Friedrich WALLMASTER 2008 User Manual
Service Manual  
Fan  
O
nly  
Low  
ool  
Low  
C
Heat  
Med  
ool  
Med  
Heat  
H
C
C
E
oole  
r
High  
ool  
e
r
igh  
Warm  
C
Heat  
R
P
E
R
A
T
U
TEM  
M
O
D
E
resta  
rting  
before  
m
inutes  
Wait  
three  
2
7
Te  
mp  
er  
at  
ur  
e
Co  
ole  
r
W
arm  
er  
Co  
ol  
Po  
we  
r
Fa  
n
Fa  
n
Mo  
ne  
y
On  
ly  
Sp  
ee  
d
Sa  
®
ve  
r
Tim  
er  
Op  
er  
Sta  
at  
ion  
rt  
On  
/O  
ff  
St  
op  
Se  
t
H
r.  
Models  
2009  
WallMaster® Thru-the-Wall  
2008  
WM-ServMan (04-09)  
Table Of Contents  
Important Safety Information ....................................................................................................................2-4  
Introduction ..................................................................................................................................................4  
WallMaster Model Number Code and Serial Number Identification ............................................................5  
Performance Data / Sleeve and Chassis Dimensions .................................................................................6  
Electrical Data ..............................................................................................................................................7  
Functional Components ...............................................................................................................................8  
How to Operate the Electronic WallMaster Room Air Conditioner ..........................................................9-10  
Remote Control ..........................................................................................................................................11  
Electronic Control: Operation, Testing, Error Codes, Rebooting ..........................................................12-13  
How to Operate the WallMaster with Rotary Controls, Control Testing ......................................................14  
Electronic Control Heat Pump Operation ...................................................................................................15  
Components Testing ..............................................................................................................................15-17  
Refrigeration System Sequence of Operation ............................................................................................18  
Sealed System Refrigeration Repairs / Charging ..................................................................................19-22  
Hermetic Components Check ................................................................................................................23-26  
Reversing Valve Description/Operation ......................................................................................................24  
Testing the Coil and Reversing Valve ....................................................................................................25-26  
Compressor Checks ..............................................................................................................................27-28  
Compressor Replacement .....................................................................................................................29-30  
Routine Maintenance .............................................................................................................................31-32  
General Troubleshooting .......................................................................................................................33-39  
Wiring Diagrams ....................................................................................................................................40-44  
Installation Accessories ..............................................................................................................................45  
Installation Instructions for “WSC” Sleeve .............................................................................................46-47  
Installation Instructions for Baffle Adapter Kit .............................................................................................48  
Seal Gasket Installation Instructions ...........................................................................................................49  
Installation Instructions for Internal Drain Kit (IDK) .....................................................................................50  
Assembly and Installation Instructions for Drain Kit (DK) ...........................................................................51  
Installation Instructions for Sub-Base .........................................................................................................52  
Installation Instructions for Architectural Grille Model AG-48-49 ...........................................................53-54  
Warranty .....................................................................................................................................................55  
1
IMPORTANT SAFETY INFORMATION  
The information contained in this manual is intended for use by a qualified service technician who is familiar  
with the safety procedures required for installation and repair, and who is equipped with the proper tools and  
test instruments required to service this product.  
Installation or repairs made by unqualified persons can result in subjecting the unqualified person making  
such repairs as well as the persons being served by the equipment to hazards resulting in injury or electrical  
shock which can be serious or even fatal.  
Safety warnings have been placed throughout this manual to alert you to potential hazards that may be  
encountered. If you install or perform service on equipment, it is your responsibility to read and obey these  
warnings to guard against any bodily injury or property damage which may result to you or others.  
Your safety and the safety of others are very important.  
We have provided many important safety messages in this manual and on your appliance. Always read  
and obey all safety messages.  
This is a safety Alert symbol.  
This symbol alerts you to potential hazards that can kill or hurt you and others.  
All safety messages will follow the safety alert symbol with the word “WARNING”  
or “CAUTION”. These words mean:  
You can be killed or seriously injured if you do not follow instructions.  
WARNING  
You can receive minor or moderate injury if you do not follow instructions.  
CAUTION  
All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury,  
and tell you what will happen if the instructions are not followed.  
A message to alert you of potential property damage will have the  
word “NOTICE”. Potential property damage can occur if instructions  
are not followed.  
NOTICE  
PERSONAL INJURY OR DEATH HAZARDS  
ELECTRICAL HAZARDS:  
•
Unplug and/or disconnect all electrical power to the unit before performing inspections,  
maintenance, or service.  
•
•
•
Make sure to follow proper lockout/tag out procedures.  
Always work in the company of a qualified assistant if possible.  
Capacitors, even when disconnected from the electrical power source, retain an electrical charge  
potential capable of causing electric shock or electrocution.  
•
•
Handle, discharge, and test capacitors according to safe, established, standards, and approved  
procedures.  
Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary  
to test or troubleshoot equipment with the power on to the unit.  
2
•
•
Do not spray or pour water on the return air grille, discharge air grille, evaporator coil, control panel,  
and sleeve on the room side of the air conditioning unit while cleaning.  
Electrical component malfunction caused by water could result in electric shock or other electrically  
unsafe conditions when the power is restored and the unit is turned on, even after the exterior is dry.  
•
•
•
•
•
•
•
Never operate the A/C unit with wet hands.  
Use air conditioner on a single dedicated circuit within the specified amperage rating.  
Use on a properly grounded outlet only.  
Do not remove ground prong of plug.  
Do not cut or modify the power supply cord.  
Do not use extension cords with the unit.  
Follow all safety precautions and use proper and adequate protective safety aids such as: gloves,  
goggles, clothing, adequately insulated tools, and testing equipment etc.  
•
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.  
REFRIGERATION SYSTEM HAZARDS:  
•
•
•
Use approved standard refrigerant recovering procedures and equipment to relieve pressure before  
opening system for repair.  
Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor  
to moderate injury.  
Be extremely careful when using an oxy-acetylene torch. Direct contact with the torch’s flame or hot  
surfaces can cause serious burns.  
•
•
•
Make sure to protect personal and surrounding property with fire proof materials.  
Have a fire extinguisher at hand while using a torch.  
Provide adequate ventilation to vent off toxic fumes, and work with a qualified assistant whenever  
possible.  
•
•
•
Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for  
leaks, flushing etc.  
Make sure to follow all safety precautions and to use proper protective safety aids such as: gloves,  
safety glasses, clothing etc.  
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.  
MECHANICAL HAZARDS:  
•
Extreme care, proper judgment and all safety procedures must be followed when testing,  
troubleshooting, handling, or working around unit with moving and/or rotating parts.  
•
Be careful when, handling and working around exposed edges and corners of sleeve, chassis, and  
other unit components especially the sharp fins of the indoor and outdoor coils.  
•
•
Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.  
Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.  
3
PROPERTY DAMAGE HAZARDS  
FIRE DAMAGE HAZARDS:  
•
•
•
•
•
•
•
Read the Installation/Operation Manual for this air conditioning unit prior to operating.  
Use air conditioner on a single dedicated circuit within the specified amperage rating.  
Connect to a properly grounded outlet only.  
Do not remove ground prong of plug.  
Do not cut or modify the power supply cord.  
Do not use extension cords with the unit.  
Failure to follow these instructions can result in fire and minor to serious property damage.  
WATER DAMAGE HAZARDS:  
•
Improper installation maintenance, or servicing of the air conditioner unit, or not following the above  
Safety Warnings can result in water damage to personal items or property.  
•
•
•
Insure that the unit has a sufficient pitch to the outside to allow water to drain from the unit.  
Do not drill holes in the bottom of the drain pan or the underside of the unit.  
Failure to follow these instructions can result in result in damage to the unit and/or minor to serious  
property damage.  
INTRODUCTION  
This service manual is designed to be used in conjunction with the installation manuals provided with each unit.  
This service manual was written to assist the professional HVAC service technician to quickly and accurately  
diagnose and repair any malfunctions of this product.  
This manual, therefore, will deal with all subjects in a general nature. (i.e. All text will 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.)  
1” Diameter Plug  
WSC  
Sleeve  
Airflow  
Decorative  
Front  
7
6
5
3
C
6
5
4
3
2
1
B
A
B
0
1
A
7
0
S
W
#
L
E
D
O
M
Discharge  
Grille  
Return  
Air Grille  
4
FRIEDRICH wAllMASTER MODEl NUMBER CODE  
W S 08  
B
1
0
B
1st DIGIT - FUNCTION  
W = Thru-The-Wall, WallMaster Series  
2nd DIGIT - TYPE  
S = Straight Cool  
E = Electric Heat  
Y = Heat Pump  
3rd & 4th DIGITS - APPROXIMATE BTU/HR (Cooling)  
Heating BTU/HR capacity listed in Specifications/Performance Data Section  
5th DIGIT - ALPHABETICAL MODIFIER  
6th DIGIT - VOLTAGE  
1 = 115 Volts  
3 = 230-208 Volts  
7th DIGIT  
0 = Straight Cool & Heat Pump Models  
ELECTRIC HEAT MODELS  
3 = 3 KW Heat Strip, Nominal  
8th DIGIT  
Major Change  
SERIAl NUMBER IDENTIFICATION GUIDE  
Serial Number  
Decade Manufactured  
L
C
J
R
00001  
L=0  
A=1  
B=2  
C=3  
D=4  
E=5  
F=6  
G=7  
H=8  
J=9  
Production Run Number  
Year Manufactured  
Product Line  
X = WallMaster  
A=1  
B=2  
C=3  
D=4  
E=5  
F=6  
G=7  
H=8  
J=9  
K=0  
Month Manufactured  
A=Jan D=Apr G=Jul K=Oct  
B=Feb E=May H=Aug L=Nov  
C=Mar F=Jun J=Sept M=Dec  
5
2008 / 2009 PERFORMANCE DATA  
EVAPORATOR AIR EVAPORATOR TEMP.  
OPERATING  
PRESSURES  
BREAKER  
FUSE  
ELECTRICAL RATINGS  
R-22 REF.  
