MV0
RV0 RV1
1
2
3
4
5
6
7
W
W
1
1
2
2
1
1
2
2
3
3
4
4
1
1
2
2
3
3
4
4
1
1
2
3
3
4
4
5
5
N
L
2
1
1
2
2
3
3
POWER
SUPPLY
1
1
2
2
3
3
4
4
5
5
6
6
7
7
HIGH PRESSURE
SWITCH
1
1
2
2
1
1
2
2
3
3
4
4
5
5
1
2
1
2
BLK
BLK
MVO
MAGNETIC COIL
2P-CONNECTOR (BLK)
V
U
W
RV
CM
FM
4WAY VALVE
COIL
OVERLOAD RELAY
(OLR)
COMPRESSOR
MOTOR
FAN MOTOR
1
2
1
2
WHT
WHT
WHT
WHT
2P-CONNECTOR (RED)
8FA2-5257-69200-3
35
Tab
7. MAINTENANCE
7-1. Address Setting of the Remote
Control Unit
The address can be set in order to prevent
interference between remote controllers when two
indoor units are installed near each other. The
address is normally set to "A." To set a different
address, it is necessary to change the address on the
second remote controller.
Fig. 13
NOTE
Once changed, you cannot restore the original
address setting of the air conditioner.
(1) Switch on the power source.
(2) Break the address-setting tab marked "A" on the
second remote controller to change the address
(Fig. 13). When the tab is removed, the adress is
automatically set to B (Fig. 14).
ACL button
Fig. 14
(3) Press and hold the remote controller ION button
and 1 HR TIMER button. Then, press and hold
the ACL (reset) button with a pointed object such
as the tip of a pen. After 5 seconds, release ACL
button first, then release ION and 1 HR TIMER
buttons, "oP-1" (test run) appears, blinking in the
remote controller clock display area.
(4) Each time the 1 HR TIMER button is pressed, the
display changes as shown below. Press this
button 2 times to change the display to "oP-7"
(address setting). (Fig. 15)
Test run mode
ON/OFF
operation
button
ION
button
Self-diagnostic mode
Address setting mode
1 HR.TIMER
button
(5) "oP-7" has now been selected for address setting.
(6) Press the ON/OFF operation button on the remote
controller. (Fig. 15) Check that the "beep"
signalreceived sound is heard from the second
indoor unit (approximately 5 times). The sound
you hear is the signal that the remote controller
address has been changed.
(7) Finally press the remote controller ACL (reset)
button to cancel the blinking "oP-7" display. (Fig.
15)
ACL (Reset)
button
Changing of the second remote controller address is
now completed.
Fig. 15
36
7-2. Disconnecting and Connecting Positive Connector for Outdoor Unit
One of the two types of connectors illustrated at left is used. Their
basic structure is the same for each.
How to Disconnect
Hold the resin connector cover, and pull the connector off.
You cannot disconnect the connector by pulling the wire since
it is locked inside. Always hold the cover to disconnect. (See
illustration at left.) For the connector without the resin cover,
push the lock in the direction of "2" while pulling it off.
Pull the cover upward
How to Connect
In order to connect, hold the resin cover of the connector and
push it in. Confirm the click sound for the inside lock.
When the cover is pulled upward, the lock is
released with the sequence of 1 and 2.
37
8. FUNCTIONS
8-1. Operation Functions
Emergency operation
SENSOR DRY
Emergency operation is available when the remote
controller malfunctions, has been lost, or otherwise
cannot be used.
During DRY operation, the system adjusts the room
temperature and fan speed according to the conditions in the
room, in order to maintain a comfortable room environment.
SENSOR DRY operation
To operate the system, press the OPERATION button,
which is also used as the receiver, below the unit display.
Each time this button is pressed, the OPERATION lamp
changes color to indicate the type of operation. Select the
desired type of operation.
•
DRY operation is as shown in the figure below.
Load
COOL zone
A zone
COOL
(GREEN)
HEAT
(RED)
STOP
(Lamp Off)
B zone
•
The set temperature is 4°F(2°C) below the detected room
temperature in the case of cooling operation, and 4°F(2°C)
above the room temperature in the case of heating
operation. The flap and fan speed settings are AUTO.
Conditions are monitored at all
times when the room temperature
is below 59°F(15°C).
DRY A
The compressor operation frequency varies.
The indoor fan operates with 1/f fluctuation.
AUTO cooling/heating operation
Selecting the operation mode
DRY B
•
•
When AUTO mode is selected, the microprocessor calculates
the difference between the set temperature and the room
temperature, and automatically switches to Cooling or
Heating mode.
The compressor operates at a low operating frequency.
The indoor fan operates with 1/f fluctuation.
Monitor
Room temp. Set temp.
Room temp. Set temp.
COOL
HEAT
•
•
Monitoring operation takes place when the room temperature
is below 59°F
temperature.
(15°C), or more than 5°F(3°C) below the set
As shown by the example in the figure below, with AUTO
cooling/heating operation, the mode changes between
Heating and Cooling mode according to changes in the
relationship between the current room temperature and the
set temperature.
When the monitoring range is entered, the compressor stops,
and the indoor fan operates with 1/f fluctuation.
NOTE
Example
PAM- control
Example of operation in AUTO mode with the set room temperature
at 74°F(23°C).
•
In order to further improve inverter performance, control is
switched between PWM control at low operation speeds, and
PAM control at high operation speeds, making the most
effective use of power.
Room temp.
Zone A
Zone B
Zone C
74
Set temp.
Zone C
Zone B
More than
1 hour
Within
1 hour
Zone A
Compressor
ON
ON
ON
OFF
OFF
Operation mode
Cooling
Heating
Cooling
38
HIGH POWER
NIGHT SETBACK
This function acts to raise the power but keeps the AC system in
the same operating mode.
This function is set with the HIGH POWER button on the remote
controller.
(It can be set regardless of the temperature and fan speed
settings.)
•
•
When NIGHT SETBACK operation is set, the temperature and
fan speed settings will be adjusted automatically to allow
comfortable sleep.
When NIGHT SETBACK operation is set, " mark" appears on
the remote controller. The main unit display lamp also becomes
dimmer.
HIGH POWER operation from remote controller
COOL and DRY modes
The unit operates at maximum output for 30 minutes,
regardless of the desired temperature.
The fan speed is 1 step above "High."
When the night setback mode is selected, the air conditioner
automatically raises the temperature setting 2°F(1°C) when 30
minutes have passed after the selection was made, and then
another 2°F(1°C) after another 30 minutes have passed,
regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing
comfort. This function is convenient when gentle cooling is
needed.
Frequency
MAX
2°F(1°C)
Setting
Time
0
temperature
2°F(1°C)
30 min.
5 min.
Press the NIGHT
SETBACK button
30 min.
30 min.
Start
End
Time
NOTE
•
•
When HIGH POWER operation ends, the unit operates at low
Hz for 5 minutes, regardless of the thermostat OFF conditions.
HEAT mode
When in DRY mode, operation is in the cooling zone.
When the night setback mode is selected, the air conditioner
automatically lowers the temperature setting 4°F(2°C) when 30
minutes have passed after the selection was made, and then
another 4°F(2°C) after another 30 minutes have passed,
regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing
comfort. This function is convenient when gentle heating is
needed.
Lamp colors
OPERATION lamp
HEAT operation
DRY operation
COOL operation
FAN operation
Red
Setting
temperature
4°F(2°C)
Orange
4°F(2°C)
Time
Green
Green
DEFROSTING operation
Red and Orange
alternately
Press the NIGHT
SETBACK button
30 min.
30 min.
TIMER lamp
QUIET lamp
ION lamp
Green
Green
Green
Timer backup
•
Operation stops if there are no operator controls for 25 hours or
longer after unit operation switched from OFF to ON by use of
ON timer operation.
39
8-2. Protective Functions
Overload prevention during heating
Cold-air prevention during heating
During HEAT operation, the temperature of the indoor heat
exchanger is used to control the frequency and lessen the load
on the compressor before the protective device is activated.
During heating, the fan speed is set to "LL" (very low) or stopped.
As the temperature of the indoor heat exchanger rises, the fan
speed is changed to the set speed.
Indoor heat exchanger
A. Control start
B. Control end
Set fan speed
Approx.
A
High
127
(53)
At stability of operation
Approx.
117
B
(47)
a
b
c
d
At start of operation
a. Area: Automatic capacity control
b. When Point A has been exceeded, the operation frequency is
reduced by a certain proportion.
LL
Stopped
77
(25) (30)
86
Approx. 104
(40)
c. Area: Frequency increase is prohibited.
d. At Point B and below, overload prevention is ended and
control is the same as in the
a
area.
Indoor heat exchanger
temperature °F(°C)
NOTE
•
•
•
The fan speed is forcibly changed to "LL" beginning 30 seconds
after the thermostat turns OFF.
Freeze prevention
At stability of operation refers to operation when the room
temperature has approached the set temperature.
During COOL or DRY operation, freezing is detected and
operation is stopped when the temperature of the indoor heat
exchanger matches the conditions below.
When HEAT operation starts, the indoor fan is stopped until the
temperature of the indoor heat exchanger reaches 68°F(20°C)
or higher, or until the room temperature reaches 59°F(15°C) or
higher.
1. Freeze-prevention operation is engaged when the
temperature of the indoor heat exchanger is below 43°F(6°C).
2. Restart after freeze-prevention operation occurs when the
temperature of the indoor heat exchanger reaches 46°F(8°C)
or above.
Compressor discharge temperature control
C
46
(8)
This function controls the operation frequency to prevent the
compressor discharge temperature from rising more than a
specified temperature.
A
B
43
(6)
Compressor discharge temperature °F(°C)
36
(2)
Approx.
A
*
214
(101)
a
b
c
d
Approx.
B
a. Area: Automatic capacity control
201
(94)
b. When the temperature drops below Point A, the operation
frequency is reduced by a certain proportion.
a
b
c
d
c. Area: Frequency increase is prohibited.
d. When the temperature reaches Point C or above, freezing
a. Area: Automatic capacity control.
prevention is ended and control is the same as in the
a
area.
b. When the temperature rises above Point A, the operation
frequency is reduced at a specified rate.
* When the temperature drops to below 36°F(2°C)
(continuously for 2 minutes or longer), the compressor stops.
Once the freeze condition is detected, the air conditioner will
work less than the maximum frequency until it is turned off.
c. Area: Further frequency increase is prohibited.
d. When the temperature falls below Point B, prevention of a rise
in frequency is released and the air conditioner operates as in
a
area.
* The compressor will stop if the temperature of the compressor
discharge exceeds 248°F(120°C) due to shortage of gas or
other reason.
40
Defrost detection and release
CT (Peak current cut-off control)
• This function prevents the circuit breaker or fuse from operating
to open the circuit. This function works when electrical current
has increased due to an increase in the cooling / heating load,
or to a decrease in the power supply voltage. In these cases,
operation frequency is reduced or operation is interrupted auto-
matically to control the electrical current for operation.
Reverse-Cycle Defrosting
Defrosting Sequence
•
When the cause of the increase in electrical current is rectified,
the system will resume operation in the original mode.
Heating operation
(A)
Heating
<
KHS1872
>
Outdoor fan ON
4-way valve ON
Cooling Dry
22.5
Peak current cut-off trips
Hz down
14.0
15.0
Frost sensing
(A)
<
KHS2472>
Cooling Dry
Heating
Defrost detection occurs in either of the following cases:
Peak current cut-off trips
Hz down
22.5
•
The temperature of the heat exchanger remains at
or below the L1 line for 3 minutes after the start of
HEAT operation.
14.0
17.5
• The temperature of the heat exchanger remains at
or below the L2 line for 120 minutes after the start
of HEAT operation.
Electrical current setting for COOL operation is
used during DEFROST operation.
NOTE
Outdoor heat
exchanger temp.
0
Ambient temp.
L2
L1
Frosting area
Reverse-cycle defrosting operation
Compressor 1 minute after it is stopped,
compressor is ON.
Outdoor fan OFF
Indoor fan OFF
4-way valve OFF
Operation lamp
Repeatedly switches between red
and orange illumination.
Releasing of defrosting
Outdoor heating exchanger temp. is over 57.2°F (14°C).
Defrosting operation lasts 12 minutes (maximum).
2 minutes after it is stopped, compressor is ON.
4-way valve is ON. Outdoor fan is ON.
NOTE
If the air conditioner is turned off during the defrosting
cycle, it will continue defrosting and turn itself off after
defrosting is completed.
41
9. TROUBLESHOOTING
9-1. Precautions before Performing Inspection or Repair
After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair.
High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge
(charging voltage DC 310V) even after the power is turned OFF, and some time is required for the charge to dissipate. Be
careful not to touch any electrified parts before the controller LED (red) turns OFF.
If the outdoor controller is normal, approximately 30 seconds will be required for the charge to dissipate. However, allow
at least 5 minutes for the charge to dissipate if there is thought to be any trouble with the outdoor controller.
9-2. Method of Self-Diagnostics
< Clock display >
Follow the procedure below to perform detailed trouble diagnostics.
Test run mode
Self-diagnostics mode
NOTE
1:If the operation lamp blinks every 0.5 seconds immediately when the
power is turned ON, there is an external ROM (OTP data) failure on the
indoor circuit board, or a ROM socket insertion problem, or the ROM
has not been installed.
2:The failure mode is stored in memory even when the power is not ON.
Follow the procedure below to perform diagnostics.
ON/OFF
operation
button
PROCEDURE
After turning on power to the air conditioner, use the remote controller and
follow the steps below to execute self-diagnostics.
ION
button
Step 1: Press and hold the remote controller ION button and 1 HR TIMER
button. Then, press and hold the ACL (reset) button with a pointed
object such as the tip of a pen. After 5 seconds, release ACL
button first, then release ION and 1 HR TIMER buttons, "oP-1"
(test run) appears, blinking in the remote controller clock display
area.
1HR.
TIMER
button
Step 2: Next, press the 1 HR TIMER button once to change the display
from "oP-1" to "oP-3" (self-diagnostics). (The display continues to
blink.)
Step 3: Finally press the ON/OFF button to engage self-diagnostics mode.
• The self-diagnostics function utilizes the 3 indicator lamps on the main
unit, in combinations of ON lamps, blinking lamps, and OFF lamps, to
report the existence of sensor trouble or a protective operation. (The
lamps blink or remain ON for 5 seconds, then turn OFF for 2 seconds.)
Self-diagnostics is completed when the buzzer sounds 3 short beeps.
• A maximum of 3 self-diagnostics reports are displayed, for 5 seconds
each, beginning with the most recent report. Following this display the
lamps turn OFF. In order to view the self-diagnostics results again,
press the ON/OFF button again.
ACL
(Reset)
button
• The 3 lamps remain OFF if no trouble has occurred.
<IMPORTANT> After self-diagnostics is completed, be sure to press the
ACL (reset) button to return to normal mode. The air
conditioner will not operate if this is not done.
42
(1) Self-diagnostics Lamps
INDOOR UNIT
(1) OPERATION lamp
(2) TIMER lamp
(3) QUIET lamp
ION lamp
OPERATION button
REMOTE CONTROL receiver
Since the indications cover various units, the corresponding parts listed below may not be present in some models.
.... .... ....
Indication on indoor unit
OFF
Blinking
ON (Illuminated)
Quiet
(3)
Timer
(2)
Operation
(1)
Code
S01
S02
S03
Diagnostics items
Room temperature sensor failure
Indoor heat exchanger sensor failure
Humidity sensor failure
Diagnostics contents
(1) Sensor open circuit or short circuit
(2) Contact failure at connector or open circuit at terminal crimping location
(short-circuit detection only for the humidity sensor)
(3) Indoor/outdoor PCboard failure
Compressor temperature sensor failure
S04
S05
(1) Sensor open circuit or short circuit
(2) Contact failure at connector or open circuit at terminal crimping location
(3) Outdoor PCboard failure
Outdoor heat exchanger sensor failure
Outdoor air temperature sensor failure
S06
S07
Outdoor electrical current detection
failure
Outdoor PCboard failure
(1) Mis-wiring (2) AC power failure (3) Blown fuse (4) Power Relay failure
(5) Indoor or outdoor PCboard failure (6) Outdoor Fan Motor failure (7) Reactor failure
(8) High-Pressure Switch failure (9) Overload Relay failure (10) Magnetic Coil failure
* See detailed flowchart in this section.
