Friedrich Racservmn Users Manual Racservmn(7 17 03)_newest.p65

racservmn Room_Air_Service_Manual

2015-02-02

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Service Manual
2003

Room Air Conditioners

RACServMn (7-03)

Table of Contents
Unit Identification ............................................... 3
Unit Specifications ............................................. 4
Unit Performance ......................................... 5-11
Refrigeration Sequence of Operation .............. 12
Electrical Rating Tables ................................... 13
Compressor ..................................................... 14
Thermal Overload (External) ........................... 14
Thermal Overload (Internal) ............................. 15
Fan Motor ........................................................ 15
System Switches/Controls .......................... 15-24
Thermostats (Indoor) .................................. 24-25
Thermostats (Defrost) ................................ 25-26
Resistor (Heat Anticipator) ............................... 26
Capacitor, Run ................................................. 26
Check Valve .................................................... 27
Heat Pump Reversing Valve ............................ 27
Solenoid Coil (Heat Pump Models) .................. 28
Valve, Drain Pan .............................................. 29
Heating Element .............................................. 29
Sealed Refrigeration Repairs ...................... 29-30
Refrigerant Charging .................................. 30-31
Undercharged Refrigerant Systems ........... 31-32
Overcharged Refrigerant Systems .................. 32
Restricted Refrigerant System ......................... 33
Routine Maintenance ....................................... 34
Troubleshooting .......................................... 34-45
Wiring Diagrams
"RS", "RM", ................................................... 46
"SQ" ............................................................. 47
"KQ" ........................................................ 48-49
"XQ" ............................................................. 50
"YQ" ............................................................. 51
"SC" ............................................................. 52
"SS", "SM" .................................................... 53
"SL" .............................................................. 54
"KS", "KM", "KL" ........................................... 55
"ES", "EM", "EL", "EK" .................................. 56
"YS13", "YM", "YL" ....................................... 57
"YS09" .......................................................... 58
"EQ" ............................................................. 59
"WS" ............................................................. 60
"WE" ............................................................. 61
"WY" ............................................................. 62
Testing XQ and QME Boards .......................... 63

Typical Unit Components
Fresh Air

Compressor

Capillary Tube

Liquid Filter Driers

Reversing Valve
(some models)

Condenser Coil
Discharge Air

Front Cover

Outdoor Grille

System Switches
Evaporator Coil

Sleeve

Return Air Grille/Filter
Blower Wheel
Blower Motor

Basepan

Condenser Fan Blade

Introduction
This service manual is designed to be used in conjunction
with the installation manuals provided with each air
conditioning system component.
This service manual was written to assist the professional
RAC service technician to quickly and accurately diagnose
and repair malfunctions.
This manual will deal with subjects in a general nature.
(i.e. all text will not pertain to all models).
IMPORTANT: It will be necessary for you to accurately
identify the unit you are servicing, so you can be certain of
a proper diagnosis and repair. (See Unit Identification.)

The information contained in this manual is intended
for use by a qualified service technician who is
familiar with the safety procedures required in
installation and repair, and who is equipped with the
proper tools and test instruments.
Installation or repairs made by unqualified persons
can result in hazards subjecting the unqualified
person making such repairs to the risk of injury or
electrical shock which can be serious or even fatal
not only to them, but also to persons being served
by the equipment.
If you install or perform service on equipment, you
must assume responsibility for any bodily injury or
property damage which may result to you or others.
Friedrich Air Conditioning Company will not be
responsible for any injury or property damage arising
from improper installation, service, and/or service
procedures.

UNIT IDENTIFICA
TION
IDENTIFICATION
Model Number Code

S S 08 J 1 0 R
1st Digit – Function
S = Straight Cool, Value Series
C = Straight Cool, Budget
Series
Y = Heat Pump
E = Electric Heat
K = Straight Cool, Challenger
Series
W = Thru-the Wall,
WallMaster Series

8th Digit – Engineering
Major change

7th Digit – Options
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

6th Digit – Voltage

2nd Digit

1 = 115 Volts
2 = 230 Volts
3 = 230-208 Volts

C = Casement
P = PowerMiser "Portable"
Q = Q-Star
M = Medium Chassis
L = Large Chassis
W = Built -In
H = HazardGard

5th Digit
Alphabetical Modifier

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=0
C=3
F=6
A=1

D=4

G=7

B=2

E=5

H=8

Year Manufactured
A=1
D=4
G=7

L
J=9

K=0

00001
Production Run Number

PRODUCT LINE
S=RAC

B=2

E=5

H=8

P=PTAC

C=3

F=6

J=9

E=EAC

Month Manufactured
A=Jan D=Apr G=Jul

V=VPAK
K=Oct

H=Split

B=Feb E=May H=Aug L=Nov
C=Mar F=Jun

J=Sep

M=Dec
3

PERFORMANCE
DATA*
Cooling
EQ08J11-A
EQ08J11-B

DATA*
Cooling

XQ05J10B
XQ06J10-A
XQ06J10-B
XQ07J10-1
XQ08J10-1
XQ08J10-A

PERFORMANCE
DATA*
Cooling
SQ05J10B-B
SQ06J10B-A
SQ06J10B-B
SQ08J10C-1

PERFORMANCE
DATA*
Cooling
KQ05J10B-B
KQ05E10-B
KQ05E10-C
KQ06J10B-A
KQ06J10B-B
KQ06E10-A
KQ06E10-B
YQ06J10B-A

EQ PERFORMANCE DATA
EVAPORATOR AIR
OPERATING
ELECTRICAL
TEMP. DEG. F.
PRESSURES
RATINGS
Discharge Temp.
Suction
Discharge Amps
Locked
Air
Drop F.
Rotar Amp
50.5
29.5
72
262
7.5
39.2
50.5
29.5
74
259
7.5
39.2

R-22
REFRIG.
Charge in
OZ.
20
20

BREAKER
FUSE
60 Hertz
Amps
15
15

XQ PERFORMANCE DATA
EVAPORATOR AIR
OPERATING
ELECTRICAL
TEMP. DEG. F.
PRESSURES
RATINGS
Discharge Temp.
Suction
Discharge Amps
Locked
Air
Drop F.
Rotar Amp
55.45
24.55
79
245
4.6
34
51.45
28.55
82
262
5.1
35
51.45
28.55
79
254
5.1
35
52.22
27.95
77
250
6.5
37
50.5
29.5
72
262
4.5
38
50.5
29.5
72
262
4.5
38

R-22
REFRIG.
Charge in
OZ.
20
21
21
24
20
21

BREAKER
FUSE
60 Hertz
Amps
15
15
15
15
15
15

SQ PERFORMANCE DATA
ELECTRICAL
OPERATING
RATINGS
PRESSURES
Suction
Discharge Amps
Locked
Rotar Amp
79
245
4.4
34.'0
82
262
5.2
35.'0
79
254
5.2
35.'0
72
262
7.5
39.2

R-22
REFRIG.
Charge in
OZ.
16.'0
15.7
15.7
19.5

BREAKER
FUSE
60 Hertz
Amps
15
15
15
15

KQ-YQ PERFORMANCE DATA
EVAPORATOR AIR
OPERATING
ELECTRICAL
TEMP. DEG. F.
PRESSURES
RATINGS
Discharge Temp.
Suction
Discharge Amps
Locked
Air
Drop F.
Rotar Amp
56.34
28.66
73
251
5.2
29.'0
56.34
28.66
79
245
5.2
29.'0
56.34
28.66
79
245
5.2
29.'0
58.02
21.98
82
262
5.8
35.'0
58.02
21.98
80
269
5.8
35.'0
58.02
21.98
82
262
5.8
35.'0
58.02
21.98
79
254
5.8
35.'0
54.1
25.9
81
267
5.7
39.2

R-22
REFRIG.
Charge in
OZ.
15.'0
15.'0
15.'0
15.'0
19.'0
15.'0
15.'0
19.'0

BREAKER
FUSE
60 Hertz
Amps
15
15
15
15
15
15
15
15

EVAPORATOR AIR
TEMP. DEG. F.
Discharge Temp.
Air
Drop F.
55.45
24.55
51.45
28.55
51.45
28.55
50.5
29.5

*Rating Conditions: 80 degree F. Room Air Temperature and 50% Relative Humidity with
95 degree F. Outside Air Temperature and 40% Relative Humitidy

RS-RM PERFORMANCE DATA

PERFORMANCE
DATA*
Cooling
RS10J10-C
RS12J10A-B
RS15J10-A
RS16J30A-A
RS18J30-A
RM24J30-A

EVAPORATOR AIR
TEMP. DEG. F.
Discharge Temp.
Air
Drop F.
61
19
57
23
57
23
56.5
24
56
24
57
23.65

OPERATING
PRESSURES
Suction Discharge
82
83
77
77
72
68

248
271
279
296
293
301

R-22
BREAKER
ELECTRICAL
REFRIG.
FUSE
RATINGS
Amps
Locked Charge in 60 Hertz
Rotar Amp
OZ.
Amps
7.5
44
26
15
9.8
54
30
15
11.1
42
29.5
15
7.2
42
30
15
8.7
42
48
15
12.2
44
54
15

YS-YM-YL PERFORMANCE DATA
PERFORMANCE
DATA*
Cooling
YS09J10B-A
YS12J33-A
YM18J34B-A
YL24J35C-A

EVAPORATOR AIR
TEMP. DEG. F.
Discharge Temp.
Air
Drop F.
59
21
56
24
53
27
55
25

OPERATING
PRESSURES
Suction Discharge
90
80
74
72

243
264
284
260

ELECTRICAL
R-22
BREAKER
REFRIG.
FUSE
RATINGS
Amps
Locked Charge in 60 Hertz
Rotar Amp
OZ.
Amps
7.7
39.2
25
15
5.2/5.6
30
28
20
8.7/9.2
42
54
30
10.0/12.0
61
74
30

* Rating Conditions: 80 degree F. Room Air Temperature and 50% Relative Humidity with
95 degree F. Outside Air Temperature at 40% Relative Humidity.

PERFORMANCE
DATA*
Cooling
ES12J33B-A
ES16J33A-A
EM18J34B-A
EL25J35-A
EL35J35-A
EL35J35-B
PERFORMANCE
DATA heating
ES12J33B-A
ES16J33A-A
EM18J34B-A
EL25J35-A
EL35J35-A
EL35J35-B

EVAPORATOR AIR
TEMP. DEG. F.
Discharge Temp.
Air
Drop F.
58
22
53
27
55
25
55
25
52
28
52
28

OPERATING
PRESSURES
Suction Discharge
82
77
71
75
72
72

265
269
267
284
317
317

ELECTRICAL
R-22
BREAKER
RATINGS
REFRIG.
FUSE
Amps
Locked Charge in 60 Hertz
Rotar Amp
OZ.
Amps
5.76.6
26.3
28
20
7.5/8.0
42.'0
30
20
8.6/9.2
42.'0
40.5
30
11.5/12.6
61.'0
48.5
30
18/20
94.'0
60
30
18/20
94.'0
60
30

Heat Rise
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

KS10E10-A
KS10J10-B
KS12E10-A
KS12J10B-A
KS15J10-A
KS12J30B-A
KS18J30-A
KM20J30-A
KM24J30-A

EVAPORATOR AIR
TEMP. DEG. F.
Discharge Temp
Air
Drop F.
61
19
61
19
57
23
57
23
55.78
23.52
57
23
56
24
55
24
55
25

OPERATING
PRESSURES

82
80
83
84
77
76
72
70
68

248
263
271
268
279
285
293
279
301

ELECTRICAL
R-22
BREAKER
RATINGS
REFRIG.
FUSE
Amps
Locked Charge in 60 Herts
Rotar Amp
OZ.
Amps
9.1
48.3
26.08
15
9.1
48.3
26.88
15
10.8
54.'0
28
15
10.8
54.'0
28
15
12.'0
67.'0
29.5
15
6.2
26.'0
30.08
15
8.7
48
48
15
9.9
48
48
15
15.'0
71.'0
54.08
15

* Rating Conditions: 80 degree F. Room Air Temperature and 50% Relative Humidity with
95 degree F. Outside Air Temperature at 40% Relative Humidity.

