38MVC/40MVC
38MVQ/40MVQ
Comfortt S e r i e s H i g h --- Wa l l D u c t --- Fr e e S p l i t S y s t e m
Sizes 009 --- 024
Service Manual
TABLE OF CONTENTS
SAFETY CONSIDERATIONS
PAGE
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
STANDARD FEATURES AND ACCESSORIES . . . . . . . . . . . 2
SPECIFICATIONS -- COOLING ONLY . . . . . . . . . . . . . . . . . . 3
SPECIFICATIONS -- HEAT PUMP UNITS . . . . . . . . . . . . . . . 4
DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SERVICE VALVE LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . 5
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SYSTEM OPERATING ENVELOPE . . . . . . . . . . . . . . . . . . . . 7
ELECTRICAL DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
CONNECTION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . 9
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 -- 16
REFRIGERATION CYCLE DIAGRAM . . . . . . . . . . . . . . . . . 17
REFRIGERANT LINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SYSTEM EVACUATION AND CHARGING . . . . . . . . . . . . . 19
CONTROL SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SYSTEM SAFETIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3 MINUTE TIME DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
COMPRESSOR OVERCURRENT PROTECTION . . . . 20 -- 21
SEQUENCE OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . 21
MODES OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . 22 -- 24
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . 25 -- 37
APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 -- 43
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes and
National Electrical Code (NEC) for special requirements.
!
Recognize safety information. This is the safety--alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand these signal words: DANGER, WARNING, and
CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.
INTRODUCTION
Section
1
of this Service Manual provides the necessary
information to service, repair, and maintain the EEZ family of
Puron air conditioners and heat pumps. Section 2 of this manual is
an appendix with data required to perform troubleshooting. Use
the Table of Contents to locate a desired topic.
STANDARD FEATURES AND ACCESSORIES
Ease Of Installation
Mounting Brackets
Low Voltage Controls
INDOOR UNITS
S
S
Comfort Features
Microprocessor Controls
Wireless Remote Control
Automatic Air Sweep
Air Direction Control
S
S
S
S
S
S
S
S
Auto Restart Function
Cold Blow Protection On Heat Pumps
Turbo Mode On Sizes 9K and 12 K
Auto Changeover On Heat Pumps
Energy Saving Features
Sleep Mode
S
S
A07892
Stop/Start Timer
Fig. 1 – Condensate Pump
Safety And Reliability
3 Minute Time Delay For Compressor
Over Current Protection For Compressor
Indoor Coil Freeze Protection
Indoor Coil High Temperature Protection On Heat Pumps
Condenser High Temperature Protection On heat Pumps{
Accumulator On Heat Pumps
Ease Of Service And Maintenance
Cleanable Filters
S
S
S
S
S
S
On high wall fan coils, the condensate pump has a lift capability of
18 ft (5.5 m) or the discharge side with the pump mounted in the
fan coil or 6 ft (1.8 m) on the suction side if the pump must be
remote mounted. The pump mounts inside the unit with quick
plug--in connections, and is recommended when adequate drain
line pitch cannot be provided, or when the condensate must move
up to exit.
S
S
S
S
NOTE: An external 115v power source will be required to run the
pump on unit sizes 9k and 12k.
Diagnostics
Liquid Line Pressure Taps
Suction And Discharge Pressure Taps (Sizes 18 and 24K)
Application Flexibility
OUTDOOR UNITS
Low Ambient Controls (---20˚F)
Condensate Pumps
Crankcase Heater
Wind Baffles
Warranty
5 ---Year Compressor Warranty
1 --- Parts Warranty
Compressor Extended Warranty Years 6 Thru 10
A
A
A
F
LOW AMBIENT KIT
The kit controls condenser fan cycling using a pressure switch. It is
specifically designed to control fan--motor cycles in response to
saturated condensing pressure. This device maintains a constant
saturated condensing temperature of 100 _F ± 10 _F (37.78_C ±
--12.22 _C) at outdoor--air temperatures between 55 _F and --20 _F
(12.78_C ± --12.22_C), and can be used on all outdoor units
without changing the outdoor fan motor.
S
S
O
O
All Parts And Labor Years 2 Thru 5
All Parts And Labor Years 2 Thru 5, Compressor Years 6
Thru 10
CRANKCASE HEATER
Available for units with rotary compressors. Heater clamps around
compressor oil sump. Recommended for low--ambient applications
on sizes 9, 12 , 18, 24 and long line applications.
O
{ Sizes 18k & 24k
Legend
S Standard
A Accessory
O Optional
F Field Fabricated
3
SPECIFICATIONS -- COOLING ONLY UNITS
System Model Number
System Voltage
Control Voltage
Capacity (Btuh)
SEER
5 3 M V C 0 0 9 --- --- --- 1
115 V
5 3 M V C 0 1 2 --- --- --- 1
115 V
5 3 M V C 0 1 2 --- --- --- 3
208/230
0 --- 1 2 P u lse DC
12000
5 3 M V C 0 1 8 --- --- --- 3
208/230
0 --- 1 2 P u lse DC
9000
0 --- 1 2 P u lse DC
12000
Pulse DC
18000
13.0
13.0
13.0
13.0
Refrigerant Type
Design Pressure (PSIG)
Metering Device
Charge (lb)
R---410A
550
2.3
550
550
550
4.4
Capillary Tube in Outdoor Unit
2.9
3.0
Type
Rotary
Model
O il C h a r g e ( P O E --- o z )
Capacitor
Rated Current (RLA)
Locked Rotor Amp (LRA)
Rpm/CFM
Diameter (in) .. No. of Blades
Motor (hp)
EA82X1C---1FZDU1
11.8
EA108X1C---1FZDU1
PA108X1C---3FZDU
11.8
PA150X2CS---3KUU
25.4
11.8
45µF/250VAC
9.9
45µF/250VAC
7.5
35µF/370VAC
5.2
40µF/370VAC
7.3
40
47
21
32.6
900/1060
15.8 … 3
0.102
900/1090
15.8 … 3
0.102
900/1120
15.8 … 3
0.102
840/1470
18.1 … 3
0.224
Capacitor
6.5µF/260VAC
4.05
6.5µF/260VAC
3.94
2.5µF/450VAC
3.94
3µF/450VAC
5.51
Face Area (sq. ft)
No. Rows
2
2
2
4
Fins per inch
17
17
17
18
Circuits
4
20/.034
1250/325
1000/260
800/190
3.84 … 25.87
2.15
4
20/.034
1270/425
1100/365
1000/340
4.17 … 25.2
2.54
4
20/.034
1270/425
1100/365
1000/340
4.17 … 25.2
2.54
4
25/.044
1070/630
1000/570
960/500
4.21 … 37.6
4.36
Motor Watts/HP
Rpm/Cfm (High)
Rpm/Cfm (Medium)
Rpm/Cfm (Low)
Blower Diameter … Length (in)
Face Area (sq. ft)
No. Rows
2
2
2
2
Fins per inch
19.5
19.5
19.5
19.5
Circuits
2
3
3
6
Connection Type
Liquid (Mix Phase) (in) OD
Vapor Line (in) OD
Condensate Drain (in)
Maximum Length (ft)
Max Lift (Fan Coil Above) (ft)
Max Drop (Fan Coil Below) (ft)
Flare
1/4”
3/8”
1/4”
1/2”
