Service Manual
2003
Room Air Conditioners
RACServMn (7-03)
UNIT IDENTIFICATION
Model Number Code
S S 08 J 1 0 R
1st Digit – Function
8th Digit – Engineering
S = Straight Cool, Value Series
C = Straight Cool, Budget
Series
Major change
7th Digit – Options
Y = Heat Pump
0 = Straight Cool & Heat Pump Models
1 = 1 KW Heat Strip, Normal
3 = 3 KW Heat Strip, Normal
4 = 4 KW Heat Strip, Normal
5 = 5 KW Heat Strip, Normal
8 = 8 KW Heat Strip, Normal
E = Electric Heat
K = Straight Cool, Challenger
Series
W = Thru-the Wall,
WallMaster Series
6th Digit – Voltage
2nd Digit
1 = 115 Volts
C = Casement
P = PowerMiser "Portable"
Q = Q-Star
2 = 230 Volts
3 = 230-208 Volts
M = Medium Chassis
L = Large Chassis
W = Built -In
5th Digit
Alphabetical Modifier
H = HazardGard
3rd and 4th Digit -
Approximate BTU/HR
(Cooling)
Heating BTU/Hr capacity listed in
the Specification/Performance
Data Section
RAC Serial Number Identification Guide
Serial Number
Decade Manufactured
L
C
G
S
00001
L=0
A=1
B=2
C=3
D=4
E=5
F=6
G=7
H=8
J=9
Production Run Number
Year Manufactured
PRODUCT LINE
S=RAC
A=1
B=2
C=3
D=4
E=5
F=6
G=7
H=8
J=9
K=0
P=PTAC
E=EAC
V=VPAK
H=Split
Month Manufactured
A=Jan D=Apr G=Jul K=Oct
B=Feb E=May H=Aug L=Nov
C=Mar F=Jun J=Sep M=Dec
3
4
EQ PERFORMANCE DATA
OPERATING
PERFORMANCE
DATA*
EVAPORATOR AIR
TEMP. DEG. F.
ELECTRICAL
RATINGS
R-22
REFRIG. FUSE
BREAKER
PRESSURES
Cooling
Discharge Temp.
Suction
Discharge Amps
Locked
Charge in 60 Hertz
Air
Drop F.
29.5
Rotar Amp OZ.
Amps
15
EQ08J11-A
EQ08J11-B
50.5
50.5
72
74
262
259
7.5
7.5
39.2
39.2
20
20
29.5
15
XQ PERFORMANCE DATA
OPERATING
DATA*
Cooling
EVAPORATOR AIR
TEMP. DEG. F.
ELECTRICAL
RATINGS
Locked
R-22
REFRIG. FUSE
BREAKER
PRESSURES
Discharge Temp.
Suction
Discharge Amps
Charge in 60 Hertz
Air
Drop F.
24.55
28.55
28.55
27.95
29.5
Rotar Amp OZ.
Amps
15
XQ05J10B
XQ06J10-A
XQ06J10-B
XQ07J10-1
XQ08J10-1
XQ08J10-A
55.45
51.45
51.45
52.22
50.5
79
82
79
77
72
72
245
262
254
250
262
262
4.6
34
35
35
37
38
38
20
21
21
24
20
21
5.1
5.1
6.5
4.5
4.5
15
15
15
15
15
50.5
29.5
SQ PERFORMANCE DATA
PERFORMANCE EVAPORATOR AIR
OPERATING
PRESSURES
ELECTRICAL
RATINGS
R-22
REFRIG. FUSE
BREAKER
DATA*
TEMP. DEG. F.
Cooling
Discharge Temp.
Suction
Discharge Amps
Locked
Charge in 60 Hertz
Air
Drop F.
24.55
28.55
28.55
29.5
Rotar Amp OZ.
Amps
15
SQ05J10B-B
SQ06J10B-A
SQ06J10B-B
SQ08J10C-1
55.45
51.45
51.45
50.5
79
245 4.4
34.'0
35.'0
35.'0
39.2
16.'0
82
79
72
262
254
262
5.2
5.2
7.5
15.7
15.7
19.5
15
15
15
KQ-YQ PERFORMANCE DATA
PERFORMANCE
DATA*
EVAPORATOR AIR
TEMP. DEG. F.
OPERATING
PRESSURES
ELECTRICAL
RATINGS
R-22
REFRIG. FUSE
BREAKER
Cooling
Discharge Temp.
Suction
Discharge Amps
Locked
Charge in 60 Hertz
Air
Drop F.
28.66
28.66
28.66
21.98
21.98
21.98
21.98
25.9
Rotar Amp OZ.
Amps
15
KQ05J10B-B
KQ05E10-B
KQ05E10-C
KQ06J10B-A
KQ06J10B-B
KQ06E10-A
KQ06E10-B
YQ06J10B-A
56.34
56.34
56.34
58.02
58.02
58.02
58.02
54.1
73
251
245
245
262
269
262
254
267
5.2
5.2
5.2
5.8
5.8
5.8
5.8
5.7
29.'0
29.'0
29.'0
35.'0
35.'0
35.'0
35.'0
39.2
15.'0
79
79
82
80
82
79
81
15.'0
15.'0
15.'0
19.'0
15.'0
15.'0
19.'0
15
15
15
15
15
15
15
*Rating Conditions: 80 degree F. Room Air Temperature and 50% Relative Humidity with
95 degree F. Outside Air Temperature and 40% Relative Humitidy
5
RS-RM PERFORMANCE DATA
PERFORMANCE EVAPORATOR AIR
OPERATING
PRESSURES
ELECTRICAL
RATINGS
R-22
REFRIG.
BREAKER
FUSE
DATA*
TEMP. DEG. F.
Cooling
Discharge Temp.
Suction Discharge Amps
Locked Charge in 60 Hertz
Air
61
57
57
56.5
56
Drop F.
19
Rotar Amp
OZ.
26
30
29.5
30
48
Amps
15
15
15
15
RS10J10-C
RS12J10A-B
RS15J10-A
RS16J30A-A
RS18J30-A
RM24J30-A
82
83
77
77
72
68
248
271
279
296
293
301
7.5
9.8
11.1
7.2
8.7
12.2
44
54
42
42
42
44
23
23
24
24
15
15
57
23.65
54
YS-YM-YL PERFORMANCE DATA
PERFORMANCE EVAPORATOR AIR
OPERATING
PRESSURES
ELECTRICAL
RATINGS
R-22
REFRIG.
BREAKER
FUSE
DATA*
TEMP. DEG. F.
Cooling
Discharge Temp.
Suction Discharge Amps
Locked Charge in 60 Hertz
Air
59
56
53
55
Drop F.
21
Rotar Amp
OZ.
25
28
54
74
Amps
15
20
30
30
YS09J10B-A
YS12J33-A
YM18J34B-A
YL24J35C-A
90
80
74
72
243
264
284
260
7.7
39.2
30
42
24
27
25
5.2/5.6
8.7/9.2
10.0/12.0
61
* Rating Conditions: 80 degree F. Room Air Temperature and 50% Relative Humidity with
95 degree F. Outside Air Temperature at 40% Relative Humidity.
6
PERFORMANCE EVAPORATOR AIR
OPERATING
PRESSURES
ELECTRICAL
RATINGS
R-22
REFRIG.
BREAKER
FUSE
DATA*
TEMP. DEG. F.
Cooling
Discharge Temp.
Suction Discharge Amps
Locked Charge in 60 Hertz
Air
58
53
55
55
52
52
Drop F.
22
Rotar Amp
26.3
OZ.
28
30
40.5
48.5
60
Amps
20
20
30
30
ES12J33B-A
ES16J33A-A
EM18J34B-A
EL25J35-A
EL35J35-A
EL35J35-B
82
77
71
75
72
72
265
269
267
284
317
317
5.76.6
7.5/8.0
8.6/9.2
11.5/12.6
18/20
27
25
25
28
42.'0
42.'0
61.'0
94.'0
30
30
28
18/20
94.'0
60
PERFORMANCE Heat Rise
DATA heating
ES12J33B-A
ES16J33A-A
EM18J34B-A
EL25J35-A
EL35J35-A
EL35J35-B
30.5
30.5
28.3
28.6
22.9
22.9
16/14.7
16/14.7
19.5/17
24/22/4
24/22.4
24/22.4
KS-KM PERFORMANCE DATA
DATA*
Cooling
EVAPORATOR AIR
TEMP. DEG. F.
OPERATING
PRESSURES
ELECTRICAL
RATINGS
R-22
REFRIG.
BREAKER
FUSE
Discharge Temp
Amps
Locked Charge in 60 Herts
Air
61
61
57
57
55.78
57
56
55
55
Drop F.
19
Rotar Amp
48.3
OZ.
26.08
26.88
28
Amps
15
15
15
15
15
15
15
15
KS10E10-A
KS10J10-B
KS12E10-A
KS12J10B-A
KS15J10-A
KS12J30B-A
KS18J30-A
KM20J30-A
KM24J30-A
82
80
83
84
77
76
72
70
68
248
263
271
268
279
285
293
279
301
9.1
9.1
10.8
10.8
12.'0
6.2
8.7
9.9
15.'0
19
23
23
23.52
23
24
24
25
48.3
54.'0
54.'0
67.'0
26.'0
48
28
29.5
30.08
48
48
54.08
48
71.'0
15
* Rating Conditions: 80 degree F. Room Air Temperature and 50% Relative Humidity with
95 degree F. Outside Air Temperature at 40% Relative Humidity.
7
SS PERFORMANCE DATA
PERFORMANCE EVAPORATOR AIR
OPERATING
PRESSURES
ELECTRICAL
RATINGS
R-22
REFRIG.
BREAKER
FUSE
DATA*
TEMP. DEG. F.
Cooling
Discharge Temp.
Suction Discharge Amps
Locked Charge in 60 Hertz
Air
61.4
61.4
57.8
57.22
57.2
57.22
57.2
56.9
56.9
Drop F.
18.6
18.6
22.2
22.78
22.8
22.9
22.8
23
Rotar Amp
OZ.
39.'0
24.'0
22.6
26.'0
30.'0
29.5
27.5
30.'0
48
Amps
15
15
15
15
15
15
20
20
SS08J10R-B
SS08J10R-A
SS09J10C-A
SS10J10AR-A
SS12J10AR-B
SS14J10R-A
SS12J30D-A
SS16J30A-A
SS18J30R-A
87
84
82
84
83
77
82
77
77
251
248
254
245
271
279
265
296
293
6.7
6.7
7.4
7.5
9.8
29
36.2
44
42
44
61
21
28
45
12
5.0/5.2
7.5/8.0
8.1/8.7
23
20
SM-SL PERFORMANCE DATA
PERFORMANCE EVAPORATOR AIR
OPERATING
PRESSURES
ELECTRICAL
RATINGS
R-22
REFRIG. FUSE
BREAKER
DATA*
TEMP. DEG. F
Cooling
Discharge Temp
Suction Discharge Amps
Locked Charge in 60 Hertz
Air
Drop F.
27.42
25.14
27.68
26.9
Rotar Amp
OZ.
47
54
48.5
50
60
Amps
20
20
20
20
SM20J30-A
SM24J30-A
SL25J30-A
SL28J30B-A
SL35J30-A
SL35J30-B
52.58
54.86
52.32
52.1
52.93
52.93
70
68
75
74
72
72
279
301
284
278
317
317
9.9
12.2
11.5/12.6
13.0/14.2
18.0/20.0
18.0/20.0
43
68
68
88
92
92
27.07
27.07
30
30
60
* Rating Conditions: 80 degree F. Room Air Temperature and 50% Relative Humidity with
95 degree F. Outside Air Temperature at 40% Relative Humidity.
8
WS PERFORMANCE DATA
PERFORMANCE EVAPORATOR AIR
OPERATING
PRESSURES
ELECTRICAL
RATINGS
R-22
REFRIG.
BREAKER
FUSE
DATA*
TEMP. DEG. F.
Cooling
Discharge Temp.
Suction Discharge Amps
Locked Charge in 60 Hertz
Air
59.5
59.5
59.5
58
58
55
55
58
Drop F.
19.5
19.5
19.5
22
22
25
25
22
32.9
33
33
Rotar Amp
OZ.
19
28
20
25
26
28.5
36
22
27.5
42
Amps
15
15
15
15
15
15
15
15
WS07A10E-B
WS07A10E-C
WS07A10E-D
WS10A10-A
WS10A10-B
WS12A10E-B
WS13A10-A
WS09A30E-B
WS12A30E-A
WS12A30E-B
WS15A30-A
84
85
85
83
83
81
79
86
80
80
72
300
299
299
307
307
290
281
302
308
305
310
7.'0
7.'0
7.'0
9.8
9.8
11.9
12
32
32
32
48
48
54
55
44
54
54
42
4.7
47.1
46
47
11.9
11.9
8.5
15
15
15
43.5
WE-WY PERFORMANCE DATA
DATA*
EVAPORATOR
TEMP. DEG. F.
OPERATION
ELECTRICAL
RATINGS
R-22
BREAKER
FUSE
Cooling
PRESSURES
REFRIG.
Discharge Temp.
Suction Discharge Amps
Locked Charge in 60 Hertz
Air
58
55
47.1
58
55
Drop F.
22
25
32.9
22
Rotar Amp
OZ.
23
27.5
43.5
24
Amps
20
20
20
20
WE09A33E-C
WE12A33E-B
WE15A33-A
WY09A33F-A
WY12A33G-A
86
80
71
83
81
302
308
310
288
295
4.7
6.5
8.5
4.3
6.2
44
54
42
44
54
25
37
20
PERFORMANCE Heat Rise
DATA heating
WE15A33-A
WE09A33E-C
WE12A33E-B
40
39
36
16.2
14.7
14.7
* Rating Conditions: 80 degree F. Room Air Temperature and 50% Relative Humidity
95 degree F. Outside Air Temperature at 40% Relative Humidity
9
PERFORMANCE DATA*
SC06H10E
SPECIFICATIONS
BTUH (Cooling)
E.E.R. (Cooling)
Volts
SC06H10E
5950
8.0
DISCHARGE
56.1
EVAPORATOR AIR
TEMP. °F
AIR
TEMP
23.9
115
DROP °F
SUCTION
DISCHARGE
AMPS
Amperes (Cooling)
Total Watts (Cooling)
Hertz
6.8
OPERATING
PRESSURES
72
293
6.8
760
60
Fuse/Breaker Size
Fan RPM
15
ELECTRICAL
RATINGS
1595
125
LOCKED
ROTOR AMPS
CHARGE IN
OUNCES
35.0
14
Evaporator Air CFM
Dehumidification Pts/Hr
Width
2.0
R-22
REFRIG.
COMP.
OIL
1411/16"
1013/16"
27"
Height
CHARGE IN
FLUID OZ.
9.8
Depth
Minimum Ext. Into Room
Minimum Ext. To Outside
Net Weight
2½"
15½"
70
* Rating Conditions:
80°F Room Air Temperature and 50% Relative Humidity with
95°F Outside Air Temperature at 40% Relative Humidity.
Shipping Weight
80
PERFORMANCE DATA
(Heating)
*YS09J10B-A **YS12J33-A
**YM18J34A-A
**YL24J35C-A
AHAM
@ 70°F Inside 47°F Outside
@ 70°F Inside 35°F Outside
8300
12400/12300
10700/8900
17200/17200
13000/10600
23000/22800
17300/14300
Evaporator Air Temperature Rise
@ 70°F Inside 47°F Outside
19.62
6.7
31.38
28.69/23.87
24.74
24.46/20.22
31.71
24.38/20.16
@ 70°F Inside 35°F Outside
AMPS
Watts
@ 70°F Inside 47°F Outside
@ 70°F Inside 35°F Outside
6.0/6.5
16.0/14.7
8.5/9.0
19.5/17.0
10.4/11.5
24.0/22.4
@ 70°F Inside 47°F Outside
@ 70°F Inside 35°F Outside
760
1340/1300
3500/2900
1880/1820
5500/4650
2350/2340
5500/4650
Suction/Head PSIG
@ 70°F Inside 47°F Outside
53.5/222
52.5/251
53/225
54/236.5
* Do not operate below 37° ambient.