Indoor/outdoor communications failure
(serial communications)
E01
E02
(1) HIC or power Tr failure (2) Outdoor fan does not turn. (3) Instantaneous power outage
(4) Service valve not opened. (5) Outdoor fan blocked. (6) Continuous overload operation
(7) Compressor failure (8) Outdoor PCboard failure
• HIC circuit failure
• Power Tr (transistor) circuit failure
Outdoor unit external ROM (OTP data)
failure
(1) External ROM data failure (2) Outdoor PCboard failure
E03
E04
E05
(1) Instantaneous power outage (2) HIC or power transistor failure
(3) Outdoor PCboard failure
Peak current cut-off
PAM circuit failure
Active circuit failure
(1) Outdoor PCboard failure (2) Outdoor power supply voltage failure
Compressor discharge overheat
prevention activated.
(1) Electric expansion valve failure (2) Capillaries choked (3) Shortage of refrigerant
E06
E07
(4) Continuous overload operation (5) Outdoor fan does not rotate (6) Outdoor PCboard failure
Indoor fan operating failure
(1) Fan motor failure (2) Contact failure at connector (3) Indoor PCboard failure
4-way valve switching failure
Indoor zero-cross failure
(1) 4-way valve failure (heat pump model only)
(2) Outdoor PCboard failure
E08
E09
E10
E11
No-refrigerant protection
(1) Service valve not opened. (2) Shortage of refrigerant
(1) Open phase (2) Outdoor PCboard failure
DC compressor drive circuit failure
Outdoor fan operating failure
(1) Fan motor failure (2) Contact failure at connector (3) Outdoor PCboard failure
Outdoor system communications failure
OLR operation
Outdoor power supply open phase
Outdoor coil freezing
(1) Mis-wiring (2) Blown fuse (3) Power Relay failure (4) Outdoor PCboard failure
(5) Compressor failure
E12
E13
* See detailed flowchart in this section.
Freeze-prevention operation activated.
(1) Indoor fan system failure (2) Shortage of refrigerant (3) Low-temperature operation
43
(2) If the self-diagnostics function fails to operate
Check the indoor unit.
No indicators illuminate and the
indoor fan does not rotate.
Check the power voltage.
Blown
Is the fuse blown?
Normal
Replace the circuit
board or the fuse.
Replace the controller.
44
9-3. Checking the Indoor and Outdoor Units
(1) Checking the indoor unit
No.
Control
Check items (unit operation)
• The rated voltage must be present between inter-unit wirings 1 and 2.
1
Use the remote controller to operate the
unit in "TEST run" mode. To determine
whether the mode is currently in
"TEST run" mode, check the 4 indicator
lamps on the unit. If all 4 are blinking,
the current mode is "TEST run."
•
Connect a 5 k ohm resistor between inter-unit wirings 2 and 3. When the
voltage at both ends is measured, approximately 12 to 15V DC must
be output and the multimeter pointer must bounce once every 8
seconds.
Or instead of measuring the voltage, you can insert an LED jig and
check that the LED flickers once every 8 seconds.
If there are no problems with the above, then check the outdoor unit.
For the "Test run" procedure, refer to the Appendix B "Installation Instructions".
(2) Checking the outdoor unit
No.
Control
Check items (unit operation)
1
Apply the rated voltage between outdoor
unit terminals L and N.
• The control panel LED (red) must illuminate.
2
Short-circuit the outdoor unit COM terminal
to the T-RUN terminal.
• The compressor, fan motor and 4-way valve must all turn on.
If there are no problems with the above, then check the indoor unit.
TEST/T-RUN terminals
Using the TEST/T-RUN terminals
T-RUN
: Test run (compressor and fan motor turn ON).
TEST/MV : Compresses time to 1/60th (accelerates
operation by 60 times faster than normal).
(TEST)/MV T-RUN COM
45
(3) Serial Communication Error Identification Procedure
If the lamps on the main body show the following conditions after the completion of self-diagnostics,
a communication error between the indoor unit and outdoor unit might be considered.
In such a case, identify the breakdown section by using the following procedure.
NOTE Refer to "Method of Self-Diagnostics" for the self-diagnostics procedure.
Lamp
Condition
Quiet
Timer
(2)
Operation
(1)
: Off
: Blinking
: Illuminated
(3)
E01
E12
< Before the Operation >
For terminal strip short circuit work or inter-unit wiring removal, turn off the power to
avoid an electric shock.
WARNING
Release the terminal strip short circuit after the completion of self-diagnostics.
Do not perform the short-circuit work between any other terminals except for
specified ones on the specified terminal strip. If such work is performed between
the incorrect terminals, the unit might be broken.
CAUTION
< Convenient Tool for Short-Circuit Work ( for example ) >
Cable
Alligator Clip
Alligator Clip
< Check Items before Troubleshooting Serial Communication Start >
After confirming that the following errors do not exist, start the "Troubleshooting Serial Communication"
in "Condition: E01 and E12".
1. Mis -wiring (inter-unit cable, etc.)
2. AC power failure
6. Reactor failure (defective insulation, etc.)
7. High-Pressure Switch failure
3. Blown fuse
8. Overload Relay failure
4. Power Relay failure
9. Magnetic Coil failure (defective insulation, short-circuit, etc.)
10. Compressor failure (defective insulation, etc.)
5. Outdoor Fan Motor failure (defective insulation, etc.)
(3-1) Condition: E01
-
+
Outdoor Unit
V
1
2
3
3
4
5
6
Outdoor Unit
Troubleshooting Serial Communication
1
1
2
3
4
5
6
Power
1
2
Power
Indoor Unit
2
3
V
Indoor Unit
+
-
Fig. 2
Fig. 1
1. Turn OFF the power and wait until the power lamp (LED)
of the outdoor unit controller is turned OFF.
2. Disconnect the cable from the terminal 3 on the indoor unit
Is the voltage of about DC12V
or more given between the terminals
2 and 3 on the outdoor unit terminal strip
(Serial Communication Line) ?
(Fig. 1)
No
terminal strip.
3. Turn ON the power.
(Fig. 2)
Yes
A
( Continued to the next page A. )
B
( Continued to the next page B. )
46
( Continued from the previous page A. )
A
( Continued from the previous page B. )
B
Is the voltage of about DC22V to
24V given between the terminals
2 and 3 on the indoor unit terminal strip
(Serial Communication Line) ?
(Fig. 2)
Yes
No
Defect in the indoor unit
P.C. board
Defect or connection error
in the inter-unit cable
Outdoor Unit
1. Turn OFF the power and wait until the power lamp (LED)
of the outdoor unit controller is turned OFF.
2. Short-circuit between the terminals 2 and 3 on the outdoor
1
1
2
2
3
3
4
5
6
Power
unit terminal strip.
(Fig. 3)
Indoor Unit
Fig. 3
1. Turn ON the power and operate the system using the
remote controller or the operation button on the indoor unit.
2. Perform the self-diagnosis five seconds after the operation
start.
Condition: E12
Defect in the outdoor unit
P.C. board.
What is the latest self-diagnosis result ?
Condition: E01
Outdoor Unit
Outdoor Unit
1. Turn off the power and wait until the power lamp (LED)
of the outdoor unit controller is turned OFF.
2. Remove the short-circuit between the terminals 2 and 3 on
the outdoor unit terminal strip.
3. Disconnect the cable from the terminal 3 on the indoor unit
1
1
2
3
3
4
5
6
1
2
2
3
4
5
6
Power
Power
2
terminal strip.
(Fig. 4)
1
3
Indoor Unit
Indoor Unit
Fig. 5
Fig. 4
Short-circuit between the terminals 2 and 3 on the indoor unit
terminal board. (Fig. 5)
1. Turn ON the power and operate the system using the
remote controller or the operation button on the indoor unit.
2. Perform the self-diagnosis five seconds after the operation
start.
Condition: E12
Defect or connection error
in the inter-unit cable
What is the latest self-diagnosis result ?
Condition: E01
Defect in the indoor unit
P.C. board
47
(3-2) Condition: E12
Troubleshooting Serial Communication
Outdoor Unit
1
1
2
2
3
3
4
5
6
Power
1. Turn off the power and wait until the power lamp (LED)
of the outdoor unit controller is turned OFF.
2. Disconnect the cable from the terminal 3 on the Outdoor
Indoor Unit
unit terminal strip.
(Fig. 6)
Fig. 6
1. Turn ON the power and operate the system using the
remote controller or the operation button on the indoor unit.
2. Perform the self-diagnosis five seconds after the operation
start.
Condition: E01
Defect in the outdoor unit
P.C. board
What is the latest self-diagnosis result ?
Condition: E12
Outdoor Unit
1
1
2
3
3
4
5
6
1. Turn off the power and wait until the power lamp (LED)
of the outdoor unit controller is turned OFF.
2. Disconnect the cable from the terminal 3 on the indoor
Power
2
unit terminal strip.
(Fig. 7)
Indoor Unit
Fig. 7
1. Turn ON the power and operate the system using the
remote controller or the operation button on the indoor unit.
2. Perform the self-diagnosis five seconds after the operation
start.
Condition: E01
Defect in the inter-unit
cable
What is the latest self-diagnosis result ?
Condition: E12
Defect in the indoor unit
P.C. board
48
9-4. Trouble Diagnosis of Fan Motor
9-4-1. Indoor Fan Motor
This indoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil
resistance, and the following procedure should be used to check the motor.
To perform diagnosis, operate the unit in cooling mode with indoor fan speed "High". Next, make sure that the
indoor unit receive the signals from the remote controller when the ON/OFF operation button is pressed.
Important:
(A) Turn OFF the power before connecting or disconnecting the motor connectors.
(B) When performing voltage measurement at the indoor controller connector for (3) in the table
below, the DC motor will trip and voltage output will stop approximately 1 minute after operation
is started. For this reason, to measure the voltage again, turn OFF the unit once using the
remote controller, and then start the air conditioner again.
[Trouble symptom 1] The fan does not stop when the unit stops. Indoor unit controller trouble.
[Trouble symptom 2] The fan motor does not rotate when the unit is operating.
(Diagnostic procedure)
* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the indoor
unit controller (3 locations).
Measurement location
Normal value
DC 230 V or more
(1) Vm-Gnd: Between pin 1 and pin 3
(2) Vcc-Gnd: Between pin 4 and pin 3
(3) Vs-Gnd: Between pin 5 and pin 3
DC 14 V or more
Fluctuation between DC 1.7 to 6.1 V
(Diagnostic results)
All of the above measured values are normal. Fan motor trouble (Replace the motor.)
Any one of the above measured values is not normal. Indoor unit controller trouble (Replace the controller .)
(Reference)
DC motor connector pin arrangement
Pin 1: Vm (red)
Pin 2: Not used
Pin 3: Gnd (black)
Pin 4: Vcc (white)
Pin 5: Vs (yellow)
Pin 6: PG (blue)
[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the indoor
unit operates.
(There is trouble in the system that provides feedback of motor rotation speed from the
motor to the indoor unit controller.)
[Trouble symptom 4] Fan motor rotation speed does not change during indoor unit operation.
[Trouble symptom 5] Fan motor rotation speed varies excessively during indoor unit operation.
(Remedy for symptom 3 to 5)
It is not possible to identify whether the trouble is indoor unit controller trouble or motor trouble.
Therefore, first replace the indoor unit controller, then (if necessary) replace the DC motor.
49
9-4-2. Outdoor Fan Motor
This outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil
resistance, and the following procedure should be used to check the motor.
Perform the trouble diagnosis by Test Run mode described on Installation Instructions.
Important:
(A) Turn OFF the power before connecting or disconnecting the motor connectors.
(B) When performing voltage measurement at the outdoor controller connector for (3) in the table
below, the DC motor will trip and voltage output will stop approximately 10 seconds after
operation is started. For this reason, to measure the voltage again, first turn OFF the outdoor
unit power, then, measure the voltage in Test Run mode.
[Trouble symptom 1] The fan does not stop when the outdoor unit stops. Outdoor unit controller trouble
[Trouble symptom 2] The fan motor does not rotate when the outdoor unit is operating.
(Diagnostic procedure)
* Disconnect the motor connectors and measure the voltage at the DC motor connectors on the outdoor
unit controller (3 locations).
Measurement location
(1) Vs-Gnd : Between pin 1 and pin 4
or
Normal value
DC 230V or more
DC 14V or more
Vm-Gnd : Between pin 1 and pin 4
(2) Vcc-Gnd : Between pin 5 and pin 4
(3) Vsp-Gnd : Between pin 7 and pin 4
After fluctuating 4 times between DC 1.7 to 6.1V
(1 sec. ON) and DC 0 V (1 sec. OFF), the DC
motor trips.
(Diagnostic results)
All of the above measured values are normal. Fan motor trouble (Replace the motor.)
Any one of the above measured values is not normal. Outdoor unit controller trouble
(Replace the controller .)
(Reference)
DC motor connector pin arrangement
CH1872
CH2472
Pin 1: Vs (white)
Pin 2: Not used
Pin 3: Not used
Pin 4: Gnd (black)
Pin 5: Vcc (red)
Pin 6: FG (blue)
Pin 7: Vsp (yellow)
Pin 1: Vm (red)
Pin 2: Not used
Pin 3: Not used
Pin 4: Gnd (blue)
Pin 5: Vcc (brown)
Pin 6: PG (white)
Pin 7: Vsp (orange)
[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the outdoor
unit operates.
(There is trouble in the system that provides feedback of motor rotation speed from the
motor to the outdoor unit controller.)
[Trouble symptom 4] Fan motor rotation speed does not change during outdoor unit operation.
[Trouble symptom 5] Fan motor rotation speed varies excessively during outdoor unit operation.
(Remedy for symptom 3 to 5)
It is not possible to identify whether the trouble is outdoor unit controller trouble or motor trouble.
Therefore, first replace the outdoor unit controller, then (if necessary) replace the DC motor.
50
9-5. Noise Malfunction and Electromagnetic Interference
An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external
noise, and is likely to cause electromagnetic interference with nearby wireless devices.
A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these
effects may still occur. Please pay attention to the points listed below.
(1) Noise malfunction
This refers to the application of high-frequency noise to the signal wires, resulting in abnormal signal pulses and malfunction.
Locations most susceptible to noise
Trouble
Correction
1. Locations near broadcast stations where
there are strong electromagnetic waves
Either of the following trouble may occur.
(The fundamental concept is to make the
system less susceptible to noise.)
1. The unit may stop suddenly during
operation.
2. Locations near amateur radio (short wave)
stations
- Insulate for noise or
distance from the noise source. -
2. Indicator lamps may flicker.
3. Locations near electronic sewing machines
and arc-welding machines
1. Use shielded wires.
2. Move unit away from the noise source.
(2) Electromagnetic interference
This refers to noise generated by high-speed switching of the microcomputer and compressor. This noise radiates through
space and returns to the electric wiring, affecting any wireless devices (televisions, radios, etc.) located nearby.
Locations most susceptible to noise
Trouble
Correction
1. A television or radio is located near the
A/C and A/C wiring.
1. Noise appears in the television picture, 1. Select a separate power source.
or the picture is distorted.
2. Keep the A/C and A/C wiring at least 1 meter
away from wireless devices and antenna cables.
2. The antenna cable for a television or
radio is located close to the A/C and A/C
wiring.
2. Static occurs in the radio sound.
3. Change the wireless device’s antenna to a high-
sensitivity antenna.
3. Locations where television and radio
signals are weak.
4. Change the antenna cable to a BS coaxial cable.
5. Use a noise filter (for the wireless device).
6. Use a signal booster.
51
10. CHECKING ELECTRICAL COMPONENTS
10-1. Measurement of Insulation
Resistance
Ground wire
Clip
The insulation is in good condition if the resistance
exceeds 1M ohm.