1/4”
1/2”
1/4”
1/2”
.65 (OD) .53 (ID)
.65 (OD) .53 (ID)
.65 (OD) .53 (ID)
.65 (OD) .53 (ID)
65
35
35
65
35
35
65
35
35
100
50
50
4
SPECIFICATIONS -- HEAT PUMP UNITS
System Model Number
System Voltage
Control Voltage
Capacity (Btuh)
SEER
5 3 M V Q 0 0 9 --- --- --- 1
5 3 M V Q 0 1 2 --- --- --- 1
5 3 M V Q 0 1 2 --- --- --- 3
208/230
0 --- 1 2 P u lse DC
12000
5 3 M V Q 0 1 8 --- --- --- 3
208/230
Pulse DC
18000
115 V
0 --- 1 2 P u lse DC
9000
115 V
0 --- 1 2 P u lse DC
12000
13.0
13.0
13.0
13.0
HSPF
7.7
7.7
7.7
7.7
Refrigerant Type
R---410A
Design Pressure (PSIG)
Metering Device
550
550
550
550
Capillary Tubes in Outdoor Unit
Charge (lb)
2.35
3.0
3.0
Type
Rotary
Model
EA82X1C---1FZDU1
EA108X1C---1FZDU1
PA108X1C---3FZDU
PA150X2CS---3KUU
O il C h a r g e ( P O E --- o z )
Capacitor
Rated Current (RLA)
Locked Rotor Amp (LRA)
11.8
45µF/250VAC
11.8
45µF/250VAC
11.8
35µF/370VAC
25.4
40µF/370VAC
7.3
7.5
40
9.9
47
5.2
21
32.6
Rpm/CFM
900/1060
15.8 … 3
0.102
900/1090
15.8 … 3
0.102
900/1120
15.8 … 3
0.102
840/1470
18.1 … 3
0.224
Diameter (in) .. No. of Blades
Motor (hp)
Capacitor
6.5µF/260VAC
6.5µF/260VAC
2.5µF/450VAC
3µF/450VAC
Face Area (sq. ft)
No. Rows
4.05
2
3.94
2
3.94
2
5.51
4
Fins per inch
17
17
17
18
Circuits
Motor Watts/HP
Rpm/Cfm (High)
Rpm/Cfm (Medium)
Rpm/Cfm (Low)
Blower Diameter … Length (in)
Face Area (sq. ft)
No. Rows
4
20/.034
1250/325
1000/260
800/190
3.84 … 25.87
2.15
4
20/.034
1270/425
1100/365
1000/340
4.17 … 25.2
2.54
4
20/.034
1270/425
1100/365
1000/340
4.17 … 25.2
2.54
4
25/.044
1070/630
1000/570
960/500
4.21 … 37.6
4.36
2
2
2
2
Fins per inch
19.5
19.5
19.5
19.5
Circuits
2
3
3
6
Connection Type
Liquid (Mix Phase) (in) OD
Vapor Line (in) OD
Condensate Drain (in)
Maximum Length (ft)
Max Lift (Fan Coil Above) (ft)
Max Drop (Fan Coil Below) (ft)
Flare
1/4”
3/8”
1/4”
1/2”
1/4”
1/2”
1/4”
1/2”
.65 (OD) .53 (ID)
.65 (OD) .53 (ID)
.65 (OD) .53 (ID)
.65 (OD) .53 (ID)
65
35
35
65
35
35
65
35
35
100
50
50
5
DIMENSIONS -- INDOOR
A07336
W
H
D
Weight lb (kg)
Model Size
in. (mm)
in. (mm)
in. (mm)
24.2 (11)
33.0 (15)
55.0 (25)
55.0 (25)
9K
12K
18K
24K
32.09 (815)
35.67 (906)
49.21 (1250)
49.21 (1250)
11.02 (280)
11.26 (286)
12.80 (325)
12.80 (325)
7.68 (195)
9.25 (235)
9.06 (230)
9.06 (230)
DIMENSIONS -- OUTDOOR
Air Flow
W
L1
35
A07337
Weight lb (kg)
Heat Pumps
W
H
L1
in. (mm)
L2
in. (mm)
L3
in. (mm)
Weight lb (kg)
Cooling Only
Model Size
in. (mm)
in. (mm)
77.0 (35)
85.8 (39)
125.4 (57)
159.5 (72)
79.2 (36)
9K
30.71 (780)
29.92 (760)
33.07 (840)
31.16 (893)
21.26 (540)
23.23 (590)
27.36 (695)
33.86 (860)
21.61 (549)
20.87 (530)
22.05 (560)
23.11 (588)
11.81 (300)
12.40 (315)
14.17 (360)
13.98 (355)
10.87 (276)
11.42 (290)
13.19 (335)
13.11 (333)
90.2 (41)
125.4 (57)
160.6 (73)
12K
18K
24K
SERVICE VALVE LOCATIONS
24K
12K
18K
9K
K
J
J
K
J
J
K
K
A07376a
9K
12K
18K
24K
Service Valve Locations
in. (mm)
3.46 (88)
3.46 (88)
in. (mm)
in. (mm)
3.46 (88)
3.62 (92)
in. (mm)
J
K
3.19 (81)
5.63 (143)
4.02 (102)
6.57 (167)
6
CLEARANCES -- INDOOR
6
"
(0.15m) min.
5
"
5
"
(0.13m)
min.
(0.13m)
min.
(1.8m)
6'
A07891
Fig. 2 – Indoor unit clearance
CLEARANCES -- OUTDOOR
A
Air-inlet
E
D
B
C
Air-outlet
A07894
UNIT
9k and 12k in. (mm)
24 (610)
18k and 24k in. (mm)
24 (610)
A
B
C
D
E
24 (610)
24 (610)
4 (102)
12 (305)
36 (914)
24 (610)
12 (305)
12 (305)
Fig. 3 – Outdoor Unit Clearance
7
SYSTEM OPERATING ENVELOPE
53MVC/MVQ System Operating Envelope Chart
Outdoor Temperature (ºC)
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
15
20
25
30
35
40
45
50
55
60
120
110
100
90
60
55
50
45
40
35
30
25
20
15
10
5
85º
80
80ºF
Cooling
Continuous
Operation
Heating
Continuous
Operation
70
62ºF
60
55ºF
125º
55º
75ºF
50
5ºF
40
0
-10
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
Outdoor Temperature (ºF)
Use low ambient control if the unit will operate in cooling at ambient conditions below 55_F (12.78_C).
A08180
Fig. 4 – System Operating Enevelope
ELECTRICAL DATA
OPERATING
MAX
FUSE/CB
AMP
COMPRESSOR
OUTDOOR FAN
INDOOR FAN
UNIT
SIZE
VOLTAGE*
MCA
MAX/MIN
V O LT S --- P H --- H Z
RLA
7.5
9.9
5.2
7.3
9.7
LRA
40
FLA
HP
W
VOLTS
35 DC
35 DC
FLA
1.1
HP
W
20
25
25
31
50
009
012
012
018
024
0.034
0.044
0.044
0.075
0.112
12
15
9
20
25
15
20
25
127/104
253/187
115 --- 1 --- 60
0.60
0.102
23
47
1.18
1.18
0.26
21
0.38
0.78
0.62
0.116
0.224
0.218
36
53
32.6
34.8
11
14
208/230---1---60
208/230---1---60
100
0.39
*Permissible limits of the voltage range at which the unit will operate satisfactorily
LEGEND
FLA--- Fu l l L oad Amps
LRA --- L ocked Rotor Amps
MCA --- Minimum Circuit Amps
RLA --- Rated Load Amps
8
WIRING
The main power is supplied to the outdoor unit. The field supplied connecting cable from the outdoor unit to indoor unit consists of four
wires and provides the power for the indoor unit as well as the communication signal between the outdoor unit and indoor unit.
Voltage drop on the connecting cable should be kept to a minimum. Use cable size and max length below:
18 AWG
16 AWG
50 ft. (16 m)
100 ft. (33 m)
CONNECTION DIAGRAMS
CONNECTING CABLE
CONTROL
CONTROL
CONNECTING CABLE
CONNECTING CABLE
Notes:
1. Do not use thermostat wire for any connection between indoor and outdoor units.
2. All connections between indoor and outdoor units must be as shown. The connections are sensitive to polarity.
3. On the 18k and 24k units, the “S” terminal “CONTROL” output is pulse DC with a potential AC voltage shock hazard.
A07654
Fig. 5 – Connection Diagrams
9
10
11
12
13
14
15
16
REFRIGERATION CYCLE DIAGRAM
FIELD
PIPING
FLARE CONNECTION
TWO PHASE
LIQUID LINE
CAPILLARY TUBE
SERVICE VALVE
HEAT
EXCHANGER
(CONDENSER)
HEAT
EXCHANGER
(EVAPORATOR)
SERVICE VALVE W/GUAGE PORT
SUCTION LINE
FLARE CONNECTION
COMPRESSOR
FIELD
PIPING
A08104
Fig. 13 – Cooling
INDOOR UNIT
OUTDOOR UNIT
CHECK VALVE
FLARE CONNECTION
TWO PHASE
(HEATING MODEL ONLY)
LIQUID
LIQUID HTG
CAPILLARY TUBE
SERVICE VALVE
HEAT
HEAT
EXCHANGER
EXCHANGER
(CONDENSER)
(EVAPORATOR)
SERVICE VALVE
W/ GUAGE PORT
SUCTION
DISCHARGE
REVERSING
SUCTION
ACCUMULATOR
VALVE
FLARE CONNECTION
(HEAT PUMP ONLY)
COOLING
HEATING
COMPRESSOR
FIELD
PIPING
A08105
Fig. 14 – Heat Pumps
17
Long Line Applications, 38MVC Units:
REFRIGERANT LINES
1. A crankcase heater should be added for line lengths longer
than 25 ft (7.62 m) to prevent the migration of refrigerant to
the compressor during the “OFF” cycle.