** Heating element comes on at 35°F outside ambient and compressor shuts off.
10
PERFORMANCE DATA
(Heating)
*WY09A33F-A
*WY12A33F-A
BTUH
@70°F Inside 62°F Outside
9700
9300
12400
12000
@70°F Inside 57°F Outside
@70°F Inside 52°F Outside
** @70°F Inside 47°F Outside
@70°F Inside 42°F Outside
@70°F Inside 37°F Outside
@70°F Inside 35°F Outside
8800
11400
8200/8100
7600
10800/10400
10000
6800
9000
11000/9100
11000/9100
Evaporator Air Temperature Rise
@70°F Inside 62°F Outside
32.00
30.75
29.10
27.10/26.80
25.10
22.50
36.40/30.10
4.0
37.60
36.40
@70°F Inside 57°F Outside
@70°F Inside 52°F Outside
** @70°F Inside 47°F Outside
@70°F Inside 42°F Outside
@70°F Inside 37°F Outside
@70°F Inside 35°F Outside
@70°F Inside 62°F Outside
@70°F Inside 57°F Outside
@70°F Inside 52°F Outside
** @70°F Inside 47°F Outside
@70°F Inside 42°F Outside
@70°F Inside 37°F Outside
@70°F Inside 35°F Outside
@70°F Inside 62°F Outside
@70°F Inside 57°F Outside
@70°F Inside 52°F Outside
** @70°F Inside 47°F Outside
@70°F Inside 42°F Outside
@70°F Inside 37°F Outside
@70°F Inside 35°F Outside
34.50
32.70/31.50
30.30
27.30
33.30/27.60
5.6
AMPS
3.9
5.5
3.85
5.4
3.8/4.1
3.6
5.3/5.6
5.1
3.4
4.8
16.0/14.7
880
16.0/14.7
1280
Watts
870
1260
860
1220
835/810
800
1175/1155
1130
760
1070
3550/2950
3550/2950
Suction/Head PSIG
@70°F Inside 62°F Outside
66/315
62/285
57/285
53/265
49/215
45/203
44/200
61/325
59/290
53/275
49/255
45/240
41/220
40/215
@70°F Inside 57°F Outside
@70°F Inside 52°F Outside
** @70°F Inside 47°F Outside
@70°F Inside 42°F Outside
@70°F Inside 37°F Outside
@70°F Inside 35°F Outside
*
Heating Element comes on at 35°F outside ambient and compressor shuts off.
** AHAM Rating Conditions.
11
Re frig e ra tion Sys te m
Se q u e n c e of Op e ra tion
Agood understanding of the basic operation of the refrigeration In the case of the capillary tube this is accomplished (by design)
system is essential for the service technician. Without this through size (and length) of device, and the pressure difference
understanding, accurate troubleshooting of refrigeration present across the device.
system problems will be more difficult and time consuming, if
Since the evaporator coil is under a lower pressure (due to the
not (in some cases) entirely impossible. The refrigeration
suction created by the compressor) than the liquid line, the liquid
system uses four basic principles (laws) in its operation they
refrigerant leaves the metering device entering theevaporatorcoil.
are as follows:
As it enters the evaporator coil, the larger area and lower pressure
1. "Heat always flows from a warmer body to a cooler body." allows the refrigerant to expand and lower its temperature (heat
intensity). This expansion is often referred to as "boiling". Since
the unit's blower is moving Indoor air across the finned surface of
the evaporator coil, the expanding refrigerant absorbs some of
2. "Heat must be added to or removed from a substance
before a change in state can occur"
3. "Flow is always from a higher pressure area to a lower that heat. This results in a lowering of the indoor air temperature,
pressure area."
hence the "cooling" effect.
4. "The temperature at which a liquid or gas changes state The expansion and absorbing of heat cause the liquid refrigerant
is dependent upon the pressure."
to evaporate (i.e. change to a gas). Once the refrigerant has
been evaporated (changed to a gas), it is heated even further by
the air that continues to flow across the evaporator coil.
The refrigeration cycle begins at the compressor. Starting
the compressor creates a low pressure in the suction line which
draws refrigerant gas (vapor) into the compressor. The The particular system design determines at exactly what point (in
compressor then "compresses" this refrigerant, raising its the evaporator) the change of state (i.e. liquid to a gas) takes
pressure and its (heat intensity) Temperature.
place. In all cases, however, the refrigerant must be totally
evaporated (changed) to a gas before leaving the evaporator coil.
The refrigerant leaves the compressor through the discharge
line as a hot high pressure gas (vapor). The refrigerant enters The low pressure (suction) created by the compressor causes the
the condenser coil where it gives up some of its heat. The refrigerant to leave the evaporator through the suction line as a
condenser fan moving air across the coil's finned surface cool low pressure vapor. The refrigerant then returns to the
facilitates the transfer of heat from the refrigerant to the compressor, where the cycle is repeated.
relatively cooler outdoor air.
When a sufficient quantity of heat has been removed from
the refrigerant gas (vapor), the refrigerant will "condense" (i.e.
change to a liquid). Once the refrigerant has been condensed
(changed) to a liquid it is cooled even further by the air that
Suction
Line
Discharge
Line
continues to flow across the condenser coil.
The RAC design determines at exactly what point (in the
condenser) the change of state (i.e. gas to a liquid) takes place.
In all cases, however, the refrigerant must be totally condensed
(changed) to a liquid before leaving the condenser coil.
Evaporator
Coil
Condenser
Coil
Compressor
Metering
Device
The refrigerant leaves the condenser coil through the liquid line
as a warm high pressure liquid. It next will pass through the
refrigerant drier (if so equipped). It is the function of the drier to
trap any moisture present in the system, contaminants, and large
particulate matter.
Refrigerant
Drier
Liquid
Line
Refrigerant
Dryer
Theliquidrefrigerantnextentersthemeteringdevice. Themetering
device is a capillary tube. The purpose of the metering device is to
"meter" (i.e. control or measure) the quantity of refrigerant entering
the evaporator coil.
12
Ele c tric a l Ra tin g Ta b le s
Circuit Rating
Breaker or T-D Fuse
Plug Face
(NEMA#)
Appearance
(Facing Blades)
Model
ALL SV and XQ MODELS,
KS10J10, KS12J10B, KS15J10, RS10J10, RS12J10A,
RS15J10, SS08J10R, SS09J10C, SS10J10AR,
SS12J10AR, SS14J10R, SC06H10D,
EQ08J11, YQ06J10B, YS09J10B
125V - 15A
5 - 15P
KS12J30B, KM18J30C, RS16J30A,
250V - 15A
250V - 20A
6 - 15P
6 - 20P
RM18J30A, SS12J30D, SS16J30A, SM18J30BR
KM20J30, KM24J30, SM20J30,
SL25J30, SL28J30B*, ES12J33B,
ES16J33A, YS12J33
SL35J30, EM18J34B, EL25J35, EL35J35,
YM18J34B, YL24J35C
250V - 30A
6 - 30P
* Optional 30 Amp Kit (618-869-00) is recommended in 208 Volt power supply areas that fall below 208 Volts.
For more information, call the Friedrich Service Department.
Due to a program of continuing improvement, specifications are subject to change without notice.
Installation Notes:
Supply Cord - All with right angle plug 6' on 115V; 5' on 230/208V.
Room air conditioners include accessories for window or thru-the-wall installation.
TWINTEMP® models include accessories for thru-the-wall installation only.
Window mounting requires use of optional accessory kit as listed below:
MODEL
KIT NO.
WIKQ
EQ08J11, YQ06J10B
ES12J33B, ES16J33A,
YS09J10B, YS12J33
WIKS
EM18J34B, YM18J34B
WIKM
WIKL
EL25J35, EL35J35,
YL24J35C
Ele c tric s h o c k h a za rd .
Turn off electric power before service or installation.
All electrical connections and wiring MUST be installed by a qualified
electrician and conform to the National Electrical Code and all local
codes which have jurisdiction.
Wire Size
Use ONLY wiring size recommended for
single outlet branch circuit.
Failure to do so can result in property damage, personal injury and/
or death.
Fuse/Circuit
Breaker
Use ONLY type and size fuse or HACR
circuit breaker indicated on unit's rating
plate. Proper current protection to the unit
is the responsibility of the owner.
Grounding
Receptacle
Unit MUST be grounded from branch circuit
through service cord to unit, or through
separate ground wire provided on permanently
connected units. Be sure that branch circuit
or general purpose outlet is grounded.
The field supplied outlet must match plug on
service cord and be within reach of service
cord.
Do NOT alter the service cord or plug. Do
NOT use an extension cord. Refer to the table
above for proper receptacle and fuse type.
The consumer - through the AHAM Room Air Conditioner
Certification Program - can be certain that the AHAM
Certification Seal accurately states the unit's cooling and
heating capacity rating, the amperes and the energy efficiency
ratio.
13
COMPONENTS:
OPERATION & TESTING
Figure 2
Typical Ground Test
WARNING
DISCONNECT ELECTRICAL POWER TO
UNIT BEFORE SERVICING OR TESTING
COMPRESSORS
Compressors are single phase, 115 or 230/208 volt,
depending on the model unit. All compressor motors are
permanent split capacitor type using only a running capacitor
across the start and run terminal.
CHECKING COMPRESSOR EFFICIENCY
The reason for compressor inefficiency is normally due to broken
or damaged suction and/or discharge valves, reducing the ability
of the compressor to pump refrigerant gas.
All compressors are internally spring mounted and externally
mounted on rubber isolators.
This condition can be checked as follows:
WINDING TEST
1. Install a piercing valve on the suction and discharge or
liquid process tube.
Remove compressor terminal box cover and disconnect wires
from terminals. Using an ohmmeter, check continuity across
the following: (See Figure 1)
2. Attach gauges to the high and low sides of the system.
3. Start the system and run a “cooling or heating
performance test.”
1. Terminal "C" and "S" - no continuity - open winding -
replace compressor.
If test shows:
2. Terminal "C" and "R" - no continuity - open winding -
replace compressor.
A. Below normal high side pressure
B. Above normal low side pressure
C. Low temperature difference across coil
3. Terminal "R" and "S" - no continuity - open winding -
replace compressor.
The compressor valves are faulty - replace the
compressor.
Figure 1
THERMAL OVERLOAD (External)
Some compressors are equipped with an external overload
which is located in the compressor terminal box adjacent to
the compressor body (See Figure 3.)
The overload is wired in series with the common motor
terminal. The overload senses both major amperage and
compressor temperature. High motor temperature or
amperage heats the disc causing it to open and break the
circuit to the common motor terminal.
Figure 3- External Overload
GROUND TEST
Use an ohmmeter set on its highest scale. Touch one lead to
the compressor body (clean point of contact as a good con-
nection is a must) and the other probe in turn to each com-
pressor terminal (see Figure 2.) If a reading is obtained, the
compressor is grounded and must be replaced.
14
Heat generated within the compressor shell is usually due to:
FAN MOTOR - TEST
1. Determine that capacitor is serviceable.
1. High amperage
2. Disconnect fan motor wires from fan speed switch or
system switch.
2. Low refrigerant charge
3. Frequent recycling
4. Dirty condenser
3. Apply "live" test cord probes on black wire and common
terminal of capacitor. Motor should run at high speed.
TERMINAL OVERLOAD - TEST
(Compressor - External Type)
4. Apply "live" test cord probes on red wire and common
terminal of capacitor. Motor should run at low speed.
1. Remove overload.
5. Apply "live" test cord probes on each of the remaining
wires from the speed switch or system switch to test
intermediate speeds. If the control is in the
"MoneySaver" mode and the thermostat calls for
cooling, the fan will start - then stop after approximately
2 minutes; then the fan and compressor will start
together approximately 2 minutes later.
2. Allow time for overload to reset before attempting to
test.
3. Apply ohmmeter probes to terminals on overload wires.
There should be continuity through the overload.
TERMINAL OVERLOAD (Internal)
Some model compressors are equipped with an internal
overload. The overload is embedded in the motor windings
to sense the winding temperature and/or current draw. The
overload is connected in series with the common motor
terminal.
Figure 5
Fan Motor
Should the internal temperature and/or current draw become
excessive, the contacts in the overload will open, turning off
the compressor. The overload will automatically reset, but
may require several hours before the heat is dissipated.
CHECKING THE INTERNAL OVERLOAD
(See Figure 4)
Figure 4
Internal Overload
SYSTEM CONTROL PANEL- SQ Models (See Figure 6)
A five-position control switch is used to regulate the operation
of the fan motor and compressor. The compressor can be
operated with the fan operating at low, medium or high speed.
The fan motor can also be operated independently on medium
speed. See switch section as indicated on the decorative
control panel.
Figure 6
System Control Panel (SQ Models Only)
1. With no power to unit, remove the leads from the com-
pressor terminals.
2. Using an ohmmeter, test continuity between terminals
C-S and C-R. If no continuity, the compressor overload
is open and the compressor must be replaced.
FAN MOTOR
Asingle phase permanent split capacitor motor is used to drive
the evaporator blower and condenser fan.Aself-resetting over-
load is located inside the motor to protect against high tem-
perature and high amperage conditions. (See Figure 5)
15
SYSTEM CONTROL SWITCH - TEST (See Figure 7)
Disconnect the leads from the control switch. There must be
continuity as follows:
Rocker Switch
Figure 8
1. "Off" Position - no continuity between terminals.
2. "Lo Cool" Position - between terminals "L1" and "C", "Lo"
and MS".
3. "Med Cool" Position - between terminals "L1" and "C", "M"
and "MS".
4. "Hi Cool" Position - between terminals L1" and "C", "H"
and "MS".
SYSTEM CONTROL PANEL (XQ MODELS ONLY)
5. "Fan Only" Position - between terminals "L1" and "2".
(See Figure 9)
1. Power button turns the unit on and off.
RESISTOR
(Heat Anticipator) (SQ Only)
2. Fan Speed button allows selection between three cool-
ing speeds and fan only.
Failure of the resistor will cause prolonged "off" and "on" cycles
of the unit. When replacing a resistor, be sure and use the
exact replacement. Resistor rating 115 Volts 12500 ohm, 1.05
watts.
3. The mode button allows the unit to switch between modes
(i.e., fan only, cooling, etc.).
4. Timer on/off button allows for programmed on and off
times (one hour increments).
Figure 7
System Switch
(SQ Only)
5. The plus and minus buttons allows adjustments for room
air temperature.
6. Set hour button enables the unit’s timer on/off feature to
operate for times selected.
7. Exhaust/vent shut feature (if applicable) allows for room
air to continuously recalculate or if enabled, to exhaust
stale air.
Note: Please refer the troubleshooting guides on page if the
control is malfunctioning.
Figure 9
MONEYSAVER® SWITCH (Rocker Switch- See Figure 8)
This rocker switch can be depressed to either YES or NO. In
the YES position you will get the most economical operation.
Both the fan and the compressor will cycle on and off together,
maintaining the selected temperature at a more constant level
and reducing the humidity more efficiently. This control will
only operate when the unit is in a cooling mode. In the NO
position, the fan will run constantly as long as the unit is in the
cooling mode. Disconnect leads from switch. Depress switch
to function being tested.
System Control Panel (XQ Models Only)
1. When YES is depressed, there should be continuity
between terminals "1" and "2."
2. When NO is depressed, there should be continuity
between terminals "2" and "3."
16
SYSTEM CONTROL PANEL
EQ Model Only (See Figure 12 )
The EQ Model unit uses a six-position control switch to regulate
the operation of the unit. Function of each position (clockwise
rotation) is as follows:
SYSTEM CONTROL PANEL
("KQ" Models Only- See Figure 10)
The KQ Model unit uses a five position control switch to regu-
late the operation of the unit. Function of each position (clock-
wise rotation) is as follows:
1. “Off” Turns everything off.
Figure 10
2. “Fan Only” To circulate filtered room air, but no cooling
or heating
System Control Panel (KQ Models Only)
3. “Hi Cool” Fan runs continuously, compressor goes on
and off to maintain the selected room temperature
4. “Lo Cool” fan runs continuously, compressor goes on and
off to maintain the selected room temperature.
5. “Lo Heat” Fan runs continuously, heating turns on and
off to maintain the selected room temperature.
6. Hi Heat” Fan runs continuously, heating turns on and off
to maintain the selected room temperature.
Figure 12
1. "Off" - Turns everything off.
System Control Panel (EQ Models only)
2. "Hi Fan" - Maximum circulation of filtered room air (no
cooling.)
3. "Low Fan" - Fan runs slower for less circulation of fil-
tered room air.
4. "Low Cool" - Fan runs slowly for quiet operation when
maximum cooling is not needed.
5. "Hi Cool" - Highest fan speed for maximum cooling.
SYSTEM CONTROLSWITCH - TEST (See Figure 11)Turn knob
to phase of switch to be tested. There must be continuity as fol-
lows:
SYSTEM CONTROL SWITCH – TEST (See Figure 13)
1. "Hi Fan" Position - between terminals "L1" and "H".
2. "Low Fan" Position - between terminals "L1" and "L".
Turn knob to phase of switch to be tested. There must be
continuity as follows:
1. “Fan Only” Position – between terminals “MS” and “H”
3. "Low Cool" Position - between terminals "L1" and "L" and
"C".
2. “Hi Cool” Position – between terminals “L1” and “C” and
“MS” and “H”
4. "Hi Cool" Position - between terminals "L1" and "H" and "C".
3. “Low Cool” Position – between terminals “L1” and “C”
and “MS” and “LO”
4. “Low Heat” Position – between terminals “L2” and “2”
and “MS” and “LO”
Figure 11
System Control Switch
(KQ Models Only)
5. “Hi Heat” Position – between terminals “L2” and “2” and
“MS” and “H”
17
4. "Lo Heat" Position - between terminals "C" and "2", and
"C" and "4".
L1
Figure 13
System Control Switch
(EQ Models)
5. "Hi Heat" Position - between terminals "C" and "1", and
"C" and "4".
B1
L2
MS
C
H
ROTARY (SYSTEM) SWITCH: "SC" Model (See Figure 16)
A rotary four position switch is used to turn on the unit and
select the operation desired. Switch selection is as follows:
2
LO
SYSTEM CONTROL PANEL ("YQ" Model Only)
(See Figure 14)
Figure 15
System Control Switch
(YQ Model Only)
The YQ Model unit uses a six position control switch to regulate
the operation of the unit. Function of each position (Clockwise
rotation) is as follows:
1. "Off" - Turns everything off.