SS PERFORMANCE DATA

PERFORMANCE
DATA*
Cooling
SS08J10R-B
SS08J10R-A
SS09J10C-A
SS10J10AR-A
SS12J10AR-B
SS14J10R-A
SS12J30D-A
SS16J30A-A
SS18J30R-A

EVAPORATOR AIR
TEMP. DEG. F.
Discharge Temp.
Air
Drop F.
61.4
18.6
61.4
18.6
57.8
22.2
57.22
22.78
57.2
22.8
57.22
22.9
57.2
22.8
56.9
23
56.9
23

OPERATING
PRESSURES
Suction Discharge
87
84
82
84
83
77
82
77
77

251
248
254
245
271
279
265
296
293

ELECTRICAL
R-22
BREAKER
RATINGS
REFRIG.
FUSE
Amps
Locked Charge in 60 Hertz
Rotar Amp
OZ.
Amps
6.7
29
39.'0
15
6.7
36.2
24.'0
15
7.4
44
22.6
15
7.5
42
26.'0
15
9.8
44
30.'0
15
12
61
29.5
15
5.0/5.2
21
27.5
20
7.5/8.0
28
30.'0
20
8.1/8.7
45
48
20

SM-SL PERFORMANCE DATA

PERFORMANCE
DATA*
Cooling
SM20J30-A
SM24J30-A
SL25J30-A
SL28J30B-A
SL35J30-A
SL35J30-B

EVAPORATOR AIR
TEMP. DEG. F
Discharge Temp
Air
Drop F.
52.58
27.42
54.86
25.14
52.32
27.68
52.1
26.9
52.93
27.07
52.93
27.07

OPERATING
PRESSURES
Suction Discharge
70
68
75
74
72
72

279
301
284
278
317
317

ELECTRICAL
R-22
BREAKER
RATINGS
REFRIG. FUSE
Amps
Locked Charge in 60 Hertz
Rotar Amp
OZ.
Amps
9.9
43
47
20
12.2
68
54
20
11.5/12.6
68
48.5
20
13.0/14.2
88
50
20
18.0/20.0
92
60
30
18.0/20.0
92
60
30

* Rating Conditions: 80 degree F. Room Air Temperature and 50% Relative Humidity with
95 degree F. Outside Air Temperature at 40% Relative Humidity.

WS PERFORMANCE DATA

PERFORMANCE
DATA*
Cooling
WS07A10E-B
WS07A10E-C
WS07A10E-D
WS10A10-A
WS10A10-B
WS12A10E-B
WS13A10-A
WS09A30E-B
WS12A30E-A
WS12A30E-B
WS15A30-A

EVAPORATOR AIR
TEMP. DEG. F.
Discharge Temp.
Air
Drop F.
59.5
19.5
59.5
19.5
59.5
19.5
58
22
58
22
55
25
55
25
58
22
47.1
32.9
46
33
47
33

OPERATING
PRESSURES
Suction Discharge
84
85
85
83
83
81
79
86
80
80
72

300
299
299
307
307
290
281
302
308
305
310

ELECTRICAL
R-22
BREAKER
RATINGS
REFRIG.
FUSE
Amps
Locked Charge in 60 Hertz
Rotar Amp
OZ.
Amps
7.'0
32
19
15
7.'0
32
28
15
7.'0
32
20
15
9.8
48
25
15
9.8
48
26
15
11.9
54
28.5
15
12
55
36
15
4.7
44
22
15
11.9
54
27.5
15
11.9
54
42
15
8.5
42
43.5
15

WE-WY PERFORMANCE DATA
DATA*
Cooling

WE09A33E-C
WE12A33E-B
WE15A33-A
WY09A33F-A
WY12A33G-A
PERFORMANCE
DATA heating
WE15A33-A
WE09A33E-C
WE12A33E-B

EVAPORATOR
TEMP. DEG. F.
Discharge Temp.
Air
Drop F.
58
22
55
25
47.1
32.9
58
22
55
25

OPERATION
PRESSURES
Suction Discharge
86
80
71
83
81

302
308
310
288
295

ELECTRICAL
R-22
BREAKER
RATINGS
REFRIG.
FUSE
Amps
Locked Charge in 60 Hertz
Rotar Amp
OZ.
Amps
4.7
44
23
20
6.5
54
27.5
20
8.5
42
43.5
20
4.3
44
24
20
6.2
54
37
20

Heat Rise
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

SPECIFICATIONS

PERFORMANCE DATA*

SC06H10E

DISCHARGE

56.1

BTUH (Cooling)

5950

E.E.R. (Cooling)

8.0

EVAPORATOR AIR

AIR

Volts

115

TEMP. °F

TEMP

Amperes (Cooling)

6.8

Total Watts (Cooling)

760

OPERATING

SUCTION

Hertz

PRESSURES

DISCHARGE

293

Fuse/Breaker Size

AMPS

6.8

LOCKED

35.0

DROP °F

Fan RPM

1595

ELECTRICAL

Evaporator Air CFM

125

RATINGS

Dehumidification Pts/Hr

2.0

ROTOR AMPS

Width

1411/16"

R-22

CHARGE IN

Height

1013/16"

REFRIG.

OUNCES

Depth

27"

COMP.

CHARGE IN

Minimum Ext. Into Room

2½"

OIL

FLUID OZ.

Minimum Ext. To Outside

15½"

Net Weight

Shipping Weight

PERFORMANCE DATA

23.9

9.8

* Rating Conditions:
80°F Room Air Temperature and 50% Relative Humidity with
95°F Outside Air Temperature at 40% Relative Humidity.

*YS09J10B-A

**YS12J33-A

**YM18J34A-A

**YL24J35C-A

8300

12400/12300
10700/8900

17200/17200
13000/10600

23000/22800
17300/14300

19.62

31.38
28.69/23.87

24.74
24.46/20.22

31.71
24.38/20.16

(Heating)
AHAM

@ 70°F Inside 47°F Outside
@ 70°F Inside 35°F Outside

Evaporator Air Temperature Rise
@ 70°F Inside 47°F Outside
@ 70°F Inside 35°F Outside
AMPS

@ 70°F Inside 47°F Outside
@ 70°F Inside 35°F Outside

6.7

6.0/6.5
16.0/14.7

8.5/9.0
19.5/17.0

10.4/11.5
24.0/22.4

Watts

@ 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

53.5/222

52.5/251

53/225

54/236.5

Suction/Head PSIG
@ 70°F Inside 47°F Outside

* Do not operate below 37° ambient.
** Heating element comes on at 35°F outside ambient and compressor shuts off.

PERFORMANCE DATA
(Heating)
BTUH

*WY09A33F-A

*WY12A33F-A

9700
9300
8800
8200/8100
7600
6800
11000/9100

12400
12000
11400
10800/10400
10000
9000
11000/9100

@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

32.00
30.75
29.10
27.10/26.80
25.10
22.50
36.40/30.10

37.60
36.40
34.50
32.70/31.50
30.30
27.30
33.30/27.60

@70°F Inside 62°F Outside

4.0

5.6

@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

3.9
3.85
3.8/4.1
3.6
3.4
16.0/14.7

5.5
5.4
5.3/5.6
5.1
4.8
16.0/14.7

@70°F Inside 62°F Outside

880

1280

@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

870
860
835/810
800
760
3550/2950

1260
1220
1175/1155
1130
1070
3550/2950

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 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

Evaporator Air Temperature Rise

AMPS

Watts

Suction/Head PSIG

@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

* Heating Element comes on at 35°F outside ambient and compressor shuts off.
** AHAM Rating Conditions.

Refrigeration System
Sequence of Operation
A good understanding of the basic operation of the refrigeration
system is essential for the service technician. Without this
understanding, accurate troubleshooting of refrigeration
system problems will be more difficult and time consuming, if
not (in some cases) entirely impossible. The refrigeration
system uses four basic principles (laws) in its operation they
are as follows:
1. "Heat always flows from a warmer body to a cooler body."
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
pressure area."
4. "The temperature at which a liquid or gas changes state
is dependent upon the pressure."
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
compressor then "compresses" this refrigerant, raising its
pressure and its (heat intensity) Temperature.
The refrigerant leaves the compressor through the discharge
line as a hot high pressure gas (vapor). The refrigerant enters
the condenser coil where it gives up some of its heat. The
condenser fan moving air across the coil's finned surface
facilitates the transfer of heat from the refrigerant to the
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
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.
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.
The liquid refrigerant next enters the metering device. The metering
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.

In the case of the capillary tube this is accomplished (by design)
through size (and length) of device, and the pressure difference
present across the device.
Since the evaporator coil is under a lower pressure (due to the
suction created by the compressor) than the liquid line, the liquid
refrigerant leaves the metering device entering the evaporator coil.
As it enters the evaporator coil, the larger area and lower pressure
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
that heat. This results in a lowering of the indoor air temperature,
hence the "cooling" effect.
The expansion and absorbing of heat cause the liquid refrigerant
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 particular system design determines at exactly what point (in
the evaporator) the change of state (i.e. liquid to a gas) takes
place. In all cases, however, the refrigerant must be totally
evaporated (changed) to a gas before leaving the evaporator coil.
The low pressure (suction) created by the compressor causes the
refrigerant to leave the evaporator through the suction line as a
cool low pressure vapor. The refrigerant then returns to the
compressor, where the cycle is repeated.

Suction
Line
Evaporator
Coil

Discharge
Line
Condenser
Coil
Compressor

Metering
Device
Refrigerant
Dryer

Refrigerant
Drier
Liquid
Line

Electrical Rating T
ables
Tables
Circuit Rating
Breaker or T-D Fuse

Plug Face
(NEMA#)

125V - 15A

5 - 15P

KS12J30B, KM18J30C, RS16J30A,
RM18J30A, SS12J30D, SS16J30A, SM18J30BR

250V - 15A

6 - 15P

KM20J30, KM24J30, SM20J30,
SL25J30, SL28J30B*, ES12J33B,
ES16J33A, YS12J33

250V - 20A

6 - 20P

SL35J30, EM18J34B, EL25J35, EL35J35,
YM18J34B, YL24J35C

250V - 30A

6 - 30P

Model
ALL SV and XQ MODELS,
KS10J10, KS12J10B, KS15J10, RS10J10, RS12J10A,
RS15J10, SS08J10R, SS09J10C, SS10J10AR,
SS12J10AR, SS14J10R, SC06H10D,
EQ08J11, YQ06J10B, YS09J10B

Appearance
(Facing Blades)

* 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.

EQ08J11, YQ06J10B

WIKQ

ES12J33B, ES16J33A,
YS09J10B, YS12J33

WIKS

EM18J34B, YM18J34B

WIKM

EL25J35, EL35J35,
YL24J35C

WIKL

Electric shock hazard.
Turn off electric power before service or installation.

Wire Size

Use ONLY wiring size recommended for
single outlet branch circuit.

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

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.

Receptacle

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.

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.
Failure to do so can result in property damage, personal injury and/
or death.

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.
All compressors are internally spring mounted and externally
mounted on rubber isolators.

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.
This condition can be checked as follows:

WINDING TEST
Remove compressor terminal box cover and disconnect wires
from terminals. Using an ohmmeter, check continuity across
the following: (See Figure 1)
1. Terminal "C" and "S" - no continuity - open winding replace compressor.