General refrigerant line sizing:
1. The 38MVC/MVQ units are shipped with a full charge of
R410A refrigerant. All charges, line sizing, and capacities
are based on runs of 25 ft (7.6 m). For runs over 25 ft (7.6
m), consult long--line section on this page for proper charge
adjustments.
2. A field fabricated wind baffle is recommended.
3. No change in line sizing is required.
4. Add refrigerant per table below.
2. Minimum refrigerant line length between the indoor and
outdoor units is 10 ft. (3 m).
3. Refrigerant lines should not be buried in the ground. If it is
necessary to bury the lines, not more than 36--in (914 mm)
should be buried. Provide a minimum 6--in (152 mm)
vertical rise to the service valves to prevent refrigerant
migration.
4. Both lines must be insulated. Use a minimum of 1/2--in.
(12.7 mm) thick insulation. Closed--cell insulation is
recommended in all long--line applications.
5. Special consideration should be given to isolating
interconnecting tubing from the building structure. Isolate
the tubing so that vibration or noise is not transmitted into
the structure.
ADDITIONAL CHARGE TABLE
Total
Line Length,
ft
Additional Charge, oz.
Unit
Size
10 --- 25 ft
(3.05 --- 7.62m)
> 2 5 --- 6 5 ft
(7.62---19.81m)
> 6 5 --- 1 0 0 ft
Min.
Max.
(19.81---30.48m)
9K
cool
only
9K
hp
65
12K
cool
only
12K
hp
0.1 oz per
foot
10
none
18K
cool
only
0.1 oz. per
foot
100
S
The following maximum lengths are allowed:
REFRIGERANT LINE LENGTHS ft. (m)
Max Line
Length
Max Elevation
(ID over OD)
Max Elevation
(OD over ID)
Unit Size
5. Reduction in capacity due to long lines can be calculated
from the chart below.
9K
65 (20)
65 (20)
35 (11)
35 (11)
50 (15)
60 (18)
35 (11)
35 (11)
50 (15)
60 (18)
12K
18K
24K
100 (30)
CAPACITY LOSS
Capacity, % Loss
Line Length, ft
100 (30)
S
The following are the piping sizes.
PIPE SIZES
Cooling:
25
0%
0%
45
2%
2%
65
5%
4%
100
Unit Size
9K
Mix Phase
1/4”
Vapor
3/8”
1/2”
1/2”
5/8”
9 & 12 KBTU/H models
18 & 24 KBTU/H models
Heating:
7%
12K
1/4”
18K
24K
1/4”
3/8”
9 & 12 KBTU/H models
18 & 24 KBTU/H models
0%
0%
7%
7%
11%
11%
Refrigerant Charge
15%
REFRIGERANT CHARGE lb. (kg)
Unit Size
Air Conditioner
Heat Pump
9K
2.3 (1.0)
2.9 (1.3)
4.4 (2.0)
TBD
2.4 (1.1)
3.0 (1.4)
TBD
12K
18K
24K
TBD
S
S
Above charge is for piping runs up to 25 ft. (7.6 m).
For piping runs greater than 25 ft. (7.6 m), add 0.1 oz. of
refrigerant per foot of extra piping up to the allowable
length.
18
Deep Vacuum Method
SYSTEM EVACUATION AND
CHARGING
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water. (See Fig. 17)
!
CAUTION
5000
4500
4000
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
LEAK IN
3500
SYSTEM
Never use the system compressor as a vacuum pump.
3000
2500
2000
1500
1000
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used if the procedure outlined
below is followed. Always break a vacuum with dry nitrogen.
VACUUM TIGHT
TOO WET
TIGHT
SYSTEM VACUUM AND CHARGE
500
DRY SYSTEM
Using Vacuum Pump
0
1
2
3
4
5
6
7
1. Completely tighten flare nuts A, B, C, D, connect manifold
gage charge hose to a charge port of the low side service
valve. (See Fig. 15.)
2. Connect charge hose to vacuum pump.
3. Fully open the low side of manifold gage. (See Fig. 16)
4. Start vacuum pump
5. Evacuate using either deep vacuum or triple evacuation
method.
6. After evacuation is complete, fully close the low side of
manifold gage and stop operation of vacuum pump.
MINUTES
Fig. 17 – Deep Vacuum Graph
Triple Evacuation Method
A95424
The triple evacuation method should only be used when vacuum
pump is only capable of pumping down to 28 in. of mercury
vacuum and system does not contain any liquid water.
Refer to Fig. 18 and proceed as follows:
1. Pump system down to 28 in. of mercury and allow pump to
continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
7. The factory charge contained in the outdoor unit is good for
up to 25 ft. (8 m) of line length. For refrigerant lines longer
than 25 ft (8 m), add 0.1 oz. per foot of extra piping up to
the maximum allowable length.
3. Connect a nitrogen cylinder and regulator to system and
open until system pressure is 2 psig.
8. Disconnect charge hose from charge connection of the low
side service valve.
9. Fully open service valves B and A.
4. Close service valve and allow system to stand for 1 hr. Dur-
ing this time, dry nitrogen will be able to diffuse throughout
the system absorbing moisture.
10. Securely tighten caps of service valves.
5. Repeat this procedure as indicated in Fig. 18. System will
then be free of any contaminants and water vapor.
Indoor Unit
C
Refrigerant
Low Side
Outdoor Unit
EVACUATE
A
B
D
BREAK VACUUM WITH DRY NITROGEN
WAIT
High Side
Service Valve
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
A07360
Fig. 15 – Service Valve
Manifold Gage
EVACUATE
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
500 microns
Low side valve
Charge hose
High side valve
Charge hose
Vacuum pump
RELEASE CHARGE INTO SYSTEM
A95425
Fig. 18 – Triple Evacuation Method
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both
indoor and outdoor unit has not shifted during shipment.
Ensure tubes are not rubbing against each other or any sheet
metal. Pay close attention to feeder tubes, making sure wire ties
on feeder tubes are secure and tight.
Low side valve
A07361
Fig. 16 – Manifold
19
CONTROL SYSTEM
The 40MVC/MVQ unit is equipped with a microprocessor control to perform two functions:
1. Provide safety for the system
2. Control the system and provide optimum levels of comfort and efficiency
The main microprocessor is located on the control board of the fan coil unit (outdoor units have a microprocessor too) with thermistors
located in the fan coil air inlet and on the indoor coil. Heat pump units have a thermistor on the outdoor coil. These thermistors monitor the
system operation to maintain the unit within acceptable parameters and control the operating mode.
SYSTEM SAFETIES
Cooling Only
Heat Pump
018K
Safety
9K
X
X
012K
018K
024K
09K
X
X
X
X
012K
024K
3 Min Time Delay
Over Current Protection On Compressor
Indoor Coil Freeze Protection
Condenser High Temperature Protection
Indoor Evaporator High Temperature
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
3 MINUTE TIME DELAY
In order to protect the compressor, there is a 3 minute delay on break even if the control is calling for heating or cooling.