Probe
10-1-1. Power Supply Cord
Insulation
tester
Clamp the grounding wire of power cord with the lead
Fig. 1
clip of the insulation resistance tester and measure the
resistance by placing a probe on either of the two
power wires. (Fig. 1)
Terminal plate
Then also measure the resistance between the
grounding and other power terminals. (Fig. 1)
Probe
10-1-2. Indoor Unit
Clamp an aluminum plate fin or copper tube with the
lead clip of the insulation resistance tester and
measure the resistance by placing a probe on each
terminal screw on the terminal plate. (Fig. 2)
Note that the ground line terminal should be skipped
for the check.
Clip
Copper
tube or
metallic part
Insulation
tester
10-1-3. Outdoor Unit
Fig. 2
Clamp a metallic part of the unit with the lead clip of
the insulation resistance tester and measure the
resistance by placing a probe on each terminal screw
where power supply lines are connected on the
terminal plate. (Fig. 2)
Probe
Clip
10-1-4. Measurement of Insulation
Resistance for Electrical Parts
Copper
tube or
metallic part
Disconnect the lead wires of the desired electric part
from terminal plate, capacitor, etc. Similarly disconnect
the connector. Then measure the insulation resistance.
(Figs. 3 and 4)
Insulation
tester
Fig. 3
NOTE
From fan motor,
compressor and
other parts
Refer to Electric Wiring Diagram.
If the probe cannot enter the poles because the hole is
too narrow then use a probe with a thinner pin.
Probe
Metallic
part
Clip
Insulation
tester
Fig. 4
52
10-2. Checking Continuity of Fuse
on PCB Ass'y
Fuse
Remove the PCB Ass'y from the electrical
component box. Then pull out the fuse from the PCB
Ass'y. (Fig. 5)
Check for continuity using a multimeter as shown in
Fig. 6.
PCB Ass'y
Fig. 5
Fuse
Fig. 6
53
11. REFRIGERANT R410A:
SPECIAL PRECAUTIONS WHEN SERVICING UNIT
11-1. Characteristics of New Refrigerant R410A
11-1-1. What is New Refrigerant R410A?
R410A is a new refrigerant that contains two types of pseudo-non-azeotropic refrigerant mixture. Its
refrigeration capacity and energy efficiency are about the same level as the conventional refrigerant, R22.
11-1-2. Components (mixing proportions)
HFC32 (50%) / HFC125 (50%)
11-1-3. Characteristics
Less toxic, more chemically stable refrigerant
The composition of refrigerant R410A changes whether it is in a gaseous phase or liquid phase. Thus, when
there is a refrigerant leak the basic performance of the air conditioner may be degraded because of a change in
composition of the remaining refrigerant. Therefore, do not add new refrigerant. Instead, recover the
remaining refrigerant with the refrigerant recovery unit. Then, after evacuation, totally recharge the specified
amount of refrigerant with the new refrigerant at its normal mixed composition state (in liquid phase).
When refrigerant R410A is used, the composition will differ depending on whether it is in gaseous or liquid
phase, and the basic performance of the air conditioner will be degraded if it is charged while the refrigerant is in
gaseous state. Thus, always charge the refrigerant while it is in liquid phase.
Ether-type oil is used for compressor oil for R410A-type units, which is different
CAUTION
from the mineral oil used for R22. Thus more attention to moisture prevention and
faster replacement work compared with conventional models are required.
54
11-2. Checklist before Servicing
Use a clutch-type flare tool for R410A or the conventional flare tool. Note that sizes of the resultant flares differ
between these two tools. Where a conventional flare tool is used, make sure to observe A Specification (amount of
extrusion) by using the flare spacer.
Specification A
Diameter of tube D
Flare tool for R410A
Conventional flare tool (for R22)
Dia.1/4" (6.35 mm)
Dia.3/8" (9.52 mm)
Dia.1/2" (12.7 mm)
Dia.5/8" (15.88 mm)
0 to 0.0196"
0.0472"
(0 to 0.5 mm)
(1.2 mm)
Size of flare
Spacer
D
D
A
A
Flare tool for R410A
Conventional flare tool (R22)
Tubing precautions
Refrigerant R410A is more easily affected by dust or moisture compared with R22, thus be sure to temporarily
cover the ends of the tubing with caps or tape prior to installation.
Never use 0.0276" (0.7 mm)-thick copper tubing or tubing which is less than 0.0315" (0.8 mm) in thickness, since
air conditioners with R410A are subject to higher pressure than those using R22 and R407C.
No addition of compressor oil for R410A
No additional charge of compressor oil is permitted.
No use of refrigerant other than R410A
Never use a refrigerant other than R410A.
If refrigerant R410A is exposed to fire
Through welding, etc., toxic gas may be released when R410A refrigerant is exposed to fire. Therefore, be sure
to provide ample ventilation during installation work.
Caution in case of R410A leak
Check for possible leak points with the special leak detector for R410A. If a leak occurs inside the room,
immediately provide thorough ventilation.
55
11-3. Tools Specifically for R410A
For servicing, use the following tools for R410A
Tool Distinction
Gauge manifold
Tool Name
Charging hose
Gas leak detector
Refrigerant cylinder
Charging cylinder
Refrigerant recovery unit
Vacuum pump with anti-reverse flow (*1)
(Solenoid valve-installed type, which prevents oil from flowing back into the
unit when the power is off, is recommended.)
Vacuum pump (*2)...can be used if the following adapter is attached.
Vacuum pump adapter (reverse-flow prevention adapter) (*3).
(Solenoid valve-installed adapter attached to a conventional vacuum pump.)
Electronic scale for charging refrigerant
Flare tool
Tools specifically for R410A
Bender
Tools which can be com-
monly used for R22,
R407C, and R410A
Torque wrench
Cutter, reamer
Welding tool, nitrogen gas cylinder
The above tools specifically for R410A must not be used for R22 and R407C.
Doing so will cause malfunction of the unit.
CAUTION
For the above vacuum pump (*1, *2) and vacuum pump adapter (*3), those for
R22-type units can be used for R410A-type. However, they must be used
exclusively for R410A and never alternately with R22 and R407C.
To prevent other refrigerants (R22, R407C) from being mistakenly charged to this unit, shape and external
diameter of the service port screw has been altered.
<External diameter of service port> R410A : 5/16"
R22, R407C : 1/4"
11-4. Tubing Installation Procedures
When the tubes are connected, always apply HAB oil on the flare portions to improve the sealing of tubing.
The following is the HAB oil generally used:
Esso: ZERICE S32
NOTE
For details on tubing installation procedures, refer to the installation manuals attached to the indoor
unit and outdoor unit.
56
11-5. In Case of Compressor Malfunction
Should the compressor malfunction, be sure to make the switch to a replacement
CAUTION
compressor as quickly as possible.
Use only the tools indicated exclusively for R410A. See "11-3. Tools
Specifically for R410A."
11-5-1. Procedure for Replacing Compressor
(1) Recovering refrigerant
Any remaining refrigerant inside the unit should not be
released to the atmosphere, but recovered using the
refrigerant recovery unit for R410A.
(1) Recover refrigerant
OK
Do not reuse the recovered refrigerant, since it will contain
impurities.
(2) Replacing Compressor
(2) Replace compressor
OK
Soon after removing seals of both discharge and suction
tubes of the new compressor, replace it quickly.
(3) Checking for sealing
Use nitrogen gas for the pressurized gas, and never use a
refrigerant other than R410A. Also do not use oxygen or
any flammable gas.
(3) Check for sealing
OK
(4) Evacuation
Use a solenoid valve-installed vacuum pump so that
even if power is cut off in the middle of evacuation of air
due to a power interruption, the valve will prevent the
pump oil from flowing back.
(4) Evacuation
OK
The equipment may be damaged if moisture remains in
the tubing, thus carry out the evacuation thoroughly.
When using a vacuum pump with exhaust air volume more
than 0.883 cu.ft./min. and ultimate vacuum pressure rate
of 50 micron Hg.
(5) Recharge
Standard time for evacuation
Length of tubing
Less than 33 ft. (10 m)
More than 33 ft. (10 m)
Evacuation time
More than 10 minutes
More than 15 minutes
57
(5) Recharging
Be sure to charge the specified amount of
Configuration and characteristics of cylinders
Valve
refrigerant in liquid state using the service port
of the wide tube service valve. The proper
amount is listed on the unit's nameplate.
When the entire amount cannot be charged all at
once, charge gradually while operating the unit in
Cooling Operation.
Liquid
Never charge a large amount
CAUTION
of liquid refrigerant at once to
the unit. This may cause
damage to the compressor.
Single valve
Charge liquid refrigerant with
cylinder in up-side-down position.
When charging with a refrigerant cylinder, use an
electronic scale for charging refrigerant. In this
case, if the volume of refrigerant in the cylinder
becomes less than 20% of the fully-charged
amount, the composition of the refrigerant starts
to change. Thus, do not use the refrigerant if
the amount in the charging cylinder is less
than 20%.
Fig. 1
Valve
Also, charge the minimum necessary amount to
the charging cylinder before using it to charge
the air conditioning unit.
Example:
Liquid
In case of charging refrigerant to a unit requiring
1.68 lb. (0.76 Kg) using a capacity of a 22 lb. (10
Kg) cylinder, the minimum necessary amount for
the cylinder is:
Single valve (with siphon tube)
Charge with cylinder in normal position.
1.68 + 22 0.20 = 6.08 lb.
(0.76 + 10 0.20 = 2.76 Kg)
Fig. 2
For the remaining refrigerant, refer to the
instructions of the refrigerant manufacturer.
NO!
If using a charging cylinder, transfer the specified
amount of liquid refrigerant from the refrigerant
cylinder to the charging cylinder.
Charging
cylinder
Prepare an evacuated charging cylinder
beforehand.
To prevent the composition
CAUTION
of R410A from changing,
never bleed the refrigerant
gas into the atmosphere
while transferring the
refrigerant. (Fig. 3)
Liquid
Open
Refrigerant
cylinder
Do not use the refrigerant if the amount in the
charging cylinder is less than 20%.
Fig. 3
58
11-6. In Case Refrigerant is Leaking
Never attempt to charge additional refrigerant when refrigerant has been leaking
CAUTION
from the unit. Follow the procedure described below to locate points of leaks and
carry out repairs, then recharge the refrigerant.
(1) Detecting Leaks
Use the detector for R410A to locate refrigerant leak
points.
(1) Detect leaks
(2) Recovering refrigerant
Never release the gas to the atmosphere; recover
OK
residual refrigerant using the refrigerant recovery unit for
R410A, instead.
(2) Recover refrigerant
Do not reuse the recovered refrigerant because its
composition will have been altered.
OK
(3) Welding leaking points
Confirm again that no residual refrigerant exists in the unit
before starting welding.
(3) Weld leaking points
OK
Weld securely using flux and wax for R410A.
Prevent oxide film from forming inside the tubes utilizing
substitution with nitrogen (N2) in the refrigerant circuit of
the unit. Leave ends of tubes open during welding.
(4) Checking for sealing
(4) Check for sealing
OK
Use nitrogen gas for the pressurized gas, and never use
a refrigerant other than R410A. Also do not use oxygen or
any flammable gas.
(5) Evacuation
(5) Evacuation
OK
Use a solenoid valve-installed vacuum pump so that
even if power is cut off in the middle of evacuation of air
due to a power interruption, the valve will prevent the
pump oil from flowing back.
The equipment may be damaged if moisture remains in
the tubing, thus carry out the evacuation thoroughly.
(6) Recharge
When using a vacuum pump with exhaust air volume
more than 0.883 cu.ft./min. and ultimate vacuum pressure
rate of 50 micron Hg.
Standard time for evacuation
Length of tubing
Less than 33 ft. (10 m)
More than 33 ft. (10 m)
Evacuation time
More than 10 minutes
More than 15 minutes
(6) Recharging
Recharge unit in the same manner explained on the
previous page "(5) Recharging."
59
11-7. Charging Additional Refrigerant
11-7-1. When Tubes are Extended
Observe the proper amount of refrigerant as stated in this service manual or the installation manual that came
with the indoor unit. Charge additional refrigerant in liquid state only.
Never charge additional refrigerant if refrigerant is leaking from the unit. Follow
CAUTION
instructions given in "11-6. In Case Refrigerant is Leaking" and completely carry
out repairs. Only then should you recharge the refrigerant.
11-8. Retro-Fitting Existing Systems
11-8-1. Use of Existing Units
Never use new refrigerant R410A for existing units which use R22. This will cause the air conditioner to
operate improperly and may result in a hazardous condition.
11-8-2. Use of Existing Tubing
If replacing an older unit that used refrigerant R22 with a R410A unit, do not use its existing tubing. Instead,
completely new tubing must be used.
60
APPENDIX A INSTRUCTION MANUAL
KHS1872 + CH1872
KHS2472 + CH2472
(OI-852-6-4180-801-00-2)
A-1
Features
This air conditioner is an inverter type unit that automatically adjusts capacity as appropriate. Details on these functions
are provided below; refer to these descriptions when using the air conditioner.
•
Microprocessor Controlled Operation
•
Automatic Switching between Cooling and
Heating
This unit automatically switches between cooling
operation and heating operation according to the
difference between the room temperature and the
temperature setting.
The interior compartment of the remote control unit
contains several features to facilitate automatic
operation, easy logically displayed for easy use.
•
•
•
•
Simple One-touch Wireless Remote Control
The remote control unit has several features to
facilitate automatic operation.
•
Hot Start Heating System
Right from the start, the air is warm and
comfortable. This system prevents any cold blasts
at the beginning while the heat pump is warming
up, or even defrosting.
24-Hour ON or OFF Timer
This timer can be set to automatically turn the unit
on or off at any time within a 24 hour period.
1-Hour OFF Timer
This timer can be set to automatically turn off the
unit at any time after one hour.
•
•
Automatic Restart Function for Power Failure
Even when power failure occurs, preset
programmed operation can be reactivated once
power resumes.
Night Setback
Pressing this button changes the setting of the
room temperature thermostat, allowing you to set
the temperature at whatever level that you find
comfortable.
High Power Operation
If not in Auto Operation, the unit operates at
maximum output for 30 minutes, regardless of the
desired temperature.
The fan speed is 1 step above “High”.
•
•
Automatic and 3-step Fan Speed
Auto/High/Medium/Low
•
•
•
•
Quiet Operation
The fan rotates slower than the fan speed setting to
provide a quieter operating sound.
Air Sweep Control
This function moves a flap up and down in the air
outlet, directing air in a sweeping motion around the
room and providing comfort in every corner.
ION Operation
While it is operating, the unit generates negative
ions that freshen up the air in the room.
•
Auto. Flap Control
This automatically sets the flap to the optimum
position during heating, cooling, and drying
operation.
Anti-Mold Filter
This unit is equipped with an anti-mold filter that
inhibits the growth of mold and bacteria.
Air Clean Filter
An air filter that eliminates unpleasant odors and
cleans the air is available.
Purchase a replacement filter at your local dealer.
(model STK-FDXB)
OI-801-2-EG
2
Contents
Page
Features...................................................................................................................2
Product Information..................................................................................................3
Alert Symbols...........................................................................................................3
Installation Location .................................................................................................4
Electrical Requirements...........................................................................................4
Safety Instructions....................................................................................................4
Names of Parts ........................................................................................................5
Using the Remote Control Unit ..............................................................................10
Operation with the Remote Control Unit ................................................................12
1. Automatic Operation .....................................................................................12
2. Manual Operation .........................................................................................13
3. Adjusting the Fan Speed...............................................................................14
4. Fan Only........................................................................................................14
5. Night Setback Mode......................................................................................15
6. QUIET Mode.................................................................................................16
7. HIGH POWER Mode ....................................................................................16
8. ION Mode......................................................................................................16
Special Remarks....................................................................................................17
Setting the Timer....................................................................................................18
Using the 1-Hour OFF Timer .................................................................................20
Tips for Energy Saving...........................................................................................20
Adjusting the Airflow Direction ...............................................................................21
Operation without the Remote Control Unit ...........................................................22
Care and Cleaning.................................................................................................22
Troubleshooting......................................................................................................25
Operating Range....................................................................................................25
Product Information
If you have problems or questions concerning your Air Conditioner, you will need
the following information. Model and serial numbers are on the nameplate on the
bottom of the cabinet.