1. Install a piercing valve on the suction and discharge or
liquid process tube.
2. Attach gauges to the high and low sides of the system.
3. Start the system and run a “cooling or heating
performance test.”
If test shows:

2. Terminal "C" and "R" - no continuity - open winding replace compressor.

A. Below normal high side pressure

3. Terminal "R" and "S" - no continuity - open winding replace compressor.

C. Low temperature difference across coil

B. Above normal low side pressure
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 connection is a must) and the other probe in turn to each compressor terminal (see Figure 2.) If a reading is obtained, the
compressor is grounded and must be replaced.

Heat generated within the compressor shell is usually due to:

FAN MOTOR - TEST
1. Determine that capacitor is serviceable.

1. High amperage
2. Low refrigerant charge

Disconnect fan motor wires from fan speed switch or
system switch.

Apply "live" test cord probes on black wire and common
terminal of capacitor. Motor should run at high speed.

Apply "live" test cord probes on red wire and common
terminal of capacitor. Motor should run at low speed.

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.

3. Frequent recycling
4. Dirty condenser
TERMINAL OVERLOAD - TEST
(Compressor - External Type)
1. Remove overload.
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)

With no power to unit, remove the leads from the compressor terminals.

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
A single phase permanent split capacitor motor is used to drive
the evaporator blower and condenser fan. A self-resetting overload is located inside the motor to protect against high temperature 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".
5. "Fan Only" Position - between terminals "L1" and "2".
RESISTOR
(Heat Anticipator) (SQ 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.

SYSTEM CONTROL PANEL (XQ MODELS ONLY)
(See Figure 9)

1. Power button turns the unit on and off.
2. Fan Speed button allows selection between three cooling speeds and fan only.
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.

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.
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."

Figure 9
System Control Panel (XQ Models Only)

SYSTEM CONTROL PANEL
("KQ" Models Only- See Figure 10)
The KQ Model unit uses a five position control switch to regulate the operation of the unit. Function of each position (clockwise rotation) is as follows:

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:
1. “Off” Turns everything off.

Figure 10
System Control Panel (KQ Models Only)

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.
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.

1. "Off" - Turns everything off.

Figure 12
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 filtered 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 CONTROL SWITCH - TEST (See Figure 11) Turn knob
to phase of switch to be tested. There must be continuity as follows:
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".
3. "Low Cool" Position - between terminals "L1" and "L" and
"C".
4. "Hi Cool" Position - between terminals "L1" and "H" and "C".

Figure 11
System Control Switch
(KQ Models Only)

Turn knob to phase of switch to be tested. There must be
continuity as follows:
1. “Fan Only” Position – between terminals “MS” and “H”
2. “Hi Cool” Position – between terminals “L1” and “C” and
“MS” and “H”
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”
5. “Hi Heat” Position – between terminals “L2” and “2” and
“MS” and “H”

Figure 13
System Control Switch
(EQ Models)

4. "Lo Heat" Position - between terminals "C" and "2", and
"C" and "4".

B1
L2

5. "Hi Heat" Position - between terminals "C" and "1", and
"C" and "4".
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:

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
System Control Panel (SC Model Only)

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 14
System Control Panel (YQ Model Only)

"Hi Cool" Turns on the compressor and fan at high speed

"Lo Cool" Turns on the compressor and fan at low speed.

"Fan Only" Turns on the fan at high speed.

"Off" Turns everything off.

SYSTEM CONTROL SWITCH - TEST (See Figure 15)
Turn knob to phase of switch to be tested. There must be
continuity as follows:

The switching arrangement of the control is as follows:
(See Figure 17)
1.

"Off" All contacts open.

1. "Fan Only" Position - between terminals "C" and "1".

"Hi Fan Contacts closed between terminals "L1" and "1".

2. "Hi Cool" Position - between terminals "C" and "1", "C"
and "3".

3. "Hi Cool" Contacts closed between terminals "L1" to "1"
and "L1" and "C".

3. "Lo Cool" Position - between terminals "C" and "2", and
"C" and "3".

4. "Lo-Cool" Contacts are closed between terminals "L1"
to "2" and "L1 to "C".

Figure 16
System Control Switch
(SC Model Only)

1. Disconnect leads from control switch.
2. Check continuity between all switch positions shown in
Figure 17.
SYSTEM CONTROL PANEL
"WS" Models (See Figure 18)
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 19
System Control Switch
(WS Models)

SYSTEM CONTROL SWITCH "WE" & "WY" Models
(See Figure 20)
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.
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:
SYSTEM CONTROL SWITCH - TEST
Disconnect leads from control switch (See Figure 19)
There must be continuity as follows:
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."
5. "Fan Only" Position - between terminals "L1" and "2."

1. "Off" Position-no continuity between terminals.
2. "Lo Cool" Position-between terminals "C" and "3", "C2"
and "2", "LO" and "M/S", "AR" and "5".
3. "Med Cool" Position-between terminals "C" and "3",
"C2" and "2", "M" and "M/S", "AR" and "5".
4. "Hi Cool" Position-between terminals "C" and "3", "C2"
and "2", "H" and "M/S", "AR" and "5".
5. "Hi Heat" Position-between terminals "C" and "1", "C2"
and "4", "H" and "M/S", "AR" and "5".

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".

SYSTEM CONTROL SWITCH - TEST (See Figure 23)
Disconnect leads from control switch. There must be continuity
as follows:
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."

Figure 21
System Control Switch
Heat Pump / Electric Heat
(WE & WY Models)

4. "Hi Cool" Position - between terminals "L1" and "C,"
"H"and "MS."
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.

Figure 22
System Control Panel (KS, SS, KM, SM, SL)

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 24
System Control Panel - Deluxe Series (RS & RM)

SYSTEM CONTROL SWITCH - TEST
Disconnect leads from control switch (See Figure 25)
There must be continuity as follows:
Figure 25

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.
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.

SYSTEM CONTROL SWITCH (See Figure 26)
(Heat Pump & Electric Heat Models)
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.
1. "Off" Position - everything is off.

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.
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.

2. "Lo Cool" Position - fan operates on low speed,
compressor is on.
3. "Med Cool" Position - fan operates on medium speed,
compressor is on.

Figure 27
System Control Panel
Heat Pump & Electric Heat Models
(YS, ES, YM, EM, YL & EL)

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

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.

1. "Off" Position - no continuity between terminals.

WARMER - Touch WARMER to see setting, touch again to
change.

2. "Lo Cool" Position - between terminals "C" and "3", "C2"
and "2", "LO" and "M/S", "AR" and "5".
3. "Med Cool" Position - between terminals "C" and "3", "C2"
and "2", "M" and "M/S", "AR" and "5".
4. "Hi Cool" Position - between terminals "C" and "3", "C2"
and "2", "H" and "M/S", "AR" and "5".
5. "Hi Heat" Position - between terminals "C" and "1", "C2"
and "4", "H" and "M/S", "AR" and "5".
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

Smart Center Electronic Control Center
(See Figure 29)
FILTER ALERT 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

Touch °F/°C to show desired temperature in Fahrenheit or
Celsius.
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.
TO ACTIVATE SMART FAN
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.

Figure 29
Electronic Control

TO SET HOUR CLOCK
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.)
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.
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.
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.
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.

TESTING THE ELECTRONIC CONTROL
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.
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.
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.
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.
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.
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.

THERMOSTAT ("SQ & KQ" Models) - See Figure 30.
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.
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.

Figure 30
Thermostat

Figure 31
Thermostat
(YQ Models Only)

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.
4. Turn thermostat knob counterclockwise to its warmest
position.
5. Test for continuity - contacts should be open.
NOTE: The thermostat must be within the temperature
range listed to open and close.
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. Thermostat malfunction or erratic operation is covered in the troubleshooting section of this manual.
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.
4. Turn thermostat knob counterclockwise to its warmest
position.
5. Test for continuity - contacts should be open.
NOTE: The thermostat must be within the temperature range
listed to open and close.

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.

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.) A current feedback through the fan motor windings
during "off cycle" completes the circuit to the resistor.

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.
RANGE:

Cooling Model Thermostat
60°F (±2°) to 92°F (±4°),

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
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)

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.

Figure 32
Thermostat

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.

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.
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 4way valve will not reverse.

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 35
Defrost Thermostat
(Heat Pump Models)

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

DEFROST BULB LOCATION (Heat Pump Models Only)
(See Figure 36)
The defrost control bulb must be mounted securely and in the
correct location to operate properly.

CAPACITOR, RUN (See Figure 38)
A run capacitor is wired across the auxiliary and main winding
of a single phase permanent split capacitor motor such as the
compressor and fan motor. A single 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)

Retainer

Figure 38
Dual Rated Run Capacitor Hook-up

Slide the bulb
end of the
thermostat
defrost under
the retainer as
shown

CAPACITOR - TEST
1. Remove capacitor from unit.

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:
115 Volt - 5,000 ohms 3 watt
230 Volt - 20,000 ohms 3 watt

Figure 37
Resistor

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.
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.
5. Repeat steps 3 and 4 to check fan motor capacitor.
NOTE: A shorted 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.
An open capacitor will show no movement of the pointer when
placed across the terminals of the capacitor.

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 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.
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.
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.

(TO OUTDOOR COIL)

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 refrigerant will also be directed through the cooling capillary tubes in
a continuous loop during the heating mode).

Figure 41

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.
COOLING MODE (See Figure 40)
In the cooling mode of operation, liquid refrigerant from condenser (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).

(TO INDOOR COIL)

(TO OUTDOOR COIL)

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.

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.
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.
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.

Figure 42
Reversing Valve

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.
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.
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.
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
cooling position or in the mid-position.
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.
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

NOTE: Do not start unit with solenoid coil removed from
valve, or do not remove coil after unit is in operation.
This will cause the coil to burn out.

Figure 43
Bellows Assembly
Drain Pan Valve

VALVE, DRAIN PAN (See Figure 43)
During the cooling mode of operation, condensate which
collects in the drain pan is picked up by the condenser fan
blade and sprayed onto the condenser coil. This assists in
cooling the refrigerant plus evaporating the water.
During the heating mode of operation, it is necessary that
water be removed to prevent it from freezing during cold
outside temperatures. This could cause the condenser fan
blade to freeze in the accumulated water and prevent it from
turning.
To provide a means of draining this water, a bellows type
drain valve is installed over a drain opening in the base pan.
This valve is temperature sensitive and will open when the
outside temperature reaches 40°F. The valve will close
gradually as the temperature rises above 40°F to fully close
at 60°F.
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.
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.
The heater element has a high limit control. This control is a
bimetal thermostat mounted in the top of the heating element.

Should the fan motor fail or filter become clogged, the high
limit control will open and interrupt power to the heater before
reaching an unsafe temperature condition.
The control is designed to open at 110°F ±6°F. Test continuity
below 110°F and for open above 110°F.
The heating element for the "Y" model is energized by an
outdoor thermostat. The outdoor thermostat is adjusted at a
predetermined temperature to bring on the heating element
and turn off the compressor. The room thermostat will then
control the cycling of the element when the selected indoor
temperature is reached.
Testing of the elements can be made with an ohmmeter across
the terminals after the connecting wires have been removed.
A cold resistance reading of approximately 14.5 ohms for the
3.3 KW heater, 11.9 ohms for the 4.0 KW heater and 9.15
ohms for the 5.2 KW heater should be registered.
SEALED REFRIGERATION SYSTEM REPAIRS
IMPORTANT
ANY SEALED SYSTEM REPAIRS TO HEAT PUMP
MODELS REQUIRES THE INSTALLATION OF A
SUCTION LINE DRIER IN THE SUCTION LINE
BETWEEN THE EVAPORATOR AND THE REVERSING
VALVE.

EQUIPMENT REQUIRED
1. Voltmeter
2. Ammeter
3. Ohmmeter
4. E.P.A. Approved Refrigerant Recovery System.