COMPRESSOR OVERCURRENT PROTECTION
Overcurrent protection can result due to any of the following:
S
S
S
S
The ambient temperature is to high
Locked rotor on the compressor
Blockage in refrigeration circuit (cap tubes, for example)
Outdoor air is blocked or restricted
The compressor current is monitored continuously and protection is provided as shown below:
3 sec
5 min
Current down
Compressor off
(after 3 seconds)
Compressor off
(after 5 minutes)
Current up
1 sec
Outdoor fan
off (heating)
Indoor fan low
speed (cooling)
Normal
Indoor fan: On
compressor: On
outdoor fan: On
A08117
Fig. 19 – Compressor Overcurrent Protection
If the compressor is stopped 4 times at the 5 minute limit or 1 time at the 3 second limit, the system will be locked off and the main power will
have to be reset before the system can be restarted.
Compressor Current
Time Limit
38MVC(Q)009---1
38MVC(Q)012---1
38MVC(Q)012---3
38MVC(Q)018---3
38MVC(Q)024---3
3 SEC
5 MIN
I SEC
14 A
12 A
10.5 A
9 A
18 A
16A
14 A
12.5 A
11 A
9 A
7 A
6 A
14 A
12 A
11 A
10 A
23 A
21 A
18 A
16 A
NORMAL
20
Indoor Coil Freeze Protection
Indoor High Temperature Protection
The indoor coil can freeze due to any of the following:
High indoor coil temperature (in heating mode) can occur due to
any of the following:
S
S
S
S
S
Low system charge
S
S
S
High outdoor ambient temperature
Indoor fan blocked
Indoor coil blocked (including dirty filters)
Reduced indoor airflow
Restricted refrigerant flow
Low ambient temperature (outdoor)
Low load (indoor)
The indoor coil thermistor on a heat pump unit continuously
monitors the temperature of the indoor coil during heating
operation. Anytime the coil temperate exceeds the TE8 limit, the
outdoor fan is switched off. If the coil temperature continues to
climb and exceeds the TE7 limit, the compressor is switched off.
When the coil temperature drops below the TE9 limit, the
compressor and outdoor fan are switched back on as shown
below:
In cooling mode, the thermistor located on a return bend of the
indoor coil monitors the coil temperature continuously. Any time
the coil temperature drops below the TE5 limit for five consecutive
minutes, the compressor and outdoor fan will be switched off until
the coil temperature rises above the TE6 as shown below:
Compressor and
outdorr fan on
Compressor off
EVAP temp. down
EVAP temp. up
Fan off
Compressor on
Fan off
Compressor and outdoor
fan off (after 5 mins)
T temp. down
T temp. up
T
TE5
TE6
(Evap Temp.)
Compressor on
Fan on
A08118
TE9 TE8
TE7
T
Fig. 20 – Indoor Coil Freeze Protection
Coil Temperature ˚F (˚C)
A08120
Parameter
40MVC(Q)
009---1
39 (4)
40MVC(Q)
012---1
40MVC(Q)
018---3
40MVC(Q)
024---3
36 (2)
Fig. 22 – Indoor High Temperature Protection
Condenser Coil Temp.
TE5
TE6
41 (5)
36 (2)
˚F (˚C)
50 (10)
54 (12)
54 (12)
54 (12)
Parameter
40MVQ
009---1
40MVQ
012---1
40MVQ
018---3
40MVQ
Condenser High Temperature Protection
024---3
145 (63)
129 (54)
122 (50)
TE7
TE8
TE9
140 (60)
129 (54)
118 (48)
140 (60)
129 (54)
118 (48)
145 (63)
129 (54)
122 (50)
Condenser high temperature can occur due to any of the following
conditions:
S
S
S
High outdoor ambient
Outdoor fan blocked
Outdoor coil blocked
SEQUENCE OF OPERATION
Interface
The outdoor coil thermistor on a heat pump unit continuously
monitors the temperature of the outdoor coil. Anytime the coil
temperature exceeds the TE10 limit, the compressor is switched off
and the outdoor fan continues running to reduce the coil
temperature. When the coil temperature drops below the TE11
limit, the compressor is switched back on as shown below:
A wireless remote control, supplied with the unit, is the interface
between the fan coil and the user. The wireless remote control has
the following characteristics:
S
Capable of displaying _C and _F with _C being the default
setting. To change the default setting, refer to the Owner’s
Manual or push the recessed F/C button once using a paper
clip or similar object*.
The remote control setpoint range is from 62_F (17_C) to
88_F (30_C) in increments of 2_F (1_C).
There is a dedicated cooling only and heat pump remote
control.
The wireless remote control has an operating range of 25 ft.
(7.62 m).
The same remote control can be used to control more than one
unit.
If the remote control is lost, damaged, or the batteries are
exhausted, the system can be operated by using the manual
button (forced Auto) located under the front panel.
Compressor off
Outdoor fan on
COND temp. down
COND temp. up
S
S
S
S
S
Compressor on
Outdoor fan on
TE11
TE10
T
A08119
Fig. 21 – Condenser High Temp Protection
Condenser Temp.
˚F (˚C)
Parameter
38MVQ018---3
149 (63)
38MVQ024---3
TE10
TE11
158 (70)
149 (65)
131 (55)
Manual button
A07364
Fig. 23 – Manual Button Location on Unit
* On units produced during week 12 (2008) and later. Units
produced before week 12 have dedicated _C or _F controls.
21
Sleep Mode
MODES OF OPERATION
When in cooling mode, additional energy savings can be realized
by selecting the Sleep setting. When the Sleep setting is selected,
the temperature set point is adjusted automatically as shown below:
The units have 5 main operating modes:
1. Fan Only
2. Cooling
Set point
3. Heating (heat pumps only)
4. Auto
1.8
°F
5. Dehumidification (Dry)
1.8
°F
The units have 2 other modes (manual operation) that are operated
in unique situations:
1. Auto Forced Mode (Emergency)
2. Test Mode
1
2
Time (hour)
A08108
Fan Mode Only
Fig. 26 – Sleep Mode
In this mode, the system circulates the room air without changing
the room air temperature.
The unit will shut off 7 hours after the Sleep Mode is selected.
Turbo Mode
Cooling Mode
When in cooling mode, selecting Turbo will allow the indoor unit
to satisfy the temperature set point as quickly as possible. In Turbo
Mode, the indoor fan will shift to high speed and either run
continuously for 20 minutes or until the user pushes the Turbo
button again, at which point the fan speed will return to the original
setting.
In this mode, the system cools and dries the room air with the fan
running continuously, either at a selected fan speed or Auto fan
speed. The fan runs even when the compressor cycles off. This
feature enhances room comfort and efficiency of the system.
When the unit is operating in cooling, two sub modes can also be
selected:
Heating Mode
1. Sleep Mode is an energy saving feature that changes the set
point automatically.
In this mode, the system heats the room air with the indoor fan
running at either the selected speed or on Auto. As in the cooling
mode, the indoor fan will run continuously unless interrupted by
the cold blow algorithm. This algorithm will not allow the fan to
run if the indoor coil temperature drops below a preset value.
2. Turbo Mode is a comfort feature on the 9k and 12k units
where the set point is reached quickly by having the fan run
on high speed regardless of the speed that has been selected.
Compressor and Outdoor Fan Operation
The sleep function can be selected while the unit is running in the
The compressor and outdoor fan motor cycle on and off based on
the conditions of the set point and the room temperature as shown
below. There is no minimum run time.
Heating Mode.
microprocessor.
Defrost is controlled by the on--board
Compressor and Fan Operation
Compressor and
outdoor fan on
The compressor and outdoor fan cycle on and off based on the
actual room temperature versus the set point as shown below.
When the compressor starts, it will run continuously for 7 minutes
even if the set point condition is satisfied.
Room temp. down
Room temp. up
Compressor off
fan off
The 4--way value is energized in heating and will stay energized for
2 minutes after the mode is changed into a non--heating mode.
