SERVICE MANUAL
FILE NO.
XHS2432 / CH2432
XHS3632 / CH3632
Section
SPLIT SYSTEM AIR CONDITIONER
1
INDOOR MODEL No.
PRODUCT CODE No.
OUTDOOR MODEL No.
PRODUCT CODE No.
854 013 42
XHS2432
854 013 40
CH2432
XHS3632
854 015 45
CH3632
854 014 57
Indoor Unit
Outdoor Unit
2
3
4
XHS2432
CH2432
XHS3632
CH3632
85464849176000
REFERENCE NO. SM830076
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WHO SHOULD USE THIS MANUAL
This service manual is made to assist the service technician apply his knowledge and training
to this model air conditioner. This manual is written both for experienced service persons
and those who are new to air conditioning service. To help those with less experience or
who are new to this kind of unit we have included more explanations of basic procedures in
simple language than is usual in some service manuals. The experienced technician will of
course find he knows many of these things already and can go directly to the procedures and
information he needs; the less experienced technician will better understand what to do even
before he arrives on the job, and therefore be better able to work by himself as well as assist
the more experienced technician.
TABLE OF CONTENTS
1. SPECIFICATIONS.........................................................................................................6
1-1 Unit Specifications ................................................................................................7
1-2 Major Component Specifications ........................................................................11
(A)Indoor Unit .....................................................................................................11
(B)Outdoor Unit ..................................................................................................13
1-3 Other Component Specifications ........................................................................15
(A)Indoor Unit .....................................................................................................15
(B)Outdoor Unit ..................................................................................................17
1-4 Dimensional Data................................................................................................19
(A)Indoor Unit .....................................................................................................19
(B)Outdoor Unit ..................................................................................................21
1-5 Refrigerant Flow Diagram ...................................................................................23
1-6 Operating Range.................................................................................................23
2. PROCESSES AND FUNCTIONS ................................................................................25
2-1 Room Temperature Control ................................................................................26
(A)Cooling ..........................................................................................................26
(B)Heating ..........................................................................................................27
2-2 Cold Draft Prevention (Heating Cycle) ................................................................28
2-3 Automatic Fan Speed (Indoor Unit).....................................................................29
(A)Cooling ..........................................................................................................29
(B)Heating ..........................................................................................................29
2-4 Outdoor Fan Speed Control ................................................................................30
(A)Cooling ..........................................................................................................30
(B)Heating ..........................................................................................................30
2-5 Freeze Prevention (Cooling) ...............................................................................31
2-6 Condensing Temperature Control (Cooling) ...................................................... 32
2-7 Overload Protection (Heating).............................................................................33
2-8 Discharge Temperature Control (Cooling and Heating) ..................................... 34
SM830076
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– 3 –
2-9 Auto. Mode for Automatic Heating/Cooling Switching........................................ 35
2-10 Defrosting Control, Outdoor Heat Exchanger Coil (Heating).............................. 37
2-11 4-Way Valve, Solenoid Control ...........................................................................38
(A)Normal Control Mode ....................................................................................38
(B)AUTO Control Mode ......................................................................................39
2-12 Automatic Restart after Power Interruption ........................................................ 39
2-13 Electronic Expansion Valve ................................................................................40
2-14 Compressor Discharge Gas Temperature ......................................................... 40
(A)Cooling ..........................................................................................................40
(B)Heating (Except During Defrosting) ...............................................................40
2-15 Compressor Current Detection Circuit ................................................................41
2-16 Electronic Expansion Valve Control ....................................................................42
2-17 Voltage Detection Control ...................................................................................43
3. ELECTRICAL DATA....................................................................................................45
3-1 Indoor Unit (Electric Wiring Diagram, Schematic Diagram) ............................... 46
3-2 Outdoor Unit (Electric Wiring Diagram, Schematic Diagram)............................. 48
4. SERVICE PROCEDURES ...........................................................................................53
4-1 Troubleshooting ..................................................................................................54
4-2 Checking the Electrical Components ..................................................................87
SM830076
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Introduction: Read Me First!
This manual will help you understandWandHseArvTice tIhSe aiIrNconTditHionIeSr. ToMheAlpNyouUfiAndLthe information you need,
we have divided it into 5 main sections. Each section is divided into chapters with charts, tables and explana-
tions to help you find and repair problems.
❑
❑
Section 1: Specifications, tells you about the physical and electrical make up of the unit, as well
as its heating and cooling capacities. Look in this section to find the correct values for
components and functions.
Section 2: Processes and Functions, explains each different part of the cooling and heating
cycle, and how each control function reacts to changing conditions to keep the room at the set
temperature range.
❑
❑
Section 3: Electrical Data, which has fold-out schematic and wiring diagrams so you can find
the parts you need to check when something is wrong, and see how they should be connected.
Section 4: Service Procedures, has two main parts, a diagnostic chapter to help you find the
specific component to replace or adjust, and a chapter with specific procedures and values to
guide you in checking the electrical components in the unit.
HOW TO USE THIS MANUAL
You can use this manual both as a reference to find specific information about the capacity, functions and
construction of this unit, and as a source of information to help you set up and maintain the unit.
When this unit is not working properly, and the cause is not known, you can use the procedures in
Section 3: Servicing Procedures to find the problem, fix it, and restore the unit to its proper functioning.
This air conditioner has many helpful self diagnostic features to help you identify problem areas quickly.
So you will be ready when a problem happens, we suggest you look this manual over and become familiar with it
by following these steps:
1.
2.
Look at the TABLE OF CONTENTS to get an idea of what is in this manual and where to find it.
Look at the chapter about TROUBLE SHOOTING, so you are familiar with the way the flow
charts work. They are designed to guide you quickly through the possible causes for each kind of
problem that is likely to happen to the Unit. Particularly read the introduction to this section, and
the parts about the self-diagnosis and error codes which show on the display.
3.
4.
Look at the chapter about CHECKING ELECTRICAL COMPONENTS. You already know
about most of these procedures. This chapter gives you the specific values and methods for
these components. If you don’t know some of these procedures, you can easily learn them here.
Read the Instruction Manual! The Instruction Manual is included here because it helps you help
the user to set the temperature controls properly and know how to take care of any simple
problems that may happen, as well as know when to call for service. The Instruction Manual also
has illustrations, care, and installation information not found in the rest of the service manual. It is
short, and if you read it carefully, you will be able to answer the customers questions easily, and
also know the most efficient ways for setting times and temperatures.
Please use this manual to make your work easier, keep the air conditioner functioning well, and keep your
customers satisfied.
SM830076
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– 5 –
1. SPECIFICATIONS
1-1 Unit Specifications ...........................................................................................7
1-2 Major Component Specifications .................................................................. 11
(A)Indoor Unit ................................................................................................11
(B)Outdoor Unit .............................................................................................13
1-3 Other Component Specifications .................................................................. 15
(A)Indoor Unit ................................................................................................15
(B)Outdoor Unit .............................................................................................17
1-4 Dimensional Data...........................................................................................19
(A)Indoor Unit ................................................................................................19
(B)Outdoor Unit .............................................................................................21
1-5 Refrigerant Flow Diagram ............................................................................. 23
1-6 Operating Range............................................................................................23
1
SM830076
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– 6 –
1. Specifications
1-1 Unit Specifications
MODEL No.
Indoor Unit
XHS2432
CH2432
Outdoor Unit
POWER SOURCE
PERFORMANCE
Capacity*
230 - 208 V / 1 Phase / 60 Hz
Cooling
Heating
BTU / h
24,000
8.6
23,400
8.4
25,000
16,400
24,300
15,800
(17°F)**
Moisture removal (High)
Air circulation (Hi)
Pints / h
cu.ft. / min.
BTU / Wh
—
540 / 510
S.E.E.R. (H.S.P.F.)
ELECTRICAL RATINGS
Voltage rating
10.0
230
10.2
208
(7.0)
230
(7.0)
208
VAC
VAC
A
Available voltage range
Running amperes
187 - 253
187 - 253
1
11.2
—
11.6
—
11.7
—
12.3
—
Max. running amperes
Power input*
A
W
2,450
2,350
2,500
2,150
2,450
2,020
(17°F)**
Buck-up heater
Maximum fuse size
FEATURES
kW
A
—
—
—
—
30
Microprocessor
Controls
Fan speeds Indoor / Outdoor
Timer
3 and Automatic control / 2 (Auto)
ON / OFF 24-hours & Program
— / Automatic
Air deflection
Air filter
Horizontal / Vertical
dB - A
Washable, easy access, long life fiter (2,500 hr)
Operation sound
Hi / Me / Lo
Indoor
Outdoor - Hi
37 / 35 / 31
53
dB - A
Refrigerant control
Electronic Refrigerant Control Valve
REFRIGERANT PIPING
Limit of piping length
ft. (m)
ft. (m)
ft. (m)
165 (50)
100 (30)
Limit of piping length at shipment
Limit of elevation difference
between the two units
Outdoor unit is higher than indoor unit: 165 (50)
Outdoor unit is lower than indoor unit: 100 (30)
Refrigerant piping
Flare type
Narrow pipe
Wide pipe
in. (mm)
in. (mm)
1 / 4 (6.35)
3 / 4 (19.05)
SM830076
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– 7 –
1. Specifications
1-1 Unit Specifications
DIMENSIONS & WEIGHT
Indoor unit
9-27/32
Outdoor unit
Unit dimensions
Height
in. (mm)
in. (mm)
in. (mm)
lbs. (kg)
in. (mm)
in. (mm)
in. (mm)
lbs. (kg)
in. (mm)
in. (mm)
in. (mm)
lbs. (kg)
cu.ft. (m3)
in. (mm)
in. (mm)
in. (mm)
lbs. (kg)
cu.ft. (m3)
(250)
(760)
(760)
(22)
28-30/32
(735)
(940)
(340)
(71)
Width
Depth
29-29/32
29-29/32
49
37
13-12/32
157
Net weight
Indoor grille dimensions
PNR-XHS2432
Height
Width
Depth
3-1/16
33-27/32
33-27/32
11
(78)
(860)
(860)
(5)
Net weight
Indoor / Outdoor unit
Package dimensions
Height
Width
Depth
11-6/32
32-14/32
32-25/32
60
(284)
(824)
(833)
(27)
32-17/32
40
(826)
(1,016)
(416)
16-12/32
170
1
Shipping weight
Shipping volume
Indoor grille
(77)
6.9
(0.195)
(104)
(967)
(999)
(8)
12.3
(0.349)
Height
Width
Depth
4-3/32
38-2/32
39-11/32
18
Package dimensions
PNR-XHS2432
Shipping weight
Shipping volume
3.5
(0.100)
DATA SUBJECT TO CHANGE WITHOUT NOTICE
Cooling :
Rating conditions (*)
Heating :
Rating conditions (*)
: Room temperature 80 °F DB / 67 °F WB, Ambient temperature 95 °F DB / 75 °F WB
: Room temperature 70 °F DB / 60 °F WB, Ambient temperature 47 °F DB / 43 °F WB
Low temp conditions (**) : Room temperature 70 °F DB / 60 °F WB, Ambient temperature 17 °F DB / 15 °F WB
SM830076
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– 8 –
1. Specifications
1-1 Unit Specifications
MODEL No.
Indoor Unit
XHS3632
CH3632
Outdoor Unit
POWER SOURCE
PERFORMANCE
Capacity*
230 - 208 VAC / 1 Phase / 60 Hz
Cooling
Heating
BTU / h
34,500
11.1
33,500
11.1
37,500
25,000
36,500
23,500
(17°F)**
Moisture removal (High)
Air circulation (Hi)
Pints / h
cu.ft. / min.
BTU / Wh
—
980 / 880
S.E.E.R. (H.S.P.F.)
ELECTRICAL RATINGS
Voltage rating
10.7
230
11.0
208
(7.0)
230
(7.0)
208
VAC
VAC
A
Available voltage range
Running amperes
187 - 253
187 - 253
1
15.4
—
15.8
—
18.2
—
19.3
—
Max. running amperes
Power input*
A
W
3,350
3,200
3,850
3,150
3,750
2,950
(17°F)**
Buck-up heater
Maximum fuse size
FEATURES
kW
A
—
—
—
—
30
Microprocessor
Controls
Fan speeds Indoor / Outdoor
Timer
3 and Automatic control / 2 (Auto)
ON / OFF 24-hours & Program
— / Automatic
Air deflection
Air filter
Horizontal / Vertical
dB - A
Washable, easy access, long life fiter (2,500 hr)
Operation sound
Hi / Me / Lo
Indoor
Outdoor - Hi
43 / 40 / 36
56
dB - A
Refrigerant control
Electronic Refrigerant Control Valve
REFRIGERANT PIPING
Limit of piping length
ft. (m)
ft. (m)
ft. (m)
165 (50)
100 (30)
Limit of piping length at shipment
Limit of elevation difference
between the two units
Outdoor unit is higher than indoor unit: 165 (50)
Outdoor unit is lower than indoor unit: 100 (30)
Refrigerant piping
Flare type
Narrow pipe
Wide pipe
in. (mm)
in. (mm)
3 / 8 (9.52)
3 / 4 (19.05)
SM830076
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– 9 –
1. Specifications
1-1 Unit Specifications
DIMENSIONS & WEIGHT
Indoor unit
11-1/32
Outdoor unit
Unit dimensions
Height
in. (mm)
in. (mm)
in. (mm)
lbs. (kg)
in. (mm)
in. (mm)
in. (mm)
lbs. (kg)
in. (mm)
in. (mm)
in. (mm)
lbs. (kg)
cu.ft. (m3)
in. (mm)
in. (mm)
in. (mm)
lbs. (kg)
cu.ft. (m3)
(280)
(1,050)
(760)
(27)
48-20/32
(1,235)
(940)
(340)
(92)
Width
Depth
41-11/32
29-29/32
60
37
13-12/32
203
Net weight
Indoor grille dimensions
PNR-XHS3632
Height
Width
Depth
3-1/6
(78)
33-27/32
33-27/32
15
(1,150)
(860)
(7)
Net weight
Indoor / Outdoor unit
Package dimensions
Height
Width
Depth
12-14/32
43-27/32
32-25/32
71
(316)
(1,114)
(833)
(32)
52-7/32
40
(1,326)
(1,016)
(416)
16-12/32
227
1
Shipping weight
Shipping volume
Indoor grille
(103)
10.3
(0.293)
(104)
(1,257)
(999)
(13)
19.8
(0.56)
Height
Width
Depth
4-3/32
49-16/32
39-11/32
29
Package dimensions
PNR-XHS3632
Shipping weight
Shipping volume
4.6
(0.131)
DATA SUBJECT TO CHANGE WITHOUT NOTICE
Cooling :
Rating conditions (*)
Heating :
Rating conditions (*)
: Room temperature 80 °F DB / 67 °F WB, Ambient temperature 95 °F DB / 75 °F WB
: Room temperature 70 °F DB / 60 °F WB, Ambient temperature 47 °F DB / 43 °F WB
Low temp conditions (**) : Room temperature 70 °F DB / 60 °F WB, Ambient temperature 17 °F DB / 15 °F WB
SM830076
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– 10 –
1. Specifications
1-2 Major Component Specifications
(A) Indoor Unit
MODEL No.
XHS2432
Source
230 - 208 VAC / 1 phase / 60 Hz
RCS - 5HPS4U
Remote controller (Accessory)
Controller P. C. B Ass'y
Control circuit fuse
Controller Ass'y
CR - THS2432
250 VAC, 3 A
CR - 3XHS
Fan (Number … diameter)
Fan motor
in.
(mm)
Turbo (1…19-9/32 (490))
Model
SFG6X - 41A5P
1
Source
230 - 208 V / 1 phase / 60 Hz
No. of pole … r.p.m. (230 V, High)
Nominal output
rpm
W
6 … 451
40
Coil resistance
Ω
BRW - WHT
WHT - VLT
VLT - ORG
:
:
:
114.0
23.9
12.4
,
,
,
ORG - YEL
WHT - PNK
YEL - BLK
:
:
:
66.4
77.4
82.1
(Ambient temperature 68 °F)
Safety device
Operating temperature
Open
Close
VAC,
°F
°F
266 ± 14.4
174.2 ± 27
440 V , 4 µF
Run capacitor
Electronic expansion valve
Coil
µF
DKV - MOZS582E0
Coil resistance (at 20°C)
Ω
ORG - GRY
RED - GRY
:
:
46
46
,
,
YEL - GRY
BLK - GRY
:
:
46
46
Valve body
IKV - 24D12
Heat exchanger
Coil
Aluminum plate fin / Copper tube
2 … 14.9
Rows … Fins per inch
Face area
ft.2
(m2)
3.18 (0.295)
Panel
Model No.
PNR - XHS2432
IND - 3THS
Indicator Lamp Ass'y
Auto louver motor
Auto louver motor … Rated
Coil resistance (Ambient temperature 77 °F)
MT8 - 3C
V, W, rpm
240 VAC , 3 W , 3 rpm
16.430 Ω ± 8 %
Ω
DATA SUBJECT TO CHANGE WITHOUT NOTICE
SM830076
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– 11 –
1. Specifications
1-2 Major Component Specifications
(A) Indoor Unit
MODEL No.