2. "Fan Only" - To circulate filtered room air, but no cooling
or heating.
3. "Hi Cool" - Fan runs continuously, compressor goes on
and off to maintain the selected room temperature.
4. "Lo Cool" - Fan runs continuously, compressor goes on
and off to maintain the selected room temperature.
Figure 16
5. "Lo Heat" - Fan Runs continuously, heating turns on and
off to maintain the selected room temperature.
System Control Panel (SC Model Only)
6. "Hi Heat" - Fan Runs continuously, heating turns on and
off to maintain the selected room temperature.
Figure 14
System Control Panel (YQ Model Only)
1. "Hi Cool" Turns on the compressor and fan at high speed
2. "Lo Cool" Turns on the compressor and fan at low speed.
3. "Fan Only" Turns on the fan at high speed.
4. "Off" Turns everything off.
The switching arrangement of the control is as follows:
(See Figure 17)
SYSTEM CONTROL SWITCH - TEST (See Figure 15)
Turn knob to phase of switch to be tested. There must be
continuity as follows:
1. "Off" All contacts open.
2. "Hi Fan Contacts closed between terminals "L1" and "1".
1. "Fan Only" Position - between terminals "C" and "1".
3. "Hi Cool" Contacts closed between terminals "L1" to "1"
and "L1" and "C".
2. "Hi Cool" Position - between terminals "C" and "1", "C"
and "3".
4. "Lo-Cool" Contacts are closed between terminals "L1"
to "2" and "L1 to "C".
3. "Lo Cool" Position - between terminals "C" and "2", and
"C" and "3".
18
Figure 19
Figure 16
System Control Switch
(WS Models)
System Control Switch
(SC Model Only)
SYSTEM CONTROL SWITCH "WE" & "WY" Models
(See Figure 20)
1. Disconnect leads from control switch.
An eight position switch is used to regulate the operation of
the fan motor, compressor and electric heater. The unit can
be operated in cooling or heating mode with the compressor
or electric heater on and the fan motor operating on low,
medium or high speed.
2. Check continuity between all switch positions shown in
Figure 17.
SYSTEM CONTROL PANEL
"WS" Models (See Figure 18)
The fan motor can also be operated independently on medium
speed. See switch section as indicated on decorative control panel.
A five position control switch is used to regulate the operation
of the fan motor and compressor. The compressor can be
operated with the fan operating at low, medium or high speed.
The fan motor can also be operated independently on medium
speed. See switch section as indicated on decorative control
panel
Figure 20
System Control Panel
(WE & WY Models)
Figure 18
System Control Panel (WS Models)
SYSTEM CONTROL SWITCH - TEST (See Figure 21)
Disconnect leads from control switch. Turn control to position
being tested. There must be continuity as follows:
1. "Off" Position-no continuity between terminals.
SYSTEM CONTROL SWITCH - TEST
Disconnect leads from control switch (See Figure 19)
There must be continuity as follows:
2. "Lo Cool" Position-between terminals "C" and "3", "C2"
and "2", "LO" and "M/S", "AR" and "5".
1. "Off" Position - no continuity between terminals.
2. "Lo Cool" Position - between terminals "L1" and "C", "LO"
and "MS."
3. "Med Cool" Position-between terminals "C" and "3",
"C2" and "2", "M" and "M/S", "AR" and "5".
3. "Med Cool" Position - between terminals "L1" and "C", "M"
and "MS".
4. "Hi Cool" Position-between terminals "C" and "3", "C2"
and "2", "H" and "M/S", "AR" and "5".
4. "Hi Cool" Position - between terminals "L1" and C", "H"
and "MS."
5. "Hi Heat" Position-between terminals "C" and "1", "C2"
and "4", "H" and "M/S", "AR" and "5".
5. "Fan Only" Position - between terminals "L1" and "2."
19
6. "Med Heat" Position-between terminals "C" and "1", SYSTEM CONTROL SWITCH - TEST (See Figure 23)
"C2" and "4", "M" and "M/S", "AR" and "5".
Disconnect leads from control switch. There must be continuity
as follows:
7. "Lo Cool" Position-between terminals "C" and "1", "C2"
and "4", "LO" and "M/S", "AR" and "5".
1. "Off" Position - no continuity between terminals.
2. "Lo Cool" Position - between terminals "L1" and "C," "LO"
and "MS."
8. "Fan Only" Position-between terminals "L1" and "M".
3. "Med Cool" Position - between terminals "L1" and "C,"
"M" and "MS."
Figure 21
4. "Hi Cool" Position - between terminals "L1" and "C,"
"H"and "MS."
System Control Switch
Heat Pump / Electric Heat
(WE & WY Models)
5. "Fan Only" Position - between terminals "L1" and "2."
Figure 23
System Control Switch
SYSTEM CONTROL SWITCH KS, SS, KM, SM, SL Models
(See Figure 22)
A five position control switch is used to regulate the operation of
the fan motor and compressor. The compressor can be operated
with the fan operating at low, medium or high speed. The fan
motor can also be operated independently on medium speed.
See switch section as indicated on decorative control panel.
SYSTEM CONTROL PANEL (See Figure 24)
A six-position control switch is used to regulate the operation of
the fan motor and compressor. The compressor can be operated
with the fan operating at low, medium or high speed. The fan
motor can also be operated independently on medium speed.
See switch section as indicated on decorative control panel.
Figure 22
System Control Panel (KS, SS, KM, SM, SL)
Figure 24
System Control Panel - Deluxe Series (RS & RM)
20
SYSTEM CONTROL SWITCH - TEST
Disconnect leads from control switch (See Figure 25)
There must be continuity as follows:
SYSTEM CONTROL SWITCH
(Heat Pump & Electric Heat Models) (See Figure 27)
An eight position control switch is used to regulate the
operation of the fan motor and compressor. The compressor
can be operated with the fan operating at low, medium or high
speed in the cooling or heating mode. The fan motor can also
be operated independently on medium speed. See switch
section as indicated on decorative control panel.
Figure 25
1. "Off" Position - everything is off.
2. "Lo Cool" Position - fan operates on low speed,
compressor is on.
3. "Med Cool" Position - fan operates on medium speed,
compressor is on.
4. "Hi Cool" Position - fan operates on high speed,
compressor is on.
5. "Hi Heat" Position - fan operates on high speed,
compressor or electric heater is on.
SYSTEM CONTROL SWITCH (See Figure 26)
(Heat Pump & Electric Heat Models)
6. "Med Heat" Position - fan operates on medium speed,
compressor or electric heater is on.
An eight position control switch is used to regulate the
operation of the fan motor and compressor. The compressor
can be operated with the fan operating at low, medium or high
speed in the cooling or heating mode. The fan motor can also
be operated independently on medium speed. See switch
section as indicated on decorative control panel.
7. "Lo Heat" Position - fan operates on low speed,
compressor or electric heater is on.
8. "Fan Only" Position - operates on medium speed.
NOTE: Heat pump models with electric heat - in the heat
position, heating element only will be energized when outdoor
temperature is below the operating range of the heat pump.
1. "Off" Position - everything is off.
2. "Lo Cool" Position - fan operates on low speed,
compressor is on.
Figure 27
System Control Panel
Heat Pump & Electric Heat Models
(YS, ES, YM, EM, YL & EL)
3. "Med Cool" Position - fan operates on medium speed,
compressor is on.
4. "Hi Cool" Position - fan operates on high speed,
compressor is on.
5. "Hi Heat" Position - fan operates on high speed,
compressor or electric heater is on.
6. "Med Heat" Position - fan operates on medium speed,
compressor or electric heater is on.
Figure 26
System Control Switch
21
SYSTEM CONTROL SWITCH - TEST (See Figure 28)
Disconnect leads from control switch. Turn control to position
being tested. There must be continuity as follows:
TO ADJUST TEMPERATURE
COOLER - Touch COOLER to see setting, touch again to
change.
WARMER - Touch WARMER to see setting, touch again to
1. "Off" Position - no continuity between terminals.
change.
2. "Lo Cool" Position - between terminals "C" and "3", "C2"
and "2", "LO" and "M/S", "AR" and "5".
Touch °F/°C to show desired temperature in Fahrenheit or
Celsius.
3. "Med Cool" Position - between terminals "C" and "3", "C2"
and "2", "M" and "M/S", "AR" and "5".
TO ADJUST FAN SPEED
Touch SPEED to see current setting. Touch again to change
speed. F1 is lowest setting (sleep setting), F2 is LOW, F3 is
MED, and F4 is HIGH.
4. "Hi Cool" Position - between terminals "C" and "3", "C2"
and "2", "H" and "M/S", "AR" and "5".
TO ACTIVATE SMART FAN
5. "Hi Heat" Position - between terminals "C" and "1", "C2"
and "4", "H" and "M/S", "AR" and "5".
Touch SMART FAN (light on). Smart Fan will adjust the fan
speed automatically to maintain the desired comfort level. For
example, if the outside doors in the home are open for an
extended period of time, or more people enter a room, Smart
Fan may adjust to a higher fan speed to compensate for the
increased heat load. This keeps from having to adjust the fan
speed on your own, or from having to change the desired
temperature you have selected. Smart Fan will also run to
test temperature if the off cycle is long.
6. "Med Heat" Position - between terminals "C" and "1", "C2"
and "4", "M" and "M/S", "AR" and "5".
7. "Lo Cool" Position - between terminals "C" and "1", "C2"
and "4", "LO" and "M/S", "AR" and "5".
8. "Fan Only" Position - between terminals "L1" and "M".
Figure 28
System Control Switch
(Heat Pump / Electric
Heat Models
Figure 29
Electronic Control
Smart Center Electronic Control Center
(See Figure 29)
FILTERALERT light will come on after 250 hours of use. Touch
FILTER ALERT to reset.
TO SET MODE OF OPERATION
When unit is first turned on, it will be in the COOL mode (light
on), with constant fan.
Touch MONEYSAVER (light on) to activate the MoneySaver
feature. (MoneySaver is a feature that cycles the fan with the
compressor so that the fan does not run all the time. This
saves energy and improves dehumidification.) If customer
prefers a constant fan for more air movement, touch
MONEYSAVER again and unit will return to constant fan.
Touch FAN ONLY (light on) and only the fan will run. This
feature may be used in conjunction with the FRESH AIR/
EXHAUST lever to bring outside air into a room, or to exhaust
stale air.
22
Activating Error Code Mode: (Submode of Test Mode) Unit
TO SET HOUR CLOCK
has to be in Test Mode to enter Error Code Mode
Touch SET HOUR CLOCK to see setting. To change, touch
and hold until hour closest to the actual time appears in the
display. MAKE SURE A.M. AND P.M. ARE SET PROPERLY.
(Minutes will NOT show on display.)
1. Activate Error Code Mode by pressing the "TIMER ON/
OFF" button on XQ models. LED for the "TIMER ON/OFF"
will flash 1 bps while Error Code Mode is active. Pressing
the "TEMP/HR + " button will display 00. Consecutive
presses will scroll through all error codes logged. Press
the "TEMP/HR - " button to see the reverse order of all
error codes logged. When the end of logged error codes is
reached the temperature set point will appear.
TO SET THE TIMER
NOTE: SET HOUR CLOCK before attempting to set timer
functions.
The TIMER ON/OFF times can be set a minimum of one
hour apart and a maximum of twenty-three hours apart.
Activate Error Code Mode by pressing at the same time
the "A/C START" button and the "ON/OFF" button on QME
models. LED for the "TIMER ON/OFF" will flash 1 bps while
Error Code Mode is active. Pressing the "WARMER" button
will display 00. Consecutive presses will scroll through all
error codes logged. Press the "COOLER" button to see
the reverse order of all error codes logged. When the end
of logged error codes is reached the temperature set point
will appear.
STOP TIME - Touch A/C STOP and hold until the hour the
unit needs to shut off appears in the display A.M. or P.M.)
START TIME - Touch A/C START and hold until the hour the
unit needs to come on appears in the display (A.M. or P.M.)
Touch TIMER ON (light on) to activate the timer function. Touch
TIMER OFF (light off) to cancel the timer function desired.
Once the on and off times have been selected, they will remain
in memory, and cycle daily until changed, or until the unit is
subject to a power interruption.
IMPORTANT: Error Codes are cleared from the log
by exiting from Error Code Mode. To exit on XQ mod-
els, press Timer On/Off button. To exit QME models,
press A/C Start and On/Off buttons. Or unplug unit to
exit Error Code Mode. Plug unit in after 5 seconds to
resume normal operation of unit.
TESTING THE ELECTRONIC CONTROL
2003 XQ BOARDS & QME BOARDS
Checking Room Temperature:
1. Check the room temperature at the electronic control pad
by pressing the "FAN SPEED" button and the temperature
"UP" button at the same time on XQ models.
TESTING THE ELECTRONIC CONTROL
2. Check the room temperature at the electronic control pad
by pressing at the same time the "FAN SPEED" button
and the "WARMER" button on QME models.
ERROR CODE LISTINGS
E1 SHORT CYCLE SITUATION: Defined as (compressor
powered on before the three minute time delay ten times in
one hour. Investigate and correct short cycling problem.
E2 KEYBOARD STUCK ERROR: If key button(s) are pressed
continuously for twenty seconds or more. If MODE key is stuck,
unit will default to cool. Exit Error Code Mode to see if error
"E2" is no longer displayed and unit is functioning. Replace
board if "E2" still displays after exiting Error Code Mode.
E3 FROST PROBE OPEN: Normal operation is allowed. Ohm
frost probe. Replace probe if ohm value not read. If ohm value
present replace board.
The indoor temperature will display for 10 seconds. Indoor
temperature can be viewed in all modes, including the TEST
mode. The display can be changed back to SET
temperature by pressing any key, except the ON/OFF
button, or after 10 seconds has elapsed.
Activating Test Mode: Activate test mode by pressing at
the same time the "MODE" button and the temperature
"DOWN" button on XQ models. LEDs for Hour, Start, and
Stop will blink 1 bps while Test Mode is active.
E4 FROST PROBE SHORT: Normal operation allowed.
Replace probe.
E5 INDOOR PROBE OPEN: Control assumes indoor ambient
temperature is 90 degree F and unit will operate. Ohm indoor
probe. Replace probe if ohm value not read.
E6 INDOOR PROBE SHORT: Control assumes ambient
temperature is 90 degree F and unit will operate. Replace
probe.
NOTE: All Error Code displays for Frost & Indoor Probe will
allow unit to operate. Unit may or will ice up if faulty components
not replaced.
Activate test mode by pressing at the same time the
"MONEY SAVER" button and the "FILTERALERT" button
on QME models. LED for the Filter Alert will blink 1 bps
while Test Mode is active.
Test Mode has duration of 90 minutes. Test Mode can be
activated under any conditions, including Off. Test Mode is
cancelled by pressing the On/Off button, unplugging the
unit, or when the 90 minutes is timed out. All settings revert
to the factory default settings of Cool, 75 degrees F, Timer
and Set Hour features are nonfunctional.
Test Mode overrides the three-minute lockout, all delays
for compressor and fan motor start / speed change, and no
delay when switching modes.
FROST PROBE SENSOR: disables compressor at 35
degrees F.
INDOOR PROBE SENSOR: Control range is 60 degrees F
to 90 degrees F +/- 2 degrees F.
Test Mode default settings are ON, Money Saver, 60 degrees F,
and High fan speed
.
Indoor temperature will be displayed by pressing:
23
(QME Units) The Fan Speed button and the Warmer button.
( XQ Units) The Fan Speed button and the Temp Up button.
The indoor temperature will be displayed for 10 seconds. The
display will change back to the Set Point temperature by
pressing any key button except for the On/Off button. The
indoor temperature can be viewed in all modes, including test
mode.
Figure 31
Thermostat
(YQ Models Only)
Filter Alert: The Filter Alert indicator turns on after the fan
motor has been operating for 250 hours. The Filter Alert
indicator is reset by pressing the Filter Alert button one time
only,. Power failures will not reset the 250 hour timer. All time
elapsed is stored in memory and resumes counting after power
is restored.
TEST:
Keep Alive: The electronic control has a memory to retain all
functions and status as set up by the user in the event of a
power failure. Once power is restored to the unit there is a
two second delay before the fan comes on and approximately
three minutes delay before the compressor is activated,
providing that the mode was set for cooling and the set point
temperature has not been met in the room.
1. Remove leads from thermostat.
2. Turn thermostat knob clockwise to its coldest position.
3. Test for continuity between the two terminals. Contacts
should be closed.
4. Turn thermostat knob counterclockwise to its warmest
position.
5. Test for continuity - contacts should be open.
THERMOSTAT ("SQ & KQ" Models) - See Figure 30.
NOTE: The thermostat must be within the temperature
range listed to open and close.
Thermostat is used to cycle the compressor on and off at the
comfort level desired. The thermostat has a range from 60°
±2°F to 90° ±4°F, with a differential of 5°F. Turning the knob
clockwise lowers the indoor room temperature setting, while
turning the knob counter clockwise raises the indoor
temperature.