T
= Room Temperature
0
1.8
°F
T-Ts
Ts = Set Point Temperature
Compressor on
outdoor fan off
A08106
Room temp. down
Room temp. up
Fig. 24 – Compressor and Outdoor Fan -- Cooling Mode
Indoor Fan Operation
Compressor off
outdoor fan on
When in cooling mode, the fan runs continuously either at the
chosen set speed , or in Auto mode, where the speed is determined
by the microprocessor based on the difference between the room
temperature and the temperature set point as shown below:
High fan
Ts
Ts+3.6*
Ts+5.4*
T
T
= Room Temperature
TS = Set Point Temperature
* For 9k & 12k Units Only. For 18k and 24k units, numbers will be 5.4 and 7.2 respectively.
A08109
Fig. 27 – Compressor and Outdoor Fan -- Heating Mode
Med fan
Room temp. down
Room temp. up
Low fan
1.8 °F
7.2 °F
9.0 °F
T-Ts
T= Room Temperature
Ts = Set Point Temperature
A08107
Fig. 25 – Auto Fan -- Cooling Mode
22
Auto Fan
Defrost
When the fan speed is set to Auto, the fan will run at either the
medium or low speed based on the difference between the room
temperature and the set point temperature as shown below:
Defrost on heat pump units is controlled by the microprocessor and
is initiated if either of the following conditions occur:
1. The outdoor coil temperature is lower than 32_F (0_C) for
more than 40 minutes and during that period, the coil
temperature is continuously lower than 26.6_F (--3_C) for 3
minutes.
2. If the first condition does not occur within 90 minutes of
termination of the last defrost cycle.
Low. Speed
Room temp. down
Room temp. up
Med. Speed
The defrost cycle will terminate 10 minutes after initiation or when
the coil temperature reaches 68_F (20_C). At the end of the
Defrost cycle the timer resets automatically.
T-Ts
0
3.6°F
T
= Room Temperature
Ts = Set Point Temperature
The cycles of defrost algorithm are shown below:
A08112
Defrost 10 or 6 minutes
Fig. 28 – Auto Fan -- Heating Mode
Manual Indoor Fan
On
Compressor
4-way valve
Outdoor fan
Indoor fan
25s
Off
The indoor fan will run continuously in heating at the set fan speed
(even if the compressor cycles off) unless the indoor coil
temperature begins to drop. When the coil temperature drops to
the TE3 limit, the 18k and 24k unit indoor fan switches to low
speed. On the 9k and 12k unit the indoor fan switches to ultra low
speed. When the coil temperature drops to the TE4 limit, the
indoor fan on all systems shuts off to prevent cold blow as shown
below. The cold blow algorithm also applies to the auto fan
setting.
5s
2s
10s
Set fan speed
A08114
Low Speed /
Ultra Low Speed
Fig. 31 – Defrost Cycle
Auto Mode
T temp. down
T temp. up
(Coil temp.)
When the Auto setting is selected, the microprocessor looks at the
difference between the room temperature (T) and the set point
(TS). The algorithm determines which mode the unit will run in as
shown below:
Fan off
TE4 TE1
TE3 TE2
T
A08111
Heating (fan only in cooling)
Fan only
Cooling
Fig. 29 – Manual Indoor Fan -- Heating Mode
Indoor Coil Temperature ˚F (˚C)
Parameter
40MVQ
009---1
40MVQ
012---1
40MVQ
018---3
40MVQ
-1.8
°
F
3.6°F
T-TS
024---3
82 (28)
93 (34)
90 (32)
75 (24)
TE1
TE2
TE3
TE4
88 (31)
93 (34)
86 (30)
72 (22)
88 (31)
91 (33)
81 (27)
68 (20)
77 (25)
90 (32)
86 (30)
68 (20)
A08115
Fig. 32 – Auto Mode
When the unit shifts modes, it will remain in that mode for at least
15 minutes while the algorithm ignores the difference between T
and TS. This ensures that the unit cannot change modes too
frequently.
Sleep Mode
When in heating mode additional energy savings can be realized
by selecting the Sleep setting. When the Sleep setting is selected,
the temperature set point is adjusted automatically as shown below:
Set Point
1.8ºF
1.8ºF
1
2
Time (hour)
A08110
Fig. 30 – Sleep Mode -- Heating
The unit will shut off 7 hours after the Sleep mode is selected.
23
Dry (Dehumidification) Mode
Forced Auto (Emergency Operation)
When more humidity control is desired, the Dry setting can be
selected. Lower humidity is achieved when the microprocessor
adjusts the indoor fan speed and compressor cycling by comparing
the room temperature (T) and the set point temperature (TS).
Forced Auto option allows operation of the unit if the remote
control is lost or the batteries have expired. When the system is in
Forced Auto, it will run with a default set point of 75.2_F. While
in Forced Auto, the system will respond to signals from the remote
control.
There are two different control algorithms:
Size 9k and 12 k units:
Forced Cooling Operation
This option is used for diagnostic purposes. The system is forced
to run in cooling for 30 minutes.
T = TS + 3.6 -- the compressor will run for 6 minutes and the
indoor fan will run at low speed. The compressor will be off for 4
minutes and the indoor fan will run in ultra low speed.
After 30 minutes, the 9k and 12k systems will switch to Dry mode
with a default set point of 75.2_F. The 18k and 24k systems will
switch to Forced Auto mode. When the system is in Forced
Cooling mode, it will not respond to signals from the remote
control. The only way to exit the Forced Cooling mode is to push
the manual button once to switch the system to remote control
mode.
TS = T < TS + 3.6 -- The compressor will run for 5 minutes and the
indoor fan will run at low speed. The compressor will be off for 5
minutes and the indoor fan will run in ultra low speed.
T < TS -- The compressor will run for 4 minutes and the indoor
fan will run at low speed. The compressor will be off for 6 minutes
and the indoor fan will run in ultra low speed.
Size 18k and 24k units:
These units do not have ultra low speed. When set for
dehumidification, the indoor fan runs at low speed and the
compressor cycles based on the difference between T and TS.
Manual Operation
The unit can be set for Forced Auto or Forced Cooling manually
by pushing the Manual button once or twice as shown below:
Push Once
Push Twice
Push 3 Times
Remote
mode
Forced
auto
Forced
cooling
A08116
Fig. 33 – Manual Operation
24
TROUBLESHOOTING
This section provides the required flow charts to troubleshoot problems that may arise.
NOTE: Information required in the diagnoses can be found either on the wiring diagrams or in the appendix.
Required Tools:
The following tools are needed when diagnosing the units:
S
S
S
Digital multimeter
Screw drivers (Phillips and straight head)
Needle--nose pliers
Recommended Steps
1. Refer to the diagnostic hierarchy chart below and determine the problem at hand.
2. Go to the chart listed in the diagnostic hierarchy and follow the steps in the chart for the selected problem.
DIAGNOSTIC HIERARCHY
Unit has a problem
Unit displays a
diagnostic code
Unit not running and
no diagnostic code
Unit running but not
optimally
Refer to page -A--8 & A9
Go to chart # 7
Go to chart # 8 & 9
and use
identify error code*
appropriate diagnostic chart
* For EEROM error, replace the indoor microprocessor board
A08165
For the ease of service, the systems are equipped with diagnostic
code display LED’s on both the indoor and outdoor units. The
outdoor diagnostic display is an LED on the outdoor unit board
and is limited to very few errors. However, it is useful in
identifying special error codes like a failure of the outdoor coil
sensor on heat pumps. The indoor diagnostic display is a
combination of flashing LED’s on the display panel on the front of
the unit. If possible always check the diagnostic codes displayed on
the indoor unit first.
For problems requiring measurements at the control boards please
note the following:
1. Always disconnect the main power.
2. When possible check the outdoor board first.
3. Start by removing the outdoor unit top cover.
4. Reconnect the main power
5. Probe the outdoor board inputs and outputs with a digital
multi--meter referring to the wiring diagrams and
input/output charts found in the appendix.
6. Connect the red probe to hot signal and the black probe to
the ground or negative.
7. Note that some of the DC voltage signals are pulse will give
continuously variable readings.
The diagnostic codes for the indoor and outdoor units are listed in
appendix A8 and A9.
Problems may occur that are not covered by a diagnostic code, but
are covered by the diagnostic flow charts starting with the
diagnostic hierarchy. These problems will be typical air
conditioning mechanical or electrical issues that can be corrected
using standard air conditioning repair techniques.
8. If it is necessary to check the indoor unit board you must
start by disconnecting the main power.