Figure 44 - Heating Element

5. Vacuum Pump (capable of 200 microns or less vacuum.)
6. Acetylene Welder
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%.
2. Evacuation from both the high side and low side of the
system simultaneously.

11.

3. Introducing refrigerant charge into high side of the system.
4. Accurately weighing the refrigerant charge actually introduced into the system.

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.
12.

5. Facilities for flowing nitrogen through refrigeration tubing during all brazing processes.

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.)

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.

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.

SPECIAL PROCEDURE IN THE CASE OF
COMPRESSOR MOTOR BURNOUT
1. Recover all refrigerant and oil from the system.
2.

Remove compressor, capillary tube and filter drier
from the system.

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%.

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.

Cut the process tube below pinch off on the suction
side of the compressor.

Reassemble the system, including new drier strainer
and capillary tube.

Connect the line from the nitrogen tank to the suction
process tube.

Proceed with processing as outlined under hermetic
component replacement.

Drift dry nitrogen through the system and un-solder the
more distant connection first. (Filter drier, high side
process tube, etc.)

Replace inoperative component, and always install a
new filter drier. Drift dry nitrogen through the system
when making these connections.

Pressurize system to 30 PSIG with proper refrigerant
and boost refrigerant pressure to 150 PSIG with dry
nitrogen.

Leak test complete system with electric halogen leak
detector, correcting any leaks found.

Reduce the system to zero gauge pressure.

Connect vacuum pump to high side and low side of
system with deep vacuum hoses, or copper tubing. (Do
not use regular hoses.)

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

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.
1.

Because of the spinning motion of the rotary, the
mounts are critical. If vibration is present, check the
mounts carefully.

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.

REFRIGERANT CHARGING
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.

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.
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.

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:
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 EPA regulations.

An overcharged unit will at times return liquid refrigerant
(slugging) back to the suction side of the compressor
eventually causing a mechanical failure within the compressor.
This mechanical failure can manifest itself as valve failure,
bearing failure, and/or other mechanical failure. The specific
type of failure will be influenced by the amount of liquid being
returned, and the length of time the slugging continues.
Not enough refrigerant (Undercharge) on the other hand, will
cause the temperature of the suction gas to increase to the
point where it does not provide sufficient cooling for the
compressor motor. When this occurs, the motor winding
temperature will increase causing the motor to overheat and
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.

3. Install a process tube to sealed system.
4. Make necessary repairs to system.
5. Evacuate system to 250 - 300 microns or less.
6. Weigh in refrigerant with the property quantity of R-22
refrigerant.
7. Start unit, and verify performance.
8. Crimp the process tube and solder the end shut.

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 EPA Regulations. THIS SHOULD ONLY BE ATTEMPTED BY QUALIFIED SERVICE PERSONNEL.

Undercharged Refrigerant Systems
An undercharged system will result in poor performance (low
pressures, etc.) in both the heating and cooling cycle.
Whenever you service a unit with an undercharge of
refrigerant, always suspect a leak. The leak must be repaired
before charging the unit.
To check for an undercharged system, turn the unit on, allow
the compressor to run long enough to establish working
pressures in the system (15 to 20 minutes).
During the cooling cycle you can listen carefully at the exit of
the metering device into the evaporator; an intermittent hissing
and gurgling sound indicates a low refrigerant charge.

Intermittent frosting and thawing of the evaporator is another
indication of a low charge, however, frosting and thawing can
also be caused by insufficient air over the evaporator.
Checks for an undercharged system can be made at the
compressor . If the compressor seems quieter than normal, it
is an indication of a low refrigerant charge. A check of the
amperage drawn by the compressor motor should show a
lower reading. (Check the Unit Specification.) After the unit
has run 10 to 15 minutes, check the gauge pressures.
Gauges connected to system with an undercharge will have
low head pressures and substantially low suction pressures.

NOTE: Heat pump
refrigeration
drawing

Overcharged Refrigerant Systems
Compressor amps will be near normal or higher.
Noncondensables can also cause these symptoms. To
confirm, remove some of the charge, if conditions improve,
system may be overcharged. If conditions don’t improve,
Noncondensables are indicated.
Whenever an overcharged system is indicated, always make
sure that the problem is not caused by air flow problems.
Improper air flow over the evaporator coil may indicate some
of the same symptoms as an overcharged system.

An over charge can cause the compressor to fail, since it would
be "slugged" with liquid refrigerant.
The charge for any system is critical. When the compressor
is noisy, suspect an overcharge, when you are sure that the
air quantity over the evaporator coil is correct. Icing of the
evaporator will not be encountered because the refrigerant
will boil later if at all. Gauges connected to system will usually
have higher head pressure (depending upon amount of
overcharge). Suction pressure should be slightly higher.

Restricted Refrigerant System
A quick check for either condition begins at the evaporator.
With a partial restriction, there may be gurgling sounds at the
metering device entrance to the evaporator. The evaporator
in a partial restriction could be partially frosted or have an ice
ball close to the entrance of the metering device. Frost may
continue on the suction line back to the compressor.
Often a partial restriction of any type can be found by feel, as
there is a temperature difference from one side of the restriction
to the other.
With a complete restriction, there will be no sound at the
metering device entrance. An amperage check of the
compressor with a partial restriction may show normal current
when compared to the unit specification. With a complete
restriction the current drawn may be considerably less than
normal, as the compressor is running in a deep vacuum (no
load.) Much of the area of the condenser will be relatively cool
since most or all of the liquid refrigerant will be stored there.
The following conditions are based primarily on a system in
the cooling mode.

Troubleshooting a restricted refrigerant system can be
difficult. The following procedures are the more common
problems and solutions to these problems. There are two
types of refrigerant restrictions: Partial restrictions and
complete restrictions.
A partial restriction allows some of the refrigerant to circulate
through the system.
With a complete restriction there is no circulation of refrigerant
in the system.
Restricted refrigerant systems display the same symptoms
as a "low-charge condition."
When the unit is shut off, the gauges may equalize very slowly.
Gauges connected to a completely restricted system will run
in a deep vacuum. When the unit is shut off, the gauges will
not equalize at all.

Routine Maintenance
NOTE: Units are to be inspected and serviced by qualified service personnel only.

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.

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.

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.

Inspect the surrounding area (inside and outside) to ensure that the units' clearances have not been compromised or
altered.

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.

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.

Troubleshooting Touch Test Chart: To Service Reversing Valves

Cool

Hot

Cool

RIGHT Pilot
Capillary Tube

LEFT Pilot
Capillary Tube

Tube to OUTSIDE
COIL

Hot

Tube to INSIDE
COIL

1
Normal
Cooling
Normal Heating

SUCTION TUBE
to Compressor

VALVE
OPERATING
CONDITION

DISCHARGE TUBE
from Compressor

NORMAL FUNCTION OF VALVE

Cool Hot *TVB
as (2) as (1)
Hot Cool *TVB
as (1) as (2)

NOTES:
* TEMPERATURE OF VALVE BODY
** WARMER THAN VALVE BODY

POSSIBLE CAUSES CORRECTIONS

TVB
TVB

MALFUNCTION OF VALVE
Check Electrical circuit and coil

Valve will
not shift
from cool to
heat.

Check refrigeration charge
Hot

Cool

Cool, Hot, *TVB
as (2) as (1)

Hot

No voltage to coil.
Defective coil.
Low charge.
Pressure differential too high.
Pilot valve okay. Dirt in one
bleeder hole.

Piston cup leak

Valve will
not shift
from cool to
heat.

Starts to
shift but
does not
complete
reversal.

Apparent
leap in
heating.

Cool,
as (2)
Cool,
as (2)

Hot, *TVB
as (1)
Hot,
Hot
as (1)

*TVB

Warm, *TVB
as (1)
Hot *TVB

Warm

Cool,
as (2)
Warm

Hot

Warm

Hot

*TVB

Hot

Hot,

Hot

Cool

Hot

Cool

Hot

Cool

Hot,
as (1)
Hot,
as (1)
Hot,
as (1)

Hot

Cool

Hot

Cool

Warm

Cool

Hot

Clogged pilot tubes.
Both ports of pilot open. (Back seat
port did not close).
Defective Compressor.
Not enough pressure differential at
start of stroke or not enough flow to
maintain pressure differential.
Body damage.
Both ports of pilot open.
Body damage.
Valve hung up at mid-stroke. Pumping
volume of compressor not sufficient to
maintain reversal.
Both ports of pilot open.

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.
Replace compressor
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.
Replace valve
Raise head pressure, operate solenoid. If no
shift, use valve with smaller ports.

Hot

Cool

Hot,
as (1)

Cool,
as (2)

Hot

*TVB

Dirt in bleeder hole.

Hot

Cool

Hot,
as (1)

Cool,
as (2)

Hot

*TVB

Piston cup leak.

Hot

Cool

Hot

Defective pilot.

Warm

Cool

Hot,
as (1)
Warm,
as (1)

Raise head pressure, operate solenoid. If no
shift, replace valve.
Operate valve several times, then recheck. If
excessive leak, replace valve.
Operate valve several times, then recheck. If
excessive leak, replace valve.
Stop unit. Will reverse during equalization
period. Recheck system
Raise head pressure, operate solenoid to free
dirt. If still no shift, replace valve.
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.
Replace valve.

Defective compressor.

Replace compressor

Cool, *TVB
as (2)
Cool,
**
as (2) WVB
Cool, *TVB
as (2)

*TVB

Piston needle on end of slide leaking.

**
WVB
*TVB

Pilot needle and piston needle leaking.
Pressure differential too high.
Clogged pilot tube.

Will not shift
from heat to
cool.

Repair electrical circuit.
Replace coil.
Repair leak, recharge system.
Recheck system.
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.
Stop unit. After pressures equalize, restart with
solenoid energized. If valve shifts, reattempt
with compressor running. If still no shift, replace
valve.

Cool, Hot
as (2)
Cool, Warm
as (2)

*TVB

Troubleshooting: Cooling
POSSIBLE CAUSE

PROBLEM

Low voltage.

Compressor does not
run.

Thermostat not set cold enough or
inoperative.
Compressor hums but cuts off on
overload.
Open or shorted compressor
windings.
Open overload.
Open capacitor.
Inoperative system switch.
Broken, loose or incorrect wiring.

PROBLEM

POSSIBLE CAUSE
Inoperative system switch.
Broken, loose or incorrect wiring.
Open Capacitor.
Fan speed switch open.
Inoperative fan motor.

Fan motor
does not run.

PROBLEM

POSSIBLE CAUSE
Undersized unit.
Thermostat open or inoperative.

Does not cool, or cools
only slightly.

PROBLEM

Unit does not run.

Dirty filter.
Dirty or plugged condenser or
evaporator coil.
Poor air circulation in area being
cooled.
Fresh air or exhaust air door open
on applicable models.
Low capacity – undercharge.
Compressor not pumping properly.

TO CORRECT
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.
Hard start compressor. Direct test compressor. If
compressor starts, add starting components.
Check for continuity and resistance.
Test overload protector and replace if inoperative.
Test capacitor and replace if inoperative.
Test for continuity in all positions. Replace if
inoperative.
Refer to appropriate wiring diagram to check wiring.

TO CORRECT
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.)

TO CORRECT
Refer to Sizing Charts.
Set to coldest position. Test thermostat and
replace if necessary.
Clean as recommended in Owner’s Manual.
Use steam or detergents to clean.
Adjust discharge air louvers. Use high fan
speed.
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.

TO CORRECT
Replace fuse, reset breaker. If repeats, check fuse
Fuse blown or circuit tripped.
or breaker size. Check for shorts in unit wiring and
components.
Power cord not plugged in.
Plug in power cord
System switch in "Off" position.
Set switch correctly.
Inoperative system switch.
Test for continuity in each switch position.
Loose or disconnected wiring at switch or Check wiring and connections. Reconnect per wiring
other components.
diagram.

