Carrier High Wall Duct Free Split System 38MVQ User Manual

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 “CONTROLoutput 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 DCPin 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 DCPin 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 DCPin 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 DCPin 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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