XHS3632
Source
230 - 208 VAC / 1 phase / 60 Hz
RCS - 5HPS4U
Remote controller (Accessory)
Controller P. C. B Ass'y
Control circuit fuse
Controller Ass'y
CR - THS2432
250 VAC, 3 A
CR - 3XHS
Fan (Number … diameter)
Fan motor
in.
(mm)
Turbo (1…19-9/32 (490))
Model
SFG6X - 61A3P
1
Source
230 - 208 V / 1 phase / 60 Hz
No. of pole … r.p.m. (230 V, High)
Nominal output
rpm
W
6 … 560
60
Coil resistance
Ω
BRW - WHT
WHT - VLT
VLT - ORG
:
:
:
71.1
8.7
,
,
,
ORG - YEL
VLT - PNK
YEL - BLK
:
:
:
22.7
43.2
54.32
(Ambient temperature 68 °F)
13.3
Safety device
Operating temperature
Open
Close
VAC,
°F
°F
266 ± 14.4
174.2 ± 27
440 V , 6 µF
Run capacitor
Electronic expansion valve
Coil
µF
EKV - MOZS584E0
Coil resistance (at 20°C)
Ω
ORG - GRY
RED - GRY
:
:
46
46
,
,
YEL - GRY
BLK - GRY
:
:
46
46
Valve body
HKV - 30D16
Heat exchanger
Coil
Aluminum plate fin / Copper tube
2 … 14.9
Rows … Fins per inch
Face area
ft.2
(m2)
5.17 (0.48)
Panel
Model No.
PNR - XHS3632
IND - 3THS
Indicator Lamp Ass'y
Auto louver motor
Auto louver motor … Rated
Coil resistance (Ambient temperature 77 °F)
MT8 - 3C
V, W, rpm
240 VAC , 3 W , 3 rpm
16.430 Ω ± 8 %
Ω
DATA SUBJECT TO CHANGE WITHOUT NOTICE
SM830076
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– 12 –
1. Specifications
1-2 Major Component Specifications
(B) Outdoor Unit
MODEL No.
CH2432
Source
230 - 208 VAC / 1 phase / 60 Hz
CR - CH2432 (Microprocessor)
250 VAC, 3 A
Controller P.C.B. Ass'y
Control circuit fuse
Compressor
Rotary (Hermetic)
C - 2R160H6T
Model
Source
230 - 208 VAC / 1 phase / 60 Hz
1,700
Nominal output
W
cc
Ω
Compressor oil
800
1
Coil resistance (Ambient temperature 77 °F)
Safety device
C – R : 0.885 , C – S : 1.773
Internal type
Overload relay models
—
Operating temperature
Open
Close
°F
°F
297 ±
9
198 ± 20
—
Operating ampere (at 77 °F)
Run capacitor
A
VAC,
VAC,
lbs.
µF
W
400 VAC, 40 µF
230 VAC, 30 W
R22 : 6.17 (2.8)
Crank case heater
Refrigerant amount charged at shipment
High pressure switch
Set pressure
(kg)
-
ACB 1UB11
+ 28.44
+ 2.0
OFF lb/in2 (kg/cm2)
ON lb/in2 (kg/cm2)
426.6
(30
+ 0.5
)
+
7.11
341.3 ± 28.44 (24 ± 2.0)
Propeller
Fan
Number...diameter
Fan speeds
Fan motor
in.
(mm)
1 ... 18 - 3/32 (460)
2 (AUTO)
Model
KFC6T - 91D6P
Source
230 - 208 VAC / 1 phase / 60 Hz
No. of pole ..... rpm (230 V, High)
Nominal output
6 ... 879
110
W
Coil resistance
(Ambient temperature 68 °F)
Ω
BRN – WHT
WHT – VLT
:
:
67.14 , VLT – YEL : 11.42
64.85 , YEL – PNK : 10.60
Safety device
Internal type
Operating temperature
Open
Close
VAC,
°F
°F
µF
248 ±
9
171 ± 27
Run capacitor
Heat exchange
Coil
440 VAC, 4 µF
Aluminum plate fin / Copper tube
Rows ..... Fins per inch
Face area
2 ... 14.1
ft.2
(m2)
6.78 (0.63)
DATA SUBJECT TO CHANGE WITHOUT NOTICE
SM830076
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– 13 –
1. Specifications
1-2 Major Component Specifications
(B) Outdoor Unit
MODEL No.
CH3632
Source
230 - 208 VAC / 1 phase / 60 Hz
CR - CH2432 (Microprocessor)
250 V, 3 A
Controller P.C.B. Ass'y
Control circuit fuse
Compressor
Rotary (Hermetic)
C - R221H6R
Model
Source
230 - 208 VAC / 1 phase / 60 Hz
2,200
Nominal output
W
cc
Ω
Compressor oil
1,500
1
Coil resistance (Ambient temperature 77 °F)
Safety device
C – R : 0.549 , C – S : 1.525
Internal type
Overload relay models
—
Operating temperature
Open
Close
°F
°F
320 ±
9
189 ± 20
—
Operating ampere (at 77 °F)
Run capacitor
A
VAC,
VAC,
lbs.
µF
W
400 VAC, 40 µF
230 VAC, 30 W
R22 : 8.82 (4.0)
Crank case heater
Refrigerant amount charged at shipment
High pressure switch
Set pressure
(kg)
-
ACB 1UB11
+ 28.44
+ 2.0
OFF lb/in2 (kg/cm2)
ON lb/in2 (kg/cm2)
426.6
(30
+ 0.5
)
+
7.11
341.3 ± 28.44 (24 ± 2.0)
Propeller
Fan
Number...diameter
Fan speeds
Fan motor
in.
(mm)
2 ... 18 - 3/32 (460)
2 (AUTO)
Model
KFC6T - 91D6P × 2
230 - 208 V / 1 phase / 60 Hz
6 ... 879
Source
No. of pole ..... rpm (230 V, High)
Nominal output
W
110 × 2
Coil resistance
(Ambient temperature 68 °F)
Ω
BRN – WHT
WHT – VLT
:
:
67.14 , VLT – YEL : 11.42
64.85 , YEL – PNK : 10.60
Safety device
Internal type
Operating temperature
Open
Close
VAC,
°F
°F
µF
248 ±
9
171 ± 27
Run capacitor
Heat exchange
Coil
440 VAC, 4 µF × 2
Aluminum plate fin / Copper tube
Rows ..... Fins per inch
Face area
2 ... 14.1
ft.2
(m2)
11.63 (1.08)
DATA SUBJECT TO CHANGE WITHOUT NOTICE
SM830076
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– 14 –
1. Specifications
1-3 Other Component Specifications
(A) Indoor Unit
MODEL No.
XHS2432
ATR – II174B
Power Transformer
Rated
Primary
220 VAC, 60 Hz
Secondary
Capacity
14.8 VAC 0.55 mA, 14.8 VAC 0.6 mA
—
Coil resistance
(Ambient temprature 77 °F)
Ω
WHT - WHT
:
101
,
BRN - BRN
:
0.42
Thermistor cut off temperature
Thermistor (Coil sensor) : TH2, 3
Coil resistance
°F
277
PBC - 41E - S26
kΩ
14 °F : 23.7
23 °F : 18.8
32 °F : 15.0
,
,
,
41 °F : 12.1
50 °F : 9.7
59 °F : 8.0
1
Thermistor (Room sensor) : TH1
KTEC - 35 - S6
Coil resistance
kΩ
32 °F : 16.5
41 °F : 12.8
50 °F : 10.0
68 °F : 6.3
86 °F : 4.0
,
,
,
,
,
104 °F : 2.7
113 °F : 2.2
122 °F : 1.8
131 °F : 1.5
Drain pump
WP20SL - 21
Rated
230 / 208 VAC, 12.5 W
FS - 0218 - 102
Float switch
MAX Rated (Contact rated)
Solenoid control valve or coil
Solenoid control valve
Solenoid coil
50 W, DC 5V, 0.1 mA
IKV - 24D12
DKV - MOZS582E0
IND - 3THS
Indicator Lamp Ass'y
Synchronized Motor
MT8 - 3C
SM830076
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– 15 –
1. Specifications
1-3 Other Component Specifications
(A) Indoor Unit
MODEL No.
XHS3632
ATR – II174B
Power Transformer
Rated
Primary
220 VAC, 60 Hz
Secondary
Capacity
14.8 VAC 0.55 mA, 14.8 VAC 0.6 mA
—
Coil resistance
(Ambient temprature 77 °F)
Ω
WHT - WHT
:
101
,
BRN - BRN
:
0.42
Thermistor cut off temperature
Thermistor (Coil sensor) : TH2, 3
Coil resistance
°F
277
PBC - 41E - S36
kΩ
14 °F : 23.7
23 °F : 18.8
32 °F : 15.0
,
,
,
41 °F : 12.1
50 °F : 9.7
59 °F : 8.0
1
Thermistor (Room sensor) : TH1
KTEC - 35 - S6
Coil resistance
kΩ
32 °F : 16.5
41 °F : 12.8
50 °F : 10.0
68 °F : 6.3
86 °F : 4.0
,
,
,
,
,
104 °F : 2.7
113 °F : 2.2
122 °F : 1.8
131 °F : 1.5
Drain pump
WP20SL - 21
Rated
230 / 208 VAC, 12.5 W
FS - 0218 - 103
Float switch
MAX Rated (Contact rated)
Solenoid control valve or coil
Solenoid control valve
Solenoid coil
50 W, DC 5V, 0.1 mA
HKV - 30D16
EKV - MOZS728E0
IND - 3THS
Indicator Lamp Ass'y
Synchronized Motor
MT8 - 3C
DATA SUBJECT TO CHANGE WITHOUT NOTICE
SM830076
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– 16 –
1. Specifications
1-3 Other Component Specifications
(B) Outdoor Unit
MODEL No.
CH2432
FMCA - 1UL
240 VAC, 60 Hz
580 ± 15 %
230 VAC, 20 A
230 VAC, 3 A
HH62S
Compressor Motor Magnetic Contactor
Coil rated
Coil resistance (at 77 °F)
Contact rated (Main)
Ω
Contact rated (Auxiliary)
Power Relay
Coil rated
240 VAC, 60 Hz
17.2
Coil resistance (at 77 °F)
Contact rated
kΩ
1
220 VAC, 5 A
ATR - I65C
Power Transformer
Rated
Primary
220 VAC, 60 Hz
14 V, 0.4 A
5.6 VA
Secondary
Capacity
Coil resistance (at 73 °F )
Thermal cut off temperature
Thermistor (Coil sensor) : TH6, 7
Coil resistance
Ω
WHT – WHT : 395.5
,
266
,
BRN – BRN : 2.19
°F
PBC - 41E - S4
14 °F : 23.7
23 °F : 18.8
32 °F : 15.0
41 °F : 12.1
PBC - 41E - S26
kΩ
,
,
,
,
50 °F : 9.7
68 °F : 6.5
86 °F : 4.4
104 °F : 3.1
113 °F : 2.6
Thermistor (Comp. discharge gas sensor) : TH8
PTC - 51H - S1
Coil resistance
kΩ
140 °F : 13.8
158 °F : 9.7
167 °F : 8.2
176 °F : 7.0
185 °F : 5.9
,
,
,
,
,
194 °F : 5.1
212 °F : 3.8
230 °F : 2.8
248 °F : 2.2
266 °F : 1.7
Solenoid control valve or coil
Solenoid control valve
Solenoid coil
V 389100
LB 59005
Thermistor (PTC)
Rated
TDK – 101YV
Max. voltage
400 VAC
Max. ampere
11.5 A
+ 30
– 20
Resistance (at 77 °F)
Ω
100
%
DATA SUBJECT TO CHANGE WITHOUT NOTICE
SM830076
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– 17 –
1. Specifications
1-3 Other Component Specifications
(B) Outdoor Unit
MODEL No.
CH3632
FMCA - 1SUL
240 VAC, 60 Hz
588 ± 10 %
240 VAC, 26 A
240 VAC, 3 A
HH62S
Compressor Motor Magnetic Contactor
Coil rated
Coil resistance (at 68 °F)
Contact rated (Main)
Ω
Contact rated (Auxiliary)
Power Relay
Coil rated
240 VAC, 60 Hz
17.2
Coil resistance (at 77 °F)
Contact rated
kΩ
1
220 VAC, 5 A
ATR - I65C
Power Transformer
Rated
Primary
220 VAC, 60 Hz
14 V, 0.4 A
5.6 VA
Secondary
Capacity
Coil resistance (at 73 °F )
Thermal cut off temperature
Thermistor (Coil sensor) : TH6, 7
Coil resistance
Ω
WHT – WHT : 395.5
,
266
,
BRN – BRN : 2.19
°F
PBC - 41E - S4
14 °F : 23.7
23 °F : 18.8
32 °F : 15.0
41 °F : 12.1
PBC - 41E - S36
kΩ
,
,
,
,
50 °F : 9.7
68 °F : 6.5
86 °F : 4.4
104 °F : 3.1
113 °F : 2.6
Thermistor (Comp. discharge gas sensor) : TH8
PTC - 51H - S1
Coil resistance
kΩ
140 °F : 13.8
158 °F : 9.7
167 °F : 8.2
176 °F : 7.0
185 °F : 5.9
,
,
,
,
,
194 °F : 5.1
212 °F : 3.8
230 °F : 2.8
248 °F : 2.2
266 °F : 1.7
Solenoid control valve or coil
Solenoid control valve
Solenoid coil
V 389100
LB 59005
Thermistor (PTC)
Rated
TDK – 101YV
Max. voltage
400 VAC
Max. ampere
11.5 A
+ 30
– 20
Resistance (at 77 °F)
Ω
100
%
DATA SUBJECT TO CHANGE WITHOUT NOTICE
SM830076
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– 18 –
1. Specifications
1-4 Dimensional Data
(A) Indoor Unit: XHS2432
8-21/32
8-1/16
4-29/32
• Remote controller (Accessory)
1
2-13/32
23/32
4-29/32
5-29/32
7-7/8
10-1/32
32-9/32 (Ceiling opening)
11-23/32
8-1/16
6-1/2
1-3/16
33-27/32
19-11/16
23-7/32 (Suspention bolt pitch)
14
1-7/8
4-29/32
Min. 2-3/8
3-1/32
Dimension : inch
Air intake
Air outlet
Narrow tube (1/4")
Wide tube (3/4")
Drain connection
Power line (conduit size : 1/2")
For discharge duct
Suspention bolt mounting
1024_X_S
SM830076
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– 19 –
1. Specifications
1-4 Dimensional Data
(A) Indoor Unit: XHS3632
8-19/32
8-9/32
2-3/8
1
2-3/4
2-13/32
6-1/2
11-7/32
32-9/32 (Ceiling opening)
12-29/32
8-19/32
1-3/16
33-27/32
19-11/16
23-7/32 (Suspention bolt pitch)
4-29/32
13-15/32
19/32
1-7/8
8-9/32
Dimension : inch
Air intake grille
Air outlet
Refrigerant liquid line (ø3/8")
Refrigerant gas line (ø3/4")
Drain connection
Power supply entry
For discharge duct
Humidifier (option) mounting hole
Suspension bolt mounting
1346_X_S
SM830076
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– 20 –
1. Specifications
1-4 Dimensional Data
(B) Outdoor Unit: CH2432
6-11/16
26
4-21/64
1-31/32
1-31/32
1
37
Dimension : inch
Hole for anchor bolt (4-ø1/2)
Refrigerant tube joint (narrow tube)
Flare connection 1/4 in (6.35 mm)
Refrigerant tube joint (wide tube)
Flare connection 3/4 in (19.05 mm)
Refrigerant tubing inlet
Power supply inlet
1131_THS_I
SM830076
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– 21 –
1. Specifications
1-4 Dimensional Data
(B) Outdoor Unit: CH3632
6-11/16
26
4-21/64
1-31/32
1-31/32
1
37
Dimension : inch
Hole for anchor bolt (4-ø13)
Refrigerant tube joint (narrow tube)
Flare connection 3/8 in (9.52 mm)
Refrigerant tube joint (wide tube)
Flare connection 3/4 in (19.05 mm)
Refrigerant tubing inlet
Power supply inlet
1581_C_S
SM830076
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– 22 –
1. Specifications
1-5 Refrigerant Flow Diagram
Outdoor Unit: CH2432
Indoor Unit: XHS2432
Compressor
Accumulator
Accumulator
Gas line
service
valve
Gas line
nipple
O.D.
3/4"
(19.05mm)
HP
High
pressure
switch
Muffler
4-way valve
1
EC
P
Heat exchanger
EC
Heat exchanger
Distributor
Strainer
P
Electronic
ref.control
valve
Distributor
Liquid line
service
valve
M
Liquid line
nipple
O.D.
1/4"
(6.35mm)
Strainer
Sub-heat exchanger
Cooling Cycle
Heating Cycle
1132_THS_I
1-6 Operating Range
Temperature
Maximum
Minimum
Indoor Air Intake
Outdoor Air Intake
95 °F DB, 71 °F WB 115 °F DB
67 °F DB, 57 °F WB 23 °F DB
Cooling
Heating
Maximum
Minimum
80 °F DB, 67 °F WB 75 °F DB, 65 °F WB
-DB / -WB
17 °F DB / 15 °F WB
SM830076
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– 23 –
1. Specifications
1-5 Refrigerant Flow Diagram
Outdoor Unit: CH3632
Indoor Unit: XHS3632
Compressor
Accumulator
Accumulator
Gas line
service
valve
Gas line
nipple
O.D.