TEMP. DEG. F  
DEG. F  
COOLING  
PERFORMANCE  
DATA*  
CONDENSER  
TEMPERATURE  
DEG. F  
Discharge Suction Liquid  
Sub-  
Cooling  
Evap Motor  
Super Heat  
Temp  
Temp  
Temp  
CFM  
RPM  
Discharge Temp.  
Locked Rotor Charge in  
Amps  
60 Hertz  
Amps  
T(in)  
T(out)  
Suction  
Discharge Amps Cool Amps Heat  
Air  
Drop F.  
OZ.  
WS08B10A-D  
WS08B10A-F  
WS10B10A-D  
WS14B10A-D  
WS14B10A-E  
WS10B30A-D  
WS13B30B-E  
WS13B30B-F  
WS16B30A-D  
WS16B30A-E  
WE10B33A-C  
WE10B33C-A  
WE13B33B-D  
WE13B33C-A  
WE13B33B-E  
WE16B33A-C  
WE16B33C-A  
WE16B33A-D  
WY10B33A-C  
WY10B33C-A  
WY10B33A-D  
WY13B33A-C  
WY13B33C-A  
55  
55  
52  
52  
52  
55  
50  
50  
52  
52  
53  
53  
50  
50  
50  
52  
52  
52  
53  
53  
53  
52  
52  
25  
25  
28  
28  
28  
25  
30  
30  
28  
28  
27  
27  
30  
30  
30  
28  
28  
28  
27  
27  
27  
29  
29  
55  
55  
53  
52  
52  
53  
52  
52  
51  
51  
54  
54  
52  
52  
52  
51  
51  
51  
54  
54  
54  
52  
52  
55  
55  
51  
52  
52  
57  
50  
50  
53  
53  
52  
52  
50  
50  
50  
53  
53  
53  
52  
52  
52  
51  
51  
127  
125  
128  
128  
128  
131  
131  
131  
121  
121  
126  
126  
131  
131  
131  
121  
121  
121  
126  
126  
126  
127  
127  
165  
179  
176  
179  
179  
179  
180  
180  
154  
154  
180  
180  
180  
180  
180  
174  
174  
174  
180  
180  
180  
180  
180  
61  
74.5  
68  
63  
63  
68  
61  
61  
54  
54  
82  
82  
61  
61  
61  
57  
57  
57  
66  
66  
66  
64  
64  
102  
102  
105  
99  
18  
18  
16  
14  
14  
16  
13  
13  
18  
18  
16  
16  
13  
13  
13  
18  
18  
18  
16  
16  
16  
16  
16  
25  
25  
24  
28  
28  
23  
24  
24  
32  
32  
31  
31  
24  
24  
24  
30  
30  
30  
31  
31  
31  
29  
29  
87  
87  
79  
82  
82  
77  
81  
81  
74  
74  
82  
82  
81  
81  
81  
74  
74  
74  
82  
82  
82  
80  
80  
281  
281  
293  
297  
297  
289  
305  
305  
315  
315  
289  
289  
305  
305  
305  
315  
315  
315  
225  
225  
225  
300  
300  
7.1  
6.9  
36.2  
36.2  
45.0  
58.0  
58.0  
26.0  
27.4  
27.4  
35.0  
35.0  
45.0  
45.0  
27.4  
27.4  
27.4  
35.0  
35.0  
35.0  
26.0  
26.0  
26.0  
27.4  
27.4  
20.5  
18.9  
22.0  
44.9  
44.9  
22.5  
36.5  
36.5  
47.6  
47.6  
38.0  
38.0  
36.5  
36.5  
36.5  
35.2  
35.2  
35.2  
38.0  
38.0  
38.0  
35.0  
35.0  
257  
257  
248  
293  
293  
235  
288  
288  
292  
292  
225  
225  
288  
288  
288  
281  
281  
281  
225  
225  
225  
260  
260  
1100  
1100  
1100  
1300  
1300  
1100  
1280  
1280  
1421  
1421  
1074  
1074  
1280  
1280  
1280  
1305  
1305  
1305  
1074  
1074  
1074  
1200  
1200  
15  
15  
15  
15  
15  
15  
15  
15  
15  
15  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
20  
9.0  
12.4  
12.4  
4.6  
99  
106  
103  
103  
99  
6.9/6.5  
6.9/6.5  
7.7  
99  
7.7  
99  
4.6  
15.2  
15.2  
99  
4.6  
103  
103  
103  
100  
100  
100  
99  
6.9/6.5  
6.9/6.5  
6.9/6.5  
6.5  
15.7  
15.7  
15.7  
16.1  
6.5  
16.1  
6.5  
16.1  
4.6  
4 / 15.2  
4 / 15.2  
4 / 15.2  
5.6 / 15.7  
5.6 / 15.7  
99  
4.6  
99  
4.6  
103  
103  
6.5  
6.5  
WY13B33A-D  
52  
29  
52  
51  
127  
180  
64  
103  
16  
29  
80  
300  
6.5  
5.6 / 15.7  
27.4  
35.0  
260  
1200  
20  
* Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity  
®
Specifications  
ENERGYSTAR models  
Energy  
Cooling  
Heating  
Capacity  
BTU/h  
Eꢀciency Moisture Room  
Weight  
Lbs.  
Capacity  
Volts Cooling Cooling Heating  
Heating  
Watts  
Ratio  
EER  
Removal Side Air  
Model  
WALLMASTER  
BTU/h  
Rated  
Amps  
Watts  
Amps  
Pints/Hr. Circulation Sleeve Ship/Net  
WS08B10A  
WS10B10A  
WS14B10A  
WS10B30A  
WS13B30B  
WS16B30A  
WE10B33C  
WE13B33C  
WE16B33C  
WY10B33C  
WY13B33C  
8000  
—
—
—
—
—
—
115  
115  
115  
6.8  
8.7  
762  
—
—
—
10.5  
10.5  
1.3  
2.4  
3.3  
2.1  
3.3  
4.2  
2.1  
3.3  
4.2  
2.5  
3.2  
245  
245  
295  
260  
280  
290  
260  
280  
290  
230  
280  
WSC  
WSC  
WSC  
WSC  
WSC  
WSC  
WSC  
WSC  
WSC  
WSC  
WSC  
97/93  
10000  
954  
—
107/103  
116/112  
105/101  
113/109  
123/119  
107/103  
115/111  
125/121  
111/107  
120/116  
13500  
12.0  
1415  
—
—
9.5  
10000/10000  
12500/12000  
15800/15000  
230/208 4.6/5.0  
230/208 6.3/6.7  
230/208 7.8/8.5  
1005/996  
1404/1379  
1756/1705  
1005/996  
—
—
10.0/10.0  
8.9/8.7  
9.0/8.8  
10.0/10.0  
8.9/8.7  
9.0/8.8  
10.0/10.0  
9.0/9.0  
—
—
—
—
10000/10000 11000/9100 230/208 4.6/5.0  
12500/12000 11000/9100 230/208 6.3/6.7  
15800/15000 11000/9100 230/208 7.8/8.5  
10100/9800 8100/7800 230/208 4.6/4.8  
12500/12100 10400/10000 230/208 6.4/6.8  
16.0/14.7  
3550/2950  
3550/2950  
3550/2950  
857/821  
1182/1136  
1404/1379 16.0/14.7  
1756/1705 16.0/14.7  
1013/976  
3.9/4.0  
5.4/5.7  
1389/1352  
Sleeve / Chassis Dimensions  
Thru-the-wall  
Finished Hole  
Depth  
with  
Front  
Minimum  
Extension  
Into Room  
Minimum  
Extension  
Outside  
Model  
Height  
16 3/4"  
15 3/4"  
Width  
27"  
Depth  
16 3/4"  
21"  
Height  
17 1/4"  
–
Width  
27 1/4"  
23"  
–
7 1/2"  
–
9/16"  
–
WSC Sleeve  
Chassis  
26 1/2"  
–
6
ElECTRICAl DATA  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before service or  
installation.  
All electrical connections and wiring MUST be  
installedbyaqualifiedelectricianandconformto  
the National Electrical Code and all local codes  
which have jurisdiction.  
Failure to do so can result in personal injury or  
death.  
NOTICE  
FIRE HAZARD  
Not following the above WARNING could result in fire or  
electically unsafe conditions which could cause moderate  
or serious property damage.  
Read, understand and follow the above warning.  
Wire Size  
Use ONLY wiring size recommended for single outlet branch circuit.  
Fuse/Circuit Breaker  
Use ONLY the correct HACR type and size fuse/circuit breaker. Read electrical ratings on unit’s  
rating plate. Proper circuit protection is the responsibiity of the homeowner.  
Grounding  
Receptacle  
Unit MUST be grounded from branch circuit through service cord to unit, or through separate  
ground wire provided on permanently connected units. Be sure that branch circuit or general  
purpose outlet is grounded.  
The field supplied outlet must match plug on service cord and be within reach of service cord.  
Do NOT alter the service cord or plug. Do NOT use an extension cord. Refer to the table above  
for proper receptacle and fuse type.  
Plug/Outlet/Circuit Rating  
Circuit Rating  
Breaker or T-D Fuse  
Plug Face  
(NEMA#)  
Wall Outlet  
Appearance  
Model Numbers  
WS08B10A, WS10B10A,  
WS14B10A  
125V - 15A  
5 - 15P  
6 - 15P  
6 - 20P  
WS10B30A, WS13B30A,  
WS16B30A  
250V - 15A  
250V - 20A  
WE10, WE13, WE16  
WY10, WY13  
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.  
*HACR: Heating Air Conditioning and Refrigeration  
7
FUNCTIONAL COMPONENTS  
A. Mechanical components  
Drain pan valve  
Temperature-sensitive valve that opens up to drain off condensate water when the outside temperature falls below 40°F  
and closes when the outside temperature reaches 60°F  
Plenum assembly  
Diffuser with directional louvers used to direct the conditioned airflow.  
Blower wheel  
Attaches to the indoor side of the fan motor shaft and is used for distributing unconditioned, room side air though the heat  
exchanger and delivering conditioned air into the room.  