Model No. ______________________ Serial No. _______________________
Date of purchase ___________________________________________________
Dealer’s address ___________________________________________________
Phone number ___________________
Alert Symbols
The following symbols used in this manual, alert you to potentially
dangerous conditions to users, service personnel or the appliance:
This symbol refers to a hazard or unsafe
practice which can result in severe
personal injury or death.
This symbol refers to a hazard or unsafe
CAUTION
practice which can result in personal injury
or product or property damage.
OI-801-3EG
3
Installation Location
•
We recommend that this air conditioner be installed properly by qualified
installation technicians in accordance with the Installation Instructions
provided with the unit.
•
Before installation, check that the voltage of the electric supply in your home or
office is the same as the voltage shown on the nameplate.
•
•
Do not install this air conditioner where there are fumes or flammable
gases, or in an extremely humid space such as a greenhouse.
Do not install the air conditioner where excessively high heat-
generating objects are placed.
Avoid: To protect the air conditioner from heavy corrosion, avoid installing the outdoor
unit where salty sea water can splash directly onto it or in sulphurous air near a
spa.
Electrical Requirements
1. All wiring must conform to the local electrical codes. Consult your dealer or a
qualified electrician for details.
2. Each unit must be properly grounded with a ground (or earth) wire or through
the supply wiring.
3. Wiring must be done by a qualified electrician.
Safety Instructions
•
Read this Instruction Manual carefully before using this air conditioner. If
you still have any difficulties or problems, consult your dealer for help.
This air conditioner is designed to give you comfortable room conditions.
Use this only for its intended purpose as described in this Instruction
Manual.
•
•
•
Never use or store gasoline or other flammable vapor or liquid near the
air conditioner — it is very dangerous.
This air conditioner has no ventilator for intaking fresh air from
outdoors. You must open doors or windows frequently when you use
gas or oil heating appliances in the same room, which consume a lot of
oxygen from the air. Otherwise there is a risk of suffocation in an
extreme case.
•
•
Do not turn the air conditioner on and off from the power mains switch.
Use the ON/OFF operation button.
Do not stick anything into the air outlet of the outdoor unit. This is
dangerous because the fan is rotating at high speed.
Do not let children play with the air conditioner.
CAUTION
•
•
Do not cool or heat the room too much if babies or invalids are present.
OI-801-4-EG
4
Names of Parts
Air intakes
INDOOR UNIT
Air outlet
Remote control unit
Drain hose
Refrigerant tubes
OUTDOOR UNIT
Air outlet
This illustration is based on the external view of a standard model.
Consequently, the shape may differ from that of the air conditioner which you
have selected.
NOTE
This air conditioner consists of an indoor unit and an outdoor unit. You can
control the air conditioner with the remote control unit.
Air Intake Air from the room is drawn into this section and passes through air filters which
remove dust.
Air Outlet Conditioned air is blown out of the air conditioner through the air outlet.
Remote Control Unit The wireless remote control unit controls power ON/OFF, operation mode
selection, temperature, fan speed, timer setting, and air sweeping.
Refrigerant Tubes The indoor and outdoor units are connected by copper tubes through which
refrigerant gas flows.
Drain Hose Moisture in the room condenses and drains off through this hose.
Outdoor (Condensing) Unit The outdoor unit contains the compressor, fan motor, heat exchanger coil, and
other electrical components.
OI-801-5EG
5
Unit Display and Operation Button
INDOOR UNIT
IMPORTANT
OPERATION lamp
TIMER lamp
QUIET lamp
ION lamp
Avoid using radio equipment
such as mobile phone near
(within 4 ft.) the remote
control receiver. Some radio
equipment may cause
QUIET
OPERATION button
malfunction of the unit.
If the trouble happens,
disconnect power and restart
the air conditioner after a few
minutes.
REMOTE CONTROL receiver
REMOTE CONTROL receiver This section picks up infrared signals from the remote control unit (transmitter).
OPERATION button When the remote control cannot be used, pressing this button enables heating
and cooling operation.
Each time this button is pressed, the type of operation conducted is indicated by
the changing color of the OPERATION lamp. Press the button and select the
lamp color that suits your preference for operation.
Cooling operation
(green)
Heating operation
(red)
Stop
(lamp off)
OPERATION lamp This lamp lights when the system is in the continuous AUTO (red or green),
HEAT (red), DRY (orange), COOL (green) and FAN (green) mode.
The OPERATION lamp lights up red and orange alternately when the system is
defrosting.
TIMER lamp This lamp lights when the system is being controlled by the timer.
QUIET lamp This lamp lights during operation in the QUIET mode.
ION lamp This lamp lights during operation in the ION mode while the indoor unit is
operating.
The unit’s display lamps are dimmed during operation in the NIGHT SETBACK
mode.
NOTE
OI-801-6-EG
6
Remote Control Unit (Display)
Displayed when transmitting data
Displayed when indoor unit
sensor is in use
Displayed when setting
temperature
Displayed when temperature is
shown
Displayed when setting timer
Displayed when the
time display is set to
12-hour time.
Symbols
(4) Timer
(1) Operation mode
24-hour clock with ON/OFF
program Timer............................
AUTO .........................................
HEAT..........................................
MILD DRY ..................................
COOL.........................................
ON Timer....................................
OFF Timer..................................
1-hour OFF Timer.......................
FAN ............................................
(2) Fan speed
(5) NIGHT SETBACK ......................
(6) Confirmation of transmission .....
Automatic operation ...................
(7) Auto. flap indication....................
Flap angle indication ..................
Sweep indication........................
HIGH .........................................
MEDIUM.....................................
LOW...........................................
(8) High power operation.................
(9) Quiet operation...........................
(10)ION operation ...........................
(3) Temperature setting
60 – 86 °F
When set to 80 °F
temperature indication................
OI-801-7EG
7
Remote Control Unit
Sensor
Transmitter
(Cover closed)
Display
ON/OFF operation button
1 HR. TIMER button
ION button
Temperature setting buttons (TEMP.)
QUIET button
MODE selector button
NIGHT SETBACK button
HIGH POWER button
FAN SPEED selector button
FLAP button
ON TIME
setting
buttons
Advance button
Return button
OFF TIME
setting
buttons
Advance button
Return button
CLOCK button
CANCEL button
SENSOR button
Time display selector button
ACL button
ADDRESS switch
NOTE
Temperature display
selector button
The illustration above pictures the remote control unit after the cover has been
opened.
Transmitter When you press the buttons on the remote control unit, the
mark appears in
the display to transmit the setting changes to the receiver in the air conditioner.
Sensor A temperature sensor inside the remote control unit senses the room
temperature.
Display Information on the operating conditions is displayed while the remote control unit
is switched on. If the unit is turned off, FLAP setting and FAN SPEED setting are
not displayed.
ION button
: This button is for turning the negative ions generated during operation on
and off.
ON/OFF operation button This button is for turning the air conditioner on and off.
1 HR. TIMER button
(1-HOUR OFF TIMER)
: When you press this button, regardless of whether the unit is operating or
stopping, the unit operates for one hour and then shuts down.
OI-801-8-EG
8
Remote Control Unit (continued)
Temperature setting buttons Press the
(TEMP.) Press the
button to increase the set temperature.
button to reduce the set temperature.
The temperature setting changes by 1 °C or 2 °F each time one of the TEMP.
buttons is pressed.
QUIET button
: When you press this button, the fan rotates slower than the fan speed
setting to provide a quieter operating sound.
MODE selector button Use this button to select AUTO, HEAT, DRY, COOL or FAN mode.
(AUTO)
: When this setting is selected, the air conditioner calculates the difference
between the thermostat setting and the room temperature and
automatically switches to the ‘‘COOL’’ or ‘‘HEAT’’ mode as appropriate.
(HEAT)
(DRY)
: The air conditioner makes the room warmer.
: The air conditioner reduces the humidity in the room.
: The air conditioner makes the room cooler.
(COOL)
(FAN)
: The air conditioner works only as a circulation fan.
FAN SPEED selector button
: The air conditioner automatically decides the fan speeds.
: High fan speed
: Medium fan speed
: Low fan speed
NIGHT SETBACK button For details, see “5. Night Setback Mode”. When you press this button in the
HEAT, DRY or COOL mode, the mark appears in the display, and the remote
control unit will automatically adjust the set temperature to save energy.
FLAP button Press this button either to select the setting of the airflow direction to the auto.
flap in each mode or one of the six possible positions manually or to select the
sweep function which moves the flap up and down automatically.
: Auto flap setting: If selected in a heating operation, the flap is set to
position (3) in the following chart. If selected in a cooling or dry operation,
the flap is set at position (7) in the following chart.
: The airflow direction can be set manually. (six positions)
: The flap moves up and down automatically.
When you press the FLAP button, the air flow direction will be changed one by
one as follows.
NOTE
SWEEP
HIGH POWER button
: If this button is pressed during HEAT, DRY, COOL or FAN operation, the
unit operates at maximum output for 30 minutes, regardless of the desired
temperature.
The fan speed is 1 step above “High”.
ON TIME/OFF TIME setting No display: The timer does not operate.
buttons
: The air conditioner starts at the set time.
: The air conditioner stops at the set time.
: The air conditioner stops and starts, or starts and stops, at the
set times every day. For details, see “Setting the Timer”.
The indoor fan runs continuously when the system is in normal operation. It does not turn off when the
desired room temperature is reached. If Night Set Back mode is selected, the fan will turn off
intermittently during cooling operation in order to control air flow.
NOTE
OI-801-9EG
9
Remote Control Unit (continued)
SENSOR button When you press this button (use a small-tipped object such as a ballpoint pen),
the
mark will appear at the display. And the room temperature is detected by
the sensor which is built into the indoor unit and the air conditioner is controlled
accordingly.
If the remote control is located near a heat source, such as a space heater or in
NOTE
direct sunlight, press the SENSOR button to switch to the sensor on the indoor
unit.
Temperature Display Selector This switches the temperature display between °C and °F.
button
Time Display Selector button This switches the time display between 24-hour time and 12-hour time.
ACL button (ALL CLEAR) Puts the remote control unit into pre-operation status. Always press this button
after replacing the batteries.
ADDRESS switch
•
The address switch changes to prevent mixing of signals from remote control
units when two air conditioners are installed next to each other. Normally, the
address switch is set to A. For more information, please contact the dealer
where you made the purchase.
•
Normally, the tabs on the remote control unit should not be bent.
The remote control unit sends the temperature signal to the air conditioner regularly at five minute
intervals. If the signal from the remote control unit stops for more than 15 minutes due to the loss of the
remote control unit or other trouble, the air conditioner will switch to the temperature sensor which is built
into the indoor unit and control the room temperature. In these cases, the temperature around the remote
control unit may differ from the temperature detected at the air conditioner’s position.
NOTE
Using the Remote Control Unit
How to Install Batteries
1. Slide the cover in the direction
indicated by the arrow and remove it.
2. Install two AAA alkaline batteries.
Make sure the batteries point in the
direction marked in the battery
compartment.
3. Use a thin object such as the tip of a
pen to press the ACL button.
ACL button
•
The batteries last about six months, depending on how much you use
the remote control unit. Replace the batteries when the remote control
unit’s display fails to light, or when the remote control cannot be used to
change the air conditioner’s settings.
NOTE
•
•
Use two fresh leak-proof type-AAA alkaline batteries.
In replacing batteries, follow the instructions as mentioned in the sub-
section “How to Install Batteries”.
•
If you do not use the remote control unit more than 1 month, take out the
batteries.
OI-801-10-EG
10
Using the Remote Control Unit (continued)
How to Use the Remote When using the remote control unit, always point the unit’s transmitter head
Control Unit directly at the air conditioner’s receiver.
Air conditioner
(Indoor unit)
Receiver
Remote control
unit
(Transmitter head)
Remote Control Unit The remote control unit may be operated either from a non-fixed position or from
Installation Position a wall-mounted position. To ensure that the air conditioner operates correctly, DO
NOT install the remote control unit in the following places:
DO NOT
•
•
•
•
•
•
•
In direct sunlight
Behind a curtain or other places where it is covered
More than 26 feet (8 m) away from the air conditioner
In the path of the air conditioner’s airstream
Where it may become extremely hot or cold
Where it may be subject to electrical or magnetic noise
Where there is an obstacle between the remote control unit and air
conditioner (since a check signal is sent from the remote control unit every 5
minutes)
Mounting the Remote Control Before mounting the remote control unit, press the ON/OFF operation button at
Unit the mounting location to make sure that the air conditioner operates from that
location. The indoor unit should make a beeping sound to indicate that it has
received the signal.
Rear side
Remote control
unit mount
Press
Mounting screws
5/32 x 5/8" (4 x 16 mm)
(included)
Hole
Set in
place
• To prevent loss of the remote control unit,
you can connect the remote control unit to
the mount by passing a string through the
remote control unit and attachment hole.
To take out the remote control unit, pull it forward.
When Holding the Remote
Control Unit
•
When using the remote control unit and during air conditioner operation, the
transmitter on the remote control unit should be pointed toward the receiver
on the indoor unit.
•
Make sure that there are no objects between the remote control unit and
receiver which could block the signal.
OI-801-11EG
11
Operation with the Remote Control
Unit
This unit automatically switches between cooling operation and heating operation
according to the difference between the room temperature and the temperature
setting.
1. Automatic Operation
STEP 2
STEP 1
Check that the circuit breaker on the power panel is turned on.
NOTE
Once
mode is selected and the unit is preset by following the steps below, you
can have the air conditioner automatically bring the room to the desired
temperature simply by pressing the ON/OFF operation button.
STEP 1
STEP 2
Press the MODE selector button to
Press the ON/OFF operation button.
.
To stop the air conditioner, press the ON/OFF operation button again.
•
To change the temperature setting; press the temperature setting buttons and
change the setting to the desired temperature.
NOTE
OI-801-12-EG
12
Operation with the Remote Control Unit (continued)
2. Manual Operation
STEP 2
STEP 3
STEP 1
STEP 4
STEP 5
Check that the circuit breaker on the power panel is turned on.
NOTE
If the automatic operation settings of the unit do not meet your needs, press the
setting buttons as described below and change the settings as desired.
STEP 1
Press the MODE selector button and select the desired mode.
For heating operation
For dehumidifying operation
For cooling operation
For fan only operation
→
→
→
→
STEP 2
STEP 3
To start the air conditioner, press the ON/OFF operation button.
Press the TEMP. setting buttons to change the temperature
setting to the desired temperature.
Adjustable temperature range:
30 °C max.
16 °C min.
or
86 °F max.
60 °F min.
STEP 4
STEP 5
Set the FAN SPEED selector button to the setting you want.
Press the FLAP button and set the airflow direction as desired.
(Refer to “Adjusting the Airflow Direction” on page 21.)
To stop the air conditioner, press the ON/OFF operation button again.
OI-801-13EG
13
Operation with the Remote Control Unit (continued)
•
Choose the best position in the room for the remote control unit, which also
acts as the sensor for room comfort and transmits the operating instructions.
Once you’ve found this best position, always keep the remote control unit
there.
NOTE
•
This appliance has a built-in 5-minute time delay circuit to ensure reliable
operation. When the operation button is pressed, the compressor will start
running within three minutes. In the event of power failure, the unit will stop.
3. Adjusting the Fan Speed
A. Automatic fan speed
Simply set the FAN SPEED selector button to the
position.
This automatically sets the best fan speed for the room temperature.
B. Manual fan speed
4. Fan Only
If you want to adjust fan speed manually during operation, just set the FAN
SPEED selector button as desired. [
,
, or
]
STEP 2
STEP 1
STEP 3
If you want to circulate air without any temperature control, follow these steps:
STEP 1
STEP 2
STEP 3
Press the MODE selector button to switch to the fan mode
Press the ON/OFF operation button.
.