PROBLEM

Evaporator coil
freezes up.

PROBLEM

POSSIBLE CAUSE
Dirty filter.
Restricted air flow.
Inoperative thermostat.
Short of refrigerant.
Inoperative fan motor.
Partially restricted capillary.

POSSIBLE CAUSE

Thermostat incorrectly wired.

TO CORRECT:
Unit undersized. Test cooling performance of unit.
Replace with larger unit.
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.
Check operation of thermostat. Replace if contacts
remain closed.
Refer to appropriate wiring diagram.

POSSIBLE CAUSE

TO CORRECT:

Excessive heat load.
Compressor runs
continually.

Restriction in line.
Refrigerant leak.

Does not cycle off.
Thermostat contacts stuck

PROBLEM
Thermostat does not
turn unit off.

Thermostat contacts stuck.
Thermostat set at coldest point.
Incorrect wiring.
Unit undersized for area to be cooled.

PROBLEM

TO CORRECT

Overload inoperative. Opens too soon.

Restricted or low air flow through
condenser coil.
Compressor running abnormally hot.

Check operation of unit. Replace overload if
system operation is satisfactory.
Allow a minimum of two (2) minutes for pressures
to equalize before attempting to restart. Instruct
customer of waiting period.
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.
Check for proper fan speed or blocked condenser.
Check for kinked discharge line or restricted condenser.
Check amperage.

POSSIBLE CAUSE

TO CORRECT

Loss of charge in thermostat bulb.

Place jumper across thermostat terminals to check
if unit operates. If unit operates, replace thermostat.

Loose or broken parts in thermostat.
Incorrect wiring.

Check as above.
Refer to appropriate wiring diagram.

Low or fluctuating voltage.

PROBLEM

Replace thermostat.
Turn to higher temperature setting to see if the unit
cycles off.
Refer to appropriate wiring diagram.
Refer to Sizing Chart.

POSSIBLE CAUSE
Compressor attempts to start before
system pressures are equalized.

Compressor attempts
to start, or runs for
short periods only.
Cycles on overload.

TO CORRECT
Clean as recommended in Owner’s Manual.
Check for dirty or obstructed coil - clean as required.
Test for shorted thermostat or stuck contacts.
De-ice coil and check for leak.
Test fan motor and replace if inoperative.
De-ice coil. Check temperature differential across
coil. Touch test coil return bends for same temperature. Test for low running current.

Incorrect wiring.
Shorted or incorrect capacitor.

Thermostat does not
turn unit on.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Poorly installed unit.

Improperly mounted or loose cabinet
parts.

Refer to Installation Instructions for proper
installation.
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.
Check assembly and parts for looseness,
rubbing and rattling.

POSSIBLE CAUSE

TO CORRECT

Evaporator drain pan overflowing.
Condensation forming on base pan.

Clean obstructed drain trough.
Evaporator drain pan broken or cracked. Reseal or
replace.
Check Installation Instructions. Reseal as required.

Fan blade striking chassis.
Noisy operation.

PROBLEM

Water leaks into room.

PROBLEM
Thermostat short
cycles.

PROBLEM

Prolonged off-cycles.
(automatic operation)

Compressor vibrating.

Poor installation resulting in rain
entering room.
Condensation on discharge grilles.

POSSIBLE CAUSE

TO CORRECT

Thermostat differential too narrow.
Plenum gasket not sealing, allowing
discharge air to short cycle thermostat.
Restricted coil or dirty filter.

Replace thermostat.
Check gasket. Reposition or replace.

Tubular insulation missing from top of
thermostat bulb.
Thermostat bulb touching thermostat
bulb support bracket.

Clean and advise customer of periodic cleaning of
filter.
Replace tubular insulation on bulb.
(Applicable models.)
Adjust bulb bracket.
(Applicable models.)

POSSIBLE CAUSE

TO CORRECT

Anticipator (resistor) wire disconnected
at thermostat or system switch.
Anticipator (resister shorted or open).
(Applicable models.)

Refer to appropriate wiring diagram.

Partial loss of charge in thermostat
bulb causing a wide differential.

PROBLEM
Switches from
cooling to heating.

Dirty evaporator coil - clean.
Very high humidity level.

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.
Replace thermostat.

POSSIBLE CAUSE

TO CORRECT

Thermostat sticking.
Incorrect wiring.

Change room thermostat.
Refer to appropriate wiring diagram.

PROBLEM
Outside water leaks.

POSSIBLE CAUSE

TO CORRECT

Evaporator drain pan cracked or
obstructed.
Water in compressor area.

Repair, clean or replace as required.

Obstructed condenser coil.
Fan blade and slinger ring improperly
positioned.

PROBLEM

High indoor
humidity.

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.

POSSIBLE CAUSE

TO CORRECT

Insufficient air circulation in air conditioned area.
Oversized unit.

Adjust louvers for best possible air circulation

Inadequate vapor barrier in building
structure, particularly floors.

Advise customer.

Operate in "Fan-Auto (MoneySaver)" position.

Troubleshooting: Heating (Heat pumps)
PROBLEM

POSSIBLE CAUSE

TO CORRECT

Thermostat setting.
Defective thermostat.
Compressor not operating.
Defective system switch.

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

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Insufficient heating.

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.

No heating — fan
operates.

Fresh air or exhaust door open.
PROBLEM
Fan operates in
"constant" position, but
not in "automatic"
(MoneySaver).
PROBLEM

POSSIBLE CAUSE

TO CORRECT

Inoperative system switch.

Check continuity of switch.

Incorrect wiring.

Check applicable wiring diagram.

POSSIBLE CAUSE

TO CORRECT

Defective thermostat.
Temperature varies from Heat anticipator (resistor) shorted.
comfortable to overly
(Applicable models)
warm.

PROBLEM

Room temperature
uneven.
(Heating cycle)

PROBLEM

Unit will not defrost.

POSSIBLE CAUSE
Heat anticipator (resistor) shorted.
(Applicable models.)

Wide differential — partial loss of thermostat bulb charge.
Incorrect wiring.

POSSIBLE CAUSE
Incorrect wiring.
Defrost control timer motor not advancing.
Defrost control out of calibration.

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.
TO CORRECT
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.
Replace thermostat and check.
Refer to appropriate wiring diagram. Resistor is
energized during the "on" cycle of compressor or
fan.

TO CORRECT
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.
Defrost control contacts stuck.
If the contacts remain closed between terminals "2"
and "3" of the defrost control after preselected time
interval has passed, replace control.
Defrost control bulb removed from coil, Reinstall and assure that good bulb to coil contact is
or not making good coil contact.
made.

PROBLEM
Unit does not heat
adequately.

PROBLEM

Unit cools when
heat is called for.

POSSIBLE CAUSE

Outdoor thermostat does not cut off
Defective thermostat - replace.
compressor at the preselected temperature and bring on heating element.
Fresh air or exhaust door open.
Check if operating properly. Instruct customer
on proper use of control.
Dirty filter.
Clean as recommended in Owner’s Manual.
Unit undersized.
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.

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.
Check for continuity of system switch.

Inoperative system switch.
PROBLEM

Unit does not heat
adequately.

POSSIBLE CAUSE
Outdoor thermostat does not cut off
compressor at the preselected temperature and bring on the heating element.

TO CORRECT
Defective thermostat — replace.

Fresh air or exhaust door open.

Check if operating properly. Instruct customer on
proper use of control.
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.

Dirty filter.
Unit undersized.

PROBLEM
Unit cools when
heat is called for.

POSSIBLE CAUSE
Incorrect wiring.
Defective solenoid coil.
Reversing valve fails to shift.
Inoperative system switch.

PROBLEM

Cooling is adequate, but heating
is insufficient.

TO CORRECT

POSSIBLE CAUSE
Heating capillary tube partially
restricted.
Check valve leaking internally.
Reversing valve failing to shift
completely — bypassing hot gas.

TO CORRECT
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.
TO CORRECT
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, energize solenoid to break loose. If valve fails to make
complete shift, replace valve.

PROBLEM
Compressor will not turn
off and operate on heating
element only during low
outside ambients.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

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.

POSSIBLE CAUSE
Fuse link.

TO CORRECT
Check fuse link for continuity. If defective, replace.

Compressor shuts off on
Heating element shorted.
outdoor thermostat but
element does not heat. Incorrect wiring.

Check amperage draw of element. If no amperage,
replace.
Check voltage to element. If voltage is okay, check
wiring.

Troubleshooting: Heating (Cooling/Electric Models)
PROBLEM

Fan Operates –
heating element does
not come on.

POSSIBLE CAUSE
Heater relay or contactor coil open.
Heater relay or contactor stuck open,
pitted or burned.
High limit control open.
Open thermal fuse.
Open or shorted element.
Loose connections.

PROBLEM

POSSIBLE CAUSE
Restricted filter.
Cycling high limit control.

Heating inadequate.

PROBLEM

POSSIBLE CAUSE
Fan relay contacts open.

TO CORRECT

POSSIBLE CAUSE
Heat anticipator (resistor) shorted.

Defective thermostat.

Fan motor does not
operate in "Constant"
or "MoneySaver"
position.

PROBLEM

Cooling adequate,
heating insufficient.

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.
Check position of fresh air door control slide. Adjust
cable if door does not close properly.

Long "off" and "on"
cycles.

PROBLEM

Check continuity – if open, replace.
Check continuity. Check reason for failure.
Check voltage across heater terminals. Check
amperage draw of heater.
Tighten all terminals.

Exhaust or fresh air door open.

Fan operates in "Constant" position, but not in
Inoperative system switch.
"Automatic" (MoneySaver).
Loose connection.

PROBLEM

TO CORRECT
Check continuity of coil.
Inspect, test continuity with ohmmeter.

Check continuity of fan relay. NOTE: Some models
have the fan relay energized during the heating
cycle while others do not.
Check continuity between terminals "L2" and "3" of
the system switch.
Check connections on system switch and fan relay.

TO CORRECT
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.
Replace thermostat and check operation.

POSSIBLE CAUSE

TO CORRECT

Defective motor.
Open or shorted capacitor.
Condenser fan frozen to base pan.
Loose connections.

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.

POSSIBLE CAUSE

TO CORRECT

Heating capillary tube partially restricted.

Check for partially starved outer coil. Replace
heating capillary tube.
Switch unit several times from heating to cooling.
Check temperature rise across coil. Refer to specification 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.

Reversing valve failing to shift
completely – bypassing hot gas.

PROBLEM

POSSIBLE CAUSE

TO CORRECT

Compressor will not
turn off and operate on
heating element only
during low outside
ambients.

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.

Troubleshooting Chart — Cooling
REFRIGERANT SYSTEM
DIAGNOSIS COOLING

Low Suction Pressure

High Suction Pressure

Low Head Pressure

High Head Pressure

Low Load Conditions

High Load Conditions

Low Load Conditions

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

Overcharged

Undercharged

Overcharged

Undercharged
in System

Noncondensables (air)

Moisture in System

Defective Compressor

Troubleshooting Chart — Heating
REFRIGERANT SYSTEM
DIAGNOSIS – HEATING
Low Suction Pressure

High Suction Pressure

High Head Pressure

Low Head Pressure

Low Airflow
Across Outdoor Coil

Outdoor Ambient Too High
for Operation in Heating

Refrigerant System
Restriction

Reversing Valve not
Fully Seated

Low Airflow Across
Indoor Coil

Undercharged

Overcharged

Undercharged

Overcharged

Moisture in System

Defective Compressor

Noncondensables (air) in
System

Outdoor Ambient Too High
For Operation In Heating

Electrical Troubleshooting Chart
(Heat Pump)
HEAT PUMP
SYSTEM COOLS WHEN
HEATING IS DESIRED.