9. Next remove the front cover of the unit and then control
box cover.
10. Carefully remove the indoor board from the control box,
place it face up on a plastic surface (not metal).
11. Reconnect the main power and repeat steps 5,6, and 7.
12. Disconnect main power before reinstalling board to avoid
shock hazard and board damage.
25
CHART 1 -- INDOOR FAN SPEED OUT OF CONTROL
Reset main power and
restart system using remote.
Problem persists?
No
No
No further action is
required
Yes
Check motor connection.
Connection good?
Fix connection
Yes
Check IFM output and input No
on indoor board.
Values good?
Replace indoor board
Yes
Replace indoor fan motor
A08166
26
CHART 2 -- TEMPERATURE SENSOR
Reset main power and
restart system using remote.
Problem persists?
No
No
No further action is
required
Yes
Check sensor connector
at ID or OD board
Connection good?
Fix connection
Replace board
Yes
No
No
Check input and output
on indoor or outdoor board.
Yes
Check sensor resistance.
Appendix 6
Replace sensor
Yes
Double check connection,
for corrosion or high
resistance.
A08167
27
CHART 3 -- COMPRESSOR OVERCURRENT PROTECTION
Is unit running in outdoor
ambient higher than
Beyond operating range
125 °F?
No
No
No
No
Clean coil.
Problem persists?
Outdoor coil clean?
Yes
Problem solved
Problem solved
Yes
Check connections from Yes
OD board. Corrosion, or
high resistance
Clean/repair connection
Problem persists?
Yes
No
No
Outdoor fan Ok?
Change outdoor motor
Yes
No
No
Connect gauges to unit.
pressures ok?
High head, high suction?
Yes
High head, low suction?
Yes
Yes
Check amp draw to
compressor? Values within
range?
Unit is overcharged.
Reclaim charge and weigh
in correct charge.
No
Restriction in refrigeration
circuit.
Replace compressor
Yes
Replace outdoor board
A08168
28
CHART 4 -- INDOOR UNIT COMMUNICATION ERROR SIZE 9K AND 12K
Notes:
Check the wires and
connections between
Indoor and outdoor units*
No
No
Fix connection or
replace wiring
Before measuring the Volts DC on outdoor TB,
disconnect the field wire on terminal 1.
Yes
Before measuring the Volts DC on Indoor TB,
disconnect the field wire on terminal 1.
Reset main power and
restart system using remote.
Problem persists?
No further action is
required
Have the red probe of the meter on terminal 1
and the black probe on terminal 3. Reconnect
wiring when measurements are complete.
Yes
Measure Volts DC on
outdoor TB between 1 & 3.
Ok?**
Measure Volts DC on
indoor TB between 1 & 3.
Ok?**
Yes
Recheck wiring and
connections
No
No
.
Replace outdoor board.
Replace indoor board.
*
Make sure wires are connected per connection diagrams. Failing to do that will result in a communication error.
** There is a 2 to 3 minute window to take the measurement before the diagnostic light is on again.
A08181
29
CHART 5 -- OUTDOOR UNIT PROTECTS
No
Clean coil. Problem
persists?
No
Outdoor coil clean?
Yes
Problem solved
Yes
Check outdoor unit
board. Indicator light
flashing twice?
Yes
Check sensors.
Flow Chart #2
No
Connect gauges to
unit. Pressures ok?
Yes
No
Check application
limits
No
No
No
Normal suction,
high head?
High head, high
suction?
High head, low
suction?
Suction and head
equal?
Yes
Yes
Yes
Yes
Non condensables
in sys. Pump down
and recharge unit
Unit is overcharged.
Reclaim charge and
weigh in correct charge
*
Check compressor
See note below
* Restriction in system. Check capillary tube, check for moisture, and check for damage to liquid line between indoor and
outdoor units.
A08182
30
CHART 6 -- INDOOR UNIT COMMUNICATION ERROR SIZE 18K AND 24K
Check the wires and
connections between
Indoor and outdoor units*
No
No
Notes:
Fix connection or
replace wiring
When unit is operating normally and a DC
voltage reading is taken between the S and
G terminal on the outdoor unit (or indoor
unit) positive and negative readings will
fluctuate between 0 and 24V DC.
Yes
Reset main power and
restart system using remote.
Problem persists?
No further action is
required
If indoor board is bad, only a positive
readings will be registered between
terminals S and G on the outdoor unit. The
reverse will apply if outdoor board is bad
(only negative readings will register).
Yes
Measure VDC reading on
outdoor between S and G.
Reading positive? **
No
Replace outdoor board
Above data is obtained by having the red
probe of the meter on the S terminal and
the black probe on the G terminal.
Yes
.
Replace indoor board.
* Make sure wires are connected per connection diagrams i.e. L1 to L1 and L2 to L2. Failing to do that will result in a
communication error.
** There is a 2 to 3 minute window to take measurements before the diagnostic light is on again.
A08183
31
CHART 7 -- UNIT NOT RUNNING, NO DIAGNOSTIC CODE
Use auto forced function.
Unit runs?
No
Yes
Reset remote and restart
the unit. Is unit running?
No
No
Check batteries. OK?
Yes
Replace battery
Yes
Problem solved
Go to chart #13
Check wiring and circuit
breaker and fix
Reset circuit breaker. Is unit
running?
No
No
No
Is there power to outdoor
unit?
Yes
Yes
Check fuse on outdoor
board. Ok?
Problem solved
Replace fuse
Yes
Check input and output on
outdoor board. Ok?
No
Replace outdoor board
Replace indoor board
No
Yes
Yes
Check components. Ok?
Flow charts 10 thru 12
Check fuse(s) on indoor
board. Ok?*
Check input and output on
indoor board. Ok?
Yes
No
No
Determine defective
component and replace
Replace defective
component
Replace fuse
* For sizes 18 and 24 K units only. For sizes 9 and 12K units proceed to check inputs and outputs on indoor boards.
A08169
32
CHART 8 -- UNIT NOT RUNNING OPTIMALLY
No
Clean coil. Problem
persists?
No
Outdoor coil clean?
Problem solved
Problem solved
Yes
Yes
No Clean filter. Problem No
persists?
Indoor filter clean?
Yes
Yes
Check indoor fan
motor
No
Replace indoor fan
motor.
Yes
Connect gauges to Yes
unit. Pressures ok?
Check application
limits.
No
No
No
No
Normal suction,
high head?
High head, high
suction?
High head, low
suction?
Suction and head
equal?
Yes
Yes
Yes
Yes
Non condensables
in sys. Pump down
and recharge unit
Unit is overcharged.
Reclaim charge and
weigh in correct charge
Check compressor
See note below*
* Restriction in system. Check capillary tube, check for moisture, and check for damage to liquid line between indoor and
outdoor units.
A08170
33
CHART 9 -- UNIT NOT RUNNING OPTIMALLY (HP IN HEATING)*
No
No
Check reversing valve.
Go to flow chart #12
Visually check outdoor
Unit for ice blockage. **
Yes
Check defrost sensor. Ok?
Go to flow chart #2
Replace sensor
Yes
No
Check application limits.
Ok?
Beyond operating range
Yes
Check ambient conditions.
Prime icing?
Yes
Explain to customer
* To supplement flow chart #8
** Check for blockage on outdoor coil and drain pan. Are the holes in drain pans blocked?
A08184
34
CHART 10 -- COMPRESSOR
Trace connections from
OD board. Connections
ok?
No
No fix connection
Replace contactor
Replace capacitor
Replace compressor
Yes
No
Check contactor.*
Contactor ok?
Yes
No
No
Check capacitor.
Capacitor ok?
Yes
Check compressor
windings. Ok?
No
Compressor ok.
* For size 9 and 12k units contactor is on outdoor board.
Check contactor output on outdoor board if not done already.
If bad, replace outdoor board.
A08171
35
CHART 11 -- OUTDOOR MOTOR
Visually confirm that fan
blades and outdoor coil
are not blocked.
No
Clear blockage
Fix connection
Yes
Trace connections from
OD board. Connections
ok?
No
Yes
Check capacitor.
Capacitor ok?