3/4"
(19.05mm)
HP
High
pressure
switch
Muffler
4-way valve
1
EC
P
Heat exchanger
EC
Heat exchanger
Distributor
Strainer
P
Electronic
ref.control
valve
Distributor
Liquid line
service
valve
M
Liquid line
nipple
O.D.
3/8"
(9.52mm)
Strainer
Sub-heat exchanger
Cooling Cycle
Heating Cycle
1398_THS_I
1-6 Operating Range
Temperature
Maximum
Minimum
Indoor Air Intake
Outdoor Air Intake
95 °F DB, 71 °F WB 115 °F DB
67 °F DB, 57 °F WB 23 °F DB
Cooling
Heating
Maximum
Minimum
80 °F DB, 67 °F WB 75 °F DB, 65 °F WB
-DB / -WB
17 °F DB / 15 °F WB
SM830076
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– 24 –
2. PROCESSES AND FUNCTIONS
2-1 Room Temperature Control .......................................................................... 26
(A)Cooling .....................................................................................................26
(B)Heating .....................................................................................................27
2-2 Cold Draft Prevention (Heating Cycle) .......................................................... 28
2-3 Automatic Fan Speed (Indoor Unit)............................................................... 29
(A)Cooling .....................................................................................................29
(B)Heating .....................................................................................................29
2-4 Outdoor Fan Speed Control .......................................................................... 30
(A)Cooling .....................................................................................................30
(B)Heating .....................................................................................................30
2-5 Freeze Prevention (Cooling) ......................................................................... 31
2-6 Condensing Temperature Control (Cooling) ................................................. 32
2-7 Overload Protection (Heating)....................................................................... 33
2-8 Discharge Temperature Control (Cooling and Heating) ................................ 34
2-9 Auto. Mode for Automatic Heating/Cooling Switching................................... 35
2-10 Defrosting Control, Outdoor Heat Exchanger Coil (Heating)......................... 37
2-11 4-Way Valve, Solenoid Control ..................................................................... 38
(A)Normal Control Mode ...............................................................................38
(B)AUTO Control Mode .................................................................................39
2-12 Automatic Restart after Power Interruption ................................................... 39
2-13 Electronic Expansion Valve .......................................................................... 40
2-14 Compressor Discharge Gas Temperature .................................................... 40
(A)Cooling .....................................................................................................40
(B)Heating (Except During Defrosting) ......................................................... 40
2-15 Compressor Current Detection Circuit .......................................................... 41
2-16 Electronic Expansion Valve Control .............................................................. 42
2-17 Voltage Detection Control ............................................................................. 43
2
SM830076
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– 25 –
2. Processes and functions
2-1 Room Temperature Control
The Unit adjusts room temperature by turning the outdoor unit’s compressor ON and OFF.
This process is controlled by the thermostat located in the remote control unit.
The figures on this and the next pages show how each part of the system performs when the
room temperature changes and the thermostat activates the compressor to start (thermo ON)
or stop (thermo OFF). Fig. 1 shows about the cooling cycle, and Fig. 2 shows about the
heating cycle.
(A) Cooling
(THERMO. OFF)
THERMO. OFF
(THERMO. ON)
ROOM TEMP.
THERMO. ON
BODY SENSOR
T+2 °F
SET TEMP. T °F
T–2 °F
MORE THAN
5 MINUTES
MORE THAN
3 MINUTES
MORE THAN
5 MINUTES
3 MINUTES
OFF
5 MINUTES
ON
2
COMPRESSOR
1
OUTDOOR FAN
(H OR M)
ON
ON
OFF
OFF
ON
ON
OFF
ON
SET SPEED
1. Refer to 2-4 Outdoor Fan Speed Control
INDOOR FAN
1133_THS_I
Fig. 1
Chart Summary and Explanations
❑
❑
❑
Once the compressor starts, it keeps running for 5 minutes.
Once the compressor stops, it will not start running again for 3 minutes.
If you change the operation mode (HEAT, COOL, or FAN) during the cooling cycle, the
control circuit stops the compressor for 3 minutes.
❑
❑
For 5 minutes after the compressor is first turned on, and for 3 minutes after it is turned off,
the compressor is not controlled by the room sensor.
Thermo ON: When room temperature rises 2°F (4°F when set on body sensor) above
the set temperature T˚, (T˚+2°F or T˚+4°F when set on body sensor):
Compressor ➞ ON
Thermo OFF: When the room temperature is –2°F below the set temperature T˚:
Compressor ➞ OFF
❑
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– 26 –
2. Processes andfunctions
(B) Heating
THERMO. ON
THERMO. ON
REMOTE CONTROL
SENSOR
THERMO. OFF
THERMO. OFF
THERMO. ON
(Only for wireless
remote controller)
SET. +2°F
SETTING TEMP.
SET. –2°F
THERMO. OFF
THERMO. OFF
THERMO. ON
BODY SENSOR
THERMO. ON
THERMO. ON
+2°F
SET TEMP.+7°F SHIFT
–2°F
SET TEMP.
MORE THAN
3 MINUTES
MORE THAN
5 MINUTES
5 MINUTES
ON
3 MINUTES
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
COMPRESSOR
1
OUTDOOR FAN
(H OR M)
ON
OFF
ON
ON
2
3 SECONDS
2
SET SPEED
SET SPEED
OFF
SET SPEED
OFF
LL
LL
L
L
LL
INDOOR FAN
2
OFF ON
ON
ON
OFF
STANDBY
(88°F)
INDOOR HEAT
EXCH.
COIL
81°F
TEMP.
77°F
E2
SOLENOID
COIL (4-WAY)
TEMP.
ON (REVERSING CYCLE)
ON
OPERATION
BUTTON
OFF
1. Refer to 2-4 Outdoor Fan Speed Control
2. Refer to 2-2 Cold Draft Prevention (Heating)
1134_THS_I
Fig. 2
Chart Summary and Explanations
❑
❑
❑
Once the compressor starts, it keeps running for 5 minutes.
Once the compressor stops, it will not start running again for 3 minutes.
If you change the operation mode (HEAT, COOL or FAN) during the heating cycle, the
control circuit stops the compressor for 3 minutes.
❑
For 5 minutes after the compressor is first turned on, and for 3 minutes after it is turned off,
the compressor is not controlled by the room sensor.
When set on remote control sensor
Thermo ON: When room temperature is –2°F below the set temperature T˚.
Compressor ➞ ON
Thermo OFF: When the room temperature is 2°F above the set temperature T˚, (T˚+2°F)
Compressor ➞ OFF
When set on body sensor
NOTE: In case of Body sensor, operating temperature is shifted to setting temperature +7°F.
SM830076
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– 27 –
2. Processes and functions
2-2 Cold Draft Prevention (Heating Cycle)
The cold draft prevention function controls indoor fan speed so a strong draft of cold air will
not blow out before the indoor heat exchange coils have warmed up.
❑ STANDBY shows on the remote controller when the indoor fan speed is LL (very
low) or OFF. This condition occurs in the following 3 cases:
• During Thermo OFF (refer to 2-1 B). Room Temperature Control, Heating)
• During the defrosting operation (refer to 2-10 Defrosting Control, Heating)
• Until either the coil temperature E2 reaches 81°F or when a maximum of 6 minutes
has past.
❑ The indoor fan motor operates in L instead of LL for 3 seconds as it starts to give
the fan an initial boost.
92
2
MAX. 6 MINUTES
88
INDOOR UNIT
COIL TEMP.
E2 (°F)
81
77
50
AUTO OR H LL
LL/OFF
LL/OFF
LL/OFF
LL
LL
LL
L
L
L
M
M
L
H
M
L
SET
FAN
M
L
LL
LL
SPEED
“STANDBY”
INDICATOR
“STANDBY” APPEARS
LL= Very low speed
L= Low speed
M= Medium speed
H= High speed
1135_THS_I
Fig. 3
Chart Summary and Explanations
❑
❑
❑
The main idea of this chart is to show that the indoor fan speed increases and gets closer to
the set fan speed as the coil temperature E2 rises.
The indoor unit’s coil temperature is taken from sensor E2 located in the middle of the indoor
heat exchange coil.
The dotted line shows that the indoor fan motor is OFF. When the temperature at sensor E2
falls below 50°F, the indoor fan motor stops running.
SM830076
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– 28 –
2. Processes andfunctions
2-3 Automatic Fan Speed (Indoor Unit)
By pressing the FAN SPEED button on the remote controller, the fan speed can be set at
one of four steps: AUTO., HI., MED., or LO. When set at AUTO. the indoor unit fan speed
will be automatically adjusted to the room temperature as the two charts shown below.
(A) Cooling
ROOM TEMP.
(deg)
+3
+2
+1
SET TEMP.
INDOOR FAN
H
H
SPEED
M
M
L
2
H : High
M: Middle LL: Very low
L : Low
0433_M_S
Fig. 4
Chart Explanations and notes
❑
When the fan speed changes, it keeps the speed step for at least 3 minutes, even if the
temperature changes to another speed step during the time.
(B) Heating
ROOM TEMP.
(deg)
SET TEMP.
–2
–4
INDOOR FAN
H
SPEED
H
M
M
L
H : High
L : Low
M : Middle LL: Very low
0434_M_S
Fig. 5
Chart Explanations and notes
❑
When the fan speed changes, it keeps the speed step for at least 1 minute, even if the
temperature changes to another speed step during the time.
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– 29 –
2. Processes and functions
2-4 Outdoor Fan Speed Control
To optimize the performance of air conditioner, the outdoor fan speed is selected
automatically according to the outdoor temperature.
❑ Note that in both Cooling and Heating modes, the fan comes on at first at high
speed (H mode) for 5 seconds. Since outdoor conditions sometimes make it
difficult for the fan to start, this sudden surge of power may be necessary.
❑ The outdoor fan operates in H mode for 3 minutes after the compressor stops
(excluding defrosting operation period).
❑ Charts below show how the outdoor fan speed changes with the change in
outdoor temperature.
(A) Cooling
Outdoor unit coil
temperature [C2]
Outdoor fan
motor (FMo)
2
H
or more 77°F
less than 77°F
H
77
M
M
Fig. 6
(B) Heating
Outdoor coil
temperature [C2]
Outdoor fan
motor (FMo)
M
or more 57°F
less than 57°F
M
H
57
H
Fig. 7
SM830076
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– 30 –
2. Processes andfunctions
2-5 Freeze Prevention (Cooling)
Freeze Prevention keeps the indoor heat exchange coil from freezing. Freezing reduces the
efficiency of the unit, and frost buildup on the coil blocks cool air circulation from the indoor
unit's fan.
MIN. VALUE OF
EITHER E1 OR E2
INDOOR UNIT
TEMP.
34
32
31
30
CONTINUOUS
DETECTION
FOR 2 MINUTES
(°F)
ELECTRONIC REF.
CONTROL
VALVE SIGNAL
2
OPEN
OPEN
COMPRESSOR
MINIMUM 3
MINUTES
ON
ON
1138_THS_I
Fig. 8
Note: Freeze prevention is controlled by the temperature at the indoor heat
exchanger coil as sensed by either sensor E1 (located at the entrance
of the coil) or sensor E2 (located on the middle of the coil). Freeze
prevention cycle is controlled by the lower temperature sensed at either
of the two sensors.
Chart Explanations and notes
❑
❑
This chart shows when the electronic refrigerant control valve opens to regulate the
temperature of the indoor unit coil to prevent freezing.
If the refrigerant control is not effective and the temperature continues to drop and stays
below 30°F for 2 minutes continuously, the control circuit stops the compressor. The
compressor does not start again until the temperature rises above 34°F.
The compressor stops for 3 minutes minimum.
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– 31 –
2. Processes and functions
2-6 Condensing Temperature Control (Cooling)
Condensing temperature is controlled by the outdoor heat exchanger coil temperature as
sensed by sensor C2.
140
OUTDOOR UNIT
COIL TEMP. C2
(°F)
131
OUTDOOR FAN
FORCED
SPEED
H, M
H, M
H
ELECTRONIC REF.
CONTROL VALVE
OPEN
1139_THS_I
2
Fig. 9
Chart Explanations and notes
❑
This chart shows how the outdoor fan speed and the electronic refrigerant control valve
react to coil temperature to control condensing temperature.
❑
❑
Sensor C2 is located in the middle of the outdoor unit heat exchange coil.
When C2 rises above 140°F the electronic refrigerant control valve opens at 50 steps/30
seconds, and the outdoor fan speed is forced to change to high (H) until C2 falls below
131°F.
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– 32 –
2. Processes andfunctions
2-7 Overload Protection (Heating)
This function prevents the air conditioner from overloading.
(°F)
147
144
140
INDOOR UNIT COIL
TEMP. (E2)
138
131
127
OVERLOAD
PROTECTION
OVERLOAD PROTECTION
FUZZY CONTROL
FUZZY CONTROL
2
ELECTRONIC REF.
CONTROL VALVE
OPEN
OPEN
START UP
OUTDOOR FM
COMPENSATION
OFF
H OR M
H
M
H OR M
1140_THS_I
Fig. 10
Chart Explanations and notes
❑
❑
This chart shows how the outdoor fan speed and the electronic refrigerant control valve
react to coil temperature to keep the indoor heat exchanger coil from overloading.
When sensor E2 rises above 140°F the electronic refrigerant control valve opens at 50
steps/30 seconds until E2 falls below 138°F.
❑
❑
Sensor E2 is located in the middle of the indoor unit heat exchange unit.
When sensor E2 rises above 144°F, the control circuit stops the outdoor fan motor till the
temp. drops to 131°F
❑
Fuzzy control controls the electronic refrigerant control valve.
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2. Processes and functions
2-8 Discharge Temperature Control (Cooling and Heating)
This function prevents the compressor motor from burnout by overheating.
239
221
203
200
DISCHARGE GAS
TEMP. (°F)
194
185
OUTDOOR
FAN SPEED
H OR M
H OR M
M
2
COMPRESSOR
ON
ELECTRONIC REF.
CONTROL VALVE
(DISCHARGE TEMP.)
OPEN
OPEN
TRIP IS OPERATED.
1141_THS_I
Fig. 11
Chart Summary and Explanations
❑
❑
Discharge temperature is sensed by TH8 (discharge gas sensor).
When the temperature rises above 203°F the electronic refrigerant control valve opens at
50 steps/30 seconds until the temperature falls below 200°F.
❑
During HEATING operation, when the temperature rises above 221°F, the control circuit
stops the outdoor fan motor until the temperature falls below 194°F. Please note that this
control does not function during COOLING operation.
❑
❑
For both COOLING and HEATING modes, if the temperature reaches 239°F the operation
shuts down and alarm P3 appears on the remote controller.
The outdoor fan speed is controlled on discharge temp. at heating mode.
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2. Processes andfunctions
2-9 Auto. Mode for Automatic Heating/Cooling Switching
❑ When the AUTO mode is selected, the microprocessor calculates the difference
between the set temperature and the room temperature, and automatically switches
to the COOLING or HEATING mode to maintain the desired temperature.
Room temp. ] Set temp. ➔ COOLING
Room temp. < Set temp. ➔ HEATING
This means that if the room temperature is higher or equal to the set temperature,
COOLING operation starts. If the room temperature is lower than the set
temperature, HEATING operation starts.
A
COOLING SELECTION TEMP.
+5 deg
SHIFT SET TEMP.
+4 deg
2
REMOTE CONTROLLED
B
SET TEMP.
SHIFT SET TEMP.
–4 deg
HEATING SELECTION TEMP.
–6 deg
C
HEATING
COOLING
HEATING
1142_THS_I
Fig. 12
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2. Processes and functions
Chart summary and Explanations
❑
❑
❑
This chart shows how the Operation Mode (COOLING or HEATING) is determined by the
microprocessor taking the room temperature into consideration. It also shows the
temperature points at which the cooling or heating mode is switched, when the AUTO mode
is selected.
After operation starts, the set temperature shifts automatically by +4 deg. at cooling and
by -4 deg. at heating. For example, if cooling is selected, the set temperature changes from
68°F to 72°F.
(The display of the remote controller remains 68°F.)
The change of the operation mode (heating to cooling, cooling to heating) by the change of
the room temperature during the operation is as follows.
Heating to Cooling; Room temp. ≥ Shifted temp +1.0 deg.
Cooling to Heating; Room temp. ≤ Shifted temp -2.0deg.
For example, if the room temperature rises above 73°F (=72+1) during the cooling
operation at the room temperature 68°F set by the remote controller, the operation changes
to cooling. When the room temperature lowers below 63°F (=65-2) thereafter, the operation
changes to heating again.
❑
In heating operation, using the body sensor, room temperature control is designed so that
room air temp. is sensed as 8 deg. lower than suctioned air at indoor unit taking into
account of the temperature gap between upper part and lower part of the room.
2
❑
❑
Within 10 minutes after the compressor turns OFF, the operation does not change to
cooling (heating), even when the room temperature changes from C to A (A to C).