Press the FAN SPEED selector button to select the fan speed of
your choice ( or ).
,
OI-801-14-EG
14
Operation with the Remote Control Unit (continued)
5. Night Setback Mode
Night Setback Mode is used for saving energy.
Press the NIGHT SETBACK button while operation.
The
mark appears in the display.
To release the night setback function, press the NIGHT SETBACK button again.
A. In Cooling and DRY
Mode: ( and
When the night setback mode is selected, the air conditioner automatically
raises the temperature setting 2 °F when 30 minutes have passed after the
selection was made, and then another 2 °F after another 30 minutes have
passed, regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing comfort. This
function is convenient when gentle cooling is needed.
)
2 °F
Setting
temperature
2 °F
30 min.
30 min.
Press the NIGHT
SETBACK button
Time
B. In Heating Mode: (
)
When the night setback mode is selected, the air conditioner automatically
lowers the temperature setting 4 °F when 30 minutes have passed after the
selection was made, and then another 4 °F after another 30 minutes have
passed, regardless of the indoor temperature when night setback was
selected. This enables you to save energy without sacrificing comfort. This
function is convenient when gentle heating is needed.
Setting
temperature
4 °F
4 °F
30 min.
30 min.
Press the NIGHT
SETBACK button
Time
OI-801-15EG
15
Operation with the Remote Control Unit (continued)
6. QUIET Mode
QUIET Mode is used to reduce the fan sound of the indoor unit.
Press the QUIET button.
The
mark appears in the display.
To cancel, press QUIET button again.
•
•
In QUIET Mode, the fan rotates at a slower speed than the fan speed setting.
If the unit is already operating with a very low airflow, the fan sound may not
change even if the QUIET button is pressed.
7. HIGH POWER Mode
HIGH POWER mode can be used to increase the output of the indoor unit for all
operation modes except automatic operation.
Press the HIGH POWER button.
The
mark appears in the display.
To cancel, press HIGH POWER button again.
•
When the HIGH POWER button is pressed, the unit operates at maximum
output for 30 minutes, regardless of the desired temperature. The fan speed is
1 step above “High”.
•
•
HIGH POWER Mode cannot be used when the operation mode is Automatic
Operation.
QUIET Mode and HIGH POWER Mode cannot be used at the same time.
• When set to High fan speed during heating operation, the fan
runs at High fan speed even though the mark is displayed.
NOTE
• Depending on the operating conditions, the fan speed may be
increased by a small amount only.
8. ION Mode
The ION mode is used during operation to generate negative ions that freshen up
the air in the room.
Press the ION button.
The
mark appears in the display.
To cancel, press ION button again.
•
•
•
The indoor unit’s ION lamp lights up while negative ions are being generated.
ION “on” is the remote control unit’s initial setting.
The negative ions are generated from the negative ion generator.
OI-801-16-EG
16
Special Remarks
‘‘DRY’’ ( ) Operation
How it works?
•
•
•
Once the room temperature reaches the level that was set, the unit’s operation
frequency is changed automatically.
During DRY operation, the fan speed automatically runs at lower speed for
providing a comfortable breeze.
‘‘DRY’’ operation is not possible if the indoor temperature is 59 °F or less.
Heating ( ) Operation
Heating performance
•
•
Because this air conditioner heats a room by drawing in the heat of the
outside air (heat pump system), the heating efficiency will fall off when the
outdoor temperature is very low. If sufficient heat cannot be obtained with this
air conditioner, use another heating appliance together with it.
Defrosting
When the outdoor temperature is low, frost or ice may form on the heat
exchanger coil, reducing heating performance. When this happens, a
microcomputer defrosting system operates. At the same time, the fan on the
indoor unit stops and the OPERATION lamp lights up red and orange
alternately until defrosting is completed. Heating operation restarts after
several minutes. (This interval will vary slightly depending upon the outdoor
temperature and the way in which frost forms.)
Cold draft prevention
•
For several minutes after the start of heating operation, the indoor fan runs at
lower speed until the indoor heat exchanger coil has warmed up sufficiently.
However, the fan may remain stopped when the room temperature is low. This
is because the COLD DRAFT PREVENTION SYSTEM is operating.
•
•
Sometimes the indoor unit may not get to the set fan speed such as LOW and
QUIET under cool operation at very low outdoor temperatures due to the
indoor unit being protected from ice or frost.
Cooling ( ) Operation
In the event of power failure, the unit will stop. When the power is resumed,
the unit will restart automatically within five minutes by the remote control unit.
Power failure during
operation
Clicking Sound
Clicking sound is heard from
the air conditioner
•
•
In heating or cooling operation, any plastic parts may expand or shrink due to
a sudden temperature change. In this event, a clicking sound may occur. This
is normal, and the sound will soon disappear.
The remote control unit sends the setting condition to the air conditioner
regularly at five minute intervals.
Remote Control Unit
OI-801-17EG
17
Setting the Timer
In the descriptions below, the following settings are used for the temperature and
time indicator selector button on the bottom front section of the remote control.
NOTE
•
•
Temperature: °F
Time: AM, PM
(Example) To set to 10:30 pm.
1. How to set the present
time
Operation
Indication
1. Press the CLOCK button once if
The time indication alone flashes.
the time indicator is not flashing.
2. Press the Advance, Return ( ,
) button until PM 10:30 is
displayed.
The time can be set in 1-minute
increments. Holding down the button
advances the time rapidly in 10-minute
increments.
3. Press the CLOCK button again.
This completes the setting of the
current time.
(Example) To stop the air conditioner at 11:00 am.
2. How to set the OFF time
1. Press the OFF TIME setting
The timer
indication is displayed,
button once.
and the present OFF time is shown.
2. Press the Advance, Return ( ,
) button until AM 11:00 is
displayed.
The timer indication blinks.
The time can be set in 10-minute
increments. Holding down the button
advances the time rapidly in 10-minute
increments.
3. Wait a few seconds, and then the The timer
indication stops
setting is complete.
blinking and the present time is
displayed.
OI-801-18-EG
18
Setting the Timer (continued)
(Example) To start operation at 7:10 am.
3. How to set the ON time
Operation
Indication
indication is
1. Press the ON TIME setting
The timer
button once.
displayed, and the present ON time
is shown.
2. Press the Advance, Return ( ,
) button until AM 7:10 is
displayed.
The timer
indication blinks.
The time can be set in 10-minute
increments. Holding down the
button advances the time rapidly in
10-minute increments.
3. Wait a few seconds, and then
The timer
indication stops
the setting is complete.
blinking and the present time is
displayed.
(Example) To start operation at 7:10 am. and stop the air conditioner at 11:00 am.
4. How to set DAILY ON/OFF
REPEAT timer
10:30 pm.
Present time
7:10 am.
ON
11:00 am.
OFF
1. Set the timer ON/OFF times as
The present time 10:30 pm. and
are displayed.
shown in 2-1, 2, 3 and 3-1, 2, 3.
•
The ON/OFF combination timer uses the current time as
the reference, and it is activated starting from whichever
set time comes first.
NOTE
•
•
With the ON/OFF combination timer, the settings are
repeated every day.
You can check the timer ON/OFF times after you have set
them by pressing the ON TIME and OFF TIME setting
buttons.
To cancel a timer program
•
•
Press the CANCEL button.
When either an ON or OFF timer is to be canceled, press the button
corresponding to the timer whose program is to be canceled, and then press
the CANCEL button.
•
•
The airflow direction, fan speed and temperature setting can be changed after
a timer program has been set even when the unit is stopped. Even when
operation is stopped during an ON timer program, the unit will start operating
when the set time is reached provided that the program is not canceled.
When the ON timer and OFF timer are set to the same time, the timer
operates as if it is turned off.
NOTE
OI-801-19EG
19
Using the 1-Hour OFF Timer
1. 1-Hour OFF Timer This function causes the unit to operate for one hour and then stop,
regardless of whether the unit is on or off when this button is pressed.
The
indicator in the display indicates that this function is operating.
Setting procedure:
Regardless of whether the unit is operating or stopped, press the 1 HR. TIMER
button.
appears in the display.
Cancellation procedure:
Press the ON/OFF operation button to turn the unit off, wait for the unit to stop
operating, and then press the ON/OFF operation button again.
The 1-Hour Timer function is now cancelled and the unit operates normally.
•
If, while the 1-Hour Timer function is operating, the 1HR. TIMER button is
pressed once to cancel the function and then again, the unit continues to
operate for one hour from that point in time and then stops.
NOTE
•
It is not possible to use the OFF Timer and 1-Hour OFF Timer together.
Whichever function is set last takes precedence. If the 1 HR. TIMER button is
pressed while the TIMER OFF function operates, the OFF Timer is cancelled
and the unit will stop operating one hour later.
2. Operation together with the The 1-Hour OFF Timer setting is given priority over the DAILY ON/OFF REPEAT
DAILY ON/OFF REPEAT Timer setting.
Tips for Energy Saving
Do not
•
Block the air intake and outlet of the unit. If they are obstructed, the unit
will not work well, and may be damaged.
•
Let direct sunlight into the room. Use sunshades, blinds or curtains. If the walls
and ceiling of the room are warmed by the sun, it will take longer to cool the
room.
Do
•
•
Always try to keep the air filter clean. (Refer to “Care and Cleaning”.) A
clogged filter will impair the performance of the unit.
To prevent conditioned air from escaping, keep windows, doors and any other
openings closed.
OI-801-20-EG
20
Adjusting the Airflow Direction
1. Horizontal The horizontal airflow can be adjusted by moving the vertical vanes with your
hands to the left or right.
When the humidity is high, the vertical vanes should be in the front
CAUTION
position during the cooling or dehumidifying operation. If the vertical
vanes are positioned all of the way to the right or left, condensation may
begin to form around the air vent and drip down.
2. Vertical The vertical airflow can be adjusted by moving the flap with the remote control
unit. Do not move the flap with your hands. Confirm that the remote control unit
has been turned on. Use the FLAP button to set either the sweep function or one
of the six airflow direction settings.
COOL
SWEEP
DRY
FAN
SWEEP
HEAT
A. Sweep function
B. Setting the airflow manually
Referring to the above illustration, use the
The flap starts moving up and down to
deliver air over the sweep range.
FLAP button to set the airflow direction
within the range used during the heating,
cooling, or dehumidifying operation.
C. Auto flap function
The flap is set to the recommended
position.
•
•
The flap automatically closes when the unit is off.
NOTE
During the heating operation, the fan speed will be very low and the flap will
be in the horizontal position (position ) until the air being blown out of the
unit begins to warm. Once the air warms up, the flap position and fan speed
change to the settings specified with the remote control.
•
•
Use the FLAP button on the remote control to adjust the position of the
flap. If you move the flap by hand, the flap position according to the
remote control and the actual flap position may no longer match. If this
should happen, shut off the unit, wait for the flap to close, and then turn
on the unit again; the flap position will now be normal again.
CAUTION
Do not have the flap pointed down during cooling operation.
Condensation may begin to form around the air vent and drip down.
OI-801-21EG
21
Operation without the Remote
Control Unit
INDOOR UNIT
If you have lost the remote control unit or it has trouble, follow the steps below.
When the air conditioner is not running
Each time the OPERATION button is pressed, the type of operation conducted is
indicated by the changing color of the OPERATION lamp. Press the button and
select the lamp color that suits your preference for operation.
Cooling operation
(green)
Heating operation
(red)
Stop
(lamp off)
OPERATION button
The temperature is set to the room temperature minus 4 °F during the cooling
operation and to the room temperature plus 4 °F during the heating operation,
and the fan speed and flap are set to Auto.
NOTE
Care and Cleaning
1. For safety, be sure to turn the air conditioner off and also to disconnect
the power before cleaning.
2. Do not pour water on the indoor unit to clean it. This will damage the
internal components and cause an electric shock hazard.
Casing and Grille (Indoor Unit) Clean the casing and grille of the indoor unit with a vacuum cleaner brush, or
wipe them with a clean, soft cloth.
If these parts are stained, use a clean cloth moistened with a mild liquid
detergent. When cleaning the grille, be careful not to force the vanes out of place.
1. Never use solvents, or harsh chemicals when cleaning the indoor unit.
CAUTION
Do not wipe the plastic casing using very hot water.
2. Some metal edges and the fins are sharp and may cause injury if
handled improperly; be especially careful when you clean these parts.
3. The internal coil and other components of the outdoor unit must be
cleaned every year. Consult your dealer or service center.
OI-801-22-EG
22
Care and Cleaning (continued)
Anti-Mold Filter The anti-mold filter behind the air intake grille should be checked and cleaned at
least once every two weeks.
How to remove the anti-mold 1. Grasp both ends of the air
Air intake grille
filter
intake grille, and remove it by
opening towards the front and
pulling towards you.
2. Remove the anti-mold filter
attached to the rear of the air
intake grille.
Anti-mold filter
Cleaning Use a vacuum cleaner to remove light dust. If there is sticky dust on the filter,
wash the filter in lukewarm, soapy water, rinse it in clean water, and dry it.
How to replace the anti-mold 1. With the FRONT mark of the
Anti-mold filter
filter
anti-mold filter at the front,
align the two indentions near
the mark with the hooks at the
rear of the air intake grille, and
then mount the anti-mold filter.
FRONT mark
Hook
2. Allow the edge of the air intake
grille to slide into the top of the
indoor unit, and then insert it
all the way inside.
Groove
Pin
Air intake grille
3. To attach the air intake grille to
the indoor unit, press its
bottom right and left corners as
well as its bottom center into
place.
Air intake grille
Attach so that the round pins at the top right and left corners of the air intake grille
are inserted into the grooves at the top right and left of the indoor unit.
NOTE
OI-801-23EG
23
Care and Cleaning (continued)
Air Clean Filter The air clean filter removes dust and dirt from the air, and reduces odors and smoke from
tobacco.
This air clean filter cannot remove harmful gases or vapors nor ventilate air in the
room. You must open doors or windows frequently when you use gas or oil heating
appliances. Otherwise there is a risk of suffocation in extreme cases.
How to install the air The air clean filter needs to be installed behind the air intake grille.
clean filter 1. Remove the air intake grille.
2. Install the air clean filter in the position
shown in the figure.
3. Remount the air intake grille.
Air clean filter
How to clean the air
clean filter
•
•
•
In general, the filter should be sucked to remove dust in low fan speed of a vacuum
cleaner once every three months.
If there is heavily grime on the filter, soak the filter in lukewarm water with neutral
detergent diluted 1:500 for 1 to 2 minutes then wash it.
Rinse the filter in clean water, then let it dry on the towel in room temperature.
•
•
Do not bend nor give excessive force onto the air clean filter.
If the filter surface is heavily blocked with dirt or damaged, replace it with new one.
Purchase a replacement filter at your local dealer. (model STK-FDXB)
NOTE
Cleaning the main unit
and remote control
unit
•
•
Wipe clean using a soft, dry cloth.
To remove stubborn dirt, moisten a cloth in warm water no hotter than 104 °F, wring
thoroughly, and then wipe.
•
The air intake grille can be removed in order to wash it with water.
Removing and Refer to “How to remove the anti-mold filter” and “How to replace the anti-mold filter” on
remounting the air page 23.
intake grille
When using a footstool or the like, be careful not to let it tip over.
CAUTION
Washing the grille
with water
•
•
Clean the grille gently using a soft sponge, or the like. Then wipe away any remaining
moisture.
Neutral detergent may be used to remove stubborn dirt. Then rinse thoroughly with
water and wipe away any remaining moisture.
Cleaning the negative Follow the steps below when the generator has
ion generator become dirty.
For safety, be sure to turn the air conditioner
off and also to disconnect the power before
cleaning.
Remove the dust on the negative ion generator.
•
•
Use a toothbrush, etc. to dust off the end.
Use a cotton swab, etc., to clean around the
generator inside the plastic case, taking care
not to touch the electrodes.
Negative ion generator
(metal electrodes inside
plastic case)
•
•
•
During use, the negative ion generator and other metal parts may become discolored:
this is normal and not indicative of malfunctioning.
If the dirt on and around the negative ion generator is left to build up, a puffing or
sputtering sound will eventually be heard. In this case, clean the generator immediately.