No
Replace capacitors
Yes
No
Check motor windings.
Ok?
Replace motor
Yes
Motor ok.
A08172
36
CHART 12 -- REVERSING VALVE
No
Clean or repair the
connection
Check RV connection on
outdoor board. Ok?
Yes
No
Check RV output on outdoor
board. Ok?
Replace outdoor board
Yes
No
Check RV solenoid. Ok?
Replace solenoid
Yes
Replace reversing valve.
CHART 13 -- RECEIVER BOARD
Check wiring and
connection between
receiver and ID board. Ok?
No
Fix wiring or
connection
Yes
Check input and output
on ID and receiver
boards. Ok?
No
Replace receiver board
Yes
Replace remote control
A08173
37
APPENDIX
APPENDIX TABLE OF CONTENTS
DESCRIPTION
NUMBER
Control Boards Input/Output tables for 53MVC009(12)------1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1
Control Boards Input/Output tables for 53MVQ009(12)------1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2
Control Boards Input/Output tables for 53MVC012------3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A3
Control Boards Input/Output tables for 53MVQ012------3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A4
Control Boards Input/Output tables for 53MVC018------3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A5
Temperature Sensor Values (Temperature vs. Resistance) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A6
Fuse Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A7
Indoor Unit Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A8
Outdoor Unit Diagnostic Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A9
38
A 1 -- 5 3 M V C 0 0 9 -- -- -- 1 / 5 3 M V C 0 1 2 -- -- -- 1
3 8 M V C 0 0 9 --- --- --- 1 / 3 8 M V C 0 1 2 --- --- --- 1 C O N T R O L B O A R D
CONNECTOR
INPUT or OUTPUT VALUE
CN2
CN3
CN4
CN9
CN10
P1
OUT: (Pin 1: Pulse 0 to 12 Volts DC) (Pin2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Volts DC) all relative to Pin 3
OUT: Neutral
IN: Neutral
OUT: L 115 Volts AC
IN:
L 115 Volts AC
GND
GND
P2
4 0 M V C 0 0 9 --- --- --- 1 / 4 0 M V C 0 1 2 --- --- --- 1 C O N T R O L B O A R D
INPUT or OUTPUT VALUE
CONNECTOR
CN1
IN: 0 --- 5 Vo lt D C
IN: 0 --- 5 Vo lt D C
CN2
CN3
Pulse drive output: 0---17 Volts DC（Pin 5: GND All other Pins are 0 to 17 Volt DC) All relative to Pin 5）
Power Output: (Pin 1: GND) (Pin 2: 5 Volts DC) Input: (Pin 3: Pulse 0 to 5 Volts DC) Output:(Pin 4~ Pin 10: Pulse 0 to 5
Volt DC) All relative to Pin 1
CN5
Out: (Pin 1: 35 Volt DC) ( Pin 2: Empty) (Pin 3: GND) (Pin 4: 5 Volt DC) (Pin 5: Pulse 0---5 Volt DC) IN: (Pin 6: Pulse 0 to 5
Volt DC) All relative to Pin 3
CN6
G1
IN: (Pin 1: Pulse 0 to 12 Volts DC) (Pin2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Volts DC) all relative to Pin 3
A 2 -- 5 3 M V Q 0 0 9 -- -- -- 1 / 5 3 M V Q 0 1 2 -- -- -- 1
38MVQ009---1/38MVQ012--- --- ---1 CONTROL BOARD
CONNECTOR
CN1
INPUT or OUTPUT VALUE
OUT: (Pin 1: GND, Pin 2: 5 Volts DC, Pin 3: Empty) IN: (Pin 4: 0 to 5 Volts DC) All relative to Pin 1
OUT: (Pin 1: Pulse 0 to 12 Volts DC) (Pin2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Volts DC) all relative to Pin 3
OUT: Neutral
CN2
CN3
CN4
IN:
Neutral
CN5
OUT: L 115 Volt AC
OUT: L 115 Volt AC
CN6
CN10
P1
IN:
L 115 Volt AC
GND
GND
P2
40MVQ009---1/40MVQ012--- --- ---1 CONTROL BOARD
INPUT or OUTPUT VALUE
CONNECTOR
CN1
IN: 0 --- 5 Vo lt D C
IN: 0 --- 5 Vo lt D C
CN2
CN3
Pulse drive output: 0---17 Volts DC（Pin 5: GND All other Pins are 0 to 17 Volt DC) All relative to Pin 5）
Power Output: (Pin 1: GND) (Pin 2: 5 Volts DC) Input: (Pin 3: Pulse 0 to 5 Volts DC) Output:(Pin 4~ Pin 10: Pulse 0 to 5
Volt DC) All relative to Pin 1
CN5
Out: (Pin 1: 35 Volt DC) ( Pin 2: Empty) (Pin 3: GND) (Pin 4: 5 Volt DC) (Pin 5: Pulse 0---5 Volt DC) IN: (Pin 6: Pulse 0 to 5
Volt DC) All relative to Pin 3
CN6
G1
IN: (Pin 1: Pulse 0 to 12 Volts DC) (Pin2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Volts DC) all relative to Pin 3
39
A 3 -- 5 3 M V C 0 1 2 -- -- -- 3
3 8 M V C 0 1 2 --- --- --- 3 C O N T R O L B O A R D
INPUT or OUTPUT VALUE
CONNECTOR
CN2
CN3
CN4
CN9
CN10
P1
OUT: (Pin 1: Pulse 0 to 12 Volts DC) (Pin2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Volts DC) all relative to Pin 3
OUT: L2 208/230 Volt AC
IN:
OUT: L1 208/230 Volt AC
IN: L1 208/230 Volt AC
L2 208/230 Volt AC
Ground
Ground
P2
4 0 M V C 0 1 2 --- --- --- 3 C O N T R O L B O A R D
INPUT or OUTPUT VALUE
CONNECTOR
CN1
IN: 0 --- 5 Vo lt D C
IN: 0 --- 5 Vo lt D C
CN2
CN3
Pulse drive output: 0---17 Volts DC（Pin 5: GND All other Pins are 0 to 17 Volt DC) All relative to Pin 5)
Power Output: (Pin 1: GND) (Pin 2: 5 Volts DC) Input: (Pin 3: Pulse 0 to 5 Volts DC) Output:(Pin 4~ Pin 10: Pulse 0 to 5
Volt DC) All relative to Pin 1
CN5
Out: (Pin 1: 35 Volt DC) ( Pin 2: Empty) (Pin 3: GND) (Pin 4: 5 Volt DC) (Pin 5: Pulse 0---5 Volt DC) IN: (Pin 6: Pulse 0 to 5
Volt DC) All relative to Pin 3
CN6
G1
IN: (Pin 1: Pulse 0 to 12 Volts DC) (Pin2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Volts DC) all relative to Pin 3
A 4 -- 5 3 M V Q 0 1 2 -- -- -- 3
3 8 M V Q 0 1 2 --- --- --- 3 C O N T R O L B O A R D
INPUT or OUTPUT VALUE
CONNECTOR
CN1
CN2
CN3
CN4
CN5
CN6
CN10
P1
OUT: (Pin 1: GND, Pin 2: 5 Volts DC, Pin 3: Empty) IN: (Pin 4: 0 to 5 Volts DC) All relative to Pin 1
OUT: (Pin 1: Pulse 0 to 12 Volts DC) (Pin2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Volts DC) all relative to Pin 3
OUT: L2 208/230 Volt AC
IN:
L2 208/230 Volt AC
OUT: L1 208/230 Volt AC
OUT: L1 208/230 Volt AC
IN:
L1 208/230 Volt AC
Ground
Ground
P2
4 0 M V Q 0 1 2 --- --- --- 3 C O N T R O L B O A R D
INPUT or OUTPUT VALUE
CONNECTOR
CN1
IN: 0 --- 5 Vo lt D C
IN: 0 --- 5 Vo lt D C
CN2
CN3
Pulse drive output: 0---17 Volts DC（Pin 5: GND All other Pins are 0 to 17 Volt DC) All relative to Pin 5）