Slinger fan blade  
Attaches to the outdoor side of the fan motor shaft and is used to move outside air through the condenser coil, while  
slinging condensate water out of the base pan and onto the condenser coil, thus lowering the temperature and pressures  
within the coil.  
B. Electrical components  
Thermostat  
Used to maintain the specified room side comfort level  
System switch  
Used to regulate the operation of the fan motor, the compressor or to turn the unit off. For troubleshooting, refer to the  
wiring diagrams and schematics in the back of this service manual.  
Capacitor  
Reduces line current and steadies the voltage supply, while greatly improving the torque characteristics of the fan motor  
and compressor motor.  
MoneySaver® switch  
When engaged, it sends the power supply to the fan motor through the thermostat, which allows for a cycle-fan operation.  
Fan Motor  
Dual-shafted fan motor operates the indoor blower wheel and the condenser fan blade simultaneously.  
Solenoid  
Used to energize the reversing valve on all heat pump units.  
Heating element  
Electric resistance heater  
Heat anticipator  
Used to provide better thermostat and room air temperature control.  
C. Hermetic components  
Compressor  
Motorized device used to compress refrigerant through the sealed system.  
Reversing valve  
A four-way switching device used on all heat pump models to change the flow of refrigerant to permit heating or cooling.  
Check valve  
A pressure-operated device used to direct the flow of refrigerant to the proper capillary tube, during either the heating or  
cooling cycle.  
Capillary tube  
A cylindrical meter device used to evenly distribute the flow of refrigerant to the heat exchangers (coils.)  
8
How to operate the Friedrich WallMaster  
1
Power  
2
3
4
8
9
Cool  
Fan  
Speed  
Smart  
Fan  
Fan Only  
Heat  
6
5
Mode  
Set  
7
Clock  
Money Timer  
Saver On/Off  
Start Time  
Stop Time  
14  
13  
Temp/Hour  
10 11 12  
Figure 1: WS Model cool-only control panel  
Figure 2: WY/WE Model heat-cool control panel  
To start unit  
6
7
WARMER –Touch the button toraisetheroom air temperature.  
Press both the and buttons at the same time to switch  
the temperature from Fahrenheit (°F) to Celsius (°C). Repeat  
Step 7 to switch from °C back to °F.  
If your air conditioner is installed and plugged into a proper receptacle,  
it is ready to go. The rst time the unit is started, the compressor will  
delay for three minutes. See Automatic Component Protection on the  
following page.  
To adjust fan speed  
1
Touch the Power button once. The unit will automatically be in  
Cool mode with the temperature set at 75 F (24 C) and the fan  
speed at F1, the sleep setting.  
°
°
8
Touch the Fan Speed button to see the current setting. Touch  
it again to change speed. F1 is the lowest setting (SLEEP  
SETTING / LOW), F2 is MEDIUM, and F3 is HIGH.  
To set mode of operation  
When you rst turn the unit on, it will be in the Cool mode with con-  
stant fan.  
To activate Smart Fan(WS cool-only models)  
9
There isafourth option, SF, whenselecting the fan speed. Thisis  
the SMART FAN function. SMART FAN DOES NOT OPERATE  
IN CONJUNCTION WITH THE FAN ONLY MODE.  
2
On WS cool-only models, touch the Mode buton once to activate  
the MoneySaver® (WS models only. See item 14 for Money Saver  
instructions on WY/WE models).  
MoneySaver® is a feature that cycles the fan with the compres-  
sor so that the fan does not run all the time. This saves energy  
andimprovesdehumidi cation. MoneySaver® will also run to test  
the temperature if the off cycle is too long. Or you may prefer  
constant fan for more air movement. (To return to constant fan,  
touch the Mode button two more times).  
To activate Smart Fan(WY/WE heat-cool models)  
9
Press theSmart Fan button to activate the Smart Fan.The light  
will indicate that this feature is in use.  
Smart Fan will adjust the fan speed automatically to maintain the  
desired comfort level. For example, if the outside doors in your home  
are opened 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 you from having to adjust  
the fan speed on your own.  
In order to run the fan by itself, do the following:  
On WY/WS heat-cool models, touch the Mode button once to  
activate the Fan Onlyfeature. The Fan Onlysetting will circulate  
air in the room without the compressor coming on.  
To set the hour clock  
Continuing from MoneySaver® mode, touch the Mode button  
once to activate the Fan Only feature (WS cool-only models).  
3
10  
Touch the Set Hour button to see the current setting. The  
number that is displayed is the approximate time (hour only).  
Use the and  
buttons to change the settings. BE SURE  
To adjust temperature  
TO SET A.M. AND P.M. ACCORDINGLY. (P.M. is indicated by  
a red light in the upper left corner of the display).  
Use the Mode button to select either the Cool or MoneySaver®  
4
function (or Heat for WY/WE heat-cool models)  
5
COOLER – Touch the button to lower the room air temperature.  
9
To set the timer  
NOTE: If the unit is unplugged or the power is interrupted, the HOUR  
must be reset or theTimer On/Off will not function when desired.  
NOTE: Set the HOUR CLOCK (Set Hour) before attempting to set  
timer functions.  
You can set the Start Time and Stop Time a minimum of one hour  
apart, and a maximum of 23 hours apart.  
To Activate Money Saver (WY/WE models)  
14  
Press the Money Saver button to activate the Money Saver  
feature. The light will indicate the Money Saver is in use.  
11  
After setting the time, press the Set Hour button once (Start  
light on). Use the and buttons to select the time that the  
unit will START.  
MoneySaver® is a feature that cycles the fan with the compres  
sor so that the fan does not run all the time. This saves energy  
andimprovesdehumidification. MoneySaver® will alsorunto test  
the temperature if the off cycle is too long. Or you may prefer  
constant fan for more air movement. (To return to constant fan,  
touch the Mode button two more times).  
12  
After selecting the Start Time, press the Set Hour button once.  
(Stop Light on). Use the  
and  
buttons to select the time  
that the unit will STOP. After selecting the stopping time, press  
the Set Hour button once.  
13  
Press the Timer On/Off button (light turns on) to activate the  
timer function. To deactivate this function, press theTimer On/  
Off button once again (light turns off). Once the on and off times  
have been selected, they will remain in memory and cycle daily  
until changed.  
Automatic component protection  
Your unit is equipped with Automatic Component Protection.  
To protect the compressor of the unit, there is a three minute delay  
if you turn the unit off or if power is interrupted. The fan will not be  
affected. Also, if you switch fromCool mode to Fan Only mode, and  
switch back to Cool mode, there is a three-minute delay before the  
compressor comes back on.  
10  
Figure 3: WY/WE heat-cool model remote control  
Figure 4: WS Models Only  
Additional RC1 wireless remote controls can be purchased from your Friedrich dealer.  
Additional RC1 wireless remote controls can be purchased from your Friedrich dealer.  
Using the remote control  
To set the hour clock  
To start unit  
9
1
SET HOUR CLOCK - Press the Set Hr. button once to see the  
current clock setting. Continue pressing the button until you  
arrive at the current time (Hour only). Minutes are not shown on  
the display. Make sure that the A.M. / P.M. setting is correct.  
POWER- Press the Power buttononce. Theunitwill automatically  
start in the mode and fan speed it was last left on.  
To set mode of operation  
2
COOL - Press the Cool button to automatically switch the operat-  
ing mode to COOL.  
To set the timer  
NOTE: You can set the START and STOP times a minimum of one  
hour apart, and a maximum of 23 hours apart.  
3
4
FAN ONLY - Press the Fan Only button if you want to run the  
fan only.  
10  
11  
12  
TIMER START - Press Start to view the current start time for cool-  
ing. Continue pressingtheSTARTbutton until you arriveat the start  
time you desire. The start time for cooling will then be set.  
HEAT (WY/WE models only) - Press the Heat button to  
automatically switch the operating mode to HEAT.  
MoneySaver® - Press the Money Saver® button to activate  
the MoneySaver® feature. This feature cycles the fan with the  
compressor so that the fan does not run all the time.  
5
TIMER STOP - Press the Stop button. Continue pressing the  
STOP button until you arrive at the stop time you desire. The  
stop time for cooling will then be set.  
To adjust temperature  
6
TIMER ON / OFF - Press the O n/Off button (under Timer  
Operation) to activate (light on) or deactivate (light off) the timer.  
Once the on and off times have been selected, they will remain  
in memory and cycle daily until changed.  
WARMER -Press the Warmer button to raise the temperature setting.  
7
tting.  
COOLER - Press the Cooler button to lower the temperature se  
NOTE: If the unit is unplugged or the power is interrupted, the Set Hr.  
function must be reset or the Timer On/Off function will not work.  
To adjust fan speed  
8
FAN SPEED - Press the Fan Speed button to see the current  
setting. Press again to change the fan speed. F1 is the lowest  
setting (SLEEP / LOW), F2 is MEDIUM, F3 is HIGH, and SF is  
the SMART FAN setting.  
11  
ElECTRONIC CONTROl PANEl  
Figure 5: “WS” Cooling only models  
Electronic Control Panel  
Figure 6: “WE”/”WY” heat/cool models  
Electronic Control Panel  
72  
Power  
Cool  
Fan  
MoneySaver®  
Speed  
Mode  
Fan Only  
Clock  
Timer  
Set  
Start Time  
Stop Time  
On/Off  
Hour  
Temp/Hour  
TESTING THE ELECTRONIC CONTROL  
CHECKING ROOM TEMPERATURE  
The LEDs for Set/Hour: “Start Time” and “Stop Time” will  
blink 1 bps while Test Mode is active.  
1. Check the room temperature at the electronic control  
pad by pressing at the same time, the Fan Speed  
Test Mode has a duration of 90 minutes. Test Mode can be  
activated under any function, including Off.  
Test Mode is cancelled by pressing the Power (on/off)  
button, unplugging the unit, or when the 90 minutes times  
out.  
button and the Temp/Hour  
button on the WS/WE/  
WY models (see figures 5 and 6).  
2. The indoor temperature will display for 10 seconds.  
Indoortemperaturecanbeviewedinallmodes,including  
the Test Mode. The display can be changed back to  
the SET temperature by pressing any key (except the  
Power (on/off button) or it can do so automatically after  
10 seconds have elapsed.  