When switching from cooling (heating) to heating (cooling), the actuation of the 4 way valve
will delay about 30-50 seconds after the compressor turns ON.
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2. Processes andfunctions
2-10 Defrosting Control, Outdoor Heat Exchanger Coil (Heating)
When the outdoor temperature is low, frost may form on the outdoor heat exchanger coil.
When this occurred, the defrosting system operates. The microprocessor in the outdoor unit
monitors the relationship between the temperature of the outdoor heat exchanger coil and the
outdoor temperature so it can defrost when necessary.
Flow of Defrosting
OUTDOOR COIL
TEMP. C1 (°F)
Y
“RELEASE OF
DEFROSTING”
RANGE
Heating operation
50
OUTDOOR AIR TEMP.
(°F)
No counting time for detecting
frost : 15 minutes
7.3
50
X
27
18
The area below the heavy line
is the frost detection area.
Detecting the frost
–4
2
Stand by time for defros:
25 minutes
Either continuous 8 minutes or cumulative 60 minutes
are required to detect frost in the “Frosting” range.
Defrosting
Refer to time chart.
*Minimum continuous operating time by defrosting is 48 minutes (= 15 + 8 + 25).
Occurs either when the temperature of C1 (the outdoor
heat exchanger coil) has reached 50°F or above,
or when the maximum defrosting time (9 minutes)
has elapsed.
Release of defrosting
1143_THS_I
Fig. 13
Time Chart for Defrosting
1 MINUTE
ON
MAX. 9 MINUTES
ON
1 MINUTE
ON
COMPRESSOR
SOLENOID COIL
(4 WAY VALVE)
ON
ON
ON
ON
OUTDOOR FAN
(H OR L)
INDOOR FAN
(SET SPEED)
OFF
OR LL
OFF OR LL
“STANDBY”
INDICATOR
“STANDBY” APPEARS
Defrosting
Start
Release of
Defrosting
0442_M_S
Fig. 14
❑
❑
During the defrost cycle, STANDBY appears on the remote controller.
*......Cold Draft Prevention may operate occasionally
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2. Processes and functions
2-11 4-Way Valve, Solenoid Control
The basic function of the 4-way valve is to direct the refrigerant in the correct direction
according to the Operation Mode (COOLING or HEATING) selected.
The following two charts show conditions of the controls and functions listed in the left hand
column when the solenoid is ON or OFF. Chart (A) on this page shows the relationships when
the temperature control is in NORMAL mode, and Chart (B) on the next page shows the
relationships when the remote controller is set to AUTO mode.
(A) Normal Control Mode
OFF
ON
POWER SOURCE
OPERATION
BUTTON
ON
OFF
ON
2
COOL
COOL
MODE
BUTTON
HEAT
HEAT
HEAT
2
3 MINUTES
ON
TURN ON
THERMO OFF
THERMO OFF
THERMO
ON
TURN OFF
THERMO
ON
OFF
ON
1
OFF
2
ON
OFF
2
ON
COMPRESSOR
1
1
1
SOLENOID COIL
(4-WAY VALVE)
OFF
ON
OFF
ON
1. . . More than 5 minutes
2. . . More than 3 minutes
0443_M_S
Fig. 15
Chart Summary and Explanations
❑
❑
❑
For the first 3 minutes after power is applied, the 4–way valve remains OFF and the
compressor will not operate, even if the ON button is pushed.
If the 4–way valve is turned OFF with the compressor operating, the air conditioner
operates in COOLING mode. See Table below.
If the 4–way valve is turned ON with the compressor operating, the air conditioner operates
in HEATING mode. See Table below.
4-way valve
solenoid
Operation Mode
Compressor
ON
COOLING
HEATING
OFF
ON
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2. Processes andfunctions
(B) AUTO Control Mode
POWER SOURCE OFF
ON
OPERATION
BUTTON
ON
MORE THAN 10 MINUTES MORE THAN 10 MINUTES
(THERMO. OFF) (THERMO. OFF)
AUTO
COOL
COOL
MODE
CONTROL HEAT
HEAT
HEAT
THERMO. OFF
THERMO. ON
3 MINUTES
MORE THAN
3 MINUTES
OFF
COMPRESSOR
OFF
OFF
ON
OFF
MORE THAN
ON
OFF
ON
ON
MORE THAN
30 – 50 SECONDS
30 – 50 SECONDS
SOLENOID COIL
(4-WAY VALVE)
2
ON
OFF
ON
0445_M_S
Fig. 16
When the Compressor has stopped while in AUTO mode, the 4-way valve switches on
(heating) or off (cooling) within 1 minute according to the following conditions:
Compressor has stopped
under the operation of
“AUTO mode” condition.
4-way valve delays its
switching for 30 – 50 seconds
after compressor has been
turned ON.
0446_M_S
Fig. 17
2-12 Automatic Restart after Power Interruption
This air conditionner has a power failure recovery function.
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2. Processes and functions
2-13 Electronic Expansion Valve
❑ This valve allows very precise and smooth control of the amount of refrigerant flow in the
system. Since the valve is operated by a step motor, the control circuits can open or
close it in very exact amounts, so the degree of heating or cooling can be changed by
just a little, or changed very quickly or slowly.
(Completely close …… 0 step)
(Full open ................480 step)
Min. open
Max. open
Model
Heating
100 step
90 step
Cooling
120 step
90 step
24 type
36 type
480 step
480 step
❑ Fuzzy Control
Fuzzy Control is a controlling system to control electronic refrigerant control valve using
fuzzy logic. It regulates the functions of heating and cooling, as well as some of the
processes inside the unit, by taking account of many different conditions of temperature,
fan speed, etc. These control circuits work automatically to send just the right amount of
refrigerant through the Electronic Refrigerant Control Valve.
2
2-14 Compressor Discharge Gas Temperature
(A) Cooling
Indoor temp. (°F)
68 – 77
79 – 82
81 – 95
84 – 90
Outdoor temp. (°F)
55 or below
104 – 176
57 – 61
97 – 109
Compressor discharge
gas temp. (°F)
104 – 194
140 – 212
158 – 221
(B) Heating (Except During Defrosting)
Indoor temp. (°F)
64 – 70
72 – 77
79 – 86
Outdoor temp. (°F)
32 or below 34 – 50 32 or below 34 – 50 52 – 70 32 or below 34 – 50 52 – 70
Compressor discharge
gas temp. (°F)
104 – 176 122 – 194 122 – 194 122 – 212 140 – 221 122 – 194 140 – 212 158 – 221
❑
❑
Operate the unit at least 30 minutes to stabilize the discharge temperature.
The above discharge temperature was measured with a 15m tubing length.
The temperature may vary with tubing length.
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2. Processes andfunctions
2-15 Compressor Current Detection Circuit
❑ The Compressor Current Detection Circuit detects the compressor current and,
depending on the current range, can stop the compressor motor so it will not be
damaged by overcurrent.
❑ Overcurrent can be caused by several factors, particularly mechanical seizing of the
compressor or liquid backflow. Either of these conditions can hold the compressor
to run, and thus drawing so much current that the motor can burn out.
Comp. Amps.(A)
Locked Comp. Cut-off Range
Is
1.4
+
Overload Protection Range
Normal Operation Range
Is
1.17
+
Is
Rated Current
value
0447_M_S
Fig. 18
2
Rated Current Value
Overload Protection
Locked Compressor Cut-off
Is x 1.4 (A)
Outdoor Model
ls (A)
ls x 1.17 (A)
CH2432
CH3632
17.1
20.0
23.9
38.5
27.5
32.0
Chart Summary and Explanations
❑
Overload Protection
•
When the detected current is 1.17 – 1.4 times greater than the rated current value (Is) and continues
for 30 seconds, both compressor and outdoor fan stop (Thermostat OFF).
•
After 3-minute pause, if the air conditioner is ready for Thermostat ON, it starts again. However, if the
condition mentioned above repeats twice within 30 minutes, the remote controller displays the alarm
message H01, compressor overload.
❑
❑
Locked Compressor Cut-off
•
When the detected current is 1.4 times greater than the rated current value (ls) and continues for 2
seconds, both compressor and outdoor fan stop (Thermostat OFF).
•
After 3-minute pause, if the air conditioner is ready for Thermostat ON, it starts again. However, if the
condition mentioned above repeats twice, the remote controller displays the alarm message H02,
compressor locked.
Failure of Compressor Current Detection
•
When the Compressor Current Detection Circuit fails to detect the compressor current within 2
seconds after compressor starts, both compressor and outdoor fan stop (Thermostat OFF).
•
After 3-minute pause, if the air conditioner is ready for Thermostat ON, it starts again. However, when
the circuit fails to detect the current twice in a row, the remote controller displays alarm message H03,
Failure of compressor Current Detection.
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2. Processes and functions
2-16 Electronic Expansion Valve Control
The circulation volume of the refrigerant is controlled by a pulse type electronic control valve.
When the power is switched ON, the opening degree of the electronic control valve is
controlled between 90 and 480 steps after setting the initial step at the time when the
thermostat is ON.
Contents and Order of control
Cooling
Heating
Start
Start
Discharge gas temperature control
Outdoor unit coil temperature control
Freeze prevention control
Discharge gas temperature control
High load prevention control
Heating start up control
2
Refrigerant flow distribution control
Refrigerant flow distribution control
Discharge gas target temperature
control (Fuzzy control)
Discharge gas target temperature
control (Fuzzy control)
*
*
0451_M_S
Repeat control in accordance with the priority order.
*
Even though the operation is performed every 30 seconds, the control of discharge gas
temperature, high load prevention, outdoor unit coil temperature and freeze prevention
activates when it occurs.
(1) Refrigerant flow distribution control
At the control of flexible combination (a plural number of indoor units are set), the opening
degree of the electronic control valve is controlled by the indoor unit coil temperature.
Cooling: indoor unit coil E2 temperature (located at the middle of coil)
Heating: indoor unit coil E1 temperature (located at the outlet of coil)
(2) Fuzzy control (optimal refrigerant flow rate control)
By outputting the fuzzy estimation result corresponding to the fuzzy input variables (the indoor
unit coil temp., the deviation between the actual discharge gas temp. and the target discharge
gas temperature calculated from the outdoor unit coil temperature and the change thereof),
the electronic refrigerant valve is controlled so that the unit can perform its maximum ability in
accordance with the indoor and outdoor temperature conditions at the operation.
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2. Processes andfunctions
2-17 Voltage Detection Control
When the power voltage falls below 160 V or rises above 260 V, operation lamp and stand-by
lamp flash alternately to protect the compressor and electrical components.
2
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2. Processes and functions
2
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3. ELECTRICAL DATA
3-1 Indoor Unit (Electric Wiring Diagram, Schematic Diagram) ............................... 46
3-2 Outdoor Unit (Electric Wiring Diagram, Schematic Diagram)............................. 48
3
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3. Electrical data
3-1 Indoor Unit
1 XHS2432, XHS3632
O R G
B L K
B L K
G R N / Y E L
B L K
G R Y
G R N / Y E L
B L K
G R Y
B L K
B L K
B L K
B L K
B L K
W H T
R E D
Y E L
B R N
B R N
R E D
R E D
3
R E D
B R N
W H T
W H T
G R Y
G R Y
W H T
V L T
O R G
Y E L
B L K
B R N
P N K
V L T
O R G
Y E L
B L K
G R Y
B L K
Y E L
R E D
O R G
P N K
B R N
B R N
B L K
B L K
G R N / Y E L
B L U
P N K
B L K
B L K
W H T
R E D
G R N / Y E L
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3. Electrical data
3-1 Indoor Unit
1 XHS2432, XHS3632
• Schematic Diagram
CR-THS2432
Controller
CD
1
2
3
4
1
6
1
2
3
SG
SG WL
12V
G
F1(3A)
49FI
4P-1
4P-2
IND
CONT
RC 12V
G
1
1
R
TR1
1
1X
1
2
3
4
2
3
4
5
T6
SEC
PRY
MOV
RY1
RY2
2X
1
3
1
2
3
PNL
3X
3X
49FI
3
LM
DP
LL
L
5
H
H
HH COM
1
1
7
3
3
5
1
1
1
1
3
FS
FS
1X
2X
4
L
6
7
Room Thermistor
3
1
2
LL
HH
HT
8
TH1
3X
Indoor Coil E1
1
2
RY1
LM
DP
TH2
FMI
LM
2
DP
Indoor Coil E2
RY2
1
2
TH3
49FI
1
2
DC12V
RC1
9
1
2
SG1
SG2
SG1
3
3
3
3
N
COM
4P-
U2
4P-
U1
F2(3A)
To Outdoor Unit
Symbols
Description
Symbols
Description
FMI
Indoor Fan Motor
TH1
TH2
TH3
Room Thermistor
49FI
RC1
F1,2
DP
Indoor Motor Thermal Protector
Running Capacitor
Fuse
Thermistor (Indoor Coil E1)
Thermistor (Indoor Coil E2)
CR-THS2432 Indoor Controller
Drain Pump
CONT
IND
Controller
LM
Auto Louver Motor
Power Transformer
Auxiliary Relay
Indicator Lamp Assy
Terminal Plate
Connector
TR1
1X-3X
RY1-RY2
MOV
FS
Auxiliary Relay
Terminal
Motor Operated Valve
Float Switch
S 854-2-5268-772-00-0 (XHS)
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3. Electrical data
3-2 Outdoor Unit
1 CH2432
B R N
B R N
W H T
W H T
G R Y
R E D
R E D
B L K
B L K
B L K
B L K
3
B R N
Y E L
V L T
V L T
W H T
B L K
G R Y
B R N
W H T
G R Y
G R Y
B R N
B R N
P N K
P N K
R E D
R e l a y
B R N
Y E L
W H T
W H T
W H T
W H T
R E D
B L K
B L K
R E D
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3. Electrical data
3-2 Outdoor Unit
1 CH2432
• Schematic Diagram
Terminal
Plate (5P)
-1
CR-CH2432
Controller
(U1) (U2)
2P-1 2P-2
63PH
1
1
F1(3A)
RY1 RY2
-2
RY3
1
2
CN2
PRY
1Y
63PH
-G
RY4
1
3
3
7
AC 208V
230V
H
LL
20S 52C
3
5
3
3
49
FO
TR
-L1
-L2
2
1
SEC
AC 14V
2
3
4
RY1
RY2
RY3
RY4
20S
52C
TH6
TH7
TH8
1
2
Outdoor
Coil C1
49FO
52C
1
5
6
7
CT
H
M
L
20S
1
2
FM1
FM2
DC12V
Outdoor
Coil C2
CH
2
1Y
52C
FMO
52C
1
2
Discharge
Gas
1
2
1
1
9
PTC
RC1
1
3
49
C
RC2
CT1
N1
R
3
C
S
3
1
1
CM
F2(3A)
Symbols
Description
Symbols
Description
CM
Compressor Motor
Outdoor Fan Motor
TH6
TH7
Thermistor (Outdoor Coil C1)
Thermistor (Outdoor Coil C2)
Thermistor (Discharge Gas)
PTC Thermistor
FMO
52C
Compressor Motor Magnetic Contactor TH8
49FO
63PH
CT
Outdoor Fan Motor Thermal Protector
High Pressure Switch
Current Transmitter
Running Capacitor
Power Transformer
Crank Case Heater
Four Way Valve
PTC
CR-CH2432
RY1~RY4
1Y
Outdoor Controller
Auxiliary Relay
RC1, RC2
TR
Auxiliary Relay
Terminal Plate
CH
Terminal
20S
Connector
F1, F2
Fuse
S 854-2-5268-582-00-2 (CH2432)
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3. Electrical data
3-2 Outdoor Unit
2 CH3632
B R N
B R N
W H T
W H T
G R Y
R E D
W H T
R E D
R E D
B L K
B L K
B L K
B L K
Y E L
V L T
3
V L T
V L T
W H T
G R Y
W H T
G R Y
G R Y
B R N
W H T
B R N
B R N
P N K
B R N
P N K
Y E L
V L T
V L T
W H T
G R Y
G R Y
B R N
W H T
G R Y
G R Y
B R N
B R N
P N K
P N K
B R N
Y E L
W H T
W H T
W H T
W H T
R E D
B L K
B L K
R E D
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3. Electrical data
3-2 Outdoor Unit
2 CH3632
• Schematic Diagram
Terminal
CR-CH2432
Controller
(U1) (U2)
2P-1 2P-2
Plate (5P)
1
63PH
1
-1
1
F1(3A)
RY1 RY2
-2
RY3
1Y
1Y
1
2
CN2
PRY
63PH
-G
RY4
1
3
AC 208V
230V
H
3
LL
20S 52C
2
3
7
5
3
3
TR
-L1
-L2
49
FO
3
2
1
SEC
AC 14V
2
RY1
RY2
RY3
RY4
20S
52C
49FO1
49FO2
TH6
TH7
TH8
1
2
Outdoor
Coil C1
52C
1
5
H
6
M
7
5
H
6
M
7
4
3
CT
L
L
20S 52C
1
2
FM1
FM2
DC12V
Outdoor
Coil C2
CH
2
1Y
52C
FMO1 FMO2
1
2
Discharge
Gas
1
2
1
2
1
PTC
4
RC1
1
3
RC2
RC3
9
CT1
49
C
N1
R
3
C
S
3
1
1
1
CM
F2(3A)
Symbols
Description
Symbols
Description
CM
Compressor Motor
Outdoor Fan Motor
TH6
TH7
Thermistor (Outdoor Coil C1)
Thermistor (Outdoor Coil C2)
Thermistor (Discharge Gas)
PTC Thermistor
FMO1, 2
52C
Compressor Motor Magnetic Contactor TH8
49FO1, 2
63PH
CT
Outdoor Fan Motor Thermal Protector
High Pressure Switch
Current Transmitter
Running Capacitor
Power Transformer
Crank Case Heater
Four Way Valve
PTC
CR-CH2432
RY1~RY4
1Y
Outdoor Controller
Auxiliary Relay
RC1, 2, 3
TR
Auxiliary Relay
Terminal Plate
CH
Terminal
20S
Connector
F1, F2
Fuse
S 854-2-5268-621-00-0 (CH3632)
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3. Electrical data
3
SM830076
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4. SERVICE PROCEDURES
4-1 Troubleshooting .............................................................................................54
(1) Check before and after Troubleshooting ................................................ 55
(2) General Troubleshooting Flow Chart: Diagnosis and Remedy .............. 56
(3) Meanings of alarm messages ................................................................ 58
(4) LED Indication on the Outdoor Unit’s P.C.B. Ass’y ................................ 60
(5) Symptoms and parts to inspect .............................................................. 61
(6) Procedures When a Specific Component Does Not Work ..................... 71
(7) Service Functions of Optional Wired Remote Controller ........................ 73
4-2 Checking the Electrical Components ............................................................ 87
(1) Measurement of Insulation Resistance .................................................. 87
(2) Checking the Protective Devices............................................................ 88
(3) Checking the Electrical Parts ................................................................. 89
(4) Sensor and Solenoid Layout Diagram.................................................... 92
(5) Thermistor Characteristic Curve............................................................. 94
(6) P.C.B. Setting..........................................................................................95
(7) R.C Address Setting Method.................................................................. 96
(8) Automatic Address Setting Method ........................................................ 97
(9) Displaying Indoor / Outdoor Unit Combination Numbers ....................... 97
(10) Items to Check Prior to Test Run ........................................................... 98
(11) Test Run..................................................................................................99
(12) P.C.B. and Parts Location .................................................................... 102
(13) Checking procedure for each PC Board............................................... 104
(14) Check Pins ............................................................................................105
4
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4. Service procedures
4-1 Troubleshooting
This section explains:
❑ What the LED codes mean
❑ What the remote control unit display screen messages mean
❑ How to use the flow charts to find and solve problems
❑
How to use the self-diagnostic tests to find parts that aren’t working right
This unit is made to be trouble free, and not need much service. However, with time, moving
parts wear out, electronic components break down, and sometimes misuse damages the unit.