Is Line Voltage
Present at the Solenoid
YES
Is the Solenoid Coil Good?

Is the Selector Switch
Set for Heat?

Replace the Solenoid Coil

YES
Reversing Valve Stuck

Replace the Reversing Valve

MODELS
RS10J10C, RS12J10A-B, RS15J10A, RS16J30A-A, RS18J30A, RM24J30-A

COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REFER TO
MARKINGS ON
COMPRESSOR

RED
BLUE

BLACK

OVERLOAD
PROTECTOR

PURPLE
BROWN

RED

BLUE
RED

ALTERNATE
COMPRESSOR

SWITCH
SYSTEM
2

BLUE

C
S

WIRING DIAGRAM

COMPRESSOR

BLACK

BLUE

ORANGE

RED

MEDIUM

LOW

LOW LOW

HIGH

BLACK
OR WHITE

SMOOTH CONDUCTOR
OR BROWN

3
2
1

RED

GREY

CAPACITOR
WHITE
BLACK
BLUE
ORANGE
RED

BROWN
HER

FAN

TO CAPACITOR
BRACKET

THERMOSTAT

BLACK

ANTICIPATOR
RESISTOR

BLACK

RED

SWITCH,
ROCKER (GE)

BLUE

COMPRESSOR
WIRE HARNESS

BLUE
GREEN

SUPPLY CORD

GREEN

RIBBED CONDUCTOR
OR BLUE

FAN
MOTOR

OR GREEN/YELLOW
TO INNERWALL/
MOTOR MOUNT

GREEN
OR GREEN/YELLOW

TO CHASSIS

TO CAPACITOR
BRACKET

SCHEMATIC

L1
AR

IDT

OVLD

COMPR
HERM

CAP

2
2

MS
3

HIGH

H
3

YES
2

R
MEDIUM

OVLD
MTR

4
1

LOW

FAN

CAP

5
LL
6

SYS SW

SWITCH LOGIC

X = CLOSED
0 = OPEN

SWITCH POSITION
OFF
LOW COOL
MED COOL
HI COOL
FAN ONLY
LL COOL

1
O
X
X
X
O
X

CIRCUIT
2 3 4
O O O
O O O
O O X
O X O
X O O
O O O

LEGEND
5
O
X
O
O
O
O

6
O
O
O
O
O
X

AR
MS
CAP
COMPR

- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
- CAPACITOR
- COMPRESSOR

MTR
OVLD

- FAN MOTOR
- OVERLOAD PROTECTOR

SYS SW
IDT

- INDOOR THERMOSTAT

- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

- SYSTEM SWITCH

PART NO.
619-405-00

REV
00

MODELS
SQ06J10B-B, SQ06J10B-A, SQ08J10C-A, SQ08J10D-A

WIRING DIAGRAM

RED
PURPLE

COMPRESSOR
BLUE

C
L1

BLUE

"F"

"F"
"F"

M L

SWITCH
SYSTEM

THERMOSTAT

GREY

WHITE

RED

ANTICIPATOR
RESISTOR

OPTIONAL
CONFIGURATION

SUPPLY CORD

BLACK

SWITCH
ROCKER (GE)

BLACK

BLUE

HARNESS, COMPR.

RED

NOTE:

SMOOTH
CONDUCTOR

BLUE

BROWN

RED

WHITE

GREEN

CAPACITOR
RED

TO CAPACITOR
BRACKET

BLUE

FAN

BLACK

BLUE

RIBBED CONDUCTOR

BROWN

TO INNERWALL/
MOTOR MOUNT
GREEN

FAN
MOTOR

SCHEMATIC

L1
AR

IDT

OVLD

COMPR
HERM

CAP

2
2

MS
3

HIGH

H
3

NO
2

R
MEDIUM

OVLD
MTR

4
1

YES

LOW

FAN

CAP

SYS SW

SWITCH LOGIC

X = CLOSED
0 = OPEN

SWITCH POSITION

OFF
LOW COOL
MED COOL
HI COOL
FAN ONLY

LEGEND

CIRCUIT
1
O
X
X
X
O

2
O
O
O
O
X

3
O
O
O
X
O

4
O
O
X
O
O

5
O
X
O
O
O

AR
MS
CAP
COMPR

- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
- CAPACITOR
- COMPRESSOR

MTR
OVLD

- FAN MOTOR
- OVERLOAD PROTECTOR

SYS SW
IDT

- SYSTEM SWITCH
- INDOOR THERMOSTAT

- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

PART NO.
619-142-15

REV.
01

MODELS
KQ05J10B-B, KQ05E10-C KQ06J10B-A, KQ06J10B-B, KQ06E10-A, KQ06E10-B

WIRING DIAGRAM

PTCR
(OPTIONAL)

CAPACITOR
RED

FAN MOTOR

BLACK

FAN

WHITE

WIRE HARNESS

BROWN
BLACK

RED

HERM

BLACK

BLUE

RIBBED (OR BLUE) CONDUCTOR

RED

COMPRESSOR

BLACK

THERMOSTAT
BLACK

H C

BLACK

SYSTEM SWITCH

GREEN/YELLOW

SMOOTH (OR BROWN) CONDUCTOR

SEE DETAIL " A "

TO GND
SCREW

SUPPLY CORD

DETAIL " A " OPTIONAL WIRING
RED
BLACK

SYSTEM SWITCH SEQUENCE
BLK

CW ROT

CONNECTION

OFF

ALL OPEN

HI FAN
LO FAN
LO COOL
HI COOL

L1-H
L1-L
L1-L,L1-C
L1-H,L1-C

ANTI-ICE
CONTROL

BLK

H C

SYSTEM SWITCH

WHITE

THERMOSTAT

DETAIL " B " OPTIONAL SCHEMATIC

SCHEMATIC

RED

ANTI-ICE
CONTROL

T\STAT

BLACK

LINE

SYSTEM SWITCH

RED

T/STAT

SEE DETAIL "B"

BLACK
FAN MOTOR

OLVD

CAPACITOR
BROWN

H
PTCR (OPTIONAL)

COMPRESSOR

WHITE

R
LINE
LEGEND:

RIBBED CONDUCTOR
= OPTIONAL FACTORY WIRING

PTCR = START ASSIST DEVICE

PART NO.
619-046-01

REV.
01

MODELS
KQ08J10B-1, KQ08J10B-A, KQ08J10C-A

WIRING DIAGRAM
WIRE HARNESS
R S
C

CAPACITOR

PTCR
(OPTIONAL)

RED

BLACK
R

FAN

04
1

FAN MOTOR

WHITE

BROWN
BLUE

NOTE:
BLACK

OPTIONAL
CONFIGURATION

RED

HERM

BLACK

BLUE
RED
BLACK

BLUE

THERMOSTAT
2

BLK

L
1

H C

BLACK

GREEN

SYSTEM SWITCH

BROWN

SEE DETAIL " A "

TO GND
SCREW

SUPPLY CORD

DETAIL " A " OPTIONAL WIRING
RED

BLACK

SYSTEM SWITCH SEQUENCE
2

CW ROT

CONNECTION

OFF

ALL OPEN

HI FAN
LO FAN
LO COOL
HI COOL

L1-H
L1-L
L1-L,L1-C
L1-H,L1-C

LINE

ANTI-ICE
CONTROL

BLK
BLK OR

BLK OR
RED

RED

H C

SYSTEM SWITCH

BROWN

THERMOSTAT

DETAIL " B " OPTIONAL SCHEMATIC

SCHEMATIC
RED

ANTI-ICE
CONTROL

T/STAT

BLACK

SYSTEM SWITCH

RED

T\STAT

SEE DETAIL "B"

BLACK
FAN MOTOR

OLVD

CAPACITOR
BRN

H
PTCR (OPTIONAL)

COMPRESSOR

WHITE

R
LINE
LEGEND:

BLUE
= OPTIONAL FACTORY WIRING

PTCR = START ASSIST DEVICE

PART NO.
617-581-04

REV.
04

MODELS
XQ05J10-B, XQ06J10-A, XQ06J10-B, XQ08J10-1, XQ08J10-A, XQ08J10A-A

SMOOTH CONDUCTOR
OR BROWN

RELAY

BLACK

RELAY

BLUE

COM

RELAY

RED

RIBBED CONDUCTOR

BLACK
WHITE
WHITE

CAPACITOR

RED
BLUE
BLACK

BROWN

RED

SUPPLY CORD

HIGH

MEDIUM

LOW

BLACK

COMPRESSOR
WIRE HARNESS

GREEN OR
GREEN/YELLOW

OVERLOAD
PROTECTOR

BLACK

WIRING DIAGRAM

TRANSFORMER

WHITE

RED

BLUE

ELECTRONIC CONTROL

TO CAPACITOR
BRACKET

HER
M

FAN

OR BLUE

COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REFER TO
MARKINGS ON
COMPRESSOR

COMPRESSOR

MOTOR WIRE
HARNESS

BLUE

GREEN

TO CAPACITOR
BRACKET

GREEN OR
GREEN/YELLOW
TO INNERWALL/
MOTOR MOUNT

TO CHASSIS

FAN
MOTOR

SCHEMATIC

NEUTRAL

(115 V)

HIGH
1
R

MEDIUM
2

MTR

OVLD
LOW
S

FAN

CAP

OVLD
NO

COM

COMPR

ELECTRONIC CONTROL

SWITCH LOGIC

OFF
HI COOL
MED COOL
LOW COOL

CAP

X = CLOSED
O = OPEN

SWITCH POSITION

HERM

LEGEND

CIRCUIT
1
O
X
O
O

2
O
O
X
O

3
O
O
O
X

4
O
O
O
O

5
O
X
X
X

CAP
COMPR

- CAPACITOR
- COMPRESSOR

MTR
OVLD

- FAN MOTOR
- OVERLOAD PROTECTOR

- COMBINATION TERMINAL
- GROUND LEAD

PART NO.
619-142-14

REV.
03

MODEL
YQ06J10B-A
BLACK
RED

WIRING DIAGRAM

PTCR
(OPTIONAL)

BLUE

RED

BLACK

BLUE

BLACK

CAPACITOR
RED

RED

RIBBED (OR BLUE) CONDUCTOR

WHITE

FAN

(HARNESS, COMPR. MOLDED)

BROWN

BLACK

SOLENOID

BLUE

RED

HERM

BLUE

DEFROST CONTROL

BLACK

WHITE

RED

FAN MOTOR

COMPRESSOR

RED
BLACK

BLACK

WHITE

1
3

SYSTEM SWITCH

THERMOSTAT

GREEN

BLUE

SMOOTH (OR BROWN) CONDUCTOR
TO GND
SCREW

BLUE

SUPPLY CORD

SCHEMATIC
LINE
SYSTEM

SWITCH

THERMOSTAT
1

LOW
HIGH

COMPRESSOR
S

SOLENOID

FAN OVERLOAD

C' OVLD.
FAN MOTOR
2

DEFROST CONTROL T/STAT.
H

F
1

PTCR (OPTIONAL)

RUN CAPACITOR

SWITCH LOGIC

X = CLOSED
O = OPEN

LEGEND

CIRCUIT

SWITCH POSITION

OFF
HI-FAN
HI-COOL
LO-COOL
LO-HEAT
HI-HEAT

LINE

1
O
X
X
O
O
X

2
O
O
O
X
X
O

3
O
O
X
X
O
O

4 5
O O
O O
O O
O O
X O
X O

CAP
COMPR

- CAPACITOR
- COMPRESSOR

MTR
OVLD

- FAN MOTOR
- OVERLOAD PROTECTOR

SYS SW
IDT

- INDOOR THERMOSTAT

PTCR

- START ASSIST DEVICE

- OPTIONAL FACTORY WIRING
- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

- SYSTEM SWITCH

PART NO.
617-581-11

REV.
00

MODEL: SC06H10D

MODELS
SS08J10R-B, SS08J10R-A, SS09J10C-A, SS10J10AR-A,
SS12J10AR-B, SS14J10R-A, SS12J30D-A, SS16J30A-A,
SS18J30R-A, SM20J30-A, SM24J30-A