To maintain the comfort level desired, a cross ambient type
thermostat is used.The thermostat has a range from 65° ±2°F
to 87° ±3°F. The thermostat bulb is positioned in front of the
evaporator coil to sense the return air temperature. Thermo-
stat malfunction or erratic operation is covered in the trouble-
shooting section of this manual.
TEST:
Remove wires, turn thermostat to its coldest position. Check
for continuity between the two terminals. Turn thermostat to
warmest position, check continuity to see if contacts open.
NOTE: Temperature must be in range listed to check
thermostat.
TEST:
1. Remove leads from thermostat.
2. Turn thermostat knob clockwise to its coldest position.
3. Test for continuity between the two terminals. Contacts
should be closed.
Figure 30
4. Turn thermostat knob counterclockwise to its warmest
position.
Thermostat
5. Test for continuity - contacts should be open.
NOTE: The thermostat must be within the temperature range
listed to open and close.
THERMOSTAT - Models ES, YS, EM, YM, EL, YL
(See Figure 32)
A cross ambient thermostat is used on all heat pump and
electric heat units. In addition to cycling the unit in a heating
or cooling operation, the thermostat will terminate the cooling
cycle in the event ice forms on the evaporator coil, in this
case the thermostat functions as a de-ice control. A resistor
(anticipator) is positioned within a plastic block to supply a
small amount of heat to the bulb area to prevent long "off
cycles" in the "Cool-Fan Auto" (MoneySaver) position (see
Figure 8.) Acurrent feedback through the fan motor windings
during "off cycle" completes the circuit to the resistor.
THERMOSTAT ("YQ" Model Only) (See Figure 31)
This thermostat is single pole-double throw, cross ambient
with a range of 60° to 92°F and a differential of ±2°F. Terminal
"2" is common.
24
In the heating cycle, the heat anticipator is energized to supply
a small amount of heat during the "on" cycle. This will open
the contacts in the thermostat prematurely to maintain a closer
differential between the "cut in" and "cut out" temperature.
The heat anticipator is energized in the heating mode
regardless of whether fan is placed in the automatic
(MoneySaver) or constant run position.
Figure 34
Thermostat Bulb Location
(KQ, YQ & SC Models Only)
Thermostat sensor holder
020 to be positioned between
the 4th and 5th and 6th and
7th rows of tubes from the
bottom of the coil at
RANGE:
Cooling Model Thermostat
60°F (±2°) to 92°F (±4°),
dimension shown
TEST:
Cooling/Heating Models: Remove wires from thermostat
and check continuity between terminal "2" (common) and "3"
for cooling. Check between terminals "2" (common) and "1"
for heating. Also check that contacts in thermostat open after
placing in either position. NOTE: Temperature must be within
range listed to check thermostat. Refer to the troubleshooting
section in this manual for additional information on thermostat
testing.
DEFROST THERMOSTAT (Heat Pump Models Only)
(See Figure 35)
This thermostat is single pole - double throw with contacts
between terminals "2" and "3" closing on temperature rise
and contacts between terminals "2" and "1" closing on
temperature fall. When the contacts between terminals "2"
and "1" make, power is supplied to the heater element.
THERMOSTAT ADJUSTMENT
No attempt should be made to adjust thermostat. Due to the
sensitivity of the internal mechanism and the sophisticated
equipment required to check the calibration, it is suggested
that the thermostat be replaced rather than calibrated.
Thermostat bulb must be straight to insure proper
performance.
This control is dual purpose control that acts as an outdoor
thermostat and defrost control.
When the sensing bulb, attached to the condenser coil, senses
enough icing on the outdoor coil, it will interrupt power to the
compressor and supply power to the heating element until
the coil temperature reaches above 43°, then the heater will
shut off and the unit will resume operating in the reverse cycle
mode.
Figure 32
Thermostat
When the outdoor coil temperature drops below 20°, the unit
will operate in electric heat mode continuously until the outdoor
coil temperature rises above 43°.
The fan motor will not turn off when defrost occurs, and the 4-
way valve will not reverse.
Figure 35
Defrost Thermostat
(Heat Pump Models)
THERMOSTAT BULB LOCATION
The position of the bulb is important in order for the thermostat
to function properly. The bulb of the thermostat should be
located approximately 45° to a maximum of 60° from
horizontal.Also, do not allow the thermostat bulb to touch the
evaporator coil. (See Figures 33 and 34)
Figure 33
Thermostat Bulb Location
(SQ Models Only)
Thermostat sensor holder
020 and anticipator
(4712D-140) to be
positioned between the
4th and 5th and 6th and
7th rows of tubes from
the bottom of the coil at
dimension shown
25
DEFROST BULB LOCATION (Heat Pump Models Only)
CAPACITOR, RUN (See Figure 38)
(See Figure 36)
Arun capacitor is wired across the auxiliary and main winding
The defrost control bulb must be mounted securely and in the of a single phase permanent split capacitor motor such as the
correct location to operate properly.
compressor and fan motor. Asingle capacitor can be used for
each motor or a dual rated capacitor can be used for both.
The capacitor's primary function is to reduce the line current
while greatly improving the torque characteristics of a motor.
The capacitor also reduces the line current to the motor by
improving the power factor of the load. The line side of the
capacitor is marked with a red dot and is wired to the line side
of the circuit.
Figure 36
Defrost Thermostat Bulb
Location (All Heat Pump Models)
Figure 38
Dual Rated Run Capacitor Hook-up
Slide the bu
end of the
thermostat
defrost und
the retainer
shown
CAPACITOR - TEST
1. Remove capacitor from unit.
2. Check for visual damage such as bulges, cracks, or leaks.
3. For dual rated, apply an ohmmeter lead to common
(C) terminal and the other probe to the compressor
(HERM) terminal. A satisfactory capacitor will cause a
deflection on the pointer, then gradually move back to
infinity.
RESISTOR: Heat Anticipator (See Figure 37)
Failure of the resistor will cause prolonged "off" and "on" cycles
of the unit. When replacing a resistor, be sure and use the
exact replacement. Resistor ratings are as follows:
4. Reverse the leads of the probe and momentarily touch
the capacitor terminals. The deflection of the pointer
should be two times that of the first check if the capacitor
is good.
115 Volt - 5,000 ohms 3 watt
230 Volt - 20,000 ohms 3 watt
5. Repeat steps 3 and 4 to check fan motor capacitor.
NOTE: Ashorted capacitor will indicate a low resistance and
the pointer will move to the "0" end of the scale and remain
there as long as the probes are connected.
Figure 37
Resistor
An open capacitor will show no movement of the pointer when
placed across the terminals of the capacitor.
26
CHECK VALVE (See Figure 39)
A unique two-way check valve is used on the reverse cycle
heat pumps. It is pressure operated and used to direct the
flow of refrigerant through a single filter drier and to the proper
capillary tube during either the heating or cooling cycle
Figure 40
Figure 39
One-way Check Valve
(Heat Pump Models)
(TO OUTDOOR COIL)
(TO INDOOR COIL)
NOTE: The slide (check) inside the valve is made of teflon.
Should it become necessary to replace the check valve, place a
wet cloth around the valve to prevent overheating during the
brazing operation.
HEATING MODE (see Figure 41)
In the heating mode of operation, liquid refrigerant from the
indoor coil enters the heating check valve forcing the cooling
check valve shut. The liquid refrigerant is directed into the
liquid dryer after which the refrigerant is metered through the
heating capillary tubes to outdoor coils. (Note: liquid refriger-
ant will also be directed through the cooling capillary tubes in
a continuous loop during the heating mode).
CHECK VALVE OPERATION
In the cooling mode of operation, high pressure liquid enters the
check valve forcing the slide to close the opposite port (liquid
line) to the indoor coil. Refer to refrigerant flow chart. This directs
the refrigerant through the filter drier and cooling capillary tube
to the indoor coil.
Figure 41
In the heating mode of operation, high pressure refrigerant enters
the check valve from the opposite direction, closing the port (liquid
line) to the outdoor coil. The flow path of the refrigerant is then
through the filter drier and heating capillary to the outdoor coil.
Failure of the slide in the check valve to seat properly in either
mode of operation will cause flooding of the cooling coil. This is
due to the refrigerant bypassing the heating or cooling capillary
tube and entering the liquid line.
(TO OUTDOOR COIL)
(TO INDOOR COIL)
COOLING MODE (See Figure 40)
In the cooling mode of operation, liquid refrigerant from con-
denser (liquid line) enters the cooling check valve forcing the
heating check valve shut. The liquid refrigerant is directed
into the liquid dryer after which the refrigerant is metered
through cooling capillary tubes to evaporator. (Note: liquid
refrigerant will also be directed through the heating capillary
tubes in a continuous loop during the cooling mode).
HEAT PUMPS: REVERSING VALVE (See Figure 42)
A reversing valve is used to change the refrigerant flow within
the system to permit heating or cooling.
The reversing valve consists of a main valve body which houses
the slide and piston, plus a pilot valve which is activated by a
solenoid.
27
There are three tubes connected to one side of the main
valve body and one tube on the opposite side. The single
tube is connected to the compressor discharge line. The
center tube on the opposite side is the common suction line
to the compressor. The outside tubes are connected to the
indoor and outdoor coils.
air flow through the outdoor coil and allow the discharge
pressure to build in the system. Then switch the system from
heating to cooling.
If the valve is stuck in the heating position, block the air flow
through the indoor coil and allow discharge pressure to build
in the system. Then switch the system from heating to cooling.
The pivot valve is responsible for directing the refrigerant
flow to the indoor or outdoor coil. There are three small tubes
connected to the pilot valve body. The center pilot tube is the
common pilot tube and is connected to the center suction
line. The outside tubes are connected to each end of the
main valve body. The pilot valve consists of a needle valve
and spring.
Should the valve fail to shift in either position after increasing
the discharge pressure, replace the valve.
NOTE: When brazing a reversing valve into the system, it is
of extreme importance that the temperature of the valve does
not exceed 250° F at any time.
When the solenoid is de-energized, the spring tension closes
one pilot port while the other remains open. When the
solenoid is energized, the opposite end is closed. The piston
in the main valve is pressure operated and will always travel
in the direction of the open pilot tube port which provides a
path to the center tube. Pressure which will increase in the
opposite side of the valve will escape through a bleed port
located in each piston. When de-energized, the valve will be
in the cooling position.
Wrap the reversing valve with a large rag saturated with water.
"Re-wet" the rag and thoroughly cool the valve after each
brazing operation of the four joints involved.
The wet rag around the reversing valve will eliminate
conduction of heat to the valve body when brazing the line
connection.
SOLENOID COIL (Heat Pump Models Only)
(See Figure 42)
The solenoid coil is an electromagnetic type coil mounted on
the reversing valve and is energized during the operation of
the compressor in the heating cycle.
Figure 42
Reversing Valve
Should the reversing valve fail to shift during the heating cycle,
test the solenoid coil.
TO TEST:
1. Disconnect power to unit.
2. Disconnect coil leads.
3. Attach probes of an ohmmeter to each coil lead and check
for continuity.
TESTING REVERSING VALVE
Occasionally, the reversing valve may stick in the heating or NOTE: Do not start unit with solenoid coil removed from
cooling position or in the mid-position.
valve, or do not remove coil after unit is in operation.
This will cause the coil to burn out.
When stuck in the mid-position, part of the discharge gas from
the compressor is directed back to the suction side, resulting
in excessively high suction pressure.
Figure 43
Bellows Assembly
Drain Pan Valve
Check the operation of the valve by starting the system and
switching the operation from "Cooling" to "Heating" and then
back to "Cooling". Do not hammer on valve.
If valve fails to change its position, test the voltage to the valve
coil while the system is in the heating cycle. If voltage to coil is
satisfactory, replace reversing valve.
Should the valve fail to shift from cooling to heating, block the
28
VALVE, DRAIN PAN (See Figure 43)
Should the fan motor fail or filter become clogged, the high
During the cooling mode of operation, condensate which limit control will open and interrupt power to the heater before
collects in the drain pan is picked up by the condenser fan reaching an unsafe temperature condition.
blade and sprayed onto the condenser coil. This assists in
cooling the refrigerant plus evaporating the water.
The control is designed to open at 110°F ±6°F. Test continuity
below 110°F and for open above 110°F.
During the heating mode of operation, it is necessary that
water be removed to prevent it from freezing during cold The heating element for the "Y" model is energized by an
outside temperatures. This could cause the condenser fan outdoor thermostat. The outdoor thermostat is adjusted at a
blade to freeze in the accumulated water and prevent it from predetermined temperature to bring on the heating element
turning.
and turn off the compressor. The room thermostat will then
control the cycling of the element when the selected indoor
To provide a means of draining this water, a bellows type temperature is reached.
drain valve is installed over a drain opening in the base pan.
Testing of the elements can be made with an ohmmeter across
This valve is temperature sensitive and will open when the the terminals after the connecting wires have been removed.
outside temperature reaches 40°F. The valve will close A cold resistance reading of approximately 14.5 ohms for the
gradually as the temperature rises above 40°F to fully close 3.3 KW heater, 11.9 ohms for the 4.0 KW heater and 9.15
at 60°F.
ohms for the 5.2 KW heater should be registered.
SEALED REFRIGERATION SYSTEM REPAIRS
IMPORTANT
HEATING ELEMENT (See Figure 44)
All heat pumps and electric heat models are equipped with a
heating element with the exception of the YS09J10. The "YS",
"ES" and "EK12" models are equipped with a 3.3 KW element.
The "YM", "EM" and "EK18" models are equipped with a 4.0
KW element. The "YL" and "EL" models are equipped with a
5.2 KW element.
ANY SEALED SYSTEM REPAIRS TO HEAT PUMP
MODELS REQUIRES THE INSTALLATION OF A
SUCTION LINE DRIER IN THE SUCTION LINE
BETWEEN THE EVAPORATORAND THE REVERSING
VALVE.
The heating element contains a fuse link and a heater limit
switch. The fuse link is in series with the power supply and will
open and interrupt the power when the temperature reaches
161.6°F, or a short circuit occurs in the heating element. Once
the fuse link separates, a new fuse link must be installed.
NOTE: Always replace with the exact replacement.
EQUIPMENT REQUIRED
1. Voltmeter
2. Ammeter
The heater element has a high limit control. This control is a
bimetal thermostat mounted in the top of the heating element.
3. Ohmmeter
4. E.P.A. Approved Refrigerant Recovery System.
5. Vacuum Pump (capable of 200 microns or less vacuum.)
6. Acetylene Welder
Figure 44 - Heating Element
7. Electronic Halogen Leak Detector (G.E. Type H-6 or
equivalent.)
8. Accurate refrigerant charge measuring device such as:
a. Balance Scales - 1/2 oz. accuracy
b. Charging Board - 1/2 oz. accuracy
9. High Pressure Gauge - (0 - 400 lbs.)
10. Low Pressure Gauge - (30 - 150 lbs.)
11. Vacuum Gauge - (0 - 1000 microns)
29
microns. Pressure system to 5 PSIG and leave in
system a minimum of 10 minutes. Release refrigerant,
and proceed with evacuation of a pressure of 200
microns or less.
EQUIPMENT MUST BE CAPABLE OF:
1. Recovery CFC's as low as 5%.
11. Break vacuum by charging system from the high side
with the correct amount of refrigerant specified. This
will prevent boiling the oil out of the crankcase.
2. Evacuation from both the high side and low side of the
system simultaneously.
3. Introducing refrigerant charge into high side of the sys-
tem.
NOTE: If the entire charge will not enter the high side,
allow the remainder to enter the low side in
small increments while operating the unit.
4. Accurately weighing the refrigerant charge actually in-
troduced into the system.
12. Restart unit several times after allowing pressures to
stabilize. Pinch off process tubes, cut and solder the
ends. Remove pinch off tool, and leak check the
process tube ends.
5. Facilities for flowing nitrogen through refrigeration tub-
ing during all brazing processes.
SPECIAL PROCEDURE IN THE CASE OF
COMPRESSOR MOTOR BURNOUT
1. Recover all refrigerant and oil from the system.
HERMETIC COMPONENT REPLACEMENT
The following procedure applies when replacing components
in the sealed refrigeration circuit or repairing refrigerant leaks.
(Compressor, condenser, evaporator, capillary tube, refrigerant
leaks, etc.)
2. Remove compressor, capillary tube and filter drier
from the system.
1. Recover the refrigerant from the system at the process
tube located on the high side of the system by installing
a line tap on the process tube.Apply gauge from process
tube to EPA approved gauges from process tube to
EPA approved recovery system. Recover CFC's in
system to at least 5%.
3. Flush evaporator condenser and all connecting tubing
with dry nitrogen or equivalent, to remove all
contamination from system. Inspect suction and
discharge line for carbon deposits. Remove and clean
if necessary.
4. Reassemble the system, including new drier strainer
and capillary tube.
2. Cut the process tube below pinch off on the suction
side of the compressor.
5. Proceed with processing as outlined under hermetic
component replacement.
3. Connect the line from the nitrogen tank to the suction
process tube.
4. Drift dry nitrogen through the system and un-solder the
more distant connection first. (Filter drier, high side
process tube, etc.)