The purpose of this section is to help you when the unit is not working properly. Sometimes
your experience will tell you right away where to look for a problem, and when you find it you
will know how to fix it at once.
Often, however, all you have is a symptom like “poor cooling” or “outside fan doesn’t come
on.” Now you must find out the cause of the problem, and then how to fix it. This section
provides several ways to help you go from the symptom to the cause and then the solution.
The first chart, General Troubleshooting Flow Chart is divided into two sections: Poor
heating and Poor Cooling. Under each heading you will find the main things that can go
wrong and cause either of these problems. Sometimes you can start with this chart and find
the problem right away, but often you will come here for more suggestions after you have
looked at the error code on the remote control unit display. This chart gives you the "big
picture" of problems and solutions.
The other main tool we explain here is the use of the Alarm Messages. When a certain part
fails or a safety device has shut the unit down, any alpha-numeric codes appears on the
display to guide you to the problem.
By understanding the code you can often go right to the problem area and then, with this
manual and your knowledge of air conditioning, find the solution.
4
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4. Service procedures
(1) Check before and after Troubleshooting
Many problems may happen because of wiring or power supply problems, so you should
check these areas first. Problems here can cause false results in some of the other tests, and
so should be corrected first.
1. Check power supply wiring
❑ Check the power supply wires are correctly connected between terminal
No. 1 & 2 on the 5P terminal plates in the indoor unit and the outdoor unit.
2. Check inter-unit wiring
❑ Check that inter-unit control wiring (DC low voltage) is correctly connected between the
indoor unit and outdoor unit.
Power Supply: 60 Hz, single-phase, 230/208 V
Disconnect SW
(Field supply)
Inter unit
power line
230/208 V
1
2
1
2
B
4
Power supply
single phase
230/208 V
G
G
Ground
L1
L2
U1
U2
U1
U2
L1
L2
C
A
Inter unit
control line
DC 5 V
Indoor
Unit
G
Ground
Outdoor
Unit
1103_M_I
Fig. 19
3. Check power supply
❑ Check that voltage is within the specified range (±10% of the rating).
❑ Check that power is being supplied.
If the following troubleshooting must be done with power being supplied, be
careful not to touch any uninsulated live part that can cause ELECTRIC
SHOCK.
4. Check the lead wires and connectors in indoor and outdoor units.
❑ Check that the sheath of lead wires is not damaged.
❑ Check that the lead wires are firmly connected at the terminal plate.
❑ Check that the wiring is correct.
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4. Service procedures
(2) General Troubleshooting Flow Chart: Diagnosis and Remedy
When you have found a major problem, such as refrigerant not flowing in the system or
reduced air circulation, come to this section and find the box listing the problem. Connected
to the box are the main causes of the problem and their remedies. To find out which
malfunction is happening in your case, check the remote controller for an Alarm Message,
and follow the steps in section 3).
(A) Cooling
a. Cooling
Poor cooling
Is setting temp.
Change the setting temp.
suitable ?
Is cooling load
too heavy ?
Review cooling load
estimate.
4
Refrigerant flow
failure
4-way valve is
defective.
Replace the 4-way valve.
Charge refrigerant gas.
Refrigerant
shortage
Electronic refrigerant
Replace the valve.
control valve is defective.
Compressor is defective.
Replace the compressor.
Open the valves fully.
Service valves are not
fully open.
Not enough air
circulation
Air filter
Clean the filter.
is clogged.
Is fan speed
set to LOW ?
Set the fan speed to
either MEDIUM or HIGH.
Refrigerant tubes between
indoor and outdoor units
are not insulated.
Insulate wide and narrow
tubes separately.
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4. Service procedures
(B) Heating
b. Heating
Poor heating
Is setting temp.
suitable ?
Change the setting temp.
Is heating load
too large ?
Review heating load
estimate.
Refrigerant flow
failure
4-way valve is
defective.
Replace the valve.
Refrigerant
shortage
Charge with
refrigerant.
Electronic refrigerant
Replace the valve.
4
control valve is defective.
Compressor is defective.
Replace the compressor.
Service valves are not
fully open.
Open the valves fully.
Clean the filter.
Not enough
Air filter
air circulation
is clogged.
Is fan speed
set to LOW ?
Set the fan speed to
either MEDIUM or HIGH.
Refrigerant tubes between
indoor and outdoor units
are not insulated.
Insulate wide and narrow
tubes separately.
Cold air is
4-way valve is
defective.
Replace the valve.
discharged.
Cold draft prevention
is not working.
“ STANDBY ” is
displayed.
Replace indoor
P.C.B. Ass'y.
Indoor coil sensor E2 is
defective.
Replace the sensor.
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4. Service procedures
(3) Meanings of alarm messages
If an error occurred in the air conditioner, the error condition is presented by indicating the
error code in the wired remote controller display or by the combination of lamp statuses for
operation, timer and heat stand-by (OFF status and flashing status).
Wired remote Wireless remote
Possible causes of troubles
controller
display
controller
display
Remote controller is detecting
unusual signal from indoor unit.
Error receiving of serial communications signal.
Error transmitting of serial communications signal.
E01
E02
E03
Operation lamp
flashes
• Indoor unit is detecting unusual signal from the remote controller and group control.
(No serial communications signal)
O: Operation lamp
ⅷ: Timer lamp
Indoor unit address setting is duplicated.
Improper setting of indoor unit or
E08
E09
E10
E11
E14
ⅷ:Heat stand-by
lamp
remote controller.
Remote controller address (RCU.ADR) is duplicated.
Error transmitting of serial communications signal
Error receiving of serial communications signal.
Indoor unit is detecting unusual
signal from signal option.
Improper setting of indoor unit or
remote controller.
When using flexible combination control, main indoor unit address
setting is duplicated. (judged by outdoor unit.)
unusual
signal from outdoor unit.
Indoor unit is detecting
Error receiving of serial communications signal.
Error transmitting of serial communications signal
Error receiving of serial communications signal.
(Confirmation error of unit numbers included)
E04
E05
E06
Heat stand-by
lamp flashes
Outdoor unit is detecting
unusual signal from indoor unit.
ⅷ:Operation lamp
4
ⅷ: Timer lamp
Error transmitting of serial communications signal.
No. of judged indoor units or total capacity of indoor units is small.
No. of judged indoor units or total capacity of indoor units is large.
Error transmitting of serial communications signal
Error receiving of serial communications signal.
Indoor unit group address is not correct.
E07
E15
E16
E17
E18
L01
L02
L03
O: Heat stand-by
lamp
Auto. address setting is not
correct.
Indoor unit is detecting unusual
signal from another indoor unit.
Operation lamp and
heat stand-by lamp
flash at the same time.
Improper setting of indoor unit or
remote controller.
Model setting of indoor unit is not matching the outdoor unit.
When using group control, main indoor unit address setting is duplicated.
(judged by indoor unit.)
O: Operation lamp
ⅷ: Timer lamp
Outdoor unit address is duplicated.
L04
L07
O: Heat stand-by
lamp
Improper wiring between indoor units.
(There is a group connection wiring in case of individual control.)
Indoor unit address (or group address) is not set.
Capacity code of indoor unit is not set.
L08
L09
L11
L13
P09
P01
P10
P02
Improper wiring of group control wiring.
Indoor unit model setting is improper (capacity)
Improper wiring connections of ceiling panel.
ⅷ:Operation lamp
O: Timer lamp
Protective device in indoor unit
is activated.
Thermal protector in indoor fan motor is activated.
Float switch is activated.
O: Heat stand-by
lamp
Operation lamp and heat
stand-by lamp flash
alternately.
Protective device in outdoor unit
is activated.
• Thermal protector in outdoor fan motor is activated.
• Compressor thermal protector is activated.
• Power supply voltage is unusual. (The voltage is more than
260 V or less than 160 V.)
O: Operation lamp
ⅷ: Timer lamp
P03
P04
P05
P31
Discharge gas temperature of comp. is unusual.
High pressure switch is activated.
Voltage drops.
O: Heat stand-by
lamp
Other indooor unit is warning.
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4. Service procedures
Wired remote Wireless remote
Possible causes of troubles
controller
display
controller
display
Operation lamp and heat
stand-by lamp flash
alternately.
Indoor thermistor is either
open or short.
Indoor coil temp. (E1) cannot be detected.
Indoor coil temp. (E2) cannot be detected.
Indoor room temperature cannot be detected.
Discharge gas temp. cannot be detected.
F01
F02
F10
F04
F06
F07
O: Operation lamp
O: Timer lamp
ⅷ:Heat stand-by
lamp
Outdoor thermistor is either
open or short.
Outdoor coil liquid temp. (C1) cannot be detected.
Outdoor coil gas temp. (C2) cannot be detected.
• Non volatile memory IC (EEPROM) is abnormal (Indoor control panel)
F29
H01
ⅷ:Operation lamp
Protective device for
Compressor motor is overloaded.
compressor is activated.
H02
H03
H17
H18
O: Timer lamp
ⅷ:Heat stand-by
lamp
Compressor motor is locked.
Compressor current detection circuit is defective.
Power supply voltage between phases is unbalanced.
Standard comp. contactor (Mg SW)is chattering.
O: flashes
ⅷ: OFF
4
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4. Service procedures
(4) LED Indication on the Outdoor Unit’s P.C.B. Ass’y
If something goes wrong with the outdoor unit, LED lamps on the outdoor P.C.B. Ass’y light
up to show the cause of the trouble, in addition to the Alarm message on the remote
controller.
LED 2 on LED 1 on Remote
Possible cause of trouble
P.C. board P.C. board controller
Normal
ⅷ
ⅷ
ⅷ
⅜
No message
E06, E07, L04
Outdoor unit serial communication signal is abnormal.
Outdoor unit address is duplicated.
Other outdoor units are performing auto address and
detecting refrigerant shortage.
ⅷ
⅜
⅜
*
No message
P02
FMo • CM thermal protection is in operation.
Power supply voltage is abnormal.
High voltage SW activates
ⅷ
⅜
P04, P05
Negative phase protector activates.
Sensor is abnormal. (Open or short)
Abnormal compressor current value is detected.
Auto address failure
⅜
*
F04~F09
H01, H02
4
*
ⅷ
*
*
E15, E16
Flash at the same time
*
*
“SETTING”
flashes.
Auto address is in operation.
Flash alternately
NOTE ⅷ: LED lamps OFF ⅜: LED lamps ON (lights up) *: LED lamps ON (flashes)
LED 2 (D12)
LED 1 (D11)
1125_C_I
Fig. 20
CAUTION
* REFRIGERANT SHORTAGE
Note particularly that a shortage of refrigerant is only shown by the outdoor P.C.B. Ass’y
LEDs and the Alarm Message does not appear on the Indoor Remote Controller . The
compressor keeps running even when the refrigerant is less, so when you find the LED
indication on the outdoor P.C.B. Ass’y, stop the air conditioner immediately to avoid the
compressor damage.
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4. Service procedures
(5) Symptoms and parts to inspect
1) Symptom: LCD on the remote controller does not display and remote controller does not
operate.
Start
Is the LED (D80) on
Yes
the indoor unit PCB lit?
No
Is there 12 V DC
Is there 12 V DC
between 2 and 3
of the remote
controller?
Repair the
remote
controller
wiring.
No
Yes
between R2 and R3
on the 8P terminal
plate of the indoor unit?
No
Yes
4
No
Yes
Is there 230-208 V AC
between R and S of
the indoor PCB?
Miswiring of
power supply
wires and
indoor/outdoor
control lines
Is there 230-208 V AC
between U1 and U2
of the 8P terminal
plate?
Replace the
remote controller.
Yes
No
Check and repair the
power breaker etc.
Correct the
wiring. Remove the
socket connected to
the OC plug on the
PCB and connect to
the EMG plug instead.
No
No
Are the connections
for the 4P connector
for the indoor unit’s
PCB power trans-
former good?
Correct the
connections
Has the indoor
unit PCB fuse blown?
Yes
Yes
No
No
Replace the
Is the primary
side of the indoor
power transformer
shorted?
Is there 15 V AC
Replace the
indoor unit power
transformer.
Is the 230-208 V AC
circuit shorted?
No
between 1 and 2
of the 4P connector
for the indoor unit’s
power transformer?
indoor unit PCB.
Yes
Yes
Yes
Replace the
indoor unit PCB.
Replace the indoor unit’s
power transformer.
Replace or repair.
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4. Service procedures
2) Symptom: LCD on the remote controller displays “CHECK E01”.
(Unusual communication between remote controller and indoor unit.)
Start
Remote controller judges itself
with self-diagnostic functions
NG
Yes
Yes
Replace the remote controller.
OK
Is there an open or a contact
defect in the No. 1 line of the
remote controller?
Correct the wiring.
No
Is there 230 -208 V AC between
U1 and U2 of 8 P terminal plate?
Mis-wiring between the power
supply line and indoor/ outdoor
unit operation lines.
Correct the wiring, and pull out the
socket connected to the OC plug
to replace with the EMG plug.
Yes
No
4
Is the indoor unit PCB’s non-volatile
memory IC setting (“CHECK F29”
displayed) wrong?
Yes
Yes
Correct the setting.
No
Is the indoor unit PCB’s inspection
pin shorted?
Open the inspection pin.
No
Replace the indoor unit PCB
.
1145_THS_I
3) Symptom: LCD on the remote controller displays “CHECK E02”.
(Unusual communication between remote controller and indoor unit)
Start
Yes
Is the No. 1 line wire (red) for the
remote controller connected to
another line (2 or 3) or are No. 1
and No. 3 (black) wired reversed?
Repair the wiring.
No
NG
Remote controller judges itself with
self-diagnostic functions.
Replace the remote controller.
(To avoid misjudgment, always
remove the No. 1 line of the remote
controller wiring from the indoor
unit terminal plate.)
OK
Replace the indoor unit PCB.
0334_M_I
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4. Service procedures
4) Symptom: LCD on the remote controller is displaying “CHECK E04”.
(Unusual communication between the indoor and outdoor units.)
Start
No
No
Cut the breaker and remove the
indoor/outdoor unit control lines
connected to U1 and U2 of the
indoor unit 8P terminal plate.
After shorting the test pin (CN2)
on the indoor unit PCB, switch the
breaker on. Does the LED
Is the contact good at the 2P
connector for indoor serial
communications on the outdoor
unit PCB?
Correct the connections.
Yes
(red) on the PCB light up?