Do not apply excessive force while performing maintenance.
NOTE
OI-801-24-EG
24
Troubleshooting
If your air conditioner does not work properly, first check the following points before requesting service. If it still does not
work properly, contact your dealer or service center.
Trouble
Possible Cause
1. Power failure.
Remedy
1. Restore power.
Air conditioner does not run at all.
2. Leakage circuit breaker tripped.
3. Line voltage is too low.
2. Contact service center.
3. Consult your electrician or dealer.
4. Replace batteries.
4. Batteries in remote control unit have
run down.
OPERATION lamp blinks and air
conditioner does not operate.
Trouble in system.
Contact service center.
Compressor runs but soon stops.
Obstruction in front of condenser coil.
1. Dirty or clogged air filter.
Remove obstruction.
Poor cooling (or heating) performance.
1. Clean air filter to improve airflow.
2. Eliminate heat source if possible.
2. Heat source or many people in
room.
3. Doors and/or windows are open.
3. Shut them to keep the heat (or cold)
out.
4. Obstacle near air intake or air
discharge port.
4. Remove it to ensure good airflow.
5. Thermostat is set too high for
cooling (or too low for heating).
5. Set the temperature lower (or
higher).
6. (Outdoor temperature is too low for
heating.)
6. (Consult your dealer or try to use
another heat appliance.)
Clicking sound is heard from the air
conditioner.
In heating or cooling operation, any
plastic parts may expand or shrink due
to a sudden temperature change. In
this event, a clicking sound may occur.
This is normal, and the sound will soon
disappear.
OPERATION lamp lights but outdoor
unit will not run.
1. The use of cellular phones near the
air conditioner may cause
1. Turn off the power then restart the
air conditioner after a while.
disturbance to its normal operation.
2. Consult your dealer.
Operating Range
The air conditioner is operable within the temperature ranges as listed below:
Temperature
Indoor air temperature
Outdoor air temperature
COOLING
HEATING
Max.
Min.
Max.
Min.
95 °F DB / 71 °F WB
67 °F DB / 57 °F WB
80 °F DB / 67 °F WB
– DB / – WB
115 °F DB
0 °F DB
75 °F DB / 65 °F WB
0 °F DB
OI-801-25EG
25
APPENDIX B INSTALLATION INSTRUCTIONS
KHS1872 + CH1872
KHS2472 + CH2472
(II-852-6-4189-989-00-3)
A-2
INSTALLATION INSTRUCTIONS
COOL/DRY/HEAT Model
– Inverter Split System Air Conditioner –
This air conditioner uses the new refrigerant R410A.
NOTE
Refrigerant service valve size = 5/16"
Contents
Model Combinations
Page
Combine indoor and outdoor units only as listed
below.
IMPORTANT!
Please Read Before Starting .................................. 2
Indoor Unit
KHS1872
KHS2472
Outdoor Unit
CH1872
1. GENERAL .......................................................... 3
1-1. Tools Required for Installation (not supplied)
1-2. Accessories Supplied with Unit
CH2472
1-3. Optional Copper Tubing Kit
1-4. Type of Copper Tube and Insulation Material
1-5. Additional Materials Required for Installation
Power Source:
60 Hz, single-phase, 230/208 V
2. INSTALLATION SITE SELECTION ................... 4
2-1. Indoor Unit
Be sure to read the yellow instruction sheet
attached to the outdoor unit for models using the
new refrigerant R410A.
2-2. Outdoor Unit
3. HOW TO INSTALL THE INDOOR UNIT ............. 6
3-1. Remove the Rear Panel from the Unit
3-2. Make a Hole
3-3. Install the Rear Panel on the Wall
3-4. Remove the Grille to Install the Indoor Unit
3-5. Shape the Indoor Side Tubing
3-6. Wiring Instructions
7. REMOTE CONTROL UNIT INSTALLATION
POSITION ......................................................... 23
7-1. Mounting on a Wall
3-7. Recommended Wire Length and Diameter
3-8. Wiring Instructions for Inter-unit Connections
3-9. Mounting
8. ADDRESS SWITCH.......................................... 24
8-1. Address Setting of the Remote
Control Unit
3-10. Drain Hose
4. HOW TO INSTALL THE OUTDOOR UNIT ....... 16
4-1. Wiring Instructions for the Outdoor Unit
5. REFRIGERANT TUBING.................................. 17
5-1. Use of the Flaring Method
5-2. Flaring Procedure with a Flare Tool
5-3. Caution before Connecting Tubes Tightly
5-4. Connecting Tubing between Indoor and
Outdoor Units
5-5. Insulation of Refrigerant Tubing
5-6. Taping the Tubes
5-7. Finishing the Installation
NOTE
The illustrations are based on the typical appearance of
a standard model. Consequently, the shape may differ
from that of the air conditioner that you are installing.
6. AIR PURGING................................................... 19
I Air Purging with a Vacuum Pump (for Test Run)
I Basic Functions of the Service Valves
I Pump Down
SANYO Commercial Solutions
A Division of SANYO North America Corporation
In Canada
SANYO Canada Inc.
Cornerstone Business Park,
1062 Thorndale Avenue,
1-300 Applewood Crescent, Concord
Ontario, L4K 5C7, Canada
Bensenville, IL 60106, U.S.A.
85264189989003 © SANYO 2007
W
IMPORTANT!
Please Read Before Starting
This air conditioning system meets strict safety and operating
standards. As the installer or service person, it is an important
part of your job to install or service the system so it operates
safely and efficiently.
When Installing…
…In a Ceiling or Wall
Make sure the ceiling/wall is strong enough to hold the
unit’s weight. It may be necessary to construct a strong
wood or metal frame to provide added support.
For safe installation and trouble-free operation, you
must:
…In a Room
G
Carefully read this instruction booklet before beginning.
Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to
walls and floors.
G
Follow each installation or repair step exactly as shown.
G
Observe all local, state, and national electrical codes.
G
Pay close attention to all warning and caution notices
given in this manual.
…In Moist or Uneven Locations
Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.
This symbol refers to a hazard
or unsafe practice which can
result in severe personal injury
WARNING
or death.
…In an Area with High Winds
This symbol refers to a hazard
or unsafe practice which can
result in personal injury or prod-
uct or property damage.
Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baffle.
CAUTION
…In a Snowy Area (for Heat Pump-type Systems)
Install the outdoor unit on a raised platform that is higher
than drifting snow. Provide snow vents.
If Necessary, Get Help
These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.
When Connecting Refrigerant Tubing
• Use the flare method for connecting tubing.
• Apply refrigerant lubricant to the matching surfaces of
the flare and union tubes before connecting them, then
tighten the nut with a torque wrench for a leak-free
connection.
In Case of Improper Installation
The manufacturer shall in no way be responsible for improp-
er installation or maintenance service, including failure to
follow the instructions in this document.
• Check carefully for leaks before starting the test run.
When Servicing
SPECIAL PRECAUTIONS
• Turn the power OFF at the main power box (mains) before
opening the unit to check or repair electrical parts and
wiring.
WARNING
When Wiring
ELECTRICAL SHOCK CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH. ONLY A
• Keep your fingers and clothing away from any moving
parts.
QUALIFIED, EXPERIENCED ELECTRICIAN
SHOULD ATTEMPT TO WIRE THIS SYSTEM.
• Do not supply power to the unit until all wiring and tubing
are completed or reconnected and checked.
• Highly dangerous electrical voltages are used in this
system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and
inadequate grounding can cause accidental injury or
death.
• Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left inside
the unit being serviced.
Others
CAUTION
• Ground the unit following local electrical codes.
• Connect all wiring tightly. Loose wiring may cause over-
heating at connection points and a possible fire hazard.
• Ventilate any enclosed areas when installing or testing
the refrigeration system. Escaped refrigerant gas, on
contact with fire or heat, can produce dangerously
toxic gas.
When Transporting
Be careful when picking up and moving the indoor and out-
door units. Get a partner to help, and bend your knees when
lifting to reduce strain on your back. Sharp edges or thin alu-
minum fins on the air conditioner can cut your fingers.
• Confirm upon completing installation that no refrigerant
gas is leaking. If escaped gas comes in contact with a
stove, gas water heater, electric room heater or other heat
source, it can produce dangerously toxic gas.
2
1. General
6. Sabre saw or key hole saw
7. Hacksaw
8. Core bits
9. Hammer
10. Drill
This booklet briefly outlines where and how to install the
air conditioning system. Please read over the entire set
of instructions for the indoor and outdoor units and make
sure all accessory parts listed are with the system before
beginning.
11. Tube cutter
1-1. Tools Required for Installation (not supplied)
1. Standard screwdriver
12. Tube flaring tool
13. Torque wrench
14. Adjustable wrench
15. Reamer (for deburring)
2. Phillips head screwdriver
3. Knife or wire stripper
4. Tape measure
5. Carpenter’s level
1-2. Accessories Supplied with Unit
Table 1
Parts
Figure
Q’ty
Parts
Figure
Q’ty
Parts
Figure
Q’ty
Truss-head
Remote
control unit
Tapping screw
Phillips
Hex wrench*
1
10
1
5/32 ¥ 5/8" (4¥16 mm)
Remote control
unit holder
1
8
Clamp
1
Rawl plug
*Packed in the outdoor unit.
Drain hose
adapter
AAA alkaline
battery
2
2
1
4
Cushion
rubber*
Air clean filter
1-3. Optional Copper Tubing Kit
2. Foamed polyethylene insulation for the specified
copper tubes as required to precise length of tubing.
Wall thickness of the insulation should be not less
than 5/16" (8 mm).
Copper tubing for connecting the outdoor unit to the
indoor unit is available in kits which contain the narrow
and wide tubing, fittings and insulation. Consult your
nearest sales outlet or A/C workshop.
3. Use insulated copper wire for field wiring. Wire size
varies with the total length of wiring. Refer to 3-6.
Wiring Instructions for details.
1-4. Type of Copper Tube and Insulation Material
If you wish to purchase these materials separately from
a local source, you will need:
Check local electrical codes
and regulations before
obtaining wire. Also, check
any specified instructions or
limitations.
CAUTION
1. Deoxidized annealed copper tube for refrigerant tub-
ing as detailed in Table 2.
Cut each tube to the appropriate lengths 1' to 1'4"
(30 cm to 40 cm) to dampen vibration between units.
Table 2
Narrow Tube
Model
Wide Tube
Outer Dia. Thickness
Outer Dia.
Thickness
KHS1872
KHS2472
1/4" (6.35 mm)
1/4" (6.35 mm)
0.0314" (0.8 mm) 1/2" (12.70 mm) 0.0314" (0.8 mm)
0.0314" (0.8 mm) 5/8" (15.88 mm) 0.0393" (1.0 mm)
3
1-5. Additional Materials Required for Installation
Indoor unit
1. Refrigeration (armored) tape
2. Insulated staples or clamps for connecting wire
(See local codes)
3. Putty
4. Refrigeration lubricant
5. Clamps or saddles to secure refrigerant tubing
Drain hose
2. Installation Site Selection
Outside drainage
2-1. Indoor Unit
Fig. 1
To prevent abnormal heat genera-
tion and the possibility of fire, do
not place obstacles, enclosures
and grilles in front of or surround-
ing the air conditioner in a way
that may block air flow.
WARNING
6" (15 cm)
min.
2" (5 cm)
min.
2" (5 cm)
min.
AVOID:
G direct sunlight.
Front View
G nearby heat sources that may affect performance of the unit.
G areas where leakage of flammable gas may be expected.
G places where large amounts of oil mist exist.
Fig. 2
Tubing length (L)
INDOOR
UNIT
DO:
G select an appropriate position from which every corner of
Elevation
difference (H)
OUTDOOR
UNIT
the room can be uniformly cooled. (High on a wall is best.)
G select a location that will hold the weight of the unit.
G select a location where tubing and drain hose have the
Fig. 3a
shortest run to the outside. (Fig. 1)
G allow room for operation and maintenance as well as unre-
CAUTION
stricted air flow around the unit. (Fig. 2)
Indoor unit
Wall
G install the unit within the maximum elevation difference (H)
above or below the outdoor unit and within a total tubing length
(L) from the outdoor unit as detailed in Table 3 and Fig. 3a.
For stable operation of the
air conditioner, do not
install wall-mounted type
indoor units less than 5'
(1.5 m) from floor level.
Minimum height
from floor level
5' (1.5 m)
G Install the indoor unit more than 3.3' (1 m) away from any
antenna or power lines or connecting wires used for television,
radio, telephone, security system, or intercom. Electrical noise
from any of these sources may affect operation.
Floor level
Fig. 3b
Table 3
Max. Allowable Tubing
Length at Shipment
(ft.)
Limit of Tubing
Length (L)
(ft.)
Limit of Elevation
Difference (H)
(ft.)
Required Amount of
Additional Refrigerant
(oz./ft.)*
Model
KHS1872
KHS2472
25
33
98
98
49
49
0.27
0.27
* If total tubing length becomes 25 to 98 ft. (Max.) or 33 to 98 ft. (Max.), charge additional refrigerant (R410A) by 0.27 oz./ft.
No additional charge of compressor oil is necessary. For more detailed charging information, refer to the Technical & Service Manual.
4
2-2. Outdoor Unit
AVOID:
Exhaust fan
NO
Hot air
G heat sources, exhaust fans, etc. (Fig. 4)
G damp, humid or uneven locations.
Heat source
DO:
Outdoor unit
G choose a place as cool as possible.
G choose a place that is well ventilated.
G allow enough room around the unit for air intake/
exhaust and possible maintenance. (Fig. 5a or 5b)
G provide a solid base (level concrete pad, concrete block,
4" × 1'4" (10 × 40 cm) or 6" × 1'4" (15 × 40 cm) beams
or equal), a minimum of 4" (10 cm) or 6" (15 cm) above
ground level to reduce humidity and protect the unit
against possible water damage and decreased service
life. (Figs. 5c and 5d or 5e)
Fig. 4
Obstacle above
(CH1872)
Min.
7' (2 m)
Min.
7' (2 m)
Air intake
Min. 4" (10 cm) Valve
side
Min. 10"
(25 cm)
A solid base must not cover
CAUTION
Min.
2" (5 cm)
the hole of the bottom plate.
Air discharge
Min.
1'4" (40 cm)
G Install cushion rubber under unit’s feet to reduce
vibration and noise. (Fig. 5f)
G use lug bolts or equal to bolt down unit, reducing
vibration and noise.
Ground
Min. 4" (10 cm)
Air intake
Fig. 5a
G Install in a location where no antenna of a television
or radio exists within 10' (3 m).
Obstacle above
(CH2472)
Anchor bolts
(4 pcs.)
Min.
7' (2 m)
Min.
7' (2 m)
(CH1872)
Air intake
Min. 6" (15 cm) Valve
side
Min. 10"
(25 cm)
Min. 4" (10 cm)
Air intake
Min.
4" (10 cm)
Air discharge
Min.
1'8" (50 cm)
Concrete
or equal
Ground
Min. 6" (15 cm)
Air intake
Fig. 5b
Drain holes
Fig. 5d
Anchor bolts
(4 pcs.)
(CH2472)
Fig. 5c
Min. 6" (15 cm)
Air intake
Concrete
or equal
Cushion rubber
Fig. 5e
Fig. 5f
5
3. How to Install the Indoor Unit
3-1. Remove the Rear Panel from the Unit
(1) Remove and discard the set screw on the rear
panel. (Fig. 6)
(2) Press the 2 L marks on the frame cover and disen-
gage the stationary tabs from the frame. (Fig. 7)
Set screw only for transportation
(3) Remove the rear panel.
Fig. 6
NOTE
Tubing can be extended in 5 directions as shown in Fig.
8. Select the direction you need providing the shortest
run to the outside unit.
Rear panel
G When left tubing is to be done, switch the drain hose
and drain cap. (For details, refer to “Switching drain
hose and drain cap” on page 14.)