Power Output: (Pin 1: GND) (Pin 2: 5 Volts DC) Input: (Pin 3: Pulse 0 to 5 Volts DC) Output:(Pin 4~ Pin 10: Pulse 0 to 5
Volt DC) All relative to Pin 1
CN5
Out: (Pin 1: 35 Volt DC) ( Pin 2: Empty) (Pin 3: GND) (Pin 4: 5 Volt DC) (Pin 5: Pulse 0---5 Volt DC) IN: (Pin 6: Pulse 0 to 5
Volt DC) All relative to Pin 3
CN6
G1
IN: (Pin 1: Pulse 0 to 12 Volts DC) (Pin2: 35±2 Volts DC) (Pin 3: GND) (Pin 4: 13±4 Volts DC) all relative to Pin 3
40
A 5 -- 5 3 M V C 0 1 8 -- -- -- 3
3 8 M V C 0 1 8 --- --- --- 3 C O N T R O L B O A R D
INPUT or OUTPUT VALUE
CONNECTOR
CN1
CN3
CN4
CN5
CN6
CN8
IN: 14.5±5V Volts AC
Pulse Signal 0 to 24 Volts DC (Relative to ground)
IN:
IN:
L1 208/230 Volts AC
L2 208/230 Volts AC
OUT: 208/230 Volts AC
OUT: 208/230 Volts AC
4 0 M V C 0 1 8 --- --- --- 3 C O N T R O L B O A R D
INPUT or OUTPUT VALUE
CONNECTOR
CN1
IN: 11.0±3 Volts AC (Pin 1 to Pin2 );
OUT: IFM Capacitor Terminal 1
OUT: IFM Capacitor Terminal 2
OUT: 208/230 Volts AC
9.5±2 Volts AC (Pin 3 to Pin 4)
CN2
CN4
CN5
CN6
OUT: 208/230 Volts AC (Pin 1 to Pin 2, Pin 1 to Pin 3, Pin 1 to Pin4)
CN7
IN:
IN:
0---5 Volt DC (Not including 0V and 5V)
0---5 Volt DC (Not including 0V and 5V)
CN8
CN9
OUT: (Pin 1: Ground, Pin 2: 5 Volts DC) IN: (Pin 1: Ground, Pin 3: 0 to 5 Volts DC) Pulse relative to Pin 1
OUT: (Pin 1: Ground, Pin 2 ~ Pin 5: 0 to 5 Volts DC) Pulse relative to Pin 1
OUT: (Pin 5: Ground, all other Pins are 0 to 17 Volts DC) Pulse relative to Pin 5
Two way signal, 0 to 24 Volts DC, Pulse relative to Ground
CN10
CN11
CN12
P1
IN:
IN:
L1 208/230 Volts AC
L2 208/230 Volts AC
P2
INDOOR UNIT DISPLAY BOARD
INPUT or OUTPUT VALUE
CONNECTOR
CN1
IN: (Pin 1: Ground, Pin 2 ~ 5: 0 to 5 Volts DC) Pulse relative to Pin 1
IN: (Pin 1: Ground, Pin: 5 Volts DC) OUT: (Pin 3: 0 to 5 Volts DC) Pulse relative to Pin 1
CN2
41
A6 -- Characteristics of Temperature Sensor
Temp. ˚F/˚C
14/---10
15.8/---9
17.6/---80
19.4/---7
21.2/---6
23/---5
Resistance KΩ
62.2756
58.7079
56.3694
52.2438
49.3161
46.5725
44
Temp. ˚F/˚C
62.6/17
64.4/18
66.2/19
68/20
Resistance KΩ
14.6181
13.918
13.2631
12.6431
12.056
11.5
Temp. ˚F/˚C
111.2/44
113/45
Resistance KΩ
4.3874
4.2126
4.0459
3.8867
3.7348
3.5896
3.451
114.8/46
116.6/47
118.4/48
120.2/49
122/50
69.8/21
71.6/22
73.4/23
75.2/24
77/25
24.8/---4
26.6/---3
28.4/---2
30.2/---1
32/0
10.9731
10.4736
10
41.5878
39.8239
37.1988
35.2024
33.3269
31.5635
29.9058
28.3459
26.8778
25.4954
24.1932
22.5662
21.8094
20.7184
19.6891
18.7177
17.8005
16.9341
16.1156
15.3418
123.8/51
125.6/52
127.4/53
129.2/54
131/55
3.3185
3.1918
3.0707
2.959
78.8/26
80.6/27
82.4/28
84.2/29
86/30
9.5507
9.1245
8.7198
8.3357
7.9708
7.6241
7.2946
6.9814
6.6835
6.4002
6.1306
5.8736
5.6296
5.3969
5.1752
4.9639
4.7625
4.5705
33.8/1
2.8442
2.7382
2.6368
2.5397
2.4468
2.3577
2.2725
2.1907
2.1124
2.0373
1.9653
1.8963
1.83
35.6/2
132.8/56
134.6/57
136.4/58
138.2/59
140/60
37.4/3
39.2/4
87.8/31
89.6/32
91.4/33
93.2/34
95/35
41/5
42.8/6
44.6/7
141.8/61
143.6/62
145.4/63
147.2/64
149/65
46.4/8
48.2/9
96.8/36
98.6/37
100.4/38
102.2/39
104/40
50/10
51.8/11
53.6/12
55.4/13
57.2/14
59/15
150.8/66
152.6/67
154.4/68
156.2/69
158/70
105.8/41
107.6/42
109.4/43
1.7665
1.7055
1.6469
60.8/16
42
A7 -- Fuse Chart
Fuse Rating (Amps/Volts)
Outdoor
Unit Size
Indoor
Outdoor
2A/250V
2A/250V
---
009
012
018
024
---
3.15A/250V
---
3.15A/250V
3.15A/250V
3.15A/250V
3.15A/250V
3.15A/250V
---
The 3.15A fuses protect the board against the indoor or outdoor fan motors.
The 2A fuses protect the board against a Class II circuit board failure.
A8 -- Indoor Unit Diagnostic Guides
9K & 12K Units
Failure Mode
Operation
Lamp
Timer
Lamp
Diagnostic
Chart
l
X
On
l
Indoor fan speed has been out of control for over 1 minute
Indoor room temp. or evaporator sensor is open circuit or short circuited
Compressor over---current protection has been activated four times
EPROM error*
1
2
3
---
4
l
X
On
l
l
l
Indoor unit communication error (Illuminates simultaneously)
18K & 24K Units
Opera-
tion
Lamp
Timer
Lamp
Defrosting
Lamp
Auto
Lamp
Diagnostic
Chart
Failure Mode
l
l
l
X
l
X
X
l
X
X
Over---current protection of the compressor occurs four times
Indoor room temp. sensor is open circuit or short circuited
Temp. sensor on indoor evaporator is open circuit or short circuited
3
2
2
X
l
Temp. sensor on outdoor condenser is open circuit or short circuited (not
cooling only modes)
X
X
l
X
2
X
X
X
X
l
X
l
X
X
l
l
l
Outdoor unit protects (outdoor temp. sensor, phase order, etc.)
EPROM error*
Indoor unit communication error
5
---
6
l
= Flashing
= Off
X
* = Replace Indoor Board
Infrared signal receptor
Infrared signal receptor
OPERATION AUTO
TIMER
PRE.-DEF.
TIMER OPERATION
OPERATION AUTO
TIMER
PRE-DEF
A07546a
ECON
PRE-DEF
A07544
A07545a
Model size 012
Model size 009
Model size 018-024*
* PRE--DEF light will illuminate when the unit is running in FAN ONLY mode on Cooling Only units.
Fig. 34 – LED Display Panel
A9 -- Outdoor Unit Diagnostic Guides
Flashing
Times after 2
Second Off
Diagnostic
Chart
Failure Mode
5
2
1
Communication failure
Condenser temperature sensor failure
Other indoor failure
4 or 6
2
–
If the unit is operating normally, the LED light on the outdoor board is lit continuously. If there is a failure, the LED light will flash a specific
number of times. Refer to the Outdoor Unit Diagnostic table above to determine failure.
43
Copyright 2008 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Printed in U.S.A.
Edition Date: 03/08
Catalog No.38---40MV---1SM
Replaces: New
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
44
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