Replace the indoor unit PCB.
Yes
No
No
Is the contact good at the 2P
connector for indoor serial
communications on the outdoor
unit PCB?
Correct the connections.
Cut the breaker, remove the
indoor/outdoor unit control
lines connected to U1 and U2 of
the outdoor unit 8P terminal plate.
After shorting the test pin (CN11) on
the outdoor unit PCB, switch the
breaker on. Do the LEDs (red, × 2)
on the PCB flash?
4
Yes
Replace the indoor unit PCB.
Indoor/outdoor unit
control lines are cut off
Correct the wiring.
0335_M_I
5) Symptom: LCD on the remote controller is displaying “CHECK E05”.
(Unusual communication between the indoor and outdoor units)
Start
Indoor unit PCB transmission/
reception circuit defect
Replace the indoor unit PCB.
0336_M_I
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4. Service procedures
6) Symptom: LCD on the remote controller is displaying “CHECK E06”.
(Unusual communication between the indoor and outdoor units)
Start
Yes
Correct the setting.
Correct wiring.
Is the setting for the indoor address
on the indoor unit PCB inappropriate?
No
Yes
Is there a cut line or contact
defect between an indoor and
outdoor unit’s control line?
No
0337_M_I
Influenced by external noise
* See the section of INSTALLATION INSTRUCTION concerning with flexible combination
system.
7) Symptom: LCD on the remote controller is displaying “CHECK E08”.
(Duplicate indoor unit address setting)
4
Start
Yes
Is the setting for the non-volatile
memory IC on the indoor unit PCB
inappropriate? If the setting is
appropriate, “F29” is displayed.
(Are there two units with the same
address?)
Correct the setting.
No
Influenced by external noise
0338_M_I
* See the section of INSTALLATION INSTRUCTION concerning with flexible combination
system.
8) Symptom: LCD on the remote controller is displaying “CHECK E09”.
(Duplicate setting of RCU address switch of remote controllers)
Start
*
Yes
Are there two remote controllers
(master-slave) installed with both
remote controllers set as masters?
Correct the setting.
No
Replace the remote controller.
0339_M_I
* See the section of INSTALLATION INSTRUCTION concerning with controlling remote
controller switches when there are two remote controllers.
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4. Service procedures
9) Symptom: LCD on the remote controller displays “CHECK P01”.
(Indoor fan protection thermostat operation warning)
Start
Is there 230-208 V AC between S4
and T20-3 on the indoor unit PCB?
No
Yes
Yes
No
Correct the connection
Is there 230-208 V AC between
T20-3 and S4 after T20-1 and T20-3
on the indoor unit PCB shorted?
Is the indoor fan wire winding
protection thermostat (49FI) off?
Yes
No
Replace the indoor fan.
Replace the indoor unit PCB.
1146_THS_I
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4. Service procedures
10) Symptom: LCD on the remote controller displays “CHECK P02”.
(Compressor / outdoor fan protection thermostat operation warning / power
supply voltage abnormality)
Start
No
Is the power supply to the outdoor
unit normal?
Check the power breaker etc.
and repair.
(Voltage / defective phase?)
Yes
Yes
Yes
Yes
Is the fuse on the outdoor unit
PCB blown (F1 and F2)?
Replace the fuse.
No
Is the high voltage switch
(63 PH) off?
Replace the outdoor unit PCB.
Replace the outdoor unit PCB.
4
No
Is there 230-208 V AC between
CN19-9 and CN19-1 on the
outdoor unit PCB?
No
No
Is the outdoor fan wire winding
protection thermostat (49FO) off?
Yes
Replace the outdoor fan.
No
Is the compressor protection
thermostat (49C) off except 48 type?
Yes
• No refrigerant
• High load
• 4-way valve defect
• Clogged refrigerant circuit
• Electronic refrigerant control valve
defect (indoor unit)
Yes
Is there connector contact defect?
Correct the connection
No
Replace the outdoor unit PCB.
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4. Service procedures
11) Symptoms: LCD on the remote controller displays “CHECK P03”.
(Alarm for unusual discharge temp. of compressor)
Start
Unusual discharge gas temperature
• Refrigerant shortage
• Clogged refrigerant circuit
• Electronic refrigerant control
valve defect (indoor unit)
0343_M_I
12) Symptom: LCD on the remote controller displays “CHECK P04”.
(High-pressure switch activation warning)
4
Start
No
Yes
The system does not operate again.
Yes
Are there connection defects in
the wiring?
Repair the wiring.
No
High-pressure switch defect
High-pressure switch activation
(Both cooling and heating)
• Electronic refrigerant control valve
defect
Refrigerant over-charged
(Cooling)
• Outdoor unit, heat exchanger dirty,
clogged
• Outdoor unit air short
• Outdoor fan stopped
(Heating)
•
• Outdoor unit air short
• Indoor unit, heat exchanger dirty,
clogged
• Large pipe side service valve
closed
• Indoor fan stop
• Air filter clogged
0344_M_I
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4. Service procedures
13) Symptom: LCD on the remote controller displays “CHECK P05”.
(Negative phase detection operation warning)
Start
No
Is the power supply to the outdoor
unit normal?
Check the power breaker etc.
and repair
(Voltage defective phase?)
Yes
Yes
Does the outdoor unit operate when
two of the three phases are changed?
(Actuation of negative phase protector)
No problem
No
Yes
Yes
Is the fuse (F1, F2) on the indoor
unit PCB blown?
Replace the fuse.
No
4
Is there a contact defect in the
3P connector?
Correct the connection
No
Replace the outdoor PCB
0345_M_I
14) Symptom: LCD on the remote controller displays “CHECK E15”.
Start
Yes
Yes
When the group of the units are
installed, is there any mis-cross
between interunit control wiring and
refrigerant tubing?
Repair the wiring.
No
Are the total capacities of indoor units
to that of outdoor units less than 93%?
Select an indoor unit which matches
with the outdoor capacity.
No
Yes
Are there no contact failure between
outdoor and indoor units?
Check the contact.
No
Perform the same as “CHECK E04”.
0646_M_S
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4. Service procedures
15) Symptom: LCD on the remote controller displays “CHECK E16”.
Start
Yes
Yes
When the group of the units are
installed, is there any mis-cross
between inter unit control wiring and
refrigerant tubing?
Repair the wiring.
No
Are the total capacities of indoor units
to that of outdoor units more than 107%?
Select indoor units which match with
the outdoor capacity.
No
Confirm less than 5 indoor units are
connected.
0647_M_S
4
16) Symptom: LCD on the remote controller displays “CHECK L13”.
Start
Yes
When the group of the units are
installed, is there any mis-cross
between inter unit control wiring and
refrigerant tubing?
Repair the wiring.
No
Check the capacity of the indoor unit
by remote controller.
0648_M_S
See Test Run Manual.
17) “Check P9” is displayed on the remote control unit.
Start
Yes
Is 15P connector socket (RED)
being attached to panel
Connect firmly.
connected firmly with 15P plug?
Yes
Replace P.C.B. Ass’y in the
indoor unit.
0649_M_S
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4. Service procedures
18) Symptom: LCD on the remote controller displays “CHECK H01, H02, H03”.
(compressor current detection)
* Please check the related part described in the following chart after confirming the code
setting (S4) of the outdoor unit’s capacity on the PCB in the outdoor unit.
Start
“CHECK H01” display
Compressor overload
“CHECK H03” display
“CHECK H02” display
Compressor current detection
circuit defect
Compressor lock detection
detection
• Insufficient voltage
• Comp. motor magnetic contactor
defect
• L3 phase wire disconnected
• Comp. motor magnetic contactor
defect
Compressor lock
• Refrigerant over-charged
• Outdoor unit PCB defect
4
0346_M_I
19) Check the indoor unit (When the alarm of communication failure is not activated)
¶ If the electronic control valve failure occurred in Flexible Combination system
(simultaneous operation system), one indoor unit would not be operated normally, then
the other units won’t be operated either. Due to this, try to detect the troubled unit and
correct it.
Operate the unit in
cooling mode.
(30 minutes after its operation)
• Cooled air comes out.
Yes
• Is the temperature of each indoor coil sensor almost
Normal
the same? (Refer to the sensor temperature
display function of the remote controller.)
No
• Does each indoor coil sensor detect the temperature
correctly? (Is there any leakage from the pipe of the
temperature detection section?)
Yes
Failure in the electronic
control valve activation.
No
Replace the sensor.
0460_M_I
SM830076
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4. Service procedures
(6) Procedures When a Specific Component Does Not Work
1) Indoor fan does not operate.
No
Is fan motor capacitor
normal ?
Replace the capacitor.
Yes
Is there voltage output
of P.C.B. Ass'y for fan
motor ?
No
Replace the P.C.B. Ass'y
in the indoor unit.
Yes
• Check resistance of
fan motor winding.
Out
Replace the fan motor.
4
0650_M_S
2) Flaps in indoor unit’s air outlet does not operate, when you press SWEEP button.
No
Check the louver motor resistance.
Replace the motor.
Is auto louver motor normal?
Yes
Is 2P connector socket (WHT)
attached to panel
connected firmly with 2P plug ?
No
Connect firmly.
Yes
Replace P.C.B. Ass'y in the
indoor unit.
1200_M_S
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4. Service procedures
3) Compressor motor does not operate.
No
Does compressor motor magnetic
contactor (52C) actuate ?
Replace the compressor
motor magnetic contactor.
Yes
Check resistance of compressor
motor winding.
NG
Replace the compressor.
0461_M_I
4) Outdoor fan does not operate.
4
Are auxiliary relays (1Y)
No
Replace the relays.
normal ?
Yes
No
Replace the capacitor.
Is fan motor capacitor normal ?
Yes
No
Is there voltage output of
Replace P.C.B. Ass’y
in the outdoor unit.
P.C.B. Ass’y for fan motor ?
Yes
Check resistance of fan motor
winding.
NG
Replace the fan motor.
1148_THS_I
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4. Service procedures
(7) Service Functions of Optional Wired Remote Controller
(Temperature displayed on the screen is not °F but °C.)
From the remote controller you can control both the operation and settings of the unit as well
as perform several useful service checks. This section explains how to use the remote
controller on the following items from (A) to (J).
(A) Set service check switches.
(B) Use the test run procedure.
(C) Check the sensor temperature readings.
(D) Find out about past service problems.
(E) Check the remote controller itself for correct operation.
(F) Excute the auto. address operation.
(G) Confirm and change the indoor unit address.
(H) Change the shift temperature in heating mode
( I ) Set the indoor unit address.
(J) Change the period of the filter timer
4
(A) Set service check switches
The service check switch (RCU.CK) is located on the back of the remote controller’s P.C.B.
Ass’y as follows :
0354_M_I
The followings are the correct switch settings for ordinary use of the unit. Only change the
settings temporarily for making service checks. When you finish the settings, be sure to
return them to the standard settings shown here.
❏ RCU.CK switch - Refer to section (E) “ Checking the remote controller for correct
operation”
(Remote Control Unit, Check)
❏ RCU.ADR switch - Keep the switch OFF all the time except in case of sub remote
controller
(Remote Control Unit, Address)
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4. Service procedures
(B) Use the test run procedure
❏ The purpose of the test run function is to let you control the operation of the unit
directly without turning the unit on or off by thermostat. As indicated in the following
procedure, be sure to stop test run operation when you finish the procedure, or the air
conditioner may be damaged.
❏ To protect the air conditioner from overloading, the outdoor unit will not start running
for 3 minutes after power is applied or the unit is turned OFF.
a Press the TEST / CHK button at
the bottom right on the remote
controller.
AIR FLOW
UNIT
MODE
b Press the ON / OFF operation
button to start the test run.
FLAP
°C
SET TEMP.
FAN SPEED
c Press the MODE button to select
either COOLING or HEATING
mode.
TIMER SET
A
d When the test run starts, “TEST”
shows on the remote controller’s
display.
4
SET CL
TEST
ON
•
OFF •
e During the test run, the air
conditioner runs continuously
and the thermostat does not
control the system.
TEST / CHK
Alarm message
f After the test run, be sure to
press the
TEST RUN / CHECK button
ON / OFF operation
button
TEST / CHK button once again
to finish this mode and make
sure “TEST” is not shown on the
display.
1152_THS_I
CAUTION
The TEST RUN button is used only for servicing the air conditioner. Do not press this
button in normal operation, or the system may be damaged.
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4. Service procedures
(C) Check the sensor temperature readings
The air conditioner has thermo sensors which are used to control the unit.
❏ Each sensor has an address which is made up of the indoor unit address, and the
sensor address. The indoor unit address is used only when several units are hooked
up to one remote controller (group control). If there is only one unit, made up of one
indoor and one outdoor unit, then only the sensor address should be put in, as shown
in the procedure below.
Follow this procedure to display the temperature of each sensor:
a On the remote controller, press both TEST / CHK and CL buttons at the same time for
more than 4 seconds.
AIR FLOW
UNIT
A
MODE
UNIT No.
R.C.
AIM
No.
FLAP
°C
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SWEEP
SET TEMP.
SETTING
SET CL
ON
•
OFF •
TEST CHK
/
4
0356_M_I
b The UNIT No., the address and temperature of the sensors instead of its usual
information will flash on the display.
❏ Following example shows the UNIT No. (Indoor unit address) is fixed at 01– 01.
❑ In case of group control, select the UNIT NO. (Indoor unit address) which you want to
check with UNIT button.
❏ Each time you press the
,
(SET TEMP.) button you can select a different sensor,
and the display shows the sensor address and temperature as shown below.
UNIT No. (Indoor unit address)
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
Sensor address
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
Sensor temperature °C
SETTING
DATA
MONITOR
SET CL
ON
•
OFF •
TEST / CHK
0357_M_I
NOTE
Do not press TIMER SET button during the procedure.
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4. Service procedures
Refer to the table below for the relationship between the sensor address and the location of
the sensor.
Relationship between the sensor address and the location of sensor
Sensor Address
Location of Sensor (Themistor)
(CODE No.)
Indoor Unit
01
02
03
04
05
06
07
08
09
—
TH1
TH2
TH3
Indoor air suction Temp.
Indoor coil Temp. (E1)
Indoor coil Temp. (E2)
—
—
—
Electronic expansion valve open
—
Outdoor Unit 0A TH8
Discharge gas Temp.
0B
—
0C
—
0D TH7
Outdoor coil liquid Temp. (C2)
0E TH6
Outdoor coil liquid Temp. (C1)
0F
10
11
12
13
14
—
—
—
—
—
—
4
NOTE
In case there are no sensor equipped with the unit, “- - -” is shown on the display.
C Resetting the remote controller display to previous mode.
❏ To reset the display, press TEST / CHK button, then the remote controller will return
to previous mode.
(D) Find out about past service problems
The remote controller can memorize the max. 4 most recent alarm messages, so you can
see problems the unit has had, if any. Knowing what has already occurred and been fixed
helps you to know what to check at present.
❏ This function is usable even if the unit is not working.
❏ To display the past error codes, follow the procedure below.
Procedure:
a On the remote controller, press both TEST / CHK and SET buttons at the same time for
more than 4 seconds.
b Once in this mode, display changes from the normal display to service check display as
shown in the table below:
Display Change
NORMAL DISPLAY
SERVICE CHECK DISPLAY
(
)
È
Set temp.
È
È
È
Code No.
UNIT No.
UNIT No. (Indoor unit address
Alarm Message
)
Hours, Minutes
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4. Service procedures
This picture shows the service check display.
UNIT No.
UNIT No.
1–1
R.C.
No.
No.
CODE No.
Refrigerant
Circuit No.
CODE No.
CHECK
Alarm message
SERVICE
0358_M_I
c. A maximum of 4 alarm messages can be accessed by pressing either SET TEMP button
or
as follows.
MODE
Past
NOTE Pressing CL (Clear) button will clear
all the service history.
SET TEMP.
Present
Present
4
... accessed in order of “Past È Present”.
Past
FAN SPEED
... accessed in order of “Present È Past”.
0359_M_I
For example, if the last four alarm messages were, in order of occurrence from oldest to most
recent, P01, P02, P04, and most recently E01, then the display will be shown as below when
you press
button four times. The 5th time you press
button you can repeat the display,
then the first message will be shown again.
1
2
3
4
UNIT No.
R.C. No.
UNIT No.
R.C. No.
UNIT No.
R.C. No.
UNIT No.
R.C.
No.
CODE No.
CODE No.
CODE No.
CODE No.
CHECK
CHECK
CHECK
CHECK
SERVICE
SERVICE
SERVICE
SERVICE
UNIT No.
R.C. No.
CODE No.
If there are no alarm messages, the display shows:
Alarm message
CHECK
SERVICE
0360_M_I
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4. Service procedures
Important
Never press CL (clear) button unless you want to erase the accessed data in memory. Follow
the procedure below only when erasing is necessary.
❏ To erase accessed data, press the CL button.
❏ When erasing is finished,“----” mark appears on the controller’s display.
CAUTION
After checking the alarm messages, be sure to press the TEST / CHK button.
(E) Check the remote controller itself for correct operation
The remote controller has a self-diagnostic function to check if it works properly. Use this
procedure to find out if the remote controller itself is in trouble.
a Turn ON the RCU.CK switch on the back of the P.C.B. Ass’y in the remote controller. See
section (A) for exact location.