3-2. Make a Hole
(1) Place the rear panel from the indoor unit on the wall
at the location selected. Make sure the panel is hori-
zontal, using a carpenter’s level or tape measure to
measure down from the ceiling. Wait until after cut-
ting the hole before attaching the rear panel to the
wall.
marks
Fig. 7
Right-rear
tubing
Left
(recommended)
tubing
(2) Determine which side of the unit you should make
the hole for tubing and wiring. (Fig. 9)
Left-rear
tubing
Right tubing
NOTE
In the case of left-rear tubing, use the measurement
points 2-3/8" (60 mm) from the edge of the rear panel for
precise placement of the hose outlet. (Fig. 9)
Downward tubing
Fig. 8
(3) Before making the hole, check carefully that no
studs or pipes are directly run behind the spot to be
cut.
2-3/8" (60 mm)
Also avoid areas where elec-
CAUTION
trical wiring or conduits are
located.
Fig. 9
The above precautions are also applicable if tubing
goes through the wall in any other location.
6
(4) Using a sabre saw, key hole saw or hole-cutting drill
attachment, cut a hole in the wall. See Table 4 and
Fig. 10.
NOTE
Hole should be made at a slight downward slant to the
outdoor side.
Table 4
Indoor
Outdoor
side
side
Hole Dia.
3-5/32" (80 mm)
(5) Measure the thickness of the wall from the inside
edge to the outside edge and cut PVC pipe at a
slight angle 1/4" (6 mm) shorter than the thickness of
the wall. (Fig. 11)
Fig. 10
PVC pipe (Locally purchased)
(6) Place the plastic cover over the end of the pipe (for
indoor side only) and insert the pipe in the wall. (Fig.
12)
3-3. Install the Rear Panel on the Wall
Cut at slight angle
Be sure to confirm that the wall is strong enough to sus-
pend the unit.
Fig. 11
INSIDE
OUTSIDE
PVC pipe
See either Item a) or b) below depending on the wall type.
Wall
a) If Wooden Wall
Plastic cover
(Locally purchased)
Slight
angle
(1) Attach the rear panel to the wall with the 8 screws
provided. (Fig. 13)
If you are not able to line up the holes in the rear
panel with the beam locations marked on the wall,
use rawl plugs or toggle bolts to go through the
holes on the panel or drill 3/16" (5 mm) dia. holes in
the panel over the stud locations and then mount the
rear panel.
Fig. 12
(2) Double check with a carpenter’s level or tape mea-
sure that the panel is level. This is important to
install the unit properly. (Fig. 14)
Fig. 13
(3) Make sure the panel is flush against the wall. Any
space between the wall and unit will cause noise
and vibration.
b) If Block, Brick, Concrete or Similar Type Wall
Make 3/16" (4.8 mm) dia. holes in the wall. Insert rawl
plugs for appropriate mounting screws. (Fig. 15)
Fig. 14
3/16"
(4.8 mm) dia. hole
Rawl plug
Fig. 15
7
Grille
Air intake grille
3-4. Remove the Grille to Install the Indoor Unit
Basically, these models can be installed and wired with-
out removing the grille. If access to any internal part is
needed, follow the steps as given below.
How to remove the grille
(1) Grasp both ends of the air intake grille, and remove
it by opening towards the front and pulling towards
you. (Fig. 16a)
Fig. 16a
(2) Remove the 3 screws. (Fig. 16b)
(3) Remove the screw on the right side cover plate and
open the cover. (Fig. 17a)
(4) Take out the thermistor from the grille. (Fig. 17b)
Fig. 16b
(5) Press the 3 tabs at the top of the grille and the 3
tabs on the front face to separate the grille from the
frame. (Fig. 18a)
Cover
Thermistor
Thermistor
(6) Pull the grill toward you to remove it.
How to replace the grille
(1) When installing the grille, place the bottom of the
grille into the frame first. (Fig. 18b)
Fig. 17b
Fig. 17a
Tab
Then insert the tabs on the top of the grille and on
the front face into the frame.
(2) Make sure that the grille and frame are firmly fitted
together by engaging the tabs.
(3) Attach the thermistor on the grille. (Fig. 17a)
(4) Close the cover and replace the screw. (Fig. 17a)
Tab
(5) Affix the grille with the 3 previously removed screws.
(Fig. 16b)
Fig. 18a
(6) Install the air intake grille.
(a) Allow the edge of the air intake grille to slide into the
top of the indoor unit, and then insert it all the way
inside. (Fig. 19a)
(b) Press the bottom right and left corners and center of
the air intake grille to attach it to the indoor unit.
(Fig. 19b)
NOTE
Fig. 18b
Groove
Attach so that the round pins at the top right and left cor-
ners of the air intake grille are inserted into the grooves
at the top right and left of the indoor unit.
Pin
Fig. 19b
Fig. 19a
8
3-5. Shape the Indoor Side Tubing
(1) Arrangement of tubing by direction
a) Right or left tubing
Frame
Cut out the corner of the right/left frame with a
hacksaw or the like. (Figs. 20 and 21)
Left tubing
outlet
b) Right-rear or left-rear tubing
In this case, the corner of the frame need not be
cut.
(2) To mount the indoor unit on the rear panel:
Fig. 20
Hang the 2 mounting slots of the unit on the
upper tabs of the rear panel. (Fig. 22)
Frame
3-6. Wiring Instructions
General precautions on wiring
Right tubing
outlet
(1) Before wiring, confirm the rated voltage of the unit as
shown on its nameplate, then carry out the wiring
closely following the wiring diagram.
(2) Provide a power outlet to be used exclusively for
each unit, with a power supply disconnect and cir-
cuit breaker for overcurrent protection provided in
the exclusive line.
Fig. 21
(3) To prevent possible hazards due to insulation failure,
the unit must be grounded.
(4) Each wiring connection must be done tightly and in
accordance with the wiring system diagram. Wrong
wiring may cause the unit to misoperate or become
damaged.
Fig. 22
(5) Do not allow wiring to touch the refrigerant tubing,
compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be
very dangerous. The manufacturer will accept no
responsibility for any damage or misoperation that
occurs as a result of such unauthorized changes.
9
3-7. Recommended Wire Length and Diameter
Regulations on wiring diameter differ from locality to locality. For field wiring
requirements, please refer to your local electrical codes. Carefully observe these
regulations when carrying out the installation.
Table 5 lists recommended wire lengths and diameters for power supply systems.
NOTE
Refer to the wiring system diagram (Fig. 23) for the meaning of (A), (B), and (C) in
Table 5.
Refer to your local codes or in the absence of local codes see the National Elec-
tric Code: ANSI/NFPA70.
Table 5
(A)+(B)
(A) Power Supply Wiring Length (ft)
(B) Power Line Length (ft)
(C) Control
Line Length (ft)
AWG
Fuse or Circuit
Breaker Capacity
Model
(#14)
131 (Max.)
(#12)
(#14)
CH1872, CH2472
230 (Max.)
98 (Max.)
20A
# ... AWG (American Wire Gauge)
WARNING
WIRING SYSTEM DIAGRAM
G Be sure to comply with local codes on running the wire
from the indoor unit to the outdoor unit (size of wire and
wiring method, etc.).
G Each wire must be firmly connected.
G No wire should be allowed to touch refrigerant tubing, the
compressor, or any moving part.
INDOOR
OUTDOOR
UNIT
Disconnect
switch
*
UNIT
Field supply
Terminal
Terminal
(B)
230/208V
1
2
3
1
2
3
4
5
6
230/208V
230/208V
(C)
(A)
L1
L2
Grounding line
WARNING
(B)
Grounding
line
G To avoid the risk of electric shock, each air conditioner
unit must be grounded.
G For the installation of a grounding device, please
observe local electrical codes.
G Grounding is necessary, especially for units using
inverter circuits, in order to release charged electricity
and electrical noise caused by high tension.
Otherwise, electrical shock may occur.
G Place a dedicated ground more than 7' (2 m) away from
other grounds and do not have it shared with other elec-
tric appliances.
Fig. 23
NOTE
*
Disconnect switch may be required by
national or local codes.
CAUTION
Always comply with national and local code
requirements.
CAUTION
G Be sure to connect the power supply line to the outdoor unit as shown in the wiring diagram.
The indoor unit draws its power from the outdoor unit.
G Do not run wiring for antenna, signal, or power lines of television, radio, stereo, telephone,
security system, or intercom any closer than 3'4" (1 m) from the power cable and wires
between the indoor and outdoor units. Electrical noise may affect the operation.
10
3-8. Wiring Instructions for Inter-unit Connections
Rear
panel
Wall
(1) Insert the inter-unit wiring (according to local codes)
into the through-the-wall PVC pipe. Run the wiring
toward the indoor side allowing approx. 10" (25 cm)
to extend from the wall face. (Fig. 24)
Plastic
cover
(2) Grasp both ends of the air intake grille, and remove
it by opening towards the front and pulling towards
you.
Wiring
10"
(25 cm)
(3) Remove the screw on the right side cover plate and
open the cover. (Fig. 25)
Fig. 24
Fig. 25
Fig. 26a
(4) Route the inter-unit wiring from the back of the
indoor unit and pull it toward the front for connec-
tion. (Fig. 26a, 26b)
Cover
(5) Connect the inter-unit wiring to the corresponding
terminals on the terminal plate (Fig. 26a, 26b) while
referring to the wiring diagram.
(6) Be sure to secure the wiring with the provided
clamp.
NOTE
When closing the air intake grille, press the bottom right
and left corners and center. (Fig. 27)
Please refer to “How to replace the grille” on page 8 for
installing the air intake grille.
Terminal
plate
Fig. 27
Inter-unit
wiring
Earth
plate
Lock nut
Top of conduit
connector
Fig. 26b
11
Loose wiring may cause the
terminal to overheat or result
in unit malfunction. A fire
hazard may also exist. There-
fore, be sure all wiring is
tightly connected.
WARNING
When connecting each power wire to the corresponding
terminal, follow the instructions “How to connect wiring
to the terminal” and fasten the wire securely tight with
the fixing screw of the terminal plate.
9/32"
(7 mm)
(ACTUAL
STRIP
SIZE
SIZE)
How to connect wiring to the terminal
a) For Indoor Unit
Fig. 28
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the wire about 9/32" (7 mm).
See the label (Fig. 28) near the terminal plate.
Solid wire
Loop
(2) Using a screwdriver, loosen the terminal screw on
the terminal plate.
(3) Insert the wire and tighten the terminal screw com-
pletely using a screwdriver.
Insulation
b) For Outdoor Unit
Fig. 29
I For solid core wiring (or F-cable)
Stranded wire
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the solid wire about 15/16" (25
mm). (Fig. 29)
Ring
connector
(2) Using a screwdriver, remove the terminal screw(s)
on the terminal plate.
(3) Using the pliers, bend the solid wire to form a loop
suitable for the terminal screw.
Fig. 30
(4) Shape the loop wire properly, place it on the termi-
nal plate and fix it securely with the removed termi-
nal screw using a screwdriver.
Twist wire ends
I For stranded wiring
(1) Cut the wire end with a cutting pliers, then strip the
insulation to expose the stranded wiring about 3/8"
(10 mm) and tightly twist the wire ends. (Figs. 30
and 31)
Fig. 31
(2) Using a screwdriver, remove the terminal screw(s)
on the terminal plate.
Special
washer
Screw
(3) Using a ring connector fastener or pliers, securely
clamp each stripped wire end with a ring connector.
(Fig. 30)
Screw and
special washer
Ring connector
Terminal plate
Ring
connector
Wire
(4) Place the ring connector wire, and replace and
tighten the removed terminal screw using a screw-
driver. (Fig. 32)
Wire
Fig. 32
12
3-9. Mounting
(1) To install the indoor unit, mount the indoor unit onto
the 2 tabs on the upper part of the rear plate.
(2) Hold down the air discharge outlet and press the
lower part of the indoor unit until it clicks to securely
fasten to the 2 tabs on the lower part of the rear
plate. (Fig. 33)
Push
NOTE
For tubing, choose either the right or left tubing direction
and follow the steps below. This work can be made easi-
er by placing padding material (such as styrofoam) at the
rear right side of the indoor unit. (Fig. 34)
Fig. 33
I Right-side tubing
(1) Shape the refrigerant tubing so that it can easily go
into the wall hole. (Fig. 35)
(2) Push the wiring, refrigerant tubing, and drain hose
through the hole in the wall. Adjust the indoor unit so
it is securely seated on the rear panel. (Fig. 36)
Padding material
(3) Carefully bend the tubing (if necessary) to run along
the wall in the direction of the outdoor unit and then
tape as far as the fittings. (See Caution on page
18.) The drain hose should come straight down the
wall to a point where water runoff won’t stain the
wall.
Fig. 34
Rear panel
Cover
Refrigerant
tubing
(4) Connect the refrigerant tubing to the outdoor unit.
(After performing a leak test on the connecting part,
insulate it with the tubing insulation. (Fig. 37a)) Also,
refer to Section 5-4. Connecting Tubing between
Indoor and Outdoor Units.
Inter-unit
wiring
Drain hose
(5) Assemble the refrigerant tubing, drain hose, and
conduit (including inter-unit wiring) as shown in
Fig. 37b.
Fig. 35
Refrigerant tubing
Insulation
Fig. 37a
Conduit
Drain hose
Fig. 36
Inter-unit wiring
Fig. 37b
13
I Left-side tubing
Rear panel
(1) Lead the tubing and drain hose through the wall,
allowing sufficient length for connection. Then bend
the tubing using a tube bender to make the attach-
ment. (Fig. 38)
Hole in wall
Wide tube
Narrow tube
Bent part
(2) Switch the drain hose and drain cap.
Fig. 38
Switching drain hose and drain cap
(a) Locate the drain hose and the drain cap. (Fig.
39)
(b) Remove the screws fastening the drain hose on
the right side, and pull out the drain hose to
remove it. (Fig. 39)
Drain cap
(c) Apply moderate force to pull off the drain cap
on the left side. (If you cannot pull it off by
hand, use a long-nose pliers.)
Drain hose
Fig. 39
(d) Reattach the drain hose to the left side and the
drain cap to the right side. (Fig. 40a)
Drain hose
Drain hose
Slide the drain hose fully onto the drain pan outlet
until the drain hose edge is pushed into the insula-
tion. Check that the screw holes in the drain bracket
and the drain pan outlet are aligned and securely in
contact, then fasten them with the screw. (After
attaching the drain hose, check that it is attached
securely.) (Fig. 40c)
Clamp
Drain cap
Drain cap
Use a Phillips screwdriver to push the drain cap in
firmly. (If it is difficult to push in, wet the cap with
water first.)
Fig. 40a
Screw hole
(3) Install the indoor unit on the rear panel.
(4) Connect the tubing and wiring led inside from out-
doors.
Drain pan outlet
(5) After completing a leak test, bundle the tubing
together with armoring tape and store it inside the
tubing storage area at the back of the indoor unit
and hold it with clamps. (Figs. 40a and 41)
Insulation
Drain bracket
Drain bracket
Screw
Drain hose
Drain hose
Fig. 40c
Fig. 40b
Refrigerant tubing
Inter-unit wiring
Conduit
Fig. 41
14
To unmount indoor unit
Press the 2 L marks on the lower part of the indoor unit
and unlatch the tabs. Then lift the indoor unit and
unmount. (Fig. 42)
3-10. Drain Hose
a) The drain hose should be slanted downward to the
outdoors. (Fig. 43)
b) Never form a trap in the course of the hose.
c) If the drain hose will run in the room, insulate the
hose with insulation* so that chilled condensation
will not damage furniture or floors. (Fig. 44)
Push
* Foamed polyethylene or its equivalent is recom-
Fig. 42
mended.
Do not supply power to the
unit or operate it until all
tubing and wiring to the out-
side unit are completed.
WARNING
Slant
Indoor
unit
Drain
hose
Risk of Electric Shock
Fig. 43
Condensation
Insulation material
(Locally purchased)
must be used.
Fig. 44
15
4. How to Install the Outdoor Unit
First refer to Section 2. Installation Site Selection.
4-1. Wiring Instructions for the Outdoor Unit
Lock nut
Regulations on wire size differ from locality to locality. For
field wiring requirements, please refer to your local elec-
trical codes. Make sure that the installation fully complies
with all local and national regulations.