Test Mode settings are factory default of:  
Unit operation On, MoneySaver On, Cool Mode, 60  
degrees F, speed fan on High. “Timer” and “Set Hour”  
features are non-functional.  
Test Mode overrides the three minute compressor Lock-  
out, all delays for fan motor start, speed change, and when  
switching modes.  
ACTIVATING TEST MODE  
Activate Test Mode by pressing at the same time, the Mode  
button and the Temp/Hour  
button on on the WS/WE/  
WY models (see figures 5 and 6).  
ERROR CODE MODE  
Error Code Mode is used to display all error codes  
stored since reset. It is a sub-mode of Test Mode. Unit  
must be in Test Mode to enter the Error Code function.  
Exiting Error Code Mode: press the Timer On/Off  
button.  
Clearing Error Codes: Error codes are cleared  
from the memory by exiting from Error Code Mode.  
Activating Error Code Mode: Press the TIMER On/  
Off” button on the WS/WE/WY models (see figures 5  
and 6). The LED for the TIMER On/Off will flash 1 bps  
(beats per second) while Error Code Mode is active.  
MEMORY: On WS/WE/WY  
The electronic control has a memory to retain all  
functions and settings, as set up by the user, in the event  
of a power failure. For example: 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.  
Pressing the Temp/Hour  
Consecutive presses will scroll through all error codes  
stored. Press the Temp/Hour button to see the  
button will display “00”.  
reverse order of the error codes. When the end of the  
stored error codes is reached the temperature Set Point  
will appear. (Each error code is listed once)  
12  
ERROR CODES lISTING FOR “wS” MODElS  
E1  
SHORT CYCLE SITUATION: Defined as a  
compressorthatstartsandstopsmorefrequently  
than it should.  
E4 FROST PROBE SHORT: Normal operation is  
allowed. Replace probe.  
E5  
INDOOR PROBE OPEN: Control assumes  
indoor ambient temperature is 90 degrees F and  
unit will operate. Ohm indoor probe. Replace  
probe if Ohm value is not present.  
E2 KEYBOARD STUCK ERROR: If any key button  
is stuck or pressed for 20 seconds or more, the  
unit considers it stuck. If a key is stuck it will be  
ignored until released. If the “Mode” keyisstuck,  
the unit’s function will default to Cool mode.  
E6 INDOOR PROBE SHORT: Control assumes  
ambient temperature is 90 degrees F and unit  
will operate. Replace probe.  
E3 FROST PROBE OPEN: Normal operation is  
allowed. Ohm frost probe. Replace if Ohm value  
not read. If Ohm value is present replace the  
board.  
(See note and other infomation below)  
ERROR CODES lISTING FOR “wE/wY” MODElS  
E1  
SHORT CYCLE SITUATION: Defined as a  
compressorthatstartsandstopsmorefrequently  
than it should.  
NOTE: Allerrorcodesdisplayforprobesopenorshortedwill  
allow unit to operate. Unit may ice up if faulty components  
are not replaced.  
E2 KEYBOARD STUCK ERROR: If any key button  
is stuck or pressed for 20 seconds or more, the  
unit considers it stuck. If a key is stuck it will be  
ignored until released. If the “Mode” keyisstuck,  
the unit’s function will default to Cool mode.  
Indoor Coil Frost Probe Sensor (WS/WE/WY Models):  
Disables compressor at 30 degrees F+/- 3 degrees  
F. Compressor resumes operation when indoor coil  
temperature reaches 55 degrees F.  
Outdoor Coil Frost Probe Sensor (on WY models):  
Disables the compressor at 30 degrees F. Compressor  
resumes operation when temperature reaches 43 +/- 5  
degrees F.  
E3 AMBIENT (INDOOR) AIR PROBE OPEN  
OR SHORT: Control will assume ambient  
temperature is 90 degrees F when in Cool mode  
and 60 degrees F when in Heat mode. Unit will  
operate (see note below).  
Indoor Air Probe Sensor (WS/WE/WY Models)”:  
Control range is 60 degrees F to 90 degrees F +/- 3  
degrees F.  
E4 EVAPORATOR TEMPERATURE PROBE  
OPEN OR SHORT: Normal operation is allowed.  
Replace probe (see note below).  
REBOOT THE CONTROL PANEL  
To reboot the control panel on a WallMaster unit: with the  
unit on, simultaneously hold down the Mode button and  
E5  
CONDENSER  
TEMPERATURE  
PROBE  
OPEN OR SHORT: Normal operation is allowed.  
Replace probe.  
the Temperature Arrow  
button for approximately 10  
seconds. If the panel will reboot, you will hear the fan come  
on and the temperature window will read 60 degrees. If this  
happens, all you need to do is turn the unit off for about 10  
seconds and then turn it back on to finish the reboot cycle. If  
the panel does not reboot, you will most likely need to have  
the panel replaced.  
E7  
MOTOR OPERATION  
E9 HEAT PUMP FAILURE  
13  
Figure 7: System Control Panel  
FOR UNITS WITH ROTARY CONTROLS  
SYSTEM CONTROL SWITCH  
(“WE” & “WY” Models) 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.  
Fan  
Only  
Off  
Low  
Heat  
Low  
Cool  
The fan motor can also be operated independently on  
medium speed. See switch section as indicated on  
decorative control panel, in Figure 7.  
Med  
Cool  
Med  
Heat  
High  
Heat  
High  
Cool  
MAX  
HEAT  
MAX  
COOL  
!
Allow 3 min. between restarts  
Figure 8: System Control Switch  
(Heat Pump & Electric Heat Models)  
WARNING  
ELECTRIC SHOCK HAZARD  
Disconnect power to the unit before  
servicing. Failure to follow this warning  
could result in serious injury or death.  
SYSTEM CONTROL SWITCH - TEST  
Disconnect leads from control switch. Turn control to  
position being tested (see Figure 8). There must be  
continuity as follows:  
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”.  
NOTE:  
Units will operate in constant fan in the cooling mode  
and auto fan in the heating mode.  
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”, “M”  
and “2”.  
14  
ElECTRONIC CONTROl  
OPERATION  
Heat Pump w/back up Electric Heat  
Figure 9 : Thermostat  
If the indoor ambient air themister reads 55 degrees,  
turn off the compressor and turn on the electric heat and  
continue fan operation until temp setting is satisfied. Then  
revert to standard heat pump operation.  
If the compressor is time delayed:  
1. Turn on the electric heat until the compressor is not time  
delayed.  
2. When the compressor’s 3 minute time delay is over,  
turn off the electric heat, wait 5 seconds, then turn on the  
compressor.  
THERMOSTAT ADJUSTMENT  
No attempt should be made to adjust thermostat. Due to  
the sensitivity of the internal mechanism and the sophis-  
ticated equipment required to check the calibration, it is  
suggested that the thermostat be replaced rather than  
calibrated.  
Defrost:  
If the outdoor coil thermister reads 30 degrees for 2  
minutes continuously, turn off the compressor and turn on  
the electric heat and continue fan operation.  
FAN MOTOR  
Asingle phase permanentsplit capacitor motor is usedto 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 23)  
If the outdoor coil thermister reaches 43 degrees and  
the compressor has waited the standard delay time of  
180-240 seconds:  
1. Turn off the backup electric heat  
2. Wait 5 seconds  
3. Turn on the compressor  
4. Continue fan operation.  
WARNING  
ELECTRIC SHOCK HAZARD  
Disconnect power to the unit before  
servicing. Failure to follow this warning  
could result in serious injury or death.  
COMPONENTS TESTING  
THERMOSTAT  
(“WE” & “WY” Models)  
FAN MOTOR - TEST  
1. Determine that capacitor is serviceable.  
Across ambient thermostat is used on all electric heat and  
heat pump WallMaster models (see Figure 9).  
2. Disconnect fan motor wires from fan speed switch or  
system switch.  
Range from 60° F (±2° F) to 92° F (±2° F).  
3. Apply “live”testcordprobesonblackwire andcommon  
terminal of capacitor. Motor should run at high speed.  
TEST:  
4. Apply “live” test cord probes on red wire and common  
terminal of capacitor. Motor should run at low speed.  
WARNING  
ELECTRIC SHOCK HAZARD  
5. Apply “live” test cord probes on each of the remaining  
wires from the speed switch or system switch to test  
intermediatespeeds. Ifthecontrolisinthe“MoneySaver”  
mode and the thermostat calls for cooling, the fan will  
start-thenstopafterapproximately2minutes;thenthe  
fan and compressor will start together approximately 2  
minutes later.  
Disconnect power to the unit before  
servicing. Failure to follow this warning  
could result in serious injury or death.  
Remove wires from thermostat and check continuity  
between terminal “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.  
Fan Motor  
15  
CAPACITORS  
DEFROST THERMOSTAT  
(“WY” Electromechanical Control Models Only)  
WARNING  
ELECTRIC SHOCK HAZARD  
This thermostat is a single pole - double throw with con-  
tacts between terminal “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 “3” open, power to the compressor is interrupted.  
When contacts between terminals “2” and “1” make, power  
is suppled to the heater element.  
Turn off electric power before servicing.  
Discharge capacitor with a 20,000 Ohm 2 Watt  
resistor before handling.  
Failure to do so may result in personal injury,  
or death.  
Many motor capacitors are internally fused. Shorting the  
terminals will blow the fuse, ruining the capacitor. A 20,000  
ohm 2 watt resistor can be used to discharge capacitors  
safely. Remove wires from capacitor and place resistor  
across terminals. When checking a dual capacitor with  
a capacitor analyzer or ohmmeter, both sides must be  
tested.  
This control is a dual purpose control that acts as an  
outdoor thermostat and defrost control.  
When the sensing bulb, attached to the condenser coil,  
senses enough icing on the outdoor coil it will interrupt  
power to the compressor and supply power to the heating  
element until the coil temperature reaches above 43°.  
Then the heater will shut off and the unit will resume  
operating in the reverse cycle mode.  