4
b The appearance of the display will tell you whether or not the remote controller is working
correctly or not.
❏ Normal condition – All displays appear for 10 seconds, then disappear.
❏ Unusual condition – All displays flash ON and OFF for 10 seconds, then disappear.
CAUTION
After checking the panel, be sure to set the RCU.CK switch to this original OFF
position.
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4. Service procedures
(F) Execute the auto. address operation
❏ Auto. address operation is executed by pressing the A. ADD (S1) button of outdoor
unit’s PCB usually.
For your convenience it can be executed by remote controller also.
a Press the TEST / CHK and
(
) buttons at the same time for more than 4 seconds.
b Set CODE No. A1 with
,
(SET TEMP) button.
In this mode, the auto. address
AIR FLOW
UNIT
operation is executed at each R.C.
(Refrigerant Circuit) line one by one.
MODE
R.C.
FLAP
SET TEMP.
FAN SPE
CODE No.
TIMER SET
SETTING
SET CL
ON
•
OFF •
TEST / CHK
4
0361_M_I
c Select R.C. No. which you want to execute the auto. address operation with UNIT button.
d Press the SET button. The auto. address operation will start. CODE No. changes from
flashing to ON state.
e If an error occurs during operation, the alarm message will be displayed. Check and
remove the cause. If you want to stop the operation, press the CL button then the unit
stands in waiting mode (Press the SET button again.)
f If the automatic address operation finishes, the display will disappear.
g Execute the operation of the other R.C. line in the same way by following the above steps
c to d .
h Complete the automatic address operation by pressing the TEST / CHK button.
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4. Service procedures
(G) Confirm and change the indoor unit address
❏ The purpose of the above function is to let you confirm the indoor unit address after
the auto. address operation, and change the indoor unit address if it is needed.
a Press the TEST / CHK and
(
) buttons at the same time for more than 4 seconds.
AIR FLOW
UNIT
MODE
R.C.
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
SET DATA
SET
ON
•
OFF •
TEST / CHK
4
0362_M_I
b Select the R.C. No. which you want to change with the UNIT (up) or FLAP (down)
buttons.
c Press the SET button (to confirm the R.C. No.).
The smallest registered indoor No. and the selected R.C. No. will be displayed.
Ex:
R.C. No. 3 is selected.
Indoor No. 2 is the smallest indoor No. of
the R.C. No. 3.
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
SET DATA
SET CL
ON
•
OFF •
TEST / CHK
0363_M_I
d Select the indoor No. which you want to change with UNIT button. Once in this mode, the
fan motor of selected indoor unit will turn on and let you confirm the indoor unit
address.
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4. Service procedures
e Set the required new indoor unit’s No. by pressing the
,
(
) button.
AIR FLOW
UNIT
MODE
Ex: UNIT No. 3-6: currently registered indoor unit address
Required new indoor No.8: SET DATA
R.C.
No.
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
SET DATA
SET
ON
OFF •
•
In this case, UNIT No. 3 – 6 (current)
*
TEST / CHK
=
3 – 8 (NEW : after pressin the
TEST / CHK button)
0364_M_I
f Press the SET button.
UNIT No, SET DATA (0008) and
SETTING
changes from flashing to ON state.
4
g If you made a mistake, press the CL button.
h Finally, press the TEST / CHK button.
i If you want to change the indoor unit address of the other R.C. No., follow the step ato h
in the same way.
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4. Service procedures
(H) Change the shift temperature in heating mode
❏ If the indoor unit is installed at high location (ex. ceiling level), the thermostat tends to turn off at
heating mode because of the hot air temperature around ceiling level. In order to solve the
problem, the shift temp. (valid while heating only) is set when shipped from factory.
❏ If the shift temp. is not enough (ex. the indoor unit is installed at position higher than 3 m), the
shift temp. can be set with remote controller from +1 to +10 deg (°C) <from +2 to 20 deg (°F)>.
manually as follows:
a Press the TEST / CHK button for more than 4 seconds.
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
SET DATA
SET CL
ON
•
OFF •
TEST / CHK
4
0365_M_I
b In case of group control, if you want to change all units in group control collectively,
proceed next step remaining ALL displayed.
If you want to change a unit individually, select the indoor unit address (UNIT No.) with
UNIT button.
c Select the CODE No. 06 with
,
(SET TEMP) button.
d Choose the shift temp with
,
(
) button.
EX:
UNIT No. 1–6
CODE No. 06
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
Shift temp. +5 deg (°C)
FLAP
<+10 deg (°F)>
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SET TEMP.
SETTING
SET DATA
SET CL
ON
•
OFF •
TEST / CHK
0366_M_I
e Press the SET button.
CODE No. 06, SET DATA and
SETTING
change from flashing to ON state.
f If you made a mistake, press the CL button.
g Finally, press the TEST / CHK button.
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4. Service procedures
( I ) Set the indoor unit address
❏ This function is usable if the auto. address operation is not available.
Indoor unit address can be set one by one by remote controller in such case.
NOTE
1) In case of group control, branch wiring for group control should be removed
temporarily.
2) In case of remote controllerless system, remote controller should be connected
with the indoor unit temporarily.
a Short the two terminals of DISP PIN on indoor unit PCB.
(DISP PIN : Refer to P. VI–2)
b Press the TEST / CHK , SET and CL buttons at the same time for more than 4
seconds.
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
FLAP
4
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
SET DATA
SET CL
ON
OFF •
•
TEST / CHK
0367_M_I
c Set the CODE No. 12 to set the No. of R. C. with the
,
(SET TEMP) button.
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
SET DATA
SET CL
ON
•
OFF •
TEST / CHK
0368_M_I
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4. Service procedures
d Set the No. of R. C. which you want to set with
,
(
) button.
Ex. No. of R. C. will be set 2.
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
SET DATA
ET CL
ON
OFF •
•
TEST / CHK
0369_M_I
e Press the SET button.
UNIT No., CODE No. 12,
SETTING
and SET DATA (0002) change from flashing to ON state.
4
f Select the CODE No. 13 to set the indoor unit No. with the
g Set the indoor unit No. which you want to set with the
,
(SET TEMP) button.
,
(
) button.
Ex. Indoor unit No. 4 will be set.
In this example, indoor unit address
(UNIT No.) will be set 2–4.
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
SET DATA
ET CL
ON
•
OFF •
TEST / CHK
0370_M_I
h Press the SET button.
UNIT No., CODE No. 13,
state.
SETTING
and SET DATA (0004) change from flashing to ON
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4. Service procedures
i Select the code No. 14 to set group setting with the
,
(SET TEMP) button.
j Set the No. of group setting as shown below with the
,
(
) button.
Nos. of group setting.
0 : Standard system (except group
control)
1 : Main indoor unit in case of group
control
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
2 : Sub indoor unit in case of group
control
99: No setting (at factory shipment)
SET DATA
SET CL
ON
•
OFF •
TEST / CHK
0371_M_I
k Press the SET button.
SETTING
UNIT No., CODE No. 14,
and SET DATA change from flashing to ON state.
4
l If you made a mistake, press the CL button so that setting returns to the initial state.
m Press the TEST / CHK button to finish this mode.
The display is disappeared.
n Confirm the indoor unit address (UNIT No.) with the UNIT button after pressing the ON /
OFF button.
o Finally, remove the short circuit of DISP PIN.
And in case of group control, be sure to restore the branch wiring to its original wiring. In
case of remote controller–less system, remove the remote controller.
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4. Service procedures
(J) Change the period of the filter timer
❏ If the period of filter timer is not suitable (for example in case of dirty environment), the
period can be shortened to half as follows:
a Press the TEST / CHK button for more than 4 seconds.
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SETTING
SET DATA
SET CL
ON
OFF •
•
TEST / CHK
0213_M_I
4
b In case of group control, if you want to change all units in group control collectively,
proceed next step remaining “ALL” displayed.
If you want to change a unit individually, select the indoor unit address (UNIT No.) with
UNIT button.
c Select the CODE No. 02 with
,
(SET TEMP) button.
d Change the No. from 0 to 1 with
,
(
) button.
EX:
UNIT No. 1–6
CODE No. 02
K type 150 hr
AIR FLOW
UNIT
MODE
UNIT No.
R.C. No.
→
75 hr
FLAP
SET TEMP.
FAN SPEED
CODE No.
TIMER SET
SET TEMP.
SETTING
SET DATA
SET CL
ON
•
OFF •
TEST / CHK
0214_M_I
e Press the SET button.
CODE No. 06, SET DATA and
SETTING
change from flashing to ON state.
f If you made a mistake, press the CL button.
g Finally, press the TEST / CHK button.
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4. Service procedures
Earthed wire
4-2 Checking the Electrical Components
Clip
(1) Measurement of Insulation
Resistance
•
The electrical insulation is acceptable
when the resistance exceeds 1 MΩ.
Probe
Insulation
tester
1
Power Supply Wires
Fig. 21
0638_X_S
Clamp the earthed wire of the Power
Supply wires with a lead clip of the
insulation resistance tester and mea-
sure the resistance by placing a probe
on either of the power wires. (Fig. 21)
Terminal plate
Then measure the resistance between
the earthed wire and the other power
wires. (Fig. 21)
Probe
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 the
terminal plate (Fig. 22)
4
Clip
Copper
tube or
metallic part
Insulation
tester
3
4
Outdoor Unit
Fig. 22
0639_X_S
Measure the resistance by placing a
probe on the terminal plate in the same
manner as explained above 2. (Fig. 22)
Probe
Measurement of Insulation Resistance
for Electrical parts
•
•
•
Disconnect the connector of the
desired electric part from terminal
plate, P.C.B. Ass’y, etc. (Fig. 23)
Clip
Copper
Similarly, disconnect the lead wires
from compressor, capacitor, etc.
(Fig. 24)
tube or
metallic part
Insulation
tester
Measure the resistance in the same
manner as illustrated on the right.
Fig. 23
0640_X_S
From fan motor,
compressor and other
parts.
Refer to Electrical Wiring Diagram.
NOTE
If the probe does not enter the hole
because the hole is too narrow, use a
probe with a thinner pin.
Probe
Metallic
part
Clip
Insulation
tester
0641_X_S
Fig. 24
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4. Service procedures
(2) Checking the Protective Devices
•
Disconnect the connector, which consists of P (plug) and S (socket) when you want to
check the protective device.
•
•
Then check continuity among plug’s (and/or socket’s) terminal as in Fig. 25.
Normality of the protective device can be judged by the following table.
The Protective Device is proved normal if there is a continuity between terminals.
socket
Multimeter
Ω
Fig. 25
4
0642_X_S
1
2
3
Indoor fan motor thermal protector (49FI) . . . . . . Indoor unit
•
•
Disconnect the connector which leads to the indoor fan motor (FMI).
Check the socket’s terminals.
Compressor motor thermal protector . . . . . . Outdoor unit
•
•
Disconnect the wires from terminals of compressor.
Check the terminals of compressor.
Outdoor fan motor thermal protector (49FO) . . . . . . Outdoor unit
•
•
Disconnect both the connector which leads to the outdoor fan motor (FMO).
Check socket’s terminal.
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4. Service procedures
(3) Checking the Electrical Parts
1
Power transformer (TR1) ..................... Indoor unit *Measure the coil resistance.
•
Primary 230-208V ; Measure the resistance between No.1 and No.3
(WHT lead wires) terminals of 3P (WHT) socket connected to
power transformer.
•
Secondary
14.8V ; Measure the resistance between No.1 and No.2
(RED lead wires).
14.8V ; Measure the resistance between No.3 and No.4
(BRN lead wires).
Refer to “1-3 Other component specifications”.
Power transformer (TR) .................... Outdoor unit *Measure the coil resistance.
2
•
Primary 230-208V ; Measure the resistance between No.1 and No.3
(WHT lead wires) terminals of 3P(WHT) socket jointed to power
transformer.
•
Secondary
14 V ; Measure the resistance between No.1 and No.2
(BRN lead wires).
4
Refer to “1-3 Other component specifications”.
Indoor fan motor (FMI) .........................Indoor unit *Measure the coil resistance.
3
•
Measure the resistance between each terminal of 7P (WHT) socket and 3P (YEL)
socket connected to the indoor fan motor.
Refer to “1–2–(A) Major component specifications”.
4 Outdoor fan motor (FMO) .....................Outdoor unit *Measure the coil resistance.
•
Measure the resistance in the same manner as explained above 3.
Refer to “1–2–(B)Major component specifications”.
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4. Service procedures
5
Motor capacitor ............ Both in indoor and outdoor unit
• Remove the lead wires from the capacitor terminals, and then place a probe on the capacitor
terminals as shown in Fig. 26. Observe the deflection of the pointer, setting the resistanc
measuring range of the multimeter to the maximum value.
• The capacitor is “good” if the pointer bounces to a great extent and then gradually
returns to its original position.
NOTE
The range of deflection and the deflection time
differ according to the capacity of the capacitor.
Multimeter
Ω
4
Compressor motor
capacitor
Fan motor
capacitor
1041_X_S
Fig. 26
6
Continuity of fuse on P.C.B. Ass’y
•
Check for continuity using a multimeter
as shown in Fig. 27.
Fuse
NOTE
Method Used to Replace Fuse on PCB Ass’y
1. Remove the PCB Ass’y from the electrical compo-
nent box.
1042_X_S
Fig. 27
Soldering iron
2. Remove the fuse from PCB Ass’y using pliers while
heating the soldered leads on the back side of the
PCB Ass’y with a soldering iron (30W or 60W).
(Fig. 28)
PCB Ass’y
Fuse
3. For replacement, insert a fuse of the same rating to
the intended position and solder it.
Varistor
(Allow time to radiate heat during soldering so that
the fuse does not melt.)
When replacing the fuse, be
Pliers
sure not to break down the
varistor.
CAUTION
1043_X_S
Fig. 28
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4. Service procedures
7
8
9
Solenoid coil of the electronic refrigerant
*Measure the coil resistance.
control valve (ERCV) ………… Indoor unit
•
Measure the resistance between No. 5 (GRY lead wire) and other terminals (another color of
lead wires) of 5P (WHT) plug connected to the solenoid coil.
Refer to “1-2-(A) Major component specifications”.
Compressor motor (CM) ……… Outdoor unit
In case of single -phase compressor
*Measure the coil resistance.
•
Remove the cover of compressor terminal and measure the resistance
between terminals.
Refer to “1-2 Major component specifications”.
Compressor motor magnetic contactor (52C) ………… Outdoor unit
•
Measure the resistance between A (ORG lead wire) and B (GRY lead wire) terminals on
the compressor motor magnetic contactor.
Refer to “1-3 Other component specifications”.
Check the continuity between contactors.
4
•
FMCA–1UL
MODEL
Push button on
the magnetic
contactor
Pair of terminals
R – U S – V T – W 31 – 32
no press
press
––––
YES
––––
YES
––––
YES
YES
––––
0
Solenoid coil of 4-way valve (20S) … Outdoor unit
*Measure the coil resistance.
•
Measure the resistance between No.1 (BLK lead wire) and No.2 (BLK lead wire) terminals
of 2P (BLK) socket connected to the solenoid coil.
Refer “1-3 Other component specifications”.
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4. Service procedures
(4) Sensor and Solenoid Layout Diagram
Indoor Unit
• XHS2432
Electronic expansion valve
TH2 (E1), (RED)
TH3 (E2), (BLK)
1582_X_I
Outdoor Unit
• CH2432
4
TH6, 7, 8
20S
TH7 (C2), (RED)
TH8 (GRN)
( Discharge gas)
63PH
TH8
(GRN)
CM
CH
TH6 (C1), (BLK)
1153_THS_I
1154_THS_I
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4. Service procedures
(4) Sensor and Solenoid Layout Diagram
Indoor Unit
• XHS3632
Electronic expansion valve
TH2
(E1), (RED)
TH3 (E2), (BLK)
1583_X_I
Outdoor Unit
• CH3632
4
TH6, 7, 8
TH7 (C2), (RED)
20S
63PH
TH8 (GRN)
( Discharge gas)
TH6 (C1), (BLK)
CM
CH
0585_C_S
0584_C_S
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4. Service procedures
(5) Thermistor Characteristic Curve
(2) Indoor heat exch.
coil sensor
(1) Room temp. sensor : TH1 (KTEC-35)
: TH2(E1), TH3(E2)
Outdoor heat
exch. coil sensor : TH6(C1), TH7(C2)
( PBC-41E)
40
35
10
9
8
7
6
5
4
3
2
1
30
25
20
15
10
4
5
0
–4
5
14
23
32
41
50
59
68
50
59
68
77
86
95 104
Temperature (°F)
1045_M_I
Temperature (°F)
1044_M_I
(3) Compressor discharge gas temp. sensor : TH8 (PTC-51H)
7
6
5
4
3
2
1
176
194
212
230
248
266
Temperature (°F)
1149_THS_I
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4. Service procedures
(6) P.C.B. Setting
● Setting of outdoor control P.C.B.
(A) Standard control (single outdoor unit)
In case of single outdoor unit installation, no indoor unit’s setting is necessary for twin,
triple or quartet types (2, 3 or 4 indoor units).