WHITE

TRANSFORMER

RED
BLACK

ALTERNATE
COMPRESSOR

NO
COM

BLACK
RELAY

BLUE

COMPRESSOR
WIRE HARNESS
BLACK

RELAY

ORANGE
ROOM
SENSOR

RED

RELAY

RIBBED CONDUCTOR

DEFROST
SENSOR

ELECTRONIC CONTROL

CAPACITOR

WHITE
WHITE
BROWN

SUPPLY CORD

RELAY

RED
ORANGE
BLUE
BLACK

RED

GREEN OR
GREEN/YELLOW

BLACK

OVERLOAD
PROTECTOR

SMOOTH CONDUCTOR
OR BROWN

BLUE

RED

BLUE

C
S

WIRING DIAGRAM

TO CAPACITOR
BRACKET

HER

FAN

OR BLUE

COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REFER TO
MARKINGS ON
COMPRESSOR

COMPRESSOR

BLUE

GREEN

TO CAPACITOR
BRACKET

GREEN OR
GREEN/YELLOW
TO INNERWALL/
MOTOR MOUNT

TO CHASSIS

FAN
MOTOR

NEUTRAL

SCHEMATIC

(115 V)
(230/208)

HIGH
F4
R

MEDIUM
F3

MTR

OVLD
LOW
S

FAN

CAP

SLEEP
F1

L1
R

OVLD
NO

COM

COMPR

5
S

ELECTRONIC CONTROL

SWITCH LOGIC

CAP

X = CLOSED
O = OPEN

LEGEND

CIRCUIT

SWITCH POSITION
OFF
HI COOL
MED COOL
LOW COOL
SLEEP

HERM

1
O
X
O
O
O

2
O
O
X
O
O

3
O
O
O
X
O

4
O
O
O
O
X

5
O
X
X
X
X

CAP
COMPR

- CAPACITOR
- COMPRESSOR

MTR
OVLD

- FAN MOTOR
- OVERLOAD PROTECTOR

- COMBINATION TERMINAL
- GROUND LEAD

PART NO.
619-405-06

REV.
01

MODELS
SL28J30B-A, SL35J30-A, SL35J30-B

COMPRESSOR

BLUE

RED
RED

PURPLE

BLACK

SYSTEM SWITCH

ALTERNATE
COMPRESSOR

C
BLUE

OVERLOAD
PROTECTOR

"F"

BLUE
H

C
"F"

WIRING DIAGRAM

COMPRESSOR TERMINAL
ORIENTATION MAY VARY. REFER
TO MARKING ON COMPRESSOR.

C
S

M L

CAPACITOR

THERMOSTAT

ORANGE

WHITE
BROWN

BLUE

SUPPLY CORD

RIBBED CONDUCTOR

GREEN

TO CAPACITOR
BRACKET
TO CHASSIS
GREEN OR
GREEN/YELLOW

FAN
MOTOR

TO INNERWALL/
MOTOR MOUNT

BLUE

OR BLUE
GREEN OR
GREEN/YELLOW

HER

FAN

BLUE
BLACK

OR BROWN

BLACK

RED

BLACK

BLACK OR WHITE

SMOOTH CONDUCTOR

ROCKER SWITCH (GE)

BLUE

3
2
1

GREY
RED

ANTICIPATOR
RESISTOR

ORANGE

BLUE

BROWN
HARNESS,
COMPRESSOR
MOLDED

SCHEMATIC

TO CAPACITOR
BRACKET

L1
AR

IDT

OVLD

COMPR
HERM

CAP

2
2

MS
1

HIGH

H
3

NO
2

R
MEDIUM

OVLD
MTR

4
3

YES

LOW

FAN

CAP

SYS SW

SWITCH LOGIC

X = CLOSED
0 = OPEN

SWITCH POSITION

OFF
LOW COOL
MED COOL
HI COOL
FAN ONLY

LEGEND

CIRCUIT
1
O
X
X
X
O

2
O
O
O
O
X

3
O
O
O
X
O

4
O
O
X
O
O

5
O
X
O
O
O

AR
MS
CAP
COMPR

- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
- CAPACITOR
- COMPRESSOR

MTR
OVLD

- FAN MOTOR
- OVERLOAD PROTECTOR

SYS SW
IDT

- INDOOR THERMOSTAT

- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

- SYSTEM SWITCH

PART NO.
619-405-01

REV.
00

MODELS
KS10E10-A, KS10J10-B, KS12E10-A, KS12J10B-A, KS15J10-A,
KS12J30B-A, KS18J30-A, KM20J30-A, KM24J30-A

COMPRESSOR

BLUE

RED
RED

PURPLE

BLACK

SYSTEM SWITCH

ALTERNATE
COMPRESSOR

C
BLUE

OVERLOAD
PROTECTOR

"F"

BLUE
H

C
"F"

WIRING DIAGRAM

COMPRESSOR TERMINAL
ORIENTATION MAY VARY. REFER
TO MARKING ON COMPRESSOR.

C
S

M L

CAPACITOR

THERMOSTAT

ORANGE

WHITE
BROWN

BLUE

SUPPLY CORD

RIBBED CONDUCTOR

GREEN

TO CAPACITOR
BRACKET
TO CHASSIS
GREEN OR
GREEN/YELLOW

FAN
MOTOR

TO INNERWALL/
MOTOR MOUNT

BLUE

OR BLUE
GREEN OR
GREEN/YELLOW

HER

FAN

BLUE
BLACK

OR BROWN

BLACK

RED

BLACK

BLACK OR WHITE

SMOOTH CONDUCTOR

ROCKER SWITCH (GE)

BLUE

3
2
1

GREY
RED

ANTICIPATOR
RESISTOR

ORANGE

BLUE

BROWN
HARNESS,
COMPRESSOR
MOLDED

SCHEMATIC

TO CAPACITOR
BRACKET

L1
AR

IDT

OVLD

COMPR
HERM

CAP

2
2

MS
1

HIGH

H
3

NO
2

R
MEDIUM

OVLD
MTR

4
3

YES

LOW

FAN

CAP

SYS SW

SWITCH LOGIC

X = CLOSED
0 = OPEN

SWITCH POSITION

OFF
LOW COOL
MED COOL
HI COOL
FAN ONLY

LEGEND

CIRCUIT
1
O
X
X
X
O

2
O
O
O
O
X

3
O
O
O
X
O

4
O
O
X
O
O

5
O
X
O
O
O

AR
MS
CAP
COMPR

- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
- CAPACITOR
- COMPRESSOR

MTR
OVLD

- FAN MOTOR
- OVERLOAD PROTECTOR

SYS SW
IDT

- INDOOR THERMOSTAT

- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

- SYSTEM SWITCH

PART NO.
619-405-01

REV.
00

MODELS
ES12J33B-A, ES16J33A-A, EM18J34B-A, EL25J35-A, EL35J35-B, EK18J34A

WIRING DIAGRAM
RED
BLUE

COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REFER TO
MARKINGS ON
COMPRESSOR

BLACK

RED
BLUE
YELLOW

3
1
C

L C2

BLACK

OVERLOAD
PROTECTOR

GRAY

WHITE

BLACK
PINK
BLACK

ORANGE
PURPLE
BLUE

WHITE

WHITE
BLACK
BLUE
ORANGE
BROWN

FAN
MOTOR

PURPLE

ORANGE

RED
RED
BLUE

RED

HE
RM

FAN

GREEN OR
GREEN/
YELLOW

3
2

ROCKER SWITCH
(GE)

GREEN OR
GREEN/YELLOW
TO INNERWALL/
MOTOR MOUNT

BLACK OR WHITE

ANTICIPATOR
RESISTOR

PINK

SMOOTH CONDUCTOR
OR BROWN

ORANGE

BROWN

RED

BLUE

TO CAPACITOR
BRACKET

BROWN
CAPACITOR
HEATER

TO CHASSIS

SCHEMATIC

L1
1

MEDIUM

MS
1

NO
2

3 YES

IDT

BLUE

GRAY

RIBBED CONDUCTOR
OR BLUE
GREEN

TO CAPACITOR
BRACKET

COMPRESSOR
WIRE HARNESS
S

SUPPLY
CORD

COMPRESSOR

BLUE

3
1

RED

ALTERNATE

SYSTEM SWITCH

THERMOSTAT

BLUE

BLUE
RED

BLACK

BROWN

WHITE

YELLOW

BLACK
ORANGE

YELLOW

HIGH

OVLD
MTR
C

FAN

LOW

CAP
R

C
C

1
7

COMPR

OVLD

HERM

CAP

TF
HTR

SYS SW
SWITCH LOGIC
SWITCH POSITION
OFF
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY

X = CLOSED
0 = OPEN
CIRCUIT
1 2 3 4 5 6 7 8 9 10
OOOOOOOOOO
OOOXXOXOXO
OXOOXOXOXO
OOXOXOXOXO
OOXOOXOXOX
OXOOOXOXOX
OOOXOXOXOX
XOOOOOOOOO

LEGEND
AR
MS
CAP
COMPR
MTR
OVLD

- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
- CAPACITOR
- COMPRESSOR
- FAN MOTOR
- OVERLOAD PROTECTOR

SYS SW
IDT

- INDOOR THERMOSTAT

- SYSTEM SWITCH

HTR
HL
TF

- HEATER
- HEATER LIMIT
- THERMAL FUSE
- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

PART NO.
619-405-02

REV.
00

MODELS
YS12J33-A, YM18J34B-A, YL24J35C-A

RED
BLUE

SYSTEM SWITCH
MS

COMPRESSOR

BLUE
BROWN

L C2

WHITE

C AR

RED
BLACK

GRAY

BLACK
PINK
BLACK
BLACK

ORANGE
PURPLE
BLUE

WHITE

YELLOW

OVERLOAD
PROTECTOR
WHITE
BLACK
BLUE
ORANGE
BROWN

BLACK

FAN
MOTOR

PURPLE

c
FAN

TO CAPACITOR
BRACKET

RED

HE
RM

GREEN OR
GREEN/
YELLOW

GREEN

ORANGE
RED
RED
BLUE

RIBBED CONDUCTOR OR BLUE

GREEN OR
GREEN/YELLOW
TO INNERWALL/
MOTOR MOUNT

ROCKER SWITCH
(GE)

3
2

ANTICIPATOR
RESISTOR

BLUE
BLACK OR WHITE
PINK

SMOOTH CONDUCTOR OR BROWN

BLUE

SUPPLY
CORD

DEFROST
THERMOSTAT
BLACK
3
ORANGE

COMPRESSOR
WIRE HARNESS
S

GRAY

ALTERNATE

YELLOW

RED

BLUE
3

3
1

BLUE

BLUE
RED

REVERSING
VALVE ASY

THERMOSTAT

COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REFER TO
MARKINGS ON
COMPRESSOR

BLACK

BROWN

WHITE

BLACK

RED
BLUE

WIRING DIAGRAM

BROWN
CAPACITOR

HEATER

TO CHASSIS

SCHEMATIC

MEDIUM

YES
2

1 NO

IDT
2

HIGH

OVLD
MTR
FAN

LOW

CAP
ODT

OVLD

COMPR

HERM

CAP
7

8
9

HTR

SYSTEM SWITCH
SWITCH LOGIC
SWITCH POSITION
OFF
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY

X = CLOSED
0 = OPEN
CIRCUIT
1 2 3 4 5 6 7 8 9 10
OOOOOOOOOO
OOOXXOXOXO
OXOOXOXOXO
OOXOXOXOXO
OOXOOXOXOX
OXOOOXOXOX
OOOXOXOXOX
XOOOOOOOOO