Capacitor Check with Capacitor Analyzer  
The capacitor analyzer will show whether the capacitor is  
“open” or “shorted.” It will tell whether the capacitor is within  
its micro farads rating and it will show whether the capacitor  
is operating at the proper power-factor percentage. The  
instrument will automatically discharge the capacitor when  
the test switch is released.  
When the outdoor coil temperature drops below 20 degrees,  
the unit will operate in electric heat mode continuously until  
the outdoor coil temperature rises above 43°.  
Figure 10: Defrost Control  
Capacitor Connections  
The starting winding of a motor can be damaged by a  
shorted and grounded running capacitor. This damage  
usually can be avoided by proper connection of the running  
capacitor terminals.  
From the supply line on a typical 230 volt circuit, a 115 volt  
potential exists from the “R” terminal to ground through a  
possible short in the capacitor. However, from the “S” or  
start terminal, a much higher potential, possibly as high as  
400 volts, exists because of the counter EMF generated  
in the start winding. Therefore, the possibility of capacitor  
failure is much greater when the identified terminal is  
connected to the “S” or start terminal. The identified  
terminal should always be connected to the supply line, or  
“R” terminal, never to the “S” terminal.  
DEFROST BULB LOCATION  
(All “WY” Electromechanical Control Models)  
The defrost control bulb must be mounted securely and in  
the correct location to operate properly (see Figure 11).  
Figure 11: Defrost Bulb Location  
(All “WY” Models)  
When connected properly, a shorted or grounded running  
capacitor will result in a direct short to ground from the “R”  
terminal and will blow the line fuse. The motor protector  
will protect the main winding from excessive temperature.  
Dual Rated Run Capacitor Hook-up  
F
C
H
16  
HEATING ELEMENT  
(“WE” &”WY” Electronic and Electromechanical Models)  
All “WE” and “WY” models are equipped with a 3.3 KW  
heating element.  
The heating element has two heater limit switches  
(bimetal thermostats) connected in series with it. The  
number 1 limit located near the bottom, will open the  
circuit when the temperature reaches 130°F +/-5°. The  
number 2 is a high limit switch near the top of the  
element. It is designed to open the circuit at 165°F +/-8°.  
Should the fan motor fail or filter become clogged etc.,  
the high limit switch will open and interrupt the power to  
the heater before reaching an unsafe temperature  
condition.  
Test the heater element for continuity below 130°F. The  
element’s resistance value is 13.7 Ohms +/-5%.  
Figure 12: Heating Element  
Not actual element - for reference only  
DRAIN PAN VALVE  
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 as-  
sists 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.  
Drain Pan Valve  
17  
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:  
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  
driertotrapanymoisturepresentinthesystem,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.  
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”  
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.  
3. “Flow is always from a higher pressure area to a lower  
pressure area.”  
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.  
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.  
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.  
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 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 WallMaster 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 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  
Discharge  
Line  
Condenser  
Coil  
Evaporator  
Coil  
Compressor  
Metering  
Device  
Refrigerant Drier  
Liquid  
Line  
Refrigerant  
Strainer  
18  
SEAlED REFRIGERATION SYSTEM REPAIRS  
IMPORTANT  
ANY SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.  
ALSO, ANY SEALED SYSTEM REPAIRS TO HEAT PUMP MODELS REQUIRE THE INSTALLATION OF A SUCTION LINE DRIER.  
EQUIPMENT REQUIRED:  
9. High Pressure Gauge - (0 - 400 lbs.)  
1. Voltmeter  
10. Low Pressure Gauge - (30 - 150 lbs.)  
2. Ammeter  
11. Vacuum Gauge - (0 - 1000 microns)  
3. Ohmmeter  
4. E.P.A. Approved Refrigerant Recovery System  
EQUIPMENT MUST BE CAPABLE OF:  
5. Vacuum Pump (capable of 200 microns or less  
vacuum.)  
1. Recovery CFC’s as low as 5%.  
2. Evacuation from both the high side and low side of the  
system simultaneously.  
6. Acetylene Welder  
7. Electronic Halogen Leak Detector (G.E. Type H-6 or  
equivalent.)  
3. Introducing refrigerant charge into high side of the  
system.  
8. Accurate refrigerant charge measuring device such  
as:  
4. Accurately weighing the refrigerant charge actually  
introduced into the system.  
a. Balance Scales - 1/2 oz. accuracy  
b. Charging Board - 1/2 oz. accuracy  
5. Facilities for flowing nitrogen through refrigeration tubing  
during all brazing processes.  
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.  
WARNING  
RISK OF ELECTRIC SHOCK  
Unplug and/or disconnect all electrical power  
to the unit before performing inspections,  
maintenances or service.  
Failure to do so could result in electric shock,  
serious injury or death.  
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.  
WARNING  
HIGH PRESSURE HAZARD  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
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.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
Failure to follow these procedures could  
result in serious injury or death.  
Refrigerant Charging  
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.  
NOTE: Because The WallMaster 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  
VacuumSystem. CrimpProcessTubeLineAndSolderEnd  
Shut. Do Not LeaveAService Valve In The Sealed System.  
19  
Method Of Charging / Repairs  
The acceptable method for charging the WallMaster 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  
sealedsystem. (Piercing valve must be removed from the  
system before recharging.)  
2. Recover Refrigerant in accordance with EPA regulations.  
WARNING  
BURN HAZARD  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with a torch.  
Failure to follow these procedures could  
result in moderate or serious injury.  
3. Install a process tube to sealed system.  
CAUTION  
FREEZE HAZARD  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with liquid refrigerant.  
Failure to follow these procedures could  
result in minor to moderate injury.  
4. Make necessary repairs to system.  
5. Evacuate system to 300 microns or less.  
6. Weigh in refrigerant with the property quantity of R-22  
refrigerant.  
7. Start unit, and verify performance.  
WARNING  
BURN HAZARD  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with a torch.  
Failure to follow these procedures could  
result in moderate or serious injury.  
8. Crimp the process tube and solder the end shut.  
20  
WARNING  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before service or  
installation.  
HIGH PRESSURE HAZARD  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
Extreme care must be used, if it becomes  
necessary to work on equipment with power  
applied.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
Failure to do so could result in serious injury or  
death.  
Failure to follow these procedures could  
result in serious injury or death.  
Undercharged Refrigerant Systems  
An undercharged system will result in poor performance  
(low pressures, etc.) in both the heating and cooling  
cycle.  
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.  
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.  
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 over charge). Suction pressure should be  
slightly higher.  
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 over charged  
system.  
An overcharge can cause the compressor to fail, since it  
would be “slugged” with liquid refrigerant.  
Thechargeforanysystemiscritical. Whenthecompressor  
is noisy, suspect an overcharge, when you are sure that  
the air quantity over the evaporator coil is correct. Icing  
21  
Restricted Refrigerant System  
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.  
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.  
A partial restriction allows some of the refrigerant to  
circulate through the system.  
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 is no circulation of  
refrigerant in the system.  
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 specifi cation. 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.  
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.  
The following conditions are based primarily on a system  
in the cooling mode.  
A quick check for either condition begins at the evaporator.  
With a partial restriction, there may be gurgling sounds  
22  
HERMETIC COMPONENTS CHECK  
WARNING  
BURN HAZARD  
WARNING  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with a torch.  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to follow these procedures could  
result in moderate or serious injury.  
Failure to do so could result in serious injury.  
METERING DEVICE  
Capillary Tube Systems  
All units are equipped with capillary tube metering  
devices.  
3. Switch the unit to the heating mode and observe the  
gauge readings after a few minutes running time. If  
the system pressure is lower than normal, the heating  
capillary is restricted.  
Checking for restricted capillary tubes.  
1. Connect pressure gauges to unit.  
4. If the operating pressures are lower than normal in both  
the heating and cooling mode, the cooling capillary is  
restricted.  
2. Start the unit in the cooling mode. If after a few minutes  
of operation the pressures are normal, the check valve  
and the cooling capillary are not restricted.  
CHECK VAlVE  
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.  
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.  
COOLING MODE  
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).  
One-way Check Valve  
(Heat Pump Models)  
HEATING MODE  
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.  
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).  
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.  
23  
REVERSING VAlVE DESCRIPTION/OPERATION  
WARNING  
ELECTRIC SHOCK HAZARD  
Disconnect power to the unit before servicing.  
Failure to follow this warning could result in  
serious injury or death.  
The Reversing Valve controls the direction of refrigerant  
“A”and“B”portsofthepilotvalve.Athirdcapillaryisacommon  
return line from these ports to the suction tube on the main  
valve body. Four-way reversing valves also have a capillary  
tube from the compressor discharge tube to the pilot valve.  
flow to the indoor and outdoor coils. It consists of a  
pressure-operated, main valve and a pilot valve actuated  
by a solenoid plunger. The solenoid is energized during the  
heating cycle only. The reversing valves used in the RAC  
system is a 2-position, 4-way valve.  
The piston assembly in the main valve can only be shifted  
by the pressure differential between the high and low sides  
of the system. The pilot section of the valve opens and  
closes ports for the small capillary tubes to the main valve  
to cause it to shift.  
The single tube on one side of the main valve body is the  
high-pressure inlet to the valve from the compressor. The  
center tube on the opposite side is connected to the low  
pressure (suction) side of the system. The other two are  
connected to the indoor and outdoor coils. Small capillary  
tubes connect each end of the main valve cylinder to the  
NOTE: System operating pressures must be near  
normal before valve can shift.  
24  
TESTING THE COIl  
pressure to build in the system. Then switch the system  
from heating to cooling.  
WARNING  
ELECTRIC SHOCK HAZARD  
Unplug and/or disconnect all electrical power  
to the unit before performing inspections,  
maintenances or service.  
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.  
Failure to do so could result in electric shock,  
serious injury or death.  
Should the valve fail to shift in either position after  
increasing the discharge pressure, replace the valve.  
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.  
Dented or damaged valve body or capillary tubes can  
prevent the main slide in the valve body from shifting.  
1. Turn off high voltage electrical power to unit.  
If you determing this is the problem, replace the reversing  
valve.  
2. Unplug line voltage lead from reversing valve coil.  
3. Check for electrical continuity through the coil. If you  
do not have continuity replace the coil.  