ROTARY COMPRESSOR SPECIAL
TROUBLESHOOTING AND SERVICE
Basically, troubleshooting and servicing rotary compressors
is the same as on the reciprocating compressor with only a
few exceptions.
5. Replace inoperative component, and always install a
new filter drier. Drift dry nitrogen through the system
when making these connections.
1. Because of the spinning motion of the rotary, the
mounts are critical. If vibration is present, check the
mounts carefully.
6. Pressurize system to 30 PSIG with proper refrigerant
and boost refrigerant pressure to 150 PSIG with dry
nitrogen.
2. The electrical terminals on the rotary are in a different
order than the reciprocating compressors. The
terminal markings are on the cover gasket. Use your
wiring diagram to insure correct connections.
7. Leak test complete system with electric halogen leak
detector, correcting any leaks found.
8. Reduce the system to zero gauge pressure.
REFRIGERANT CHARGING
9. Connect vacuum pump to high side and low side of
system with deep vacuum hoses, or copper tubing. (Do
not use regular hoses.)
NOTE: BECAUSE THE RAC SYSTEM IS A SEALED
SYSTEM, SERVICE PROCESS TUBES WILL HAVE TO
BE INSTALLED. FIRST INSTALL A LINE TAP AND
REMOVE REFRIGERANT FROM SYSTEM. MAKE
NECESSARY SEALED SYSTEM REPAIRS AND
VACUUM SYSTEM. CRIMP PROCESS TUBE LINE AND
SOLDER END SHUT. DO NOT LEAVE A SERVICE
VALVE IN THE SEALED SYSTEM.
10. Evacuate system to maximum absolute holding
pressure of 200 microns or less. NOTE: This process
can be speeded up by use of heat lamps, or by breaking
the vacuum with refrigerant or dry nitrogen at 5,000
30
Proper refrigerant charge is essential to proper unit
operation. Operating a unit with an improper refrigerant
charge will result in reduced performance (capacity) and/or
efficiency. Accordingly, the use of proper charging methods
during servicing will insure that the unit is functioning as
designed and that its compressor will not be damaged.
METHOD OF CHARGING
The acceptable method for charging the RAC system is the
Weighed in Charge Method. The weighed in charge method
is applicable to all units. It is the preferred method to use, as
it is the most accurate.
The weighed in method should always be used whenever a
charge is removed from a unit such as for a leak repair,
compressor replacement, or when there is no refrigerant
charge left in the unit. To charge by this method, requires the
following steps:
Too much refrigerant (overcharge) in the system is just as
bad (if not worse) than not enough refrigerant
(undercharge). They both can be the source of certain
compressor failures if they remain uncorrected for any
period of time. Quite often, other problems (such as low air
flow across evaporator, etc.) are misdiagnosed as
refrigerant charge problems. The refrigerant circuit
diagnosis chart will assist you in properly diagnosing these
systems.
1. Install a piercing valve to remove refrigerant from the
sealed system. (Piercing valve must be removed from
the system before recharging.)
2. Recover Refrigerant in accordance with EPAregulations.
An overcharged unit will at times return liquid refrigerant
(slugging) back to the suction side of the compressor 3. Install a process tube to sealed system.
eventually causing a mechanical failure within the compressor.
This mechanical failure can manifest itself as valve failure, 4. Make necessary repairs to system.
bearing failure, and/or other mechanical failure. The specific
type of failure will be influenced by the amount of liquid being 5. Evacuate system to 250 - 300 microns or less.
returned, and the length of time the slugging continues.
6. Weigh in refrigerant with the property quantity of R-22
Not enough refrigerant (Undercharge) on the other hand, will
cause the temperature of the suction gas to increase to the
refrigerant.
point where it does not provide sufficient cooling for the 7. Start unit, and verify performance.
compressor motor. When this occurs, the motor winding
temperature will increase causing the motor to overheat and 8. Crimp the process tube and solder the end shut.
possibly cycle open the compressor overload protector.
Continued overheating of the motor windings and/or cycling
of the overload will eventually lead to compressor motor or
overload failure.
NOTE: In order to access the sealed system it will be necessary to install Schrader type fittings to the process
tubes on the discharge and suction of the compressor. Proper recovery refrigerant procedures need to be adhered
to as outlined in EPARegulations. THIS SHOULD ONLY BEATTEMPTED BY QUALIFIED SERVICE PERSONNEL.
Un d e rc h a rg e d Re frig e ra n t Sys te m s
An undercharged system will result in poor performance (low Intermittent frosting and thawing of the evaporator is another
pressures, etc.) in both the heating and cooling cycle.
indication of a low charge, however, frosting and thawing can
also be caused by insufficient air over the evaporator.
Whenever you service a unit with an undercharge of
refrigerant, always suspect a leak. The leak must be repaired Checks for an undercharged system can be made at the
before charging the unit.
compressor . If the compressor seems quieter than normal, it
is an indication of a low refrigerant charge. A check of the
To check for an undercharged system, turn the unit on, allow amperage drawn by the compressor motor should show a
the compressor to run long enough to establish working lower reading. (Check the Unit Specification.) After the unit
pressures in the system (15 to 20 minutes).
has run 10 to 15 minutes, check the gauge pressures.
During the cooling cycle you can listen carefully at the exit of Gauges connected to system with an undercharge will have
the metering device into the evaporator; an intermittent hissing low head pressures and substantially low suction pressures.
and gurgling sound indicates a low refrigerant charge.
31
NOTE: Heat pump
refrigeration
drawing
Ove rc h a rg e d Re frig e ra n t Sys te m s
Compressor amps will be near normal or higher. An over charge can cause the compressor to fail, since it would
Noncondensables can also cause these symptoms. To be "slugged" with liquid refrigerant.
confirm, remove some of the charge, if conditions improve,
system may be overcharged. If conditions don’t improve, The charge for any system is critical. When the compressor
Noncondensables are indicated.
is noisy, suspect an overcharge, when you are sure that the
air quantity over the evaporator coil is correct. Icing of the
Whenever an overcharged system is indicated, always make evaporator will not be encountered because the refrigerant
sure that the problem is not caused by air flow problems. will boil later if at all. Gauges connected to system will usually
Improper air flow over the evaporator coil may indicate some have higher head pressure (depending upon amount of
of the same symptoms as an overcharged system.
overcharge). Suction pressure should be slightly higher.
32
Re s tric te d Re frig e ra n t Sys te m
A quick check for either condition begins at the evaporator. Troubleshooting a restricted refrigerant system can be
With a partial restriction, there may be gurgling sounds at the difficult. The following procedures are the more common
metering device entrance to the evaporator. The evaporator problems and solutions to these problems. There are two
in a partial restriction could be partially frosted or have an ice types of refrigerant restrictions: Partial restrictions and
ball close to the entrance of the metering device. Frost may complete restrictions.
continue on the suction line back to the compressor.
Often a partial restriction of any type can be found by feel, as A partial restriction allows some of the refrigerant to circulate
there is a temperature difference from one side of the restriction through the system.
to the other.
With a complete restriction, there will be no sound at the With a complete restriction there is no circulation of refrigerant
metering device entrance. An amperage check of the in the system.
compressor with a partial restriction may show normal current
when compared to the unit specification. With a complete Restricted refrigerant systems display the same symptoms
restriction the current drawn may be considerably less than as a "low-charge condition."
normal, as the compressor is running in a deep vacuum (no
load.) Much of the area of the condenser will be relatively cool When the unit is shut off, the gauges may equalize very slowly.
since most or all of the liquid refrigerant will be stored there.
The following conditions are based primarily on a system in Gauges connected to a completely restricted system will run
the cooling mode.
in a deep vacuum. When the unit is shut off, the gauges will
not equalize at all.
33
Rou tin e Ma in te n a n c e
NOTE: Units are to be inspected and serviced by qualified service personnel only.
1. Clean the unit air intake filter at least every 250 to 300 fan hours of operation or when the unit's indicator light is on if so
equipped. Clean the filters with a mild detergent in warm water and allow to dry thoroughly before reinstalling.
2. The indoor coil (evaporator coil), the outdoor coil (condenser coil) and base pan should be inspected periodically (yearly
or bi-yearly) and cleaned of all debris (lint, dirt, leaves, paper, etc.). Clean the coils and base pan with a soft brush and
compressed air or vacuum. If using a pressure washer, be careful not to bend the aluminium fin pack. Use a sweeping
up and down motion in the direction of the vertical aluminum fin pack when pressure cleaning coils. Cover all electrical
components to protect them from water or spray. Allow the unit to dry thoroughly before reinstalling it in the sleeve.
NOTE: Do not use a caustic coil cleaning agent on coils or base pan. Use a biodegradable cleaning agent and
degreaser.
Inspect the indoor blower housing, evaporator blade, condenser fan blade, and condenser shroud periodically (yearly or
bi-yearly) and clean of all debris (lint, dirt, mold, fungus, etc.) Clean the blower housing area and blower wheel with an
antibacterial / antifungal cleaner. Use a biodegradable cleaning agent and degreaser on condenser fan and condenser
shroud. Use warm or cold water when rinsing these items. Allow all items to dry thoroughly before reinstalling them.
3. Periodically (at least yearly or bi-yearly): inspect all control components, both electrical and mechanical, as well as the
power supply. Use proper testing instruments (voltmeter, ohmmeter, ammeter, wattmeter, etc.) to perform electrical
tests. Use an air conditioning or refrigeration thermometer to check room, outdoor and coil operating temperatures. Use
a sling psychrometer to measure wet bulb temperatures indoors and outdoors.
4. Inspect the surrounding area (inside and outside) to ensure that the units' clearances have not been compromised or
altered.
5. Inspect the sleeve and drain system periodically (at least yearly or bi-yearly) and clean of all obstructions and debris.
Clean both areas with an antibacterial and antifungal cleaner. Rinse both items thoroughly with water and ensure that
the drain outlets are operating correctly. Check the sealant around the sleeve and reseal areas as needed.
6. Clean the front cover when needed. Use a mild detergent. Wash and rinse with warm water. Allow it to dry thoroughly
before reinstalling it in the chassis.
34
Troubleshooting Touch Test Chart: To Service Reversing Valves
NORMAL FUNCTION OF VALVE
NOTES:
VALVE
OPERATING
* TEMPERATURE OF VALVE BODY
CONDITION
** WARMER THAN VALVE BODY
1
2
3
4
5
6
POSSIBLE CAUSES CORRECTIONS
Normal
Cooling
Hot
Cool
Cool Hot *TVB
as (2) as (1)
TVB
Normal Heating
Hot
Cool
Hot Cool *TVB
as (1) as (2)
TVB
MALFUNCTION OF VALVE
No voltage to coil.
Repair electrical circuit.
Replace coil.
Check Electrical circuit and coil
Defective coil.
Valve will
not shift
from cool to
heat.
Low charge.
Repair leak, recharge system.
Recheck system.
Check refrigeration charge
Pressure differential too high.
Pilot valve okay. Dirt in one
bleeder hole.
*TVB
Hot
Deenergize solenoid, raise head pressure,
reenergize solenoid to break dirt loose. If
unsuccessful, remove valve, wash out. Check
on air before installing. If no movement, replace
valve, add strainer to discharge tube, mount
valve horizontally.
Hot
Cool
Cool, Hot,
as (1)
as (2)
Piston cup leak
Stop unit. After pressures equalize, restart with
solenoid energized. If valve shifts, reattempt
with compressor running. If still no shift, replace
valve.
Hot,
as (1)
Hot,
Hot
Hot
Cool
Cool
Cool,
as (2)
Cool,
as (2)
Clogged pilot tubes.
Raise head pressure, operate solenoid to free.
If still no shift, replace valve.
Raise head pressure, operate solenoid to free
partially clogged port. If still no shift, replace
valve.
*TVB
Hot
*TVB
Hot
Valve will
not shift
from cool to
heat.
Both ports of pilot open. (Back seat
port did not close).
as (1)
Warm,
as (1)
Hot
Warm
Hot
Cool
Cool,
as (2)
Defective Compressor.
Replace compressor
*TVB
*TVB
Warm
Hot
Warm Warm
Not enough pressure differential at
start of stroke or not enough flow to
maintain pressure differential.
Body damage.
Check unit for correct operating pressures and
charge. Raise head pressure. If no shift, use
valve with smaller port.
Replace valve
Raise head pressure, operate solenoid. If no
shift, replace valve.
Starts to
shift but
does not
complete
reversal.
Hot
Hot
Hot
Hot
Warm Warm
Both ports of pilot open.
Hot
Hot
Hot
Hot
Hot
Body damage.
Replace valve
*TVB
Valve hung up at mid-stroke. Pumping Raise head pressure, operate solenoid. If no
volume of compressor not sufficient to shift, use valve with smaller ports.
maintain reversal.
Hot
Hot
Hot
Hot
Hot
Hot
Hot,
Both ports of pilot open.
Raise head pressure, operate solenoid. If no
shift, replace valve.
Operate valve several times, then recheck. If
excessive leak, replace valve.
Hot
Hot
Cool,
as (2)
Cool,
as (2)
Cool,
as (2)
Cool
Cool
Cool
Hot,
as (1)
Hot,
as (1)
Hot,
Piston needle on end of slide leaking.
*TVB
*TVB
Apparent
leap in
heating.
Pilot needle and piston needle leaking. Operate valve several times, then recheck. If
excessive leak, replace valve.
Pressure differential too high.
**
WVB
*TVB
**
WVB
*TVB
Stop unit. Will reverse during equalization
period. Recheck system
as (1)
Clogged pilot tube.
Raise head pressure, operate solenoid to free
dirt. If still no shift, replace valve.
Cool,
as (2)
Hot
Hot
Cool
Cool
Hot,
as (1)
Dirt in bleeder hole.
Raise head pressure, operate solenoid.
Remove valve and wash out. Check on air
before reinstalling, if no movement, replace
valve. Add strainer to discharge tube. Mount
valve horizontally.
Stop unit. After pressures equalize, restart with
solenoid deenergized. If valve shifts, reattempt
with compressor running. If it still will not reverse
while running, replace the valve.
Hot
Hot
*TVB
*TVB
Will not shift
from heat to
cool.
Cool,
as (2)
Hot,
as (1)
Piston cup leak.
Cool,
as (2)
Cool,
as (2)
Hot
Cool
Cool
Hot,
as (1)
Warm,
as (1)
Defective pilot.
Replace valve.
Hot
Hot
Warm
Defective compressor.
Replace compressor
Warm
*TVB
35
Troubleshooting: Cooling
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Low voltage.
Check for voltage at compressor. 115 volt and 230
volt units will operate at 10% voltage variance
Set thermostat to coldest position. Test thermostat
and replace if inoperative.
Thermostat not set cold enough or
inoperative.
Compressor does not
run.
Compressor hums but cuts off on
overload.
Open or shorted compressor
windings.
Hard start compressor. Direct test compressor. If
compressor starts, add starting components.
Check for continuity and resistance.
Open overload.
Open capacitor.
Inoperative system switch.
Test overload protector and replace if inoperative.
Test capacitor and replace if inoperative.
Test for continuity in all positions. Replace if
inoperative.
Broken, loose or incorrect wiring.
Refer to appropriate wiring diagram to check wiring.
PROBLEM
TO CORRECT
POSSIBLE CAUSE
Inoperative system switch.
Broken, loose or incorrect wiring.
Open Capacitor.
Fan speed switch open.
Inoperative fan motor.
Test switch and replace in inoperative.
Refer to applicable wiring diagram.
Test capacitor and replace if inoperative.
Test switch and replace if inoperative.
Test fan motor and replace if inoperative. (Be
sure internal overload has had time to reset.)
Fan motor
does not run.
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Undersized unit.
Refer to Sizing Charts.
Thermostat open or inoperative.
Set to coldest position. Test thermostat and
replace if necessary.
Dirty filter.
Dirty or plugged condenser or
evaporator coil.
Clean as recommended in Owner’s Manual.
Use steam or detergents to clean.
Does not cool, or cools
only slightly.
Poor air circulation in area being
cooled.
Adjust discharge air louvers. Use high fan
speed.
Fresh air or exhaust air door open
on applicable models.
Low capacity – undercharge.
Compressor not pumping properly.
Close doors. Instruct customer on use of this
feature.
Check for leak and make repair.
Check amperage draw against nameplate. If
not conclusive, make pressure test.
PROBLEM
TO CORRECT
Replace fuse, reset breaker. If repeats, check fuse
or breaker size. Check for shorts in unit wiring and
components.
Plug in power cord
Set switch correctly.
Test for continuity in each switch position.
Check wiring and connections. Reconnect per wiring
diagram.
Fuse blown or circuit tripped.
Unit does not run.
Power cord not plugged in.
System switch in "Off" position.
Inoperative system switch.
Loose or disconnected wiring at switch or
other components.
36
PROBLEM
TO CORRECT
POSSIBLE CAUSE
Dirty filter.
Restricted air flow.
Clean as recommended in Owner’s Manual.
Check for dirty or obstructed coil - clean as re-
quired.
Test for shorted thermostat or stuck contacts.
De-ice coil and check for leak.
Evaporator coil
freezes up.
Inoperative thermostat.
Short of refrigerant.
Inoperative fan motor.
Partially restricted capillary.
Test fan motor and replace if inoperative.