Cabinet
(1) Remove access panel “C”. (Fig. 46)
Terminal
(2) Connect the inter-unit and power supply line accord-
ing to the drawing on the panel side.
block
(3) Be sure to size each wire allowing approx. 4"
(10 cm) longer than the required length for wiring.
Store excess wiring inside the cabinet.
Conduit
plate
(4) When connections are completed, check that all
connections are correct as shown in the wiring sys-
tem diagram on panel side.
Access panel C
(5) Be sure to ground the unit according to your local
codes.
Inter unit
(Conduit)
Power supply
(Conduit)
Plug
Fig. 46
16
Deburring
5. Refrigerant Tubing
After
Before
5-1. Use of the Flaring Method
Many of the conventional split system air conditioners
employ the flaring method to connect refrigerant tubes
which run between indoor and outdoor units. In this
method, the copper tubes are flared at each end and
connected with flare nuts.
5-2. Flaring Procedure with a Flare Tool
(1) Cut the copper tube to the required length with a
tube cutter. It is recommended to cut approx. 12" to
20" (30 to 50 cm) longer than the tubing length you
estimate.
Fig. 47
Copper
tubing
(2) Remove burrs at the end of the copper tube with a
tube reamer or file. This process is important and
should be done carefully to make a good flare.
(Fig. 47)
Reamer
NOTE
When reaming, hold the tube end downward and be
sure that no copper scraps fall into the tube. (Fig. 48)
Fig. 48
If the previous flare tool
(clutch-type) is used:
If the special R410A
flare tool is used:
(3) Remove the flare nut from the unit and be sure to
mount it on the copper tube.
0.0472" (1.2 mm)
(4) Make a flare at the end of copper tube with a flare
0 to 0.0196"
(0 to 0.5 mm)
tool.* (Figs. 49a and 49b)
Adjust so that the amount of tube
protrusion is as shown in the figure.
(*Use “RIGID” or equivalent.)
Fig. 49a
NOTE
A good flare should have the following characteristics:
G inside surface is glossy and smooth.
G edge is smooth.
Flare nut
Copper
tubing
G tapered sides are of uniform length.
5-3. Caution before Connecting Tubes Tightly
Flare tool
a) Be sure to apply a sealing cap or water-proof tape
to prevent dust or water from getting into the tubes
before they are used.
Fig. 49b
b) Be sure to apply refrigerant lubricant to the match-
ing surfaces of the flare and union before connect-
ing them together. This is effective for reducing gas
leaks. (Fig. 50)
Apply refrigerant
lubricant here and here
Fig. 50
c) For proper connection, align the union tube and
flare tube straight with each other, then screw in the
flare nut lightly at first to obtain a smooth match.
(Fig. 51)
Flare nut
Union
Fig. 51
17
5-4. Connecting Tubing between Indoor and
Outdoor Units
Torque wrench
a) Tightly connect the indoor side refrigerant tubing exten-
ded from the wall with the outdoor side tubing. (Fig. 52)
Spanner
Indoor unit
b) To fasten the flare nuts, apply specified torque as:
Table 6
Outdoor unit
Tube Dia.
Tightening Torque
Fig. 52
1/4" (6.35 mm)
3/8" (9.52 mm)
1/2" (12.70 mm)
5/8" (15.88 mm)
Approx. 120 – 160 lbs·in (140 – 180 kgf·cm)
Approx. 300 – 360 lbs·in (340 – 420 kgf·cm)
Approx. 430 – 540 lbs·in (490 – 610 kgf·cm)
Approx. 590 – 710 lbs·in (680 – 820 kgf·cm)
Insulation
5-5. Insulation of Refrigerant Tubing
IMPORTANT
Fig. 53
To prevent heat loss and wet floors due to dripping of con-
densation, both tubes must be well insulated with a
proper insulation material. (Fig. 53)
The thickness of the insulation should be a minimum 5/16"
(8 mm). (Fig. 54)
Insulation
Thickness:
min. 5/16"
(8 mm)
Min.
5/16"
(8 mm)
5-6. Taping the Tubes
Fig. 54
After a tube has been insulat-
ed, never try to bend it into a
narrow curve, as this may
cause the tube to break or
crack.
CAUTION
(1) At this time, the 2 refrigerant tubes (and electrical wire
if local codes permit) should be taped together with
armoring tape. The drain hose may also be included
and taped together as 1 bundle with the tubing.
Clamp
Insulated tubes
(2) Wrap the armoring tape from the bottom of the outdoor
unit to the top of the tubing where it enters the wall. As
you wrap the tubing, overlap half of each previous tape
turn. (Fig. 55)
Fig. 55
(3) Clamp the tubing bundle to wall, using 1 clamp approx.
every 47" (120 cm).
Apply putty here
NOTE
Do not wind the armoring tape too tightly, since this will
decrease the heat insulation effect. Also, be sure the con-
densation drain hose splits away from the bundle and drips
clear of the unit and the tubing.
Tubing
5-7. Finishing the Installation
Fig. 56
After finishing insulating and taping over the tubing, use
sealing putty to seal off the hole in the wall to prevent rain
and draft from entering. (Fig. 56)
18
6. Air Purging
Indoor unit
Air and moisture remaining in the refrigerant system
have undesirable effects as indicated below. Therefore,
they must be purged completely.
G pressure in the system rises
G operating current rises
G cooling (or heating) efficiency drops
G moisture in the air may freeze and block capillary tubing
Outdoor unit
G water may lead to corrosion of parts in the refrigerant
system
I Air Purging with a Vacuum Pump (for Test Run)
(1) Check that each tube (both narrow and wide tubes)
between the indoor and outdoor units have been
properly connected and all wiring for the test run
has been completed. Note that both narrow and
wide tube service valves on the outdoor unit are
kept closed at this stage.
(2) Using an adjustable wrench or box wrench, remove
the valve caps from the service valve on both nar-
row and wide tubes.
Manifold valve
(Exclusively for R410A)
(3) Connect a vacuum pump and a manifold valve (with
pressure gauges) to the service port on the wide
tube service valve. (Fig. 57)
Lo
Hi
Pressure
gauge
The service port on the wide tube
service valve uses a Schrader core
valve to access the refrigerant sys-
tem. The valve core is similar to
those used in automobile tires.
Therefore, be sure to use a vacuum
hose connector which has a push-
pin inside.
CAUTION
Charging hose
(Exclusively for R410A)
Vacuum pump adapter
(Exclusively for R410A)
(with reverse flow prevention)
Vacuum pump
Be sure to use a manifold valve
for air purging. If it is not avail-
able, use a stop valve (field sup-
ply) for this purpose. The “Hi”
knob of the manifold valve must
always be kept closed.
CAUTION
Fig. 57
NOTE
To prevent other refrigerants from being mistakenly
charged to units which use R410A, the size of the
charge port on the service valve is different from the
one for other refrigerant types. For servicing such as
recharging, the specified charging hose, manifold and
vacuum pump adapter (with reverse flow prevention)
for R410A must be used.
(4) With the “Lo” knob of the manifold valve open, run
the vacuum pump. The operation time for the vacu-
um pump varies with tubing length and the capacity
of the pump. The following table shows the amount
of time for evacuation:
Table 7
Required time for evacuation when
100 liter/h vacuum pump is used
NOTE
If tubing length is
less than 33 ft. (10 m)
If tubing length is
more than 33 ft. (10 m)
The required time in Table 7 is calculated based on the
assumption that the ideal (or target) vacuum condition
is around 10 mmHg abs.
10 min. or more
15 min. or more
19
(5) With the vacuum pump still running, close the “Lo”
knob of the manifold valve. Then stop the vacuum
pump.
90° (1/4 turn)
Narrow tube
(6) With the accessory hex wrench, turn the valve stem
on the narrow tube service valve counter-clockwise
by 90 degrees (1/4 turn) for 10 seconds, and then
turn the stem clockwise to close it again. (Fig. 58)
Hex wrench
Wide tube
Be sure to completely insert
CAUTION
the hex wrench before
attempting to turn the valve.
Valve cap
Vacuum hose to manifold valve
(7) Leak test all joints at the tubing (both indoor and out-
doors) with soapy water. Bubbles indicate a leak. Tight-
en the joint more when leaks, then check if there is no
leak. Be sure to wipe off the soap with a clean cloth.
Fig. 58
(8) With the hex wrench, turn the wide tube service
valve stem counter-clockwise to fully open the valve.
(9) Turn the narrow tube service valve stem counter-
clockwise to fully open the valve.
(10) Loosen the vacuum hose connected to the wide
tube service port slightly to release the pressure.
Then, remove the hose.
This may cause the refriger-
ant gas to leak. In order to
avoid this, take off the hose
quickly.
CAUTION
(11) Fasten the valve cap on the wide tube service port
securely with an adjustable wrench or box wrench.
Next, mount the valve cap on the service valve and
tighten it to 170 lbs·in (200 kgf·cm) with a torque
wrench. This process is very important to prevent
gas from leaking from the system.
(12) Test run the air conditioner. (See next page.)
(13) While the air conditioner is running, apply liquid
soap to check for any gas leaks around the service
valves or caps.
(14) If there is no leakage, stop the air conditioner.
(15) Wipe off the soap on the tubing.
This completes air purging with a vacuum pump and the
air conditioner is ready for actual operation.
20
How to Test Run the Air Conditioner
After turning on power to the air conditioner, use the remote
controller and follow the steps below to conduct the test run.
(1) Set the remote controller in Test Run mode.
(Fig. 59a)
a) Press and hold the ION button.
b) Then press and hold the 1HR TIMER button.
c) At the same time, press the ACL (reset) button once.
Use a pointed object such as the tip of a pen to press
the ACL button.
ON/OFF
operation
button
ION
button
• After a few seconds, “ ” appears and “oP-1” blinks in
the remote controller display area.
(Fig. 59b)
1HR.
TIMER
button
d) Release the 1HR TIMER button.
e) Release the ION button.
(2) Start Cooling mode test run by pressing the ON/OFF
operation button of the remote controller. (Fig. 59a)
• This starts the fan producing uncooled forced air with
the 4 indicator lamps (OPERATION lamp, TIMER
lamp, QUIET lamp, and ION lamp) on the main unit
blinking. (Fig. 59c)
• After 3 minutes, the system shifts into cooling opera-
tion, and cool air will start to be felt. Cool mode test
run is unaffected by the room temperature.
ACL
(Reset)
button
A
(3) Press the ON/OFF operation button of the remote con-
troller again to stop the test run. (Fig. 59a)
Fig. 59a
(4) Finally press the ACL (reset) button of the remote con-
troller to release it from Test Run mode to return to nor-
mal mode. (Fig. 59a)
• “ ” and “oP-1” will disappear from the remote con-
troller display area.
NOTE
Troubleshooting:
In the event that the green “Operation Light” is blinking upon
powering up the system, an error condition exists. In this
case, refer to the self-diagnostics procedure on the
inside of the front cover.
Fig. 59b
IMPORTANT
OPERATION lamp
TIMER lamp
QUIET lamp
ION lamp
After the test run is completed, be sure to press the
ACL (reset) button to return to normal mode. The
air conditioner will not operate correctly if this is not
done.
Fig. 59c
21
I Basic Functions of the Service Valves
The basic functions of the service valves are given in Table 8 below.
Table 8
Narrow Tube Service
Wide Tube Service
Valve (3-Way)
Action
Valve (2-Way)
O-ring
Valve cap
CLOSED
Stem
Shipping
Fully OPEN
Fully OPEN
CLOSED
Operating and
test running
the air conditioner
Measuring pressure
*
and gas charging
* The service port on the wide tube ser-
vice valve uses a Schrader core valve
to access the refrigerant system.
Therefore, be sure to use a hose con-
nector which has a push-pin inside.
(Fig. 60a)
Air purging with
*
a vacuum pump
Service valve
Hose with push-pin
CAUTION
Close
When opening or clos-
ing the service valve
PUSH
Open
stem, use the accessory
hex wrench. Be sure to
fully seat the wrench
Hex
wrench
NOTE
External diameter of service port
R410A: 5/16"
Fig. 60b
before turning the valve.
Fig. 60a
I Pump Down
(2) Using a hex wrench, turn the narrow tube service
valve clockwise all the way to close the service
valve. (Be sure to confirm that the wide tube service
valve is fully open.)
Pump down means collecting all refrigerant gas in the
system back into the outdoor unit without losing any of
the gas. Pump down is used when the unit is to be
moved or before servicing the refrigerant circuit.
(3) Press the operation button and start cooling oper-
ation.
Pump Down Procedure
Be sure to carry out pump down with the unit in
cooling mode.
(4) When the low pressure gauge reading falls to 14.2 to
7.1 psi (1 to 0.5 kg/cm2), fully close the wide tube
valve stem. Then quickly stop the unit.
(1) Connect the Lo side charging hose of the manifold
valve to the service port on the wide tube service
valve.
(5) Disconnect all gauges and hoses, and replace the
valve caps as they were before.
22
7. Remote Control Unit Installation Position
The remote control unit can be operated from either a
non-fixed position or a wall-mounted position.
To ensure that the air conditioner operates correctly, do
not install the remote control unit in the following places:
G In direct sunlight
G Behind a curtain or other place where it is covered
G More than 26' (8 m) away from the air conditioner
G In the path of the air conditioner’s airstream
G Where it may become extremely hot or cold
G Where it may be subject to electrical or magnetic
interference
G Where there is an obstacle between the remote con-
trol unit and the air conditioner (since a check signal
is sent from the remote control unit every 5 minutes)
7-1. Mounting on a Wall
Before mounting the remote control unit, press the
ON/OFF operation button at the mounting location to
make sure that the air conditioner operates from that
location. The indoor unit should make a beeping sound
to indicate that it has received the signal.
Rear side
Remote control unit mount
Press
Mounting screws
5/32 × 5/8" (4 × 16 mm)
(Included)
Hole
Set in
place
To prevent loss of the remote control
unit, you can connect the remote
control unit to the mount by passing
a string through the remote control
unit and attachment hole.
To take out the remote control unit, pull it forward.
Fig. 61
23
8. Address Switch
Tab
8-1. Address Setting of the Remote Control Unit
The address can be set in order to prevent interference
between remote controllers when two Sanyo indoor units
are installed near each other. The address is normally
set to “A.” To set a different address, it is necessary to
change the address on the second remote controller.
Fig. 62
NOTE
Once changed, you cannot restore the original address
setting of the air conditioner.
(1) Switch on the power source.
(2) Break the address-setting tab marked “A” on the
second remote controller to change the address
(Fig. 62). When the tab is removed, the address is
automatically set to B (Fig. 63).
ACL button
(3) Press and hold the remote controller ION button and
1 HR TIMER button. At the same time, press the
ACL(reset) button. Use a thin object such as the tip
of a pen to press the ACL button. When this has
been done, “oP-1” (test run) appears, blinking, in the
remote controller clock display area.
Fig. 63
(4) Each time the 1 HR TIMER button is pressed, the
display changes as shown below. Press this button
2 times to change the display to “oP-7” (address
setting). (Fig. 64)
Test run mode
Selfdiagnostic mode
Address setting mode
ON/OFF
operation
button
ION
button
(5) “oP-7” has now been selected for address setting.
1HR.
(6) Press the ON/OFF operation button on the remote
controller. (Fig. 64) Check that the “beep”signal-
received sound is heard from the second indoor unit
(approximately 5 times). The sound you hear is the
signal that the remote controller address has been
changed.
TIMER
button
(7) Finally press the remote controller ACL (reset) but-
ton to cancel the blinking “oP-7” display.
(Fig. 64)
Changing of the second remote controller address is
now completed.
ACL
(Reset)
button
A
Fig. 64
24
SANYO Commercial Solutions
A Division of SANYO North America Corporation
1300 Michael Drive, Suite A
Wood Dale, IL 60191, U.S.A.
Sanyo Canada Inc.
1-300 Applewood Crescent, Concord, Ontario L4K 5C7, CANADA
Jan. / 2009 (T)
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