After all of the previous inspections and checks have  
been made and determined correct, then perform the  
“Touch Test” on the reversing valve.  
4. Check from each lead of coil to the copper liquid line  
as it leaves the unit or the ground lug. There should  
be no continuity between either of the coil leads  
and ground; if there is, coil is grounded and must be  
replaced.  
5. If coil tests okay, reconnect the electrical leads.  
6. Make sure coil has been assembled correctly.  
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.  
CHECKING THE REVERSING VAlVE  
NOTE: You must have normal operating pressures before  
the reversing valve can shift.  
WARNING  
HIGH PRESSURE HAZARD  
Reversing Valve in Heating Mode  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
Failure to follow these procedures could  
result in serious injury or death.  
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.  
Occasionally, the reversing valve may stick in the heating  
or cooling position or in the mid-position.  
When sluggish or 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.  
Should the valve fail to shift from coooling to heating, block  
the air flow through the outdoor coil and allow the discharge  
25  
Touch Test in Heating/Cooling Cycle  
6. Protectnewvalvebodyfromheatwhilebrazingwith plastic  
heat sink (Thermo Trap) or wrap valve body with wet  
rag.  
WARNING  
BURN HAZARD  
Certain unit components operate at  
temperatures hot enough to cause burns.  
7. Fit all lines into new valve and braze lines into new  
valve.  
Proper safety procedures must be followed,  
and proper protective clothing must be  
worn.  
WARNING  
EXPLOSION HAZARD  
Failure to follow these procedures could  
result in minor to moderate injury.  
The use of nitrogen requires a pressure  
regulator. Follow all safety procedures and  
wear protective safety clothing etc.  
The only definite indications that the slide is in the mid-  
position is if all three tubes on the suction side of the valve  
are hot after a few minutes of running time.  
Failure to follow proper safety procedures  
could result in serious injury or death.  
8. Pressurize sealed system with a combination of R-22  
and nitrogen and check for leaks, using a suitable leak  
detector. Recover refrigerant per EPA guidelines.  
NOTE: A condition other than those illustrated above, and  
on Page 31, indicate that the reversing valve is not shifting  
properly. Both tubes shown as hot or cool must be the same  
corresponding temperature.  
9. Once the sealed system is leak free, install solenoid coil  
on new valve and charge the sealed system by weighing  
in the proper amount and type of refrigerant as shown  
on rating plate. Crimp the process tubes and solder the  
ends shut. Do not leave Schrader or piercing valves in  
the sealed system.  
Procedure For Changing Reversing Valve  
WARNING  
HIGH PRESSURE HAZARD  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
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.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
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.  
Failure to follow these procedures could  
result in serious injury or death.  
The wet rag around the reversing valve will eliminate  
conduction of heat to the valve body when brazing the line  
connection.  
NOTICE  
FIRE HAZARD  
The use of a torch requires extreme care and proper  
judgment. Follow all safety recommended precautions  
and protect surrounding areas with fire proof materials.  
Have a fire extinguisher readily available. Failure to follow  
this notice could result in moderate to serious property  
damage.  
1. Install Process Tubes. Recover refrigerant from sealed  
system. PROPER HANDLING OF RECOVERED  
REFRIGERANT ACCORDING TO EPA REGULATIONS  
IS REQUIRED.  
2. Remove solenoid coil from reversing valve. If coil is to  
be reused, protect from heat while changing valve.  
3. Unbraze all lines from reversing valve.  
4. Clean all excess braze from all tubing so that they will  
slip into fittings on new valve.  
5. Remove solenoid coil from new valve.  
26  
COMPRESSOR CHECKS  
External Overload  
WARNING  
ELECTRIC SHOCK HAZARD  
The compressor is equipped with an external overload  
which senses both motor amperage and winding tem-  
perature. High motor temperature or amperage heats the  
overload causing it to open, breaking the common circuit  
within the compressor.  
Turn off electric power before service or  
installation. Extreme care must be used, if it  
becomes necessary to work on equipment with  
power applied.  
Heat generated within the compressor shell, usually due  
to recycling of the motor, is slow to dissipate. It may take  
anywhere from a few minutes to several hours for the  
overload to reset.  
Failure to do so could result in serious injury or  
death.  
locked Rotor Voltage (l.R.V.) Test  
Locked rotor voltage (L.R.V.) is the actual voltage available  
at the compressor under a stalled condition.  
Checking the External Overload  
Single Phase Connections  
Disconnect power from unit. Using a voltmeter, attach one  
lead of the meter to the run “R” terminal on the compressor  
and the other lead to the common “C” terminal of the com-  
pressor. Restore power to unit.  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before service or  
installation. Extreme care must be used, if it  
becomes necessary to work on equipment  
with power applied.  
Determine l.R.V.  
Start the compressor with the volt meter attached; then stop  
the unit. Attempt to restart the compressor within a couple  
of seconds and immediately read the voltage on the meter.  
The compressor under these conditions will not start and will  
usually kick out on overload within a few seconds since the  
pressures in the system will not have had time to equalize.  
Voltage should be at or above minimum voltage of 197 VAC,  
as specified on the rating plate. If less than minimum, check  
for cause of inadequate power supply; i.e., incorrect wire  
size, loose electrical connections, etc.  
Failure to do so could result in serious injury or  
death.  
WARNING  
BURN HAZARD  
Certain unit components operate at  
temperatures hot enough to cause burns.  
Proper safety procedures must be followed,  
and proper protective clothing must be  
worn.  
Amperage (l.R.A.) Test  
The running amperage of the compressor is the most impor-  
tant of these readings. A running amperage higher than that  
indicated in the performance data indicates that a problem  
exists mechanically or electrically.  
Failure to follow this warning could result  
in moderate to serious injury.  
With power off, remove the leads from compressor termi-  
nals. If the compressor is hot, allow the overload to cool  
before starting check. Using an ohmmeter, test continu-  
ity across the terminals of the external overload. If you  
do not have continuity; this indicates that the overload is  
open and must be replaced.  
Single Phase Running and L.R.A. Test  
NOTE: Consult the specification and performance section  
for running amperage. The L.R.A. can also be found on the  
rating plate.  
Select the proper amperage scale and clamp the meter  
probe around the wire to the “C” terminal of the compressor.  
Turn on the unit and read the running amperage on the me-  
ter. If the compressor does not start, the reading will indicate  
the locked rotor amperage (L.R.A.).  
27  
Single Phase Resistance Test  
Many compressor failures are caused by the following  
conditions:  
WARNING  
ELECTRIC SHOCK HAZARD  
1. Improper air flow over the evaporator.  
Turn off electric power before service or  
2. Overcharged refrigerant system causing liquid to be  
returned to the compressor.  
installation. Extreme care must be used, if it  
becomes necessary to work on equipment  
with power applied.  
3. Restricted refrigerant system.  
4. Lack of lubrication.  
Failure to do so could result in serious injury or  
death.  
Remove the leads from the compressor terminals and set  
the ohmmeter on the lowest scale (R x 1).  
5. Liquid refrigerant returning to compressor causing oil  
to be washed out of bearings.  
Touch the leads of the ohmmeter from terminals common  
to start (“C” to “S”). Next, touch the leads of the ohmmeter  
from terminals common to run (“C” to “R”).  
6.  
Noncondensables such as air and moisture in  
the system. Moisture is extremely destructive to a  
refrigerant system.  
Add values “C” to “S” and “C” to “R” together and  
check resistance from start to run terminals (“S” to “R”).  
Resistance “S” to “R” should equal the total of “C” to “S”  
and “C” to “R.”  
7. Capacitor test (see page 21).  
CHECKING COMPRESSOR EFFICIENCY  
In a single phase PSC compressor motor, the highest  
value will be from the start to the run connections (“S” to  
“R”). The next highest resistance is from the start to the  
common connections (“S” to “C”). The lowest resistance  
is from the run to common. (“C” to “R”) Before replacing a  
compressor, check to be sure it is defective.  
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:  
1. Install a piercing valve on the suction and discharge or  
liquid process tube.  
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. If a reading is obtained the  
compressor is grounded and must be replaced.  
2. Attach gauges to the high and low sides of the system.  
3. Start the system and run a “cooling or heating perfor-  
mance test.” If test shows:  
Check the complete electrical system to the compressor  
and compressor internal electrical system, check to be  
certain that compressor is not out on internal overload.  
A. Below normal high side pressure  
B. Above normal low side pressure  
C. Low temperature difference across coil  
Complete evaluation of the system must be made  
whenever you suspect the compressor is defective. If  
the compressor has been operating for sometime, a  
careful examination must be made to determine why the  
compressor failed.  
The compressor valves are faulty - replace the  
compressor.  
28  
COMPRESSOR REPlACEMENT  
Recommendedprocedureforcompressor  
replacement  
3. After all refrigerant has been recovered, disconnect  
suction and discharge lines from the compressor and  
remove compressor. Be certain to have both suction  
and discharge process tubes open to atmosphere.  
WARNING  
4. Carefully pour a small amount of oil from the suction  
RISK OF ELECTRIC SHOCK  
Unplug and/or disconnect all electrical power  
to the unit before performing inspections,  
maintenances or service.  
stub of the defective compressor into a clean  
container.  
5. Using an acid test kit (one shot or conventional kit), test  
the oil for acid content according to the instructions  
with the kit.  
Failure to do so could result in electric shock,  
serious injury or death.  
6. If any evidence of a burnout is found, no matter how  
slight, the system will need to be cleaned up following  
proper procedures.  
1. Be certain to perform all necessary electrical and  
refrigeration tests to be sure the compressor is  
actually defective before replacing.  
7. Install the replacement compressor.  
WARNING  
WARNING  
HIGH PRESSURE HAZARD  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
EXPLOSION HAZARD  
The use of nitrogen requires a pressure  
regulator. Follow all safety procedures and  
wear protective safety clothing etc.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
Failure to follow proper safety procedures  
result in serious injury or death.  
Failure to follow these procedures could  
result in serious injury or death.  
8. Pressurize with a combination of R-22 and nitrogen  
and leak test all connections with an electronic or  
Halide leak detector. Recover refrigerant and repair  
any leaks found.  