De-ice coil. Check temperature differential across
coil. Touch test coil return bends for same tempera-
ture. Test for low running current.
PROBLEM
POSSIBLE CAUSE
TO CORRECT:
Excessive heat load.
Unit undersized. Test cooling performance of unit.
Replace with larger unit.
Compressor runs
continually.
Restriction in line.
Refrigerant leak.
Check for partially iced coil. Check temperature split
across coil.
Check for oil at silver soldered connections. Check
for partially iced coil. Check split across coil. Check
for low running amperage.
Does not cycle off.
Thermostat contacts stuck
Thermostat incorrectly wired.
POSSIBLE CAUSE
Check operation of thermostat. Replace if contacts
remain closed.
Refer to appropriate wiring diagram.
PROBLEM
TO CORRECT:
Thermostat contacts stuck.
Replace thermostat.
Thermostat set at coldest point.
Turn to higher temperature setting to see if the unit
cycles off.
Thermostat does not
turn unit off.
Incorrect wiring.
Unit undersized for area to be cooled.
Refer to appropriate wiring diagram.
Refer to Sizing Chart.
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Overload inoperative. Opens too soon.
Check operation of unit. Replace overload if
system operation is satisfactory.
Compressor attempts to start before
system pressures are equalized.
Allow a minimum of two (2) minutes for pressures
to equalize before attempting to restart. Instruct
customer of waiting period.
Low or fluctuating voltage.
Check voltage with unit operating. Check for other
appliances on circuit. Air conditioner should be on
separate circuit for proper voltage, and be fused
separately.
Refer to appropriate wiring diagram.
Check by substituting a known good capacitor of
correct rating.
Compressor attempts
to start, or runs for
short periods only.
Cycles on overload.
Incorrect wiring.
Shorted or incorrect capacitor.
Restricted or low air flow through
condenser coil.
Compressor running abnormally hot.
Check for proper fan speed or blocked condenser.
Check for kinked discharge line or restricted condenser.
Check amperage.
PROBLEM
TO CORRECT
POSSIBLE CAUSE
Loss of charge in thermostat bulb.
Place jumper across thermostat terminals to check
if unit operates. If unit operates, replace thermostat.
Thermostat does not
turn unit on.
Loose or broken parts in thermostat.
Incorrect wiring.
Check as above.
Refer to appropriate wiring diagram.
37
TO CORRECT
PROBLEM
POSSIBLE CAUSE
Poorly installed unit.
Refer to Installation Instructions for proper
installation.
Fan blade striking chassis.
Compressor vibrating.
Reposition - adjust motor mount.
Check that compressor grommets have not
deteriorated. Check that compressor mounting
parts are not missing, and that shipping blocks
have been removed.
Noisy operation.
Improperly mounted or loose cabinet
parts.
Check assembly and parts for looseness,
rubbing and rattling.
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Evaporator drain pan overflowing.
Clean obstructed drain trough.
Condensation forming on base pan.
Evaporator drain pan broken or cracked. Reseal or
replace.
Water leaks into room.
Poor installation resulting in rain
entering room.
Check Installation Instructions. Reseal as required.
Condensation on discharge grilles.
Dirty evaporator coil - clean.
Very high humidity level.
POSSIBLE CAUSE
TO CORRECT
Replace thermostat.
Check gasket. Reposition or replace.
PROBLEM
Thermostat differential too narrow.
Plenum gasket not sealing, allowing
discharge air to short cycle thermostat.
Restricted coil or dirty filter.
Thermostat short
cycles.
Clean and advise customer of periodic cleaning of
filter.
Replace tubular insulation on bulb.
(Applicable models.)
Tubular insulation missing from top of
thermostat bulb.
Adjust bulb bracket.
(Applicable models.)
Thermostat bulb touching thermostat
bulb support bracket.
POSSIBLE CAUSE
PROBLEM
TO CORRECT
Anticipator (resistor) wire disconnected Refer to appropriate wiring diagram.
at thermostat or system switch.
Anticipator (resister shorted or open).
(Applicable models.)
Disconnect plug from outlet. Remove resistor from
bracket. Insert plug and depress "Cool" and "Fan -
Auto (MoneySaver)” buttons. Place thermostat to
warmest setting. Feel resistor for temperature.
If no heat, replace resistor.
Prolonged off-cycles.
(automatic operation)
Partial loss of charge in thermostat
bulb causing a wide differential.
Replace thermostat.
TO CORRECT
Change room thermostat.
POSSIBLE CAUSE
Thermostat sticking.
PROBLEM
Switches from
Incorrect wiring.
Refer to appropriate wiring diagram.
cooling to heating.
38
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Evaporator drain pan cracked or
obstructed.
Water in compressor area.
Repair, clean or replace as required.
Outside water leaks.
Detach shroud from pan and coil. Clean and
remove old sealer. Reseal, reinstall and check.
Steam clean.
Adjust fan blade to 1/2" clearance from condenser
coil.
Obstructed condenser coil.
Fan blade and slinger ring improperly
positioned.
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Insufficient air circulation in air condi-
tioned area.
Oversized unit.
Adjust louvers for best possible air circulation
High indoor
humidity.
Operate in "Fan-Auto (MoneySaver)" position.
Advise customer.
Inadequate vapor barrier in building
structure, particularly floors.
39
Troubleshooting: Heating (Heat pumps)
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Thermostat setting.
Defective thermostat.
Compressor not operating.
Set thermostat to a warmer position.
Replace — do not attempt to adjust.
Check compressor wiring. Check for open internal
or external overload. Check wiring.
Test system switch
No heating — fan
operates.
Defective system switch.
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Restricted filter.
Outdoor thermostat.
(Applicable models.)
Clean as recommended in Owner’s Manual.
Check if outdoor thermostat is energizing the heating
element at its predetermined temperature setting
Check control setting.
Insufficient heating.
Fresh air or exhaust door open.
POSSIBLE CAUSE
TO CORRECT
PROBLEM
Inoperative system switch.
Check continuity of switch.
Fan operates in
"constant" position, but
not in "automatic"
(MoneySaver).
Incorrect wiring.
Check applicable wiring diagram.
TO CORRECT
PROBLEM
POSSIBLE CAUSE
Incorrect differential setting. Replace thermostat.
Check voltage to resistor. If voltage okay, remove
resistor from thermostat bulb block. With current on,
feel resistor for warmth. If no heat can be felt,
replace anticipator.
Defective thermostat.
Heat anticipator (resistor) shorted.
(Applicable models)
Temperature varies from
comfortable to overly
warm.
POSSIBLE CAUSE
PROBLEM
TO CORRECT
Heat anticipator (resistor) shorted.
(Applicable models.)
Disconnect power to unit. Remove resistor from
thermostat bulb block. Plug in unit and allow to
operate. Feel resistor for heat. If no heat is felt,
replace resistor.
Room temperature
uneven.
(Heating cycle)
Wide differential — partial loss of ther-
mostat bulb charge.
Replace thermostat and check.
Incorrect wiring.
Refer to appropriate wiring diagram. Resistor is
energized during the "on" cycle of compressor or
fan.
POSSIBLE CAUSE
Incorrect wiring.
Defrost control timer motor not advanc-
ing.
TO CORRECT
PROBLEM
Refer to appropriate wiring diagram.
Check for voltage at "TM" and "TM1" on timer. If
voltage, replace control.
If outside coil temperature is 25° F or below, and
preselected time limit has elapsed, replace the
defrost control.
If the contacts remain closed between terminals "2"
and "3" of the defrost control after preselected time
interval has passed, replace control.
Reinstall and assure that good bulb to coil contact is
made.
Unit will not defrost.
Defrost control out of calibration.
Defrost control contacts stuck.
Defrost control bulb removed from coil,
or not making good coil contact.
40
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Outdoor thermostat does not cut off
compressor at the preselected tem-
perature and bring on heating element.
Fresh air or exhaust door open.
Defective thermostat - replace.
Unit does not heat
adequately.
Check if operating properly. Instruct customer
on proper use of control.
Dirty filter.
Unit undersized.
Clean as recommended in Owner’s Manual.
Check heat rise across coil. Refer to perfor-
mance data sheet on heat rise at various
outdoor ambients. If heat rise is satisfactory,
check if insulation can be added to attic or
walls.
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Incorrect wiring.
Defective solenoid coil.
Reversing valve fails to shift.
Refer to applicable wiring diagram.
Check for continuity of coil.
Block condenser coil and switch unit to cooling.
Allow pressure to build up in system, then
switch to heating. If valve fails to shift, replace
valve.
Unit cools when
heat is called for.
Inoperative system switch.
Check for continuity of system switch.
PROBLEM
TO CORRECT
POSSIBLE CAUSE
Outdoor thermostat does not cut off
compressor at the preselected tempera-
ture and bring on the heating element.
Defective thermostat — replace.
Unit does not heat
adequately.
Fresh air or exhaust door open.
Check if operating properly. Instruct customer on
proper use of control.
Dirty filter.
Unit undersized.
Clean as recommended in Owner’s Manual
Check heat rise across coil. Refer to performance
data sheet on heat rise at various outdoor ambients. If
heat rise is satisfactory, check if insulation can be
added to attic or walls.
TO CORRECT
PROBLEM
POSSIBLE CAUSE
Incorrect wiring.
Defective solenoid coil.
Reversing valve fails to shift.
Refer to applicable wiring diagram.
Check for continuity of coil.
Block condenser coil and switch unit to cooling. Allow
pressure to build up in the system, then switch to
heating. If valve fails to shift, replace valve.
Check for continuity of system switch.
Unit cools when
heat is called for.
Inoperative system switch.
POSSIBLE CAUSE
PROBLEM
TO CORRECT
Heating capillary tube partially
restricted.
Check valve leaking internally.
Check for partially starved outer coil. Replace heating
capillary tube.
Switch unit several times from heating to cooling.
Check temperature rise across the coil. Refer to
specification sheet for correct temperature rise.
Deenergize solenoid coil, raise head pressure, ener-
gize solenoid to break loose. If valve fails to make
complete shift, replace valve.
Cooling is ad-
equate, but heating
is insufficient.
Reversing valve failing to shift
completely — bypassing hot gas.
41
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Refer to the heating data on applicable models for
the preselected temperature the compressor shuts
off and the electric element is energized.
Outdoor thermostat.
(Applicable models.)
Compressor will not turn
off and operate on heating
element only during low
outside ambients.
TO CORRECT
PROBLEM
POSSIBLE CAUSE
Fuse link.
Check fuse link for continuity. If defective, replace.
Compressor shuts off on
outdoor thermostat but
element does not heat.
Heating element shorted.
Incorrect wiring.
Check amperage draw of element. If no amperage,
replace.
Check voltage to element. If voltage is okay, check
wiring.
42
Troubleshooting: Heating (Cooling/Electric Models)
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Heater relay or contactor coil open.
Heater relay or contactor stuck open,
pitted or burned.
High limit control open.
Open thermal fuse.
Check continuity of coil.
Inspect, test continuity with ohmmeter.
Fan Operates –
heating element does
not come on.
Check continuity – if open, replace.
Check continuity. Check reason for failure.
Check voltage across heater terminals. Check
amperage draw of heater.
Open or shorted element.
Loose connections.
Tighten all terminals.
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Clean as recommended in Owner’s Manual.
Control is set to open at 155°F ± 5°F and close at
130°F ± 8°F. If cycling prematurely, replace control.
Restricted filter.
Cycling high limit control.
Heating inadequate.
Check position of fresh air door control slide. Adjust
cable if door does not close properly.
Exhaust or fresh air door open.
TO CORRECT
POSSIBLE CAUSE
PROBLEM
Fan relay contacts open.
Check continuity of fan relay. NOTE: Some models
have the fan relay energized during the heating
cycle while others do not.
Fan operates in "Con-
stant" position, but not in
"Automatic" (Money-
Saver).
Inoperative system switch.
Loose connection.
Check continuity between terminals "L2" and "3" of
the system switch.
Check connections on system switch and fan relay.
PROBLEM
TO CORRECT
POSSIBLE CAUSE
Heat anticipator (resistor) shorted.
Disconnect power to unit. Remove resistor from
thermostat bulb block. Plug in unit and allow to
operate. Feel resistor for heat. If no heat is felt,
replace resistor.
Long "off" and "on"
cycles.
Defective thermostat.
Replace thermostat and check operation.
TO CORRECT
POSSIBLE CAUSE
PROBLEM
Defective motor.
Check and replace.
Replace capacitor and check.
Check if drain pan valve is open. If not, replace.
Check all connections. Check voltage to fan motor.
Fan motor does not
operate in "Constant"
or "MoneySaver"
position.
Open or shorted capacitor.
Condenser fan frozen to base pan.
Loose connections.
PROBLEM
POSSIBLE CAUSE
TO CORRECT
Check for partially starved outer coil. Replace
heating capillary tube.
Heating capillary tube partially restricted.
Switch unit several times from heating to cooling.
Check temperature rise across coil. Refer to specifi-
cation sheet for correct temperature rise.
Deenergize solenoid coil, raise head pressure,
energize solenoid to break loose. If valve fails to
make complete shift, replace valve.
Check valve leaking internally.
Cooling adequate,
heating insufficient.
Reversing valve failing to shift
completely – bypassing hot gas.
43
POSSIBLE CAUSE
TO CORRECT
PROBLEM
Outdoor thermostat.
(Applicable models.)
Refer to the heating data on applicable models for
the preselected temperature the compressor shuts
off and the electric element is energized.
Compressor will not
turn off and operate on
heating element only
during low outside
ambients.
Trou b le s h ootin g Ch a rt — Coolin g
REFRIGERANT S YS TEM
DIAGNOS IS COOLING
Low Suction Pressure
Low Load Conditions
High Suction Pressure
High Load Conditions
Low Head Pressure
Low Load Conditions
High Head Pressure
High Load Conditions
Low Air Flow Across
Indoor Coil
High Air Flow Across
Indoor Coil
Refrigerant System
Restriction
Low Air Flow Across
Outdoor Coil
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Reversing Valve not
Fully Seated
Overcharged
Undercharged
Overcharged
Undercharged
in System
Noncondensables (air)
Moisture in System
Defective Compressor
Defective Compressor
44
Trou b le s h ootin g Ch a rt — He a tin g
REFRIGERANT S YS TEM
DIAGNOS IS – HEATING
High Head Pressure
Low Suction Pressure
High Suction Pressure
Low Head Pressure
Outdoor Ambient Too High
for Operation in Heating
Outdoor Ambient Too High
For Operation In Heating
Low Airflow
Across Outdoor Coil
Refrigerant System
Restriction
Low Airflow Across
Indoor Coil
Refrigerant System
Restriction
Reversing Valve not
Fully Seated
Reversing Valve not
Fully Seated
Undercharged
Overcharged
Overcharged
Undercharged
Noncondensables (air) in
System
Defective Compressor
Defective Compressor
Moisture in System
Ele c tric a l Trou b le s h ootin g Ch a rt
(He a t P u m p )
HEAT P UMP
SYSTEM COOLS WHEN
HEATING IS DESIRED.
Is the Selector Switch
Is Line Voltage
Present at the Solenoid
YES
Set for Heat?
NO
NO
Is the Solenoid Coil Good?
Replace the Solenoid Coil
YES
Reversing Valve Stuck
Replace the Reversing Valve
45
MODELS
RS10J10C, RS12J10A-B, RS15J10A, RS16J30A-A, RS18J30A, RM24J30-A
COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REFER TO
MARKINGS ON
COMPRESSOR
WIRING DIAGRAM
COMPRESSOR
R
BLUE
RED
RED
BLACK
PURPLE
SWITCH
SYSTEM
OVERLOAD
PROTECTOR
ALTERNATE
COMPRESSOR
2
M S
BLUE
C
L O
L L
L 1
COMPRESSOR
WIRE HARNESS
M
H
SWITCH,
ROCKER (GE)
ANTICIPATOR
RESISTOR
THERMOSTAT
BLACK
BLACK
CAPACITOR
RED
c
WHITE
BLACK
BLUE
ORANGE
RED
BROWN
TO CAPACITOR
BRACKET
BLUE
SUPPLY CORD
TO CHASSIS
OR GREEN/YELLOW
FAN
MOTOR
TO INNERWALL/
MOTOR MOUNT
TO CAPACITOR
BRACKET
SCHEMATIC
L2
L1
AR
IDT
R
OVLD
1
2
2
1
L1
C
COMPR
S
C
HERM
C
CAP
2
HIGH
MS
H
3
3
YES
R
OVLD
2
MEDIUM
LOW
MS
M
L
MTR
S
4
5
6
FAN
CAP
C
N0
1
LL
SYS SW
X = CLOSED
0 = OPEN
SWITCH LOGIC
SWITCH POSITION
L E G E N D
- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
AR
MS
CIRCUIT
1
2
3
4
5
6
CAP
- CAPACITOR
O
X
X
X
O
X
O
O
O
O
X
O
O
O
O
X
O
O
O
O
X
O
O
O
O
X
O
O
O
O
O
O
O
O
O
X
OFF
COMPR
- COMPRESSOR
- GROUND LEAD
- COMBINATION TERMINAL
LOW COOL
MED COOL
HI COOL
FAN ONLY
LL COOL
MTR
- FAN MOTOR
OVLD
SYS SW
IDT
- OVERLOAD PROTECTOR
- SYSTEM SWITCH
- PLASTIC INSULATOR
- INDOOR THERMOSTAT
PART NO.