Leave R.C. address setting at “0” as factory shipment state.
In this case, auto. address operation is performed automatically for the first time when the
power is switched on. This operation takes about a few minutes.
(B) Group control (Multiple outdoor units)
In case of group control (up to 8 indoor units can be connected with one *wired remote
controller), before turning on the power supply, set the R.C. address with S2, S3 on the
outdoor control P.C.B..
R.C. address: Refrigerant circuit address 1 ~ 30.
Regarding the example of R.C. address for group control, please refer to R.C. Address
Setting Method.
4
(C) Central control (when using the *system controller)
In case of central control (when using the system controller,that is, when linking outdoor
units in a network),
(a) Before turning the power supply on, set the R.C. address with S2, S3 on the outdoor
control P.C.B..
(b) Remove the short plug (CN4, 2P Black) from all outdoor units except one outdoor
unit.
Regarding the example of R.C. address for central control and the position of CN4,
please refer to R.C. Address Setting Method.
* Temperature displaed on both controllers are not °F but °C.
● Setting of indoor control P.C.B.
No setting is necessary.
Each indoor unit address (UNIT No.: R.C. – No.) is decided after auto. address operation.
Indoor unit No.
Refrigerant Circuit No. (R.C. address)
Manual setting for indoor unit address can be performed also by remote controller.
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4. Service procedures
(7) R.C. Address Setting Method
Outdoor unit R.C. address setting method
In case of group control or central control, set the R.C. address to 1, 2, 3, ... according to the
No. of outdoor units.
Outdoor control PCB
CN4 (2P Black)
Refrigerant circuit address
(factory setting = 0)
Refrigerant circuit address (black)
0
: S2
Refrigerant circuit address
(2P DIP switch, green or Blue)
10
20
position position
ON
ON side
: S3
OFF side
A. ADD (S1):
Automatic address setting start button
Used for central control (link system)
and group control (Normally, not used)
1
2
1126_C_I
4
R.C. address
(S3: 2P dip switch, green or Blue)
R.C. address
R.C. address
00 auto address
(S2: Rotary switch, Black)
ON
ON side
0
Both OFF
Both OFF
Both OFF
Set to 0
(“0” when shipped from factory)
1
2
OFF side
ON side
ON
02 (In case of No. 2 outdoor unit)
Set to 2
Set to 3
1
2
2
2
OFF side
ON side
ON
03 (In case of No. 3 outdoor unit)
1
OFF side
ON side
ON
1
11 (In case of No. 11 outdoor unit) 10’s SW is ON
Set to 1
1
OFF side
ON side
ON
21 (In case of No. 21 outdoor unit) 20’s SW is ON
Both 10’s and 20’s
Set to 1
1
2
2
OFF side
ON side
ON
0
30 (In case of No. 30 outdoor unit)
Set to 0
switches are ON
1
OFF side
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4. Service procedures
NOTE
(8) Automatic Address Setting Method
Required time for auto. address operation:
In case of group control : a few minutes for
each R.C.
— For group control and central control with
multiple outdoor units —
In case of central control : max. about 20
min. for each
Carry out automatic address setting with
the remote controller.
R.C.
1) All auto. address operation
(9) Displaying Indoor / Outdoor Unit
Combination Numbers
1 Press the TEST / CHK and
(
)
buttons at the same time for more
than 4 seconds.
2 Press the SET button after
Display the indoor / outdoor unit address after
confirming the CODE No. AA (CODE automatic address setting.
No. AA: All Auto. address operation). 1) When installing multiple units, match the
indoor unit address numbers and the
After addresses are automatically set
outdoor R.C. address numbers and
in order for the outdoor units from
display them at an easy-to-check location
No. 1 to No. 30, the system returns
(near the nameplate) with an oil-based
to the normal stopped state.
magic marker or other indelible marker
so that the individual indoor and outdoor
unit combinations can be checked.
2) Individual auto. address operation for
each refrigerant circuit
1 To select each refrigerant circuit
4
Example:
individually and set addresses
Outdoor Unit 1 – Indoor Units 1-1, 1-2,
automatically, press the TEST / CHK
1-3, ....
and
(
) buttons at the same
Outdoor Unit 2 – Indoor Units 2-1, 2-2,
2-3, ....
time for more than 4 seconds, then
press the (SET TEMP) button
,
once to set CODE No. A1.
(CODE No. A1: Auto. address
operation)
2) Displaying indoor / outdoor unit address
is necessary for maintenance. Always
label numbers.
2 Select R.C. No. which you want to
execute the auto. address operation
with UNIT button.
*Check indoor unit address with the
remote controller. Press the TEST / CHK
button for at least 4 seconds and check
the indoor unit address with the UNIT
button. (Each time you press the UNIT
button, the address changes 1-1, 1-2, ...
2-1, 2-2, ...) The fan for only the selected
indoor unit turns on at high speed, so
check which indoor unit runs and label
the indoor unit address.
(If there is 1 outdoor unit, the addresses
are 1-1, 1-2, ...)
When you press the TEST / CHK button
again, the system returns to normal
remote control mode.
3
Press the SET button. The auto. address
operation will start. CODE No. changes
from flashing to ON state.
4 If the error occurred during the
operation, the alarm message will be
displayed. Check and remove the
cause. If you want to interrupt the
operation, press the CL button then
the unit stands in waiting mode
(Press the SET button).
5 If the auto. address operation
finishes, the display will disappear.
6 Execute the operation of the other
R.C. line in the same way by
following the above steps 2 to 3.
7
Complete the auto. address operation by
pressing the TEST / CHK button.
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4. Service procedures
(10) Items to Check Prior to Test Run
1) Turn on the power supply switch more
than 5 hours before in order to charge
the crank case heater.
2) Fully open the outdoor service valve after
making the leak inspection of field
connected tubing, vacuuming, and gas
charging if necessary.
3) Check the capacity code setting.
* The factory setting is as shown in the
table below check it.
* The capacity code is set by S4 (green
or Blue 4P DIP switch) on outdoor
control P.C.B..
4
Outdoor control PCB
S4 (green or Blue) capacity code
(4P DIP switch)
ON
ON side
1
2
3
4
OFF side
1127_C_I
S4. Capacity code
No.
Outdoor PCB
Model No.
1
2
3
4
24 type (1 phase) ON ON ON OFF
36 type (1 phase) OFF ON OFF ON
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4. Service procedures
(11) Test Run
(11)-1. Preparing for Test Run
Before starting the air conditioner, check the
followings:
All OFF for
initial settings.
ON
OFF
Operation
selector
1 2 3 4
ON
OFF•O
•
I
1
2
3
4
ADDRESS
SWEEP
1. TEST RUN(ON)
2. PCB CHK.(ON)
3. RCU MAIN(OFF)
1
2
3
NORM. HOLD
1. TEST RUN
2. (OFF)
3. (OFF)
/
SUB(ON)
4. OFF
(1) Remove all loose matter from the cabinet espe-
cially metal filings, bits of wire, and clips.
(2) Connect the control wiring correctly and tighten
all electrical connections.
4. (ON)
(3) Remove the protective spacer for the compressor
used for transportation.
(4) Connect the power to the unit for at least 5
hours before starting the compressor. The
bottom of the compressor should be warm to the
touch and the crankcase heater around the feet
of the compressor should be hot to the touch. For
Ceiling mounted and Recessed Type indoor
units, the flap(s) move(s) for one minute when the
power is connected to the unit.
Air filter
Air intake grille
1584_M_I
Fig. 11-1
4
This is not the malfunction.
(5) Open both the wide and narrow tube service
valves after air purge.
(6) Remove the transportation cardboard protection
for the indoor fan.
(11)-2. Performing Test Run
Be careful since the fan will
CAUTION
start when performing Test
Run.
For XHS models
(1) For XHS models, the Operation Selector is located
above the electrical component box inside the
indoor unit. To access the Operation Selector,
press the two latches of the air intake grille in the
direction of the arrow to open the grille. Open the
air intake grille downward. (Fig. 11-1)
(2) Set the TEST RUN switch of the SERVICING
switches on the Operation Selector (housed inside
the indoor unit) to the ON position. (Fig. 11-1)
(3) Press the ON/OFF operation button on the
remote control unit and start the air conditioner in
Cooling or Heating mode.
(4) Let the unit run for about 30 minutes and check
that the unit operates normally.
(5) After the test run, be sure to set the TEST RUN
switch back to the OFF position to cancel the test
run mode. Then stop the air conditioner.
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4. Service procedures
Important
Set the Operation Selector at the “ON” position. Other-
wise the unit will stop or will not run correctly.
The TEST RUN switch is used
only for servicing the air
conditioner. DO NOT use this
switch for normal operation.
Otherwise, it may put stress
on the system.
CAUTION
NOTE
● During the test run, all of the 3 indicator lamps on the
indoor unit will flash.
● During the test run, the air conditioner runs continu-
ously and the thermostat does not control the sys-
tem.
● To protect the air conditioner from overloading, the
outdoor unit will not start running for 3 minutes after
power is applied or the air conditioner is turned off
and then back on.
4
● When the air conditioner fails to start the test run, 1
or more of the 3 alarm indicator lamps on the indoor
unit will flash.
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4. Service procedures
(11)-3. Test Run Procedure
Start
Yes
Turn on RCU address SW
of sub remote control unit
Multiple remote
control?
No
Recheck the test items before test operation.
Check the indoor and outdoor unit combination (wiring).
Single type?
Multiple indoor
units for one outdoor
units?
Yes
Yes
No
(One indoor unit and one
remote controller for one
outdoor unit)
Turn on power supply for indoor units side
first. Then turn on power supply for outdoor
unit side.
No
Group control
for multiple outdoor
units?
Yes
Set the outdoor unit R.C. address.
Turn on power supply switch.
Go to next
R.C. line
No
Press A. ADD (S1) button.
or
Execute auto. address operation with the
remote controller.
No
4
Yes
Finish all
R.C. line?
Central control
for multiple outdoor
units?
Yes
CN4: Open (*)
Set the outdoor unit R.C. address.
Turn on power supply switch.
Go to next
R.C. line
No
Press A. ADD (S1) button.
or
No
Execute auto. address operation with the
remote controller.
Yes
Finish all
R.C. line?
Display the combination number.
Set the remote controller to test operation.
No
Check according the self-diagnostics function table,
and if you find defective parts, repair them according to
Service Manual.
Does the unit work?
Note: Check the indoor side drain water.
Yes
Return the remote controller to normal.
End
1585_M_I
NOTE
1) One of CN4 of all linked outdoor units shold be short.
2) In case of using system controller, zone registration is required after finishing Test run.
Regarding the zone registration, please refer to Installation Instructions attached with system controller.
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4. Service procedures
(12) P.C.B. and Parts Location
● P.C.B. (CR-THS2432) FOR INDOOR UNITS
CN80 (RED) : 26H
CN77 (GRN) : LM
CN78 (BLU) : DP
F2 : Fuse 250V / 3A
CN74 (WHT) : PRY
CN73 (BLK) : SUP
CN85 (BLU) : DPH
CN81 (GRY) : 49FI
F1 : Fuse 250V / 3A
CN84 (YEL) : COM
CN75 (WHT) : SEC
CN83 (WHT) : FMI
4
JP1 (Jumper wire)
: For sellecting the
signal of T10.
Shipment state
: Pulse signal
CR-THS2432
CN9 (RED) : FS
Jumper cut
: Static signal
CN71 (YEL) T10
: External input and
output terminal
E2P-ROM
CN30 (BRN) : COIL E3
CN70 (WHT) : T6
CN6 (RED) EXCT
: Forced thermostat
OFF input terminal
CN32 (BLK) : COIL E2
CN31 (RED) : COIL E1
CN33 (YEL) : ROOM TEMP
CN1 (WHT) : DISP PIN
CN2 (WHT) : CHECK PIN
CN3 (WHT) : TEST PIN
CN5 (WHT) : FORCED OPR
CN44 (BRN) : SG2
CN40 (BLU) : SG1
F3 : Fuse 125V / 0.5A
CN41 (BLU) : Wired remote controller
CN42 (BLU) : For wireless remote controller
CN35 (GRN) : PNL
1128_THS_I
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4. Service procedures
(12) P.C.B. and Parts Location
● P.C.B. (CR-CH2432) FOR OUTDOOR UNITS
CN21 (YEL) : 20S
CN22 (BLK) : 52C
CN23 (RED) : 63PH
CN20 (WHT) : PRY
F2 : Fuse 250V / 3A
F1 : Fuse 250V / 3A
CN19 (BLU) : SUP
CR-CH2432
4
CN3 (BRN) : SG2
CN2 (BLU) : SG1
F3 : Fuse 125V / 0.5A
S2 (BLK)
: R.C. address
0
D11, D12 (RED)
: MESSAGE LAMP
CN4 (BLK) : LINK SYSTEM
S3 (GRN or BLU)
: R.C. address
CN12 (WHT) : CT1
S4 (GRN or BLU)
: Capacity code
D14 (RED) : POWER LAMP
S1 (A. ADD)
: AUTO ADDRESS
BUTTON
CN11 (YEL)
: TEST PIN
CN1 (WHT) : SEC
CN13 (BLK) : C1
CN14 (RED) : C2
CN7 (RED) : CHECK PIN
CN8 (WHT) : CK.L PIN
CN9 (WHT) : CK.H PIN
CN15 (GRN) : DISCHARGE
1129_THS_I
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4. Service procedures
(13) Checking procedure for each P.C.B.
The indoor and outdoor P.C.B. have functions to check the signal transmission and reception of the
serial circuit and to check the microcomputer operation. (Self-diagnosis function)
● Precautions required when checking
1. After turning off the power to the indoor (outdoor) unit, remove the inter-unit control wiring (U1-U2)
and create a short-circuit between U1 and U2.
2. Short the CHECK PIN on the PC board of the indoor (outdoor) unit and turn on the power.
3. When checking the Outdoor controller, remove the compressor wiring from the compressor
electromagnetic contactor.
4-1. Checking the serial circuit
Indoor controller: A lighted LED indicates normal. A blinking LED indicates abnormal.
Outdoor controller: Blinking LEDs (D11 and D22) indicate normal. If one of the LEDs (D11 and D22)
goes off, it indicates abnormal.
4-2. Checking microcomputer operation
When the microcomputer works normally, the relays are switched in sequence as below.
4
Indoor controller
Output
ON time
Indoor fan Very high fan speed (HH) 0.5 seconds
Indoor fan High fan speed (H)
Indoor fan Low fan speed (L)
Indoor fan Very low fan speed (LL)
Flap motor
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
Drain pump
Operation order Electric heater
Operation signal
In a lump
Electronic control valve A
Electronic control valve B
Electronic control valve.A
Electronic control valve B
Outdoor controller
Output
ON time
Outdoor fan High fan speed (H)
Outdoor fan Low fan speed (L)
4-way valve
0.5 seconds
0.5 seconds
0.5 seconds
0.5 seconds
Operation order
Compressor
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4. Service procedures
(14) Check Pins
When shorting check pins on the indoor and outdoor PCBs, operations shown on the above table will be
performed on each indoor and outdoor unit. Use check pins to perform a quick check.
NOTE
• When checking pin operation, stop the indoor and outdoor units with the remote control unit.
(14)-1. FORCED OPR pin of the indoor controller
● Switch the pin from normal operation to check operation
• Relay RY6 turns ON ➞ Indoor fan motor operates at the “H” fan speed.
• Relay RY2 turns ON ➞ Dew prevention heater (DPH) turns ON.
➞ Indoor flap motor moves to the F1 position.
• Electronic control valve opens fully. (480 steps)
NOTE
• Even if the remote control unit is not connected, the indoor unit operates independently.
(14)-2. Shorting CK.L or CK.H pin of the outdoor PCB
4
● When shorting the cooling pin (CN8) with normal operation
• Relay RY3 is turned ON for 3 seconds
• Relay RY4 is turned ON for 3 seconds
➞ The outdoor fan motor operates at the “LL” fan speed.
➞ The outdoor fan motor oprates at the “H” fan speed.
• Turn ON relay RY2 under the above condition ➞ The magnet switch (52C) turns ON.
It will take about 18 seconds before cooling operation begins.
● Shorting the heating pin (CN9) with normal operation
• Relays RY3 and RY4 are turned ON for 3 seconds ➞ The outdoor fan motor operates at the “H” fan speed.
• Relay RY3 is turned ON for 3 seconds
➞ The outdoor fan motor operates at the “LL” fan speed.
➞ The magnet switch (52C) turns ON. If relay RY1 is
turned ON, the 4-way valve (20S) turns ON.
• Turn ON relay RY2 under the above conditions
It will take about 18 seconds before heating operation begins.
NOTE
• The outdoor unit operates independently regardless of the indoor unit’s operation. However, the outdoor unit
does not defrost.
• The indoor and outdoor units stop when the outdoor protection apparatus activates during the checking
operation, and automatically restarts, unlike in normal operation.
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– 105 –
• The specifications, designs, and information in this brochure are subject to change without notice.
SANYO FISHER Service Company
CENTRAL REGION
1739 Sands Place, Suite G
Marietta, GA 30067
Phone: (770) 951-8284
Fax: (770) 951-2077
Jan. / 2000
Printed in U.S.A.
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