LEGEND
AR
MS
CAP
COMPR
MTR
OVLD
RV
IDT
ODT

- ANTICIPATOR RESISTOR
- MONEY SAVER
- CAPACITOR
- COMPRESSOR
- FAN MOTOR
- OVERLOAD
- REVERSING VALVE
- INDOOR THERMOSTAT
- OUTDOOR THERMOSTAT

HTR
HL
TF

- HEATER
- HEATER LIMIT
- THERMAL FUSE
- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

PART NO.
619-405-04

REV.
01

MODEL
YS09J10B-A

RED
BLUE

ALTERNATE

BROWN

COMPRESSOR

C AR

L1
M

L C2

SMOOTH CONDUCTOR OR BROWN

RED

BLUE

RED

GRAY

BLACK
PINK
WHITE

ORANGE
PURPLE
BLUE

WHITE

BLACK

OVERLOAD
PROTECTOR
WHITE
BLACK
BLUE
ORANGE
BROWN

3
1

PINK

FAN
MOTOR

PURPLE

RED
c

RIBBED CONDUCTOR OR BLUE

RED
BLUE

FAN

GREEN

GREEN OR
GREEN/
YELLOW

3
2

ROCKER SWITCH
(GE)

ANTICIPATOR
RESISTOR

BLUE
BLACK OR WHITE
GREEN OR
GREEN/YELLOW
TO INNERWALL/
MOTOR MOUNT

SUPPLY
CORD

YELLOW

BLUE

GRAY

COMPRESSOR
WIRE HARNESS

BLACK

DEFROST
THERMOSTAT

RED

WHITE

REVERSING
VALVE

YELLOW

BLUE

SYSTEM
SWITCH

BLACK

BLUE
RED

WHITE

THERMOSTAT

COMPRESSOR
TERMINAL
ORIENTATION
MAY VARY.
REFER TO
MARKINGS ON
COMPRESSOR

BROWN

BLACK

RED
BLUE

WIRING DIAGRAM

TO CAPACITOR
BRACKET

BROWN
CAPACITOR

TO CHASSIS

SCHEMATIC

MS
1

MEDIUM

NO
2

3 YES

IDT
2

HIGH

OVLD
MTR
FAN

LOW

OVLD

COMPR

C
1

HERM

S
7

CAP

RV
ODT

9
AR

SYSTEM SWITCH
SWITCH LOGIC
SWITCH POSITION
OFF
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY

X = CLOSED
0 = OPEN
CIRCUIT
1 2 3 4 5 6 7 8 9 10
OOOOOOOOOO
OOOXXOXOXO
OXOOXOXOXO
OOXOXOXOXO
OOXOOXOXOX
OXOOOXOXOX
OOOXOXOXOX
XOOOOOOOOO

LEGEND
AR
MS
CAP
COMPR
MTR
OVLD

- ANTICIPATOR RESISTOR
- MONEY SAVER
- CAPACITOR
- COMPRESSOR
- FAN MOTOR
- OVERLOAD PROTECTOR

- COMBINATION TERMINAL

RV
IDT
ODT

- REVERSING VALVE

- PLASTIC INSULATOR

- INDOOR THERMOSTAT
- OUTDOOR THERMOSTAT

- GROUND LEAD

PART NO.
619-142-17

REV.
01

MODELS
EQ08J11-A, EQ08J11-B
BLUE

WIRING DIAGRAM

CONDUCTOR

YELLOW
COMPRESSOR
L1

*
2

BLUE

"F"

RED

"F"
"F"

H L

HARNESS, COMPR.

SMOOTH (OR BROWN)

BLUE

SWITCH
SYSTEM

RED

THERMOSTAT

BLACK

RED

3
1

NOTE:
OPTIONAL
CONFIGURATION

BLACK

SUPPLY CORD

RIBBED CONDUCTOR

BLACK

WHITE

RED

BROWN

BLACK

TO CAPACITOR
BRACKET

FAN

GREEN

CAPACITOR
RED

BLUE

ORANGE

FAN
MOTOR

GREEN

RED
ORANGE

HEATER

SCHEMATIC

L1
IDT
R

OVLD

1
C

COMPR

1
2

HERM

S
L2

CAP

2
2

HTR

H
3

OVLD
MTR

FAN

S
L

CAP

SYS SW

X = CLOSED
0 = OPEN

SWITCH LOGIC
SWITCH POSITION

LOW HEAT
HI HEAT

1
2
3
4
5
6

1
O
O
X
X
O
O

2
O
O
O
O
X
X

3
O
X
X
O
O
X

4
O
O
O
X
X
O

HL
CAP
COMPR

- HEATER LIMIT
- CAPACITOR
- COMPRESSOR

MTR
OVLD

- FAN MOTOR
- OVERLOAD PROTECTOR

SYS SW
IDT
HTR

- THERMAL FUSE

OFF
FAN
HI COOL
LOW COOL

LEGEND

CIRCUIT
- PRE-INSULATED CONDUCTOR
- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

- SYSTEM SWITCH
- INDOOR THERMOSTAT
- HEATER

PART NO.
617-581-12

REV.
01

MODELS
WS07A10E-B, WS07A10E-C, WS10A10-A, WS12A10E-A,
WS09A30E-B, WS12A30E-A, WS15A30-A

WIRING DIAGRAM
COMPRESSOR
BLUE

BLACK

RED

PURPLE

BLUE

SYSTEM SWITCH
OVERLOAD
PROTECTOR
M L

BLACK
SMOOTH CONDUCTOR

PURPLE

BLACK

RED

BROWN

COMPRESSOR
WIRE HARNESS

CAPACITOR
RED

THERMOSTAT

BLACK

WHITE (OR YELL0W)
BROWN

SUPPLY CORD
GREEN

HER

FAN

PURPLE
RED

RIBBED CONDUCTOR

BLUE

FAN
MOTOR

TO GROUNDING
SCREW

NEUTRAL

SCHEMATIC

(115 V)

(208/230 V)

IDT
1

OVLD

COMPR
HERM

CAP

2
2
HIGH

H
3

R
MEDIUM

OVLD
MTR

4
S

LOW

FAN

CAP

SYS SW

SWITCH LOGIC

X = CLOSED
0 = OPEN

SWITCH POSITION

OFF
LOW COOL
MED COOL
HI COOL
FAN ONLY

LEGEND

CIRCUIT
1
O
X
X
X
O

2
O
O
O
O
X

3
O
O
O
X
O

4
O
O
X
O
O

5
O
X
O
O
O

CAP
COMPR

- CAPACITOR
- COMPRESSOR

MTR
OVLD

- FAN MOTOR
- OVERLOAD PROTECTOR

SYS SW
IDT

- SYSTEM SWITCH
- INDOOR THERMOSTAT

- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

PART NO.
617-581-14

REV.
00

MODELS
WE09A33E-B, WE12A33E-A, WE15A33-A

WIRING DIAGRAM
COMPRESSOR
C
S

BLACK

BLUE

WHITE
PURPLE
PINK

OVERLOAD
PROTECTOR

BLACK

RED

BLUE

SYSTEM SWITCH
1
COMPRESSOR
WIRE HARNESS

5
C

L1
H

L C2

3
1

RED
BROWN

BLACK
PURPLE
RED
YELLOW
BROWN

THERMOSTAT
YELLOW
SUPPLY
CORD

FAN
MOTOR

SMOOTH CONDUCTOR
RIBBED CONDUCTOR
RED
ORANGE
c

CAPACITOR

YELLOW
HE
RM

FAN

BLUE

HEATER

SCHEMATIC

MEDIUM

2
3

HIGH

OVLD
MTR

CAP

1
6

FAN

LOW

1
C

COMPR

OVLD
7

HERM

CAP

TF
HTR

SYS SW

SWITCH LOGIC
SWITCH POSITION
OFF
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY

X = CLOSED
0 = OPEN
CIRCUIT
1 2 3 4 5 6 7 8 9 10
OOOOOOOOOO
OOOXXOXOXO
OXOOXOXOXO
OOXOXOXOXO
OOXOOXOXOX
OXOOOXOXOX
OOOXOXOXOX
XOOOOOOOOO

LEGEND
AR
MS
CAP
COMPR
MTR
OVLD

- ANTICIPATOR RESISTOR
- MONEY SAVER/ROCKER SWITCH
- CAPACITOR
- COMPRESSOR
- FAN MOTOR
- OVERLOAD PROTECTOR

SYS SW
IDT

- INDOOR THERMOSTAT

- SYSTEM SWITCH

HTR
HL
TF

- HEATER
- HEATER LIMIT
- THERMAL FUSE
- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

PART NO.
617-581-15

REV.
00

MODELS
WY09A33F-A, WY12A33G-A

WHITE

WIRING DIAGRAM

BLUE
BLUE

BLUE
BLACK

BROWN
YELLOW

SYSTEM SWITCH
MS

REV VALVE

BLUE
AR

YELLOW

BLACK
C2

BLACK

BLACK
PURPLE

RED
YELLOW
BROWN

3
1

FAN MOTOR
R

BROWN

BLUE

WHITE

COMPRESSOR
BLUE

HARNESS, COMPRESSOR
MOLDED

THERMOSTAT
BLACK

BLACK

BLUE

OVERLOAD,
PROTECTOR

DEFROST
T/STAT

RED

BLACK

HEATER
ORANGE

YELLOW

BROWN

ORANGE

YELLOW

SMOOTH CONDUCTOR

SUPPLY CORD

RED

RIBBED CONDUCTOR

YELLOW

GREEN

HERM

FAN

BLUE

CAPACITOR

TO GROUNDING
SCREW

SCHEMATIC

L1
L1

1
M

2
3

HIGH

OVLD
MTR

CAP
R

IDT

OVLD
3
2

COMPR

HERM

CAP

ODT

HTR

S
1

FAN

LOW

MEDIUM

4
9

AR
10

SWITCH LOGIC
SWITCH POSITION
OFF
LOW COOL
MEDIUM COOL
HIGH COOL
HIGH HEAT
MEDIUM HEAT
LOW HEAT
FAN ONLY

X = CLOSED
0 = OPEN
CIRCUIT
1 2 3 4 5 6 7 8 9 10
OOOOOOOOOO
OOOXXOXOXO
OXOOXOXOXO
OOXOXOXOXO
OOXOOXOXOX
OXOOOXOXOX
OOOXOXOXOX
XOOOOOOOOO

LEGEND
MS
CAP
COMPR
MTR
OVLD

- MONEY SAVER
- CAPACITOR
- COMPRESSOR
- FAN MOTOR
- OVERLOAD PROTECTOR

RV
IDT
ODT

- REVERSING VALVE
- INDOOR THERMOSTAT
- OUTDOOR THERMOSTAT

HTR
HL
TF

- HEATER
- HEATER LIMIT
- THERMAL FUSE
- GROUND LEAD
- COMBINATION TERMINAL
- PLASTIC INSULATOR

PART NO.
617-581-02

REV.
03

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.

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
www.friedrich.com
Printed in the U.S.A.

RACServMn (7-03)

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Create Date                     : 2003:07:18 14:38:52-05:00
Modify Date                     : 2004:01:07 10:44:21-06:00
Page Count                      : 64
Creation Date                   : 2003:07:18 19:38:52Z
Mod Date                        : 2003:07:18 19:38:52Z
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Metadata Date                   : 2003:07:18 19:38:52Z
Creator                         : HHUMMEL
Title                           : racservmn(7-17-03)_newest.p65

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Friedrich Racservmn Users Manual Racservmn(7 17 03)_newest.p65

racservmn Room_Air_Service_Manual

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