2. Recover all refrigerant from the system though  
the process tubes. PROPER HANDLING OF  
RECOVERED REFRIGERANT ACCORDING TO  
EPA REGULATIONS IS REQUIRED. Do not use  
gauge manifold for this purpose if there has been  
a burnout. You will contaminate your manifold and  
hoses. Use a Schrader valve adapter and copper  
tubing for burnout failures.  
Repeat Step 8 to insure no more leaks are present.  
9. Evacuate the system with a good vacuum pump capable  
of a final vacuum of 300 microns or less. The system  
should be evacuated through both liquid line and suction  
line gauge ports. While the unit is being evacuated, seal  
all openings on the defective compressor. Compressor  
manufacturers will void warranties on units received not  
properly sealed. Do not distort the manufacturers tube  
connections.  
WARNING  
HIGH TEMPERATURES  
Extreme care, proper judgment and all safety  
procedures must be followed when testing,  
troubleshooting, handling or working around  
unit while in operation with high temperature  
components. Wear protective safety aids  
such as: gloves, clothing etc.  
CAUTION  
FREEZE HAZARD  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with liquid refrigerant.  
Failure to do so could result in serious burn  
injury.  
Failure to follow these procedures could  
result in minor to moderate injury.  
NOTICE  
FIRE HAZARD  
10. Recharge the system with the correct amount of  
refrigerant. The proper refrigerant charge will be  
found on the unit rating plate. The use of an accurate  
measuring device, such as a charging cylinder,  
The use of a torch requires extreme care and proper  
judgment. Follow all safety recommended precautions  
and protect surrounding areas with fire proof materials.  
Have a fire extinguisher readily available. Failure to follow  
this notice could result in moderate to serious property  
damage.  
electronic scales or similar device is necessary.  
29  
SPECIAL PROCEDURE IN THE CASE OF MOTOR  
COMPRESSOR BURNOUT  
WARNING  
ELECTRIC SHOCK HAZARD  
Turn off electric power before service or  
installation.  
Failure to do so may result in personal injury,  
or death.  
WARNING  
HIGH PRESSURE HAZARD  
SealedRefrigerationSystemcontainsrefrigerant  
and oil under high pressure.  
Proper safety procedures must be followed,  
and proper protective clothing must be worn  
when working with refrigerants.  
Failure to follow these procedures could  
result in serious injury or death.  
WARNING  
EXPLOSION HAZARD  
The use of nitrogen requires a pressure  
regulator. Follow all safety procedures and  
wear protective safety clothing etc.  
Failure to follow proper safety procedures  
result in serious injury or death.  
1.  
Recover all refrigerant and oil from the system.  
Remove compressor, capillary tube and filter drier  
from the system.  
2.  
3.  
Flush evaporator condenser and all connecting  
tubing with dry nitrogen or equivalent. Use approved  
flushing agent to remove all contamination from  
system. Inspect suction and discharge line for  
carbon deposits. Remove and clean if necessary.  
Ensure all acid is neutralized.  
4. Reassemble the system, including new drier strainer  
and capillary tube.  
5. Proceed with step 8-10 on previous page.  
ROTARY COMPRESSOR SPECIAL TROUBLESHOOTING  
AND SERVICE  
Basically, troubleshooting and servicing rotary compres-  
sors is the same as on the reciprocating compressor with  
only one main exception:  
NEVER, under any circumstances, charge a rotary com-  
pressor through the LOW side. Doing so would cause  
permanent damage to the new compressor.  
30  
ROUTINE MAINTENANCE  
NOTICE  
WARNING  
Units are to be inspected and serviced by qualified service  
personnel only. Use proper protection on surrounding  
property. Failure to follow this notice could result in  
moderate or serious property damage.  
ELECTRIC SHOCK HAZARD  
Turn off electric power before inspections,  
maintenances, or service.  
Extreme care must be used, if it becomes  
necessary to work on equipment with power  
applied.  
Failure to do so could result in serious injury  
or death.  
AIR FILTER  
Clean the unit air intake filter at least every 300 to 350 hours of operation. Clean the filters with a mild detergent in  
warm water and allow to dry thoroughly before reinstalling.  
COILS AND BASE PAN  
WARNING  
NOTICE  
EXCESSIVE WEIGHT HAZARD  
Use two people to lift or carry the unit, and wear  
proper protective clothing.  
Do not use a caustic coil cleaning agent on coils or base  
pan. Use a biodegradable cleaning agent and degreaser,  
to prevent damage to the coil and/or base pan.  
Failure to do so may result in personal injury.  
WARNING  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
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.  
BLOWER WHEEL / HOUSING / CONDENSER FAN / SHROUD  
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.  
ELECTRONIC / ELECTRICAL / MECHANICAL  
Periodically (at least yearly or bi-yearly): inspect all control components: electronic, electrical and mechanical, as well  
as the power supply. Use proper testing instruments (voltmeter, ohmmeter, ammeter, wattmeter, etc.) to perform elec-  
trical tests. Use an air conditioning or refrigeration thermometer to check room, outdoor and coil operating tempera-  
tures. Use a sling psychrometer to measure wet bulb temperatures indoors and outdoors.  
Inspect the surrounding area (inside and outside) to ensure that the unit’s clearances have not been compromised or  
altered.  
31  
ROUTINE MAINTENANCE (Continued)  
NOTICE  
Do not drill holes in the bottom of the drain pan or the  
underside of the unit. Not following this notice could  
result in damage to the unit or condensate water leaking  
inappropriately which could cause water damage to  
surrounding property.  
SLEEVE / DRAIN  
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.  
FRONT COVER  
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.  
1” Diameter Plug  
WSC  
Sleeve  
Airflow  
Decorative  
Front  
7
6
5
3
C
6
5
4
3
2
1
B
A
B
0
1
A
7
0
S
W
#
L
E
D
O
M
Discharge  
Grille  
Return  
Air Grille  
32  
COOlING ONlY ROOM AIR CONDITIONERS: TROUBlESHOOTING TIPS  
Problem  
Possible Cause  
Low voltage  
Action  
Check voltage at compressor. 115V & 230V  
units will operate at 10% voltage variance  
Set t-stat to coldest position. Test t-stat & re-  
place if inoperative  
T-stat not set cold enough or  
inoperative  
Compressor hums but cuts off on  
overload  
Hard start compressor. Direct test compressor.  
If compressor starts, add starting components  
Open or shorted compressor  
windings  
Compressor  
does not run  
Check for continuity & resistance  
Open overload  
Test overload protector & replace if inoperative  
Test capacitor & replace if inoperative  
Test for continuity in all positions. Replace if  
inoperative  
Open capacitor  
Inoperative system switch  
Refer to appropriate wiring diagrams to check  
wiring  
Broken, loose or incorrect wiring  
Problem  
Possible Cause  
Inoperative system switch  
Broken, loose or incorrect wiring  
Open capacitor  
Action  
Test switch & replace if inoperative  
Refer to applicable wiring diagram  
Test capacitor & replace if inoperative  
Test switch & replace if inoperative  
Test fan motor & replace if inoperative (be sure  
internal overload has had time to reset)  
Fan motor  
does not run  
Fan speed switch open  
Inoperative fan motor  
Problem  
Possible Cause  
Action  
Undersized unit  
Refer to industry standard sizing chart  
Set to coldest position. Test t-stat & replace if  
necessary  
T-stat open or inoperative  
Dirty filter  
Clean as recommended in Owner’s Manual  
Use pressure wash or biodegradable cleaning  
agent to clean  
Dirty or restricted condenser or  
evaporator coil  
Does not cool or  
only cools slightly  
Poor air circulation  
Adjust discharge louvers. Use high fan speed  
Close doors. Instruct customer on use of this  
feature  
Fresh air or exhaust air door open  
on applicable models  
Low capacity - undercharge  
Check for leak & make repair  
Check amperage draw against nameplate. If  
not conclusive, make pressure test  
Compressor not pumping properly  
33  
Problem  
Possible Cause  
Action  
Replace fuse, reset breaker. If repeats, check  
fuse or breaker size. Check for shorts in unit  
wiring & components  
Fuse blown or circuit tripped  
Power cord not plugged in  
Plug it in  
System switch in “OFF” position  
Set switch correctly  
Unit does not run  
Inoperative system switch or open  
control board  
Test for continuity  
Loose or disconnected wiring at  
Check wiring & connections. Reconnect per  
wiring diagram  
switch, control board or other com-  
ponents  
Problem  
Possible Cause  
Action  
Dirty filter  
Clean as recommended in Owner’s Manual  
Check for dirty or obstructed coil. Use  
pressure wash or biodegradable cleaning  
agent to clean  
Restricted airflow  
Inoperative t-stat or thermistors  
Short of refrigerant  
Test for continuity  
Evaporator coil  
freezes up  
De-ice coil & check for leak  
Inoperative fan motor  
Test fan motor & replace if inoperative  
De-ice coil. Check temp. differential (delta T)  
across coil. Touch test coil return bends for  
same temp. Test for low running current  
Partially restricted capillary tube  
Problem  
Possible Cause  
Action  
Unit undersized. Test cooling performance &  
replace with larger unit if needed  
Check for partially iced coil & check  
temperature split across coil  
Excessive heat load  
Restriction in line  
Refrigerant leak  
Check for oil at silver soldered connections.  
Check for partially iced coil. Check split across  
coil. Check for low running amperage  
Check operation of t-stat. Replace if contacts  
remain closed.  