619-405-00
REV
00
46
MODELS
SQ06J10B-B, SQ06J10B-A, SQ08J10C-A, SQ08J10D-A
WIRING DIAGRAM
RED
PURPLE
COMPRESSOR
C
BLUE
2
BLUE
M S
"F"
C
"F"
"F"
M
L
H
L 1
SWITCH
SYSTEM
BROWN
C
SWITCH
ROCKER (GE)
HARNESS, COMPR.
1
3
NOTE:
OPTIONAL
2
ANTICIPATOR
RESISTOR
CONFIGURATION
SUPPLY CORD
THERMOSTAT
BLACK
WHITE
CAPACITOR
RED
C
RED
TO CAPACITOR
BRACKET
BLUE
BLACK
BLUE
BROWN
TO INNERWALL/
MOTOR MOUNT
FAN
MOTOR
SCHEMATIC
L2
L1
AR
IDT
R
OVLD
1
2
1
COMPR
S
L1
C
C
HERM
C
CAP
2
3
2
HIGH
MS
H
3
NO
R
OVLD
2
MEDIUM
LOW
MS
M
L
MTR
S
4
5
FAN
C
YES
1
CAP
SYS SW
X = CLOSED
0 = OPEN
SWITCH LOGIC
SWITCH POSITION
L E G E N D
- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
AR
MS
CIRCUIT
CAP
COMPR
- CAPACITOR
- COMPRESSOR
1
2
3
4
5
- GROUND LEAD
- COMBINATION TERMINAL
O
X
X
X
O
O
O
O
O
X
O
O
O
X
O
O
O
X
O
O
O
X
O
O
O
OFF
MTR
- FAN MOTOR
LOW COOL
MED COOL
HI COOL
FAN ONLY
OVLD
SYS SW
IDT
- OVERLOAD PROTECTOR
- SYSTEM SWITCH
- PLASTIC INSULATOR
- INDOOR THERMOSTAT
PART NO.
619-142-15
REV.
01
47
MODELS
KQ05J10B-B, KQ05E10-C KQ06J10B-A, KQ06J10B-B, KQ06E10-A, KQ06E10-B
WIRING DIAGRAM
PTCR
CAPACITOR
(OPTIONAL)
RED
FAN MOTOR
BLACK
WHITE
WIRE HARNESS
BROWN
RED
BLACK
HERM
BLACK
BLACK
BLUE
RED
S
C R
THERMOSTAT
BLACK
BLACK
2
L
C
H
COMPRESSOR
SYSTEM SWITCH
1
GREEN/YELLOW
L1
SMOOTH (OR BROWN) CONDUCTOR
TO GND
SEE DETAIL " A "
SCREW
SUPPLY CORD
DETAIL " A " OPTIONAL WIRING
RED
BLACK
SYSTEM SWITCH SEQUENCE
ANTI-ICE
CONTROL
BLK
BLK
2
L
C
H
BLK
CW ROT
OFF
CONNECTION
ALL OPEN
1
SYSTEM SWITCH
L1
WHITE
THERMOSTAT
HI FAN
LO FAN
LO COOL
HI COOL
L1-H
L1-L
L1-L,L1-C
L1-H,L1-C
DETAIL " B " OPTIONAL SCHEMATIC
SCHEMATIC
ANTI-ICE
CONTROL
T\STAT
L
H
C
RED
BLACK
LINE
L1
H
SYSTEM SWITCH
L
C
RED
T/STAT
OLVD
SEE DETAIL "B"
BLACK
FAN MOTOR
CAPACITOR
C
BROWN
C
R
F
H
S
PTCR (OPTIONAL)
COMPRESSOR
WHITE
LINE
RIBBED CONDUCTOR
PART NO.
619-046-01
REV.
01
LEGEND:
= OPTIONAL FACTORY WIRING
PTCR = START ASSIST DEVICE
48
MODELS
KQ08J10B-1, KQ08J10B-A, KQ08J10C-A
WIRING DIAGRAM
WIRE HARNESS
R S
C
CAPACITOR
PTCR
(OPTIONAL)
RED
BLACK
04
1
FAN MOTOR
WHITE
R
C S
BROWN
RED
BLUE
BLUE
NOTE:
BLACK
HERM
BLACK
OPTIONAL
CONFIGURATION
BLACK
RED
THERMOSTAT
BLK
2
L
C
H
BLACK
1
GREEN
L1
SYSTEM SWITCH
BROWN
BROWN
TO GND
SCREW
SEE DETAIL " A "
SUPPLY CORD
DETAIL " A " OPTIONAL WIRING
RED
04
BLACK
SYSTEM SWITCH SEQUENCE
ANTI-ICE
BLK
CONTROL
2
L
C
H
BLK OR
BLK OR
CW ROT
OFF
CONNECTION
ALL OPEN
1
SYSTEM SWITCH
RED
RED
L1
BROWN
THERMOSTAT
HI FAN
LO FAN
LO COOL
HI COOL
L1-H
L1-L
L1-L,L1-C
L1-H,L1-C
DETAIL " B " OPTIONAL SCHEMATIC
ANTI-ICE
SCHEMATIC
CONTROL
T/STAT
L
H
C
RED
BLACK
LINE
SYSTEM SWITCH
L1
L
H
C
RED
T\STAT
OLVD
SEE DETAIL "B"
BLACK
FAN MOTOR
CAPACITOR
C
BRN
F
C
R
H
S
PTCR (OPTIONAL)
COMPRESSOR
WHITE
LINE
BLUE
PART NO.
617-581-04
REV.
04
LEGEND:
= OPTIONAL FACTORY WIRING
PTCR = START ASSIST DEVICE
49
MODELS
XQ05J10-B, XQ06J10-A, XQ06J10-B, XQ08J10-1, XQ08J10-A, XQ08J10A-A
COMPRESSOR
ELECTRONIC
CONTR
OL
TERMINAL
ORIENTATION
MAY VARY.
WIRING DIAGRAM
COMPRESSOR
REFER TO
MARKINGS ON
COMPRESSOR
TRANSFORMER
RELAY
RELAY
BLACK
BLUE
OVERLOAD
PROTECTOR
COM
NO
RELAY
RED
COMPRESSOR
WIRE HARNESS
SUPPLY CORD
BLACK
WHITE
WHITE
CAPACITOR
c
RED
BLUE
BLACK
BROWN
TO CAPACITOR
BRACKET
RED
MOTOR WIRE
HARNESS
BLUE
TO CAPACITOR
BRACKET
GREEN OR
GREEN/YELLOW
FAN
MOTOR
TO INNERWALL/
MOTOR MOUNT
TO CHASSIS
SCHEMATIC
L1
NEUTRAL
(115 V)
HIGH
1
2
3
R
MEDIUM
LOW
OVLD
MTR
FAN
CAP
C
S
S
OVLD
NO
COM
COMPR
R
5
HERM
CAP
C
C
ELECTRONIC CONTROL
X = CLOSED
O = OPEN
L E G E N D
SWITCH LOGIC
SWITCH POSITION
CIRCUIT
CAP
COMPR
- CAPACITOR
- COMPRESSOR
1
2
3
4
5
O
X
O
O
O
O
X
O
O
O
O
X
O
O
O
O
O
X
X
X
- COMBINATION TERMINAL
- GROUND LEAD
OFF
MTR
- FAN MOTOR
HI COOL
MED COOL
LOW COOL
OVLD
- OVERLOAD PROTECTOR
PART NO.
619-142-14
REV.
03
50
MODEL
YQ06J10B-A
BLACK
RED
WIRING DIAGRAM
PTCR
(OPTIONAL)
BLUE
BLACK
CAPACITOR
RED
RED
(HARNESS, COMPR. MOLDED)
RIBBED (OR BLUE) CONDUCTOR
WHITE
BROWN
RED
BLACK
BLUE
HERM
R
C
DEFROST CONTROL
SOLENOID
BLACK
BLUE
WHITE
RED
2
1
FAN MOTOR
COMPRESSOR
RED
BLACK
BLACK
BLACK
2
3
1
2
3
SYSTEM SWITCH
WHITE
4
1
THERMOSTAT
GREEN
C
SMOOTH (OR BROWN) CONDUCTOR
BLUE
TO GND
SCREW
SUPPLY CORD
SCHEMATIC
LINE
C
SYSTEM
SWITCH
3
1
THERMOSTAT
1
3
4
2
LOW
HIGH
COMPRESSOR
C
2
S
SOLENOID
FAN OVERLOAD
FAN MOTOR
C' OVLD.
2
1
1
DEFROST CONTROL T/STAT.
C
H
F
PTCR (OPTIONAL)
RUN CAPACITOR
LINE
X = CLOSED
O = OPEN
SWITCH LOGIC
SWITCH POSITION
L E G E N D
CIRCUIT
1
2
3
4
5
O
X
X
O
O
X
O
O
O
O
O
X
O
O
O
O
O
O
O
O
OFF
HI-FAN
O
O
X
X
HI-COOL
LO-COOL
LO-HEAT
HI-HEAT
- OPTIONAL FACTORY WIRING
CAP
COMPR
- CAPACITOR
- COMPRESSOR
X
X
X
O
O
- GROUND LEAD
- COMBINATION TERMINAL
MTR
- FAN MOTOR
O
OVLD
SYS SW
IDT
- OVERLOAD PROTECTOR
- SYSTEM SWITCH
- PLASTIC INSULATOR
- INDOOR THERMOSTAT
- START ASSIST DEVICE
PART NO.
617-581-11
REV.
00
PTCR
51
MODEL: SC06H10D
52
MODELS
SS08J10R-B, SS08J10R-A, SS09J10C-A, SS10J10AR-A,
SS12J10AR-B, SS14J10R-A, SS12J30D-A, SS16J30A-A,
SS18J30R-A, SM20J30-A, SM24J30-A
COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
WIRING DIAGRAM
COMPRESSOR
R
REFER TO
MARKINGS ON
COMPRESSOR
WHITE
TRANSFORMER
RED
BLACK
OVERLOAD
PROTECTOR
ALTERNATE
COMPRESSOR
NO
COM
BLACK
BLUE
RELAY
COMPRESSOR
WIRE HARNESS
RELAY
SUPPLY CORD
ORANGE
RED
ROOM
RELAY
RELAY
SENSOR
DEFROST
SENSOR
ELECTR
ONIC CONTRO
L
WHITE
WHITE
BROWN
CAPACITOR
RED
c
ORANGE
TO CAPACITOR
BRACKET
BLUE
RED
BLACK
BLUE
TO CAPACITOR
BRACKET
GREEN OR
GREEN/YELLOW
FAN
MOTOR
TO INNERWALL/
MOTOR MOUNT
TO CHASSIS
NEUTRAL
L2
(115 V)
SCHEMATIC
L1
(230/208)
HIGH
F4
F3
F2
F1
R
S
MEDIUM
LOW
OVLD
MTR
FAN
CAP
C
SLEEP
L1
R
OVLD
NO
COM
C
COMPR
5
HERM
CAP
C
S
ELECTRONIC CONTROL
X = CLOSED
O = OPEN
L E G E N D
SWITCH LOGIC
SWITCH POSITION
CIRCUIT
CAP
COMPR
- CAPACITOR
- COMPRESSOR
1
2
3
4
5
O
X
O
O
O
O
O
X
O
O
O
O
O
X
O
O
O
O
O
X
O
X
X
X
X
- COMBINATION TERMINAL
- GROUND LEAD
OFF
HI COOL
MTR
- FAN MOTOR
OVLD
- OVERLOAD PROTECTOR
MED COOL
LOW COOL
SLEEP
PART NO.
619-405-06
REV.
01
53
MODELS
SL28J30B-A, SL35J30-A, SL35J30-B
WIRING DIAGRAM
COMPRESSOR TERMINAL
ORIENTATION MAY VARY. REFER
COMPRESSOR
TO MARKING ON COMPRESSOR.
RED
"F"
"F"
"F"
RED
PURPLE
BLACK
SYSTEM SWITCH
BLUE
ALTERNATE
COMPRESSOR
C
BLUE
L
2
M S
OVERLOAD
PROTECTOR
L
M
1
H
BROWN
HARNESS,
COMPRESSOR
MOLDED
ROCKER SWITCH (GE)
ANTICIPATOR
RESISTOR
BLACK OR WHITE
BLACK
CAPACITOR
THERMOSTAT
ORANGE
BLUE
RED
c
WHITE
BROWN
SUPPLY CORD
BLUE
BLACK
TO CAPACITOR
BRACKET
TO CHASSIS
GREEN OR
GREEN/YELLOW
TO CAPACITOR
BRACKET
FAN
MOTOR
TO INNERWALL/
MOTOR MOUNT
BLUE
SCHEMATIC
L2
L1
AR
IDT
R
OVLD
1
2
1
COMPR
S
L1
C
C
HERM
C
CAP
2
2
HIGH
MS
H
3
1
NO
R
OVLD
2
MEDIUM
LOW
MS
M
MTR
S
4
FAN
CAP
C
YES
3
L
5
SYS SW
X = CLOSED
0 = OPEN
SWITCH LOGIC
SWITCH POSITION
L E G E N D
- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
AR
MS
CIRCUIT
CAP
COMPR
- CAPACITOR
- COMPRESSOR
1
2
3
4
5
- GROUND LEAD
- COMBINATION TERMINAL
O
X
X
X
O
O
O
O
O
X
O
O
O
X
O
O
O
X
O
O
O
X
O
O
O
OFF
MTR
- FAN MOTOR
LOW COOL
MED COOL
HI COOL
FAN ONLY
OVLD
SYS SW
IDT
- OVERLOAD PROTECTOR
- SYSTEM SWITCH
- PLASTIC INSULATOR
- INDOOR THERMOSTAT
PART NO.
619-405-01
REV.
00
54
MODELS
KS10E10-A, KS10J10-B, KS12E10-A, KS12J10B-A, KS15J10-A,
KS12J30B-A, KS18J30-A, KM20J30-A, KM24J30-A
WIRING DIAGRAM
COMPRESSOR TERMINAL
ORIENTATION MAY VARY. REFER
COMPRESSOR
TO MARKING ON COMPRESSOR.
RED
"F"
"F"
"F"
RED
PURPLE
BLACK
SYSTEM SWITCH
BLUE
ALTERNATE
COMPRESSOR
C
BLUE
L
2
M S
OVERLOAD
PROTECTOR
L
M
1
H
BROWN
HARNESS,
COMPRESSOR
MOLDED
ROCKER SWITCH (GE)
ANTICIPATOR
RESISTOR
BLACK OR WHITE
BLACK
CAPACITOR
THERMOSTAT
ORANGE
BLUE
RED
c
WHITE
BROWN
SUPPLY CORD
BLUE
BLACK
TO CAPACITOR
BRACKET
TO CHASSIS
GREEN OR
GREEN/YELLOW
TO CAPACITOR
BRACKET
FAN
MOTOR
TO INNERWALL/
MOTOR MOUNT
BLUE
SCHEMATIC
L2
L1
AR
IDT
R
OVLD
1
2
1
COMPR
S
L1
C
C
HERM
C
CAP
2
2
HIGH
MS
H
3
1
NO
R
OVLD
2
MEDIUM
LOW
MS
M
MTR
S
4
FAN
CAP
C
YES
3
L
5
SYS SW
X = CLOSED
0 = OPEN
SWITCH LOGIC
SWITCH POSITION
L E G E N D
- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
AR
MS
CIRCUIT
CAP
COMPR
- CAPACITOR
- COMPRESSOR
1
2
3
4
5
- GROUND LEAD
- COMBINATION TERMINAL
O
X
X
X
O
O
O
O
O
X
O
O
O
X
O
O
O
X
O
O
O
X
O
O
O
OFF
MTR
- FAN MOTOR
LOW COOL
MED COOL
HI COOL
FAN ONLY
OVLD
SYS SW
IDT
- OVERLOAD PROTECTOR
- SYSTEM SWITCH
- PLASTIC INSULATOR
- INDOOR THERMOSTAT
PART NO.
619-405-01
REV.
00
55
MODELS
ES12J33B-A, ES16J33A-A, EM18J34B-A, EL25J35-A, EL35J35-B, EK18J34A
WIRING DIAGRAM
RED
BLUE
COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REFER TO
YELLOW
MARKINGS ON
COMPRESSOR
RED
ALTERNATE
SYSTEM SWITCH
BLUE
COMPRESSOR
M S
H
4
3
2
COMPRESSOR
WIRE HARNESS
1
L 1
M
5
BLUE
RED
L
A R
C 2
C
THERMOSTAT
3
BLACK
GRAY
OVERLOAD
PROTECTOR
1
2
WHITE
BLACK
BLUE
ORANGE
BROWN
FAN
MOTOR
PURPLE
BLUE
BLACK OR WHITE
ANTICIPATOR
RESISTOR
ROCKER SWITCH
(GE)
SUPPLY
CORD
ORANGE
RED
c
RED
RED
BLUE
RIBBED CONDUCTOR
OR BLUE
GREEN
BROWN
TO CAPACITOR
BRACKET
CAPACITOR
TO CAPACITOR
BRACKET
HEATER
TO CHASSIS
SCHEMATIC
L2
L1
L1
1
MEDIUM
M
MS
R
1
2
3
NO
OVLD
2
HIGH
LOW
MS
MTR
H
L
C
FAN
CAP
YES
3
S
4
5
3
IDT
2
3
1
R
C
6
C
COMPR
S
1
OVLD
HERM
C
2
4
7
C2
CAP
8
9
AR
HL
TF
HTR
AR
10
5
SYS SW
X = CLOSED
0 = OPEN
CIRCUIT
1 2 3 4 5 6 7 8 9 10
O O O O O O O O O O
O O O X X O X O X O
O X O O X O X O X O
O O X O X O X O X O
O O X O O X O X O X
SWITCH LOGIC
SWITCH POSITION
L E G E N D
AR
MS
- ANTICIPATOR RESISTOR
HTR
- HEATER
- MONEY SAVER/ROCKER SWITCH
- CAPACITOR
HL
TF
- HEATER LIMIT
- THERMAL FUSE
OFF
CAP
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY
COMPR
MTR
OVLD
- COMPRESSOR
- GROUND LEAD
- FAN MOTOR
- COMBINATION TERMINAL
- PLASTIC INSULATOR
- OVERLOAD PROTECTOR
SYS SW
IDT
- SYSTEM SWITCH
O X O O O X O X O X
O O O X O X O X O X
X O O O O O O O O O
- INDOOR THERMOSTAT
PART NO.
619-405-02
REV.
00
56
MODELS
YS12J33-A, YM18J34B-A, YL24J35C-A
RED
WIRING DIAGRAM
BLUE
COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REVERSING
VALVE ASY
REFER TO
MARKINGS ON
COMPRESSOR
RED
SYSTEM SWITCH
THERMOSTAT
3
M S
BLUE
4
3
2
1
ALTERNATE
L 1
M
5
1
2
YELLOW
COMPRESSOR
BLUE
COMPRESSOR
WIRE HARNESS
L
H
A R
C 2
C
BLUE
RED
GRAY
BLACK
OVERLOAD
PROTECTOR
YELLOW
DEFROST
THERMOSTAT
WHITE
BLACK
BLUE
ORANGE
BROWN
BLACK
FAN
MOTOR
3
2
ORANGE
1
BLACK
PURPLE
BLUE
BLACK OR WHITE
ANTICIPATOR
RESISTOR
ROCKER SWITCH
(GE)
ORANGE
RED
SUPPLY
CORD
c
RED
RED
RIBBED CONDUCTOR OR BLUE
BLUE
GREEN
BROWN
TO CAPACITOR
BRACKET
CAPACITOR
HEATER
TO CAPACITOR
BRACKET
TO CHASSIS
SCHEMATIC
L2
L1
L1
1
MEDIUM
M
MS
R
3
2
3
YES
OVLD
2
HIGH
LOW
MS
H
L
MTR
FAN
CAP
C
NO
1
S
4
R
3
3
1
ODT
2
IDT
2
OVLD
3
1
5
6
COMPR
C
C
HERM
C
1
S
CAP
2
4
7
C2
HL
TF
RV
HTR
8
9
AR
10
5
SYSTEM SWITCH
X = CLOSED
0 = OPEN
CIRCUIT
SWITCH LOGIC
SWITCH POSITION
L E G E N D
AR
MS
- ANTICIPATOR RESISTOR
- MONEY SAVER
- CAPACITOR
HTR
- HEATER
1 2 3 4 5 6 7 8 9 10
O O O O O O O O O O
O O O X X O X O X O
O X O O X O X O X O
O O X O X O X O X O
O O X O O X O X O X
HL
TF
- HEATER LIMIT
- THERMAL FUSE
OFF
CAP
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY
COMPR
MTR
OVLD
- COMPRESSOR
- FAN MOTOR
- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR
- OVERLOAD
RV
- REVERSING VALVE
O X O O O X O X O X
O O O X O X O X O X
X O O O O O O O O O
IDT
ODT
- INDOOR THERMOSTAT
- OUTDOOR THERMOSTAT
PART NO.
619-405-04
REV.
01
57
MODEL
YS09J10B-A
RED
WIRING DIAGRAM
BLUE
COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REFER TO
MARKINGS ON
COMPRESSOR
SYSTEM
SWITCH
RED
THERMOSTAT
3
REVERSING
VALVE
M S
H
BLUE
4
3
2
ALTERNATE
1
1
5
L
1
2
COMPRESSOR
YELLOW
COMPRESSOR
WIRE HARNESS
L
M
A R
C
C 2
GRAY
BLUE
RED
BLACK
BLACK
OVERLOAD
PROTECTOR
DEFROST
THERMOSTAT
YELLOW
WHITE
BLACK
BLUE
ORANGE
BROWN
FAN
MOTOR
3
1
2
PINK
PURPLE
BLUE
BLACK OR WHITE
ROCKER SWITCH
(GE)
ANTICIPATOR
RESISTOR
SUPPLY
CORD
RED
c
RED
RIBBED CONDUCTOR OR BLUE
BLUE
GREEN
BROWN
TO CAPACITOR
BRACKET
CAPACITOR
TO CAPACITOR
BRACKET
TO CHASSIS
SCHEMATIC
L2
L1
L1
1
MEDIUM
M
MS
R
2
3
1
NO
OVLD
2
HIGH
LOW
MS
H
L
MTR
S
FAN
C
YES
3
4
CAP
R
3
IDT
2
OVLD
3
1
5
6
7
COMPR
C
C
HERM
C
1
S
2
4
C2
RV
8
9
3
ODT
2
AR
1
10
5
SYSTEM SWITCH
X = CLOSED
0 = OPEN
CIRCUIT
1 2 3 4 5 6 7 8 9 10
O O O O O O O O O O
O O O X X O X O X O
O X O O X O X O X O
O O X O X O X O X O
O O X O O X O X O X
SWITCH LOGIC
SWITCH POSITION
L E G E N D
AR
MS
- ANTICIPATOR RESISTOR
- MONEY SAVER
- CAPACITOR
OFF
CAP
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY
COMPR
MTR
OVLD
- COMPRESSOR
- FAN MOTOR
- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR
- OVERLOAD PROTECTOR
- REVERSING VALVE
RV
O X O O O X O X O X
O O O X O X O X O X
X O O O O O O O O O
IDT
ODT
- INDOOR THERMOSTAT
- OUTDOOR THERMOSTAT
PART NO.
619-142-17
REV.
01
58
MODELS
EQ08J11-A, EQ08J11-B
BLUE
WIRING DIAGRAM
YELLOW
COMPRESSOR
L 1
L 2
BLUE
M S
"F"
C
RED
"F"
"F"
S
R
C
2
L
H
SWITCH
SYSTEM
HARNESS, COMPR.
C
R
S
NOTE:
OPTIONAL
THERMOSTAT
CONFIGURATION
SUPPLY CORD
RIBBED CONDUCTOR
BLACK
WHITE
CAPACITOR
RED
C
RED
TO CAPACITOR
BRACKET
BLUE
BROWN
BLACK
RED
ORANGE
FAN
MOTOR
HEATER
SCHEMATIC
L2
L1
IDT
1
R
OVLD
L1
L2
C
2
COMPR
S
C
1
2
HERM
C
3
2
CAP
HL
HTR
TF
H
L
3
4
R
OVLD
MS
MTR
FAN
CAP
C
S
SYS SW
X = CLOSED
0 = OPEN
SWITCH LOGIC
SWITCH POSITION
L E G E N D
CIRCUIT
HL
CAP
- HEATER LIMIT
- CAPACITOR
TF - THERMAL FUSE
1
2
3
4
- PRE-INSULATED CONDUCTOR
COMPR
- COMPRESSOR
1
O
O
X
X
O
O
O
O
O
O
X
X
O
X
X
O
O
X
O
O
O
X
X
O
OFF
- GROUND LEAD
- COMBINATION TERMINAL
MTR
- FAN MOTOR
2
3
4
5
6
FAN
HI COOL
LOW COOL
OVLD
SYS SW
IDT
- OVERLOAD PROTECTOR
- SYSTEM SWITCH
- PLASTIC INSULATOR
- INDOOR THERMOSTAT
- HEATER
LOW HEAT
HI HEAT
PART NO.
617-581-12
REV.
01
HTR
59
MODELS
WS07A10E-B, WS07A10E-C, WS10A10-A, WS12A10E-A,
WS09A30E-B, WS12A30E-A, WS15A30-A
WIRING DIAGRAM
COMPRESSOR
BLUE
SYSTEM SWITCH
C
OVERLOAD
PROTECTOR
PURPLE
L
2
M S
L
M
1
H
COMPRESSOR
WIRE HARNESS
BLACK
CAPACITOR
THERMOSTAT
RED
BLACK
PURPLE
RED
c
WHITE (OR YELL0W)
BROWN
SUPPLY CORD
BLUE
TO GROUNDING
SCREW
FAN
MOTOR
(115 V)
(208/230 V)
NEUTRAL
SCHEMATIC
L2
L1
IDT
R
OVLD
1
2
2
1
L1
C
COMPR
S
C
HERM
C
CAP
2
HIGH
H
3
R
OVLD
MEDIUM
LOW
MS
M
L
MTR
S
4
5
FAN
CAP
C
SYS SW
X = CLOSED
0 = OPEN
SWITCH LOGIC
SWITCH POSITION
L E G E N D
CIRCUIT
CAP
COMPR
- CAPACITOR
- COMPRESSOR
1
2
3
4
5
- GROUND LEAD
- COMBINATION TERMINAL
O
X
X
X
O
O
O
O
O
X
O
O
O
X
O
O
O
X
O
O
O
X
O
O
O
OFF
MTR
- FAN MOTOR
LOW COOL
MED COOL
HI COOL
FAN ONLY
OVLD
SYS SW
IDT
- OVERLOAD PROTECTOR
- SYSTEM SWITCH
- PLASTIC INSULATOR
- INDOOR THERMOSTAT
PART NO.
617-581-14
REV.
00
60
MODELS
WE09A33E-B, WE12A33E-A, WE15A33-A
WIRING DIAGRAM
COMPRESSOR
WHITE
PURPLE
PINK
BLUE
SYSTEM SWITCH
OVERLOAD
PROTECTOR
M S
H
4
3
2
1
L 1
M
5
COMPRESSOR
WIRE HARNESS
L
A R
C 2
C
3
2
RED
1
BROWN
BLACK
THERMOSTAT
PURPLE
FAN
MOTOR
RED
YELLOW
YELLOW
BROWN
SUPPLY
CORD
SMOOTH CONDUCTOR
RIBBED CONDUCTOR
RED
ORANGE
YELLOW
c
CAPACITOR
BLUE
HEATER
L2
L1
SCHEMATIC
L1
1
2
MEDIUM
M
R
OVLD
HIGH
LOW
3
MTR
S
H
MS
C
FAN
CAP
L
4
5
3
3
2
C
R
1
1
6
C
COMPR
OVLD
HERM
C
S
7
2
4
CAP
C2
AR
8
9
HL
TF
HTR
10
5
SYS SW
X = CLOSED
0 = OPEN
CIRCUIT
SWITCH LOGIC
SWITCH POSITION
L E G E N D
AR
MS
- ANTICIPATOR RESISTOR
HTR
- HEATER
- MONEY SAVER/ROCKER SWITCH
- CAPACITOR
1 2 3 4 5 6 7 8 9 10
O O O O O O O O O O
O O O X X O X O X O
O X O O X O X O X O
O O X O X O X O X O
O O X O O X O X O X
HL
TF
- HEATER LIMIT
- THERMAL FUSE
OFF
CAP
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY
COMPR
MTR
- COMPRESSOR
- GROUND LEAD
- FAN MOTOR
- COMBINATION TERMINAL
- PLASTIC INSULATOR
OVLD
SYS SW
IDT
- OVERLOAD PROTECTOR
- SYSTEM SWITCH
O X O O O X O X O X
O O O X O X O X O X
X O O O O O O O O O
- INDOOR THERMOSTAT
PART NO.
617-581-15
REV.
00
61
MODELS
WY09A33F-A, WY12A33G-A
WHITE
BLUE
WIRING DIAGRAM
BLUE
BLUE
BLACK
BROWN
YELLOW
SYSTEM SWITCH
M S
4
3
2
1
L 1
5
REV VALVE
BLUE
BLACK
L
M
H
A R
C 2
C
BLACK
BLUE
COMPRESSOR
FAN MOTOR
BLACK
PURPLE
C
RED
R
3
2
YELLOW
BROWN
1
HARNESS, COMPRESSOR
MOLDED
THERMOSTAT
BLACK
BLACK
BLUE
BLACK
DEFROST
T/STAT
OVERLOAD,
PROTECTOR
HEATER
ORANGE
ORANGE
YELLOW
SMOOTH CONDUCTOR
RIBBED CONDUCTOR
SUPPLY CORD
c
RED
YELLOW
BLUE
CAPACITOR
TO GROUNDING
SCREW
L2
L1
SCHEMATIC
L1
MS
C
1
MEDIUM
M
H
R
2
OVLD
HIGH
3
4
MTR
FAN
CAP
C
S
LOW
L
3
R
IDT
3
OVLD
5
3
2
COMPR
C
2
6
HERM
C
1
S
CAP
1
1
7
2
ODT
HL
TF
RV
HTR
C2
8
4
5
9
AR
10
X = CLOSED
0 = OPEN
CIRCUIT
SWITCH LOGIC
SWITCH POSITION
L E G E N D
HTR
HL
TF
- HEATER
MS
- MONEY SAVER
- CAPACITOR
1 2 3 4 5 6 7 8 9 10
O O O O O O O O O O
O O O X X O X O X O
O X O O X O X O X O
O O X O X O X O X O
O O X O O X O X O X
- HEATER LIMIT
- THERMAL FUSE
OFF
CAP
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY
COMPR
MTR
- COMPRESSOR
- FAN MOTOR
- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR
OVLD
- OVERLOAD PROTECTOR
- REVERSING VALVE
RV
IDT
ODT
O X O O O X O X O X
O O O X O X O X O X
X O O O O O O O O O
- INDOOR THERMOSTAT
- OUTDOOR THERMOSTAT
PART NO.
REV.
03
617-581-02
62
Testing The Electronic Control
2001 XQ Boards & QME Boards
Checking Room Temperature:
1. Check the room temperature at the electronic control pad by pressing at the same time the
"FAN SPEED" button and the temperature "UP" button on XQ models.
2. Check the room temperature at the electronic control pad by pressing at the same time the
"FAN SPEED" button and the "WARMER" button on QME models. The indoor temperature
will display for 10 seconds. Indoor temperature can be viewed in all modes, including the TEST
mode. The display can be changed back to SET temperature by pressing any key, except the
ON/OFF button, or after 10 seconds has elapsed.
Activating Test Mode: Activate test mode by pressing at the same time the "MODE" button and
the temperature "DOWN" button on XQ models. LEDs for Hour, Start, and Stop will blink 1
bps while Test Mode is active. Activate test mode by pressing at the same time the "MONEY
SAVER" button and the "FILTER ALERT" button on QME models. LED for the Filter Alert will
blink 1 bps while Test Mode is active.
Test Mode has duration of 90 minutes. Test Mode can be activated under any conditions,
including Off. Test Mode is cancelled by pressing the On/Off button, unplugging the unit, or
when the 90 minutes is timed out. All settings revert to the factory default settings of Cool, 75
degrees F, Timer and Set Hour features are nonfunctional.
Test Mode overrides the three-minute lockout, all delays for compressor and fan motor start /
speed change, and no delay when switching modes. Test Mode default settings are ON, Money
Saver, 60 degrees F, and High fan speed
.
Activating Error Code Mode: (Submode of Test Mode) Unit has to be in Test Mode to enter Error
Code Mode
1. Activate Error Code Mode by pressing the "TIMER ON/OFF" button on XQ models. LED for
the "TIMER ON/OFF" will flash 1 bps while Error Code Mode is active. Pressing the "TEMP/
HR + " button will display 00. Consecutive presses will scroll through all error codes logged.
Press the "TEMP/HR - " button to see the reverse order of all error codes logged. When the
end of logged error codes is reached the temperature set point will appear.
Activate Error Code Mode by pressing at the same time the "A/C START" button and the "ON/
OFF" button on QME models. LED for the "TIMER ON/OFF" will flash 1 bps while Error Code
Mode is active. Pressing the "WARMER" button will display 00. Consecutive presses will scroll
through all error codes logged. Press the "COOLER" button to see the reverse order of all
error codes logged. When the end of logged error codes is reached the temperature set point
will appear.
IMPORTANT
Error Codes are cleared from the log by exiting from Error Code Mode. To exit on XQ models,
press Timer On/Off button. To exit QME models, press A/C Start and On/Off buttons. Or unplug
unit to exit Error Code Mode. Plug unit in after 5 seconds to resume normal operation of unit.
63
FRIEDRICH AIR CONDITIONING CO.
Post Office Box 1540 · San Antonio, Texas 78295-1540
4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212
(210) 357-4400 · fax (210) 357-4480
RACServMn (7-03)
Printed in the U.S.A.
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