Compressor runs  
continually & does  
not cycle off  
T-stat contacts stuck  
T-stat incorrectly wired  
Thermistor shorted  
Refer to appropriate wiring diagram  
Replace thermistor or electronic control board  
Problem  
Possible Cause  
Action  
Disconnect power to unit. Remove cover  
of t-stat & check if contacts are stuck. If so,  
replace t-stat  
T-stat contacts stuck  
Turn to higher temp. setting to see if unit  
cycles off  
T-stat set at coldest point  
Incorrect wiring  
T-stat does not  
turn unit off  
Refer to appropriate wiring diagrams  
Refer to industry standard sizing chart  
Replace thermistor or electronic control board  
Unit undersized for area to be  
cooled  
Defective thermistor  
34  
Problem  
Possible Cause  
Overload inoperative. Opens too  
soon  
Action  
Check operation of unit. Replace overload if  
system operation is satisfactory  
Allow a minimum of 2 minutes to allow  
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 in separate circuit for proper voltage  
& fused separately  
Compressor restarted before  
system pressures equalized  
Compressor runs  
for short periods  
only. Cycles on  
overload  
Low or fluctuating voltage  
Incorrect wiring  
Refer to appropriate wiring diagram  
Check by substituting a known good capacitor  
of correct rating  
Shorted or incorrect capacitor  
Restricted or low air flow through  
Check for proper fan speed or blocked  
coils  
condenser coil or evaporator coil  
Check for kinked discharge line or restricted  
condenser. Check amperage  
Compressor running abnormally  
hot  
Problem  
Possible Cause  
Action  
Place jumper across t-stat terminals to check if  
unit operates. If unit operates, replace t-stat.  
Check as above  
Loss of charge in t-stat bulb  
T-stat does not  
turn unit on  
Loose or broken parts in t-stat  
Incorrect wiring  
Refer to appropriate wiring diagram  
Replace thermistor or electronic control board  
Defective thermistor  
Problem  
Possible Cause  
Poorly installed  
Action  
Refer to Installation Manual for proper  
installation  
Fan blade striking chassis  
Reposition - adjust motor mount  
Check that compressor grommets have not  
deteriorated. Check that compressor mounting  
parts are not missing  
Noisy operation  
Compressor vibrating  
Improperly mounted or loose  
cabinet parts  
Check assembly & parts for looseness,  
rubbing & rattling  
Problem  
Possible Cause  
Action  
Evaporator drain pan overflowing  
Clean obstructed drain trough  
Evaporator drain pan broken or cracked.  
Reseal or replace. No chassis gasket installed.  
Install chassis gasket  
Condensation forming on base pan  
Poor installation resulting in rain  
entering the room  
Check installation instructions. Reseal as  
required  
Water leaks into  
the room  
Dirty evaporator coil. Use pressure wash  
or biodegradable cleaning agent to clean.  
Environmental phenomena: point supply  
louvers upward  
Condensation on discharge grille  
louvers  
Chassis gasket not installed  
Downward slope of unit is too  
steep inward  
Install gasket, per Installation manual  
Refer to installation manual for proper  
installation  
35  
Problem  
Possible Cause  
Sublimation:  
Action  
Ensure that foam gaskets are installed in  
between window panes & in between the  
unit & the sleeve. Also, ensure that fresh  
air/exhaust vents (on applicable models) are in  
the closed position & are in tact  
When unconditioned saturated,  
outside air mixes with conditioned  
air, condensation forms on the  
cooler surfaces  
Water “spitting”  
into room  
Follow installation instructions to ensure that  
downward pitch of installed unit is no less than  
1/4” & no more than 3/8”  
Downward pitch of installation is  
too steep towards back of unit  
Clean & advise customer of periodic cleaning  
& maintenance needs of entire unit  
Restricted coil or dirty filter  
Problem  
Possible Cause  
Insufficient air circulation thru area  
to be air conditioned  
Action  
Adjust louvers for best possible air circulation  
Operate in “MoneySaver” position  
Advise customer  
Excessive  
moisture  
Oversized unit  
Inadequate vapor barrier in building  
structure, particularly floors  
Problem  
Possible Cause  
Defective thermistor  
Action  
Replace thermistor or electronic control board  
Replace t-stat  
T-stat differential too narrow  
Plenum gasket not sealing,  
allowing discharge air to short  
cycle t-stat  
T-stat or  
thermistor  
short cycles  
Check gasket. Reposition or replace as  
needed  
Clean & advise customer of periodic cleaning  
& maintenance needs of entire unit  
Restricted coil or dirty filter  
Problem  
Possible Cause  
Heat anticipator (resistor) wire  
disconnected at t-stat or system  
switch  
Action  
Refer to appropriate wiring diagram  
Disconnect plus from outlet. Remove resistor  
from bracket. Insert plug & depress “COOL”  
& “FAN AUTOMATIC” buttons. Place t-stat to  
warmest setting. Feel resistor for temperature.  
If no heat, replace resistor  
Prolonged off  
cycles (automatic  
operation)  
Heat anticipator (resistor) shorted or  
open  
Partial loss of charge in t-stat bulb  
causing a wide differential  
Replace t-stat  
Defective thermistor  
Replace thermistor or electronic control board  
Problem  
Possible Cause  
Evaporator drain pan cracked or  
obstructed  
Action  
Repair, clean or replace as required  
Detach shroud from pan & coil. Clean &  
remove old sealer. Reseal, reinstall & check  
Use pressure wash or biodegradable cleaning  
agent to clean  
Water in compressor area  
Obstructed condenser coil  
Outside water  
leaks  
Fan blade/slinger ring improperly  
positioned  
Adjust fan blade to 1/2” of condenser coil fin  
pack  
36  
HEAT PUMP TROUBlESHOOTING  
Problem  
Possible Cause  
Action  
Disconnect power to unit. Remove resistor  
from t-stat bulb block. Plus in unit & allow to  
operate. Feel resistor for heat. If not heat,  
replace resistor  
Heat anticipator (resistor) shorted  
(on applicable models)  
Room  
temperature  
uneven  
Wide differential - partial loss of  
t-stat bulb charge  
Replace t-stat & check  
Refer to appropriate wiring diagram. Resistor  
is energized during “ON” cycle of compressor  
or fan.  
(Heating cycle)  
Incorrect wiring  
Defective thermistor or control board Replace thermistor or electronic control board  
Problem  
Possible Cause  
Incorrect wiring  
Action  
Refer to appropriate wiring diagram  
If outside coil temperature is 25°F or below,  
& preselected time limit has elapsed, replace  
defrost control  
Defrost control out of calibration  
(applicable models)  
If contacts remain closed between terminals  
“2” & “3” of the defrost control after  
preselected time interval has passed, replace  
control  
Unit will not  
Defrost control contacts stuck  
defrost  
Defrost control bulb removed from  
or not making good coil contact  
Reinstall & be assured that good bulb to coil  
contact is made  
Outdoor coil thermistor  
Replace thermistor or electronic control board  
Problem  
Possible Cause  
Action  
Dirty filter  
Clean as recommended in Owner’s Manual  
Check heat rise across coil. If unit operates  
efficiently, check if insulation can be added  
to attic or walls. If insulation is adequate,  
recommend additional unit or larger one  
T-stat should close at 38°F. Check continuity  
Unit undersized  
Outdoor t-stat open (applicable  
models)  
Does not heat  
adequately  
of control. If temperature is below 38°F,  
replace control  
Check for adequate fan air across heater.  
Check control for open at 160°F & close at  
150°F  
Heater hi-limit control cycling on &  
off  
Shorted supplementary heater  
Incorrect wiring  
Ohmmeter check, approx. 32-35 ohms  
Check applicable wiring diagram  
Defective thermistor or electronic  
control board  
Replace thermistor or electronic control board  
37  
HEAT PUMP TROUBlESHOOTING  
Problem  
Possible Cause  
Incorrect wiring  
Action  
Refer to applicable wiring diagram  
Check for continuity of coil  
Defective solenoid coil  
Block condenser coil & switch unit to cooling.  
Allow pressure to build up in system, then  
switch to heating. If valve fails to shift, replace  
valve.  
Unit cools when  
heat is called for  
Reversing valve fails to shift  
Inoperative system switch or defrost  
thremostat or outdoor thermistor or  
electronic board  
Check for continuity. Replace defective  
component.  
Problem  
Possible Cause  
Heating capillary tube partially  
restricted  
Action  
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 specifi cation sheet for correct  
temperature rise  
Heating  
insufficient  
Check valve leaking internally  
Deenergize solenoid coil, raise head pressure,  
energize solenoid to break loose. If valve fails  
to make complete shift, replace valve.  
Reversing valve failing to shift  
completely; bypassing hot gas  
38  
TROUBlESHOOTING TOUCH TEST CHART: TO SERVICE REVERSING VAlVES  
NORMAL FUNCTION OF VALVE  
NOTES:  
VALVE  
OPERATING  
CONDITION  
* TEMPERATURE OF VALVE BODY  
** WARMER THAN VALVE BODY  
1
2
3
4
5
6
POSSIBLE CAUSES  
CORRECTIONS  
Cool  
as (2)  
Hot  
as (1)  
Hot  
Cool  
*TVB  
TVB  
Normal Cooling  
Normal Heating  
Hot  
as (1)  
Cool  
as (2)  
Hot  
Cool  
*TVB  
TVB  
MALFUNCTION OF VALVE  
No voltage to coil.  
Repair electrical circuit.  
Check Electrical circuit and coil  
Check refrigeration charge  
Defective coil.  
Replace coil.  
Low charge.  
Repair leak, recharge system.  
Recheck system.  
Pressure differential too high.  
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.  
Valve will not  
shift from cool  
to heat.  
Cool,  
as (2)  
Hot,  
as (1)  
Hot  
Cool  
*TVB  
Hot  
Pilot valve okay. Dirt in one bleeder hole.  
Stop unit. After pressures equalize, restart  
with solenoid energized. If valve shifts,  
reattempt with compressor running. If still  
no shift, replace valve.  
Piston cup leak  
Cool,  
as (2)  
Hot,  
as (1)  
Raise head pressure, operate solenoid to  
free. If still no shift, replace valve.  
Hot  
Hot  
Cool  
Cool  
*TVB  
Hot  
*TVB  
Hot  
Clogged pilot tubes.  
Raise head pressure, operate solenoid  
to free  
partially clogged port. If still no shift,  
replace  
valve.  
Valve will not  
shift from cool  
to heat.  
Cool,  
as (2)  
Hot,  
as (1)  
Both ports of pilot open. (Back seat port  
did not close).  
Cool,  
as (2)  
Hot,  
as (1)  
Warm  
Hot  
Cool  
*TVB  
*TVB  
Warm  
Hot  
Defective Compressor.  
Replace compressor  
Not enough pressure differential at start  
of stroke or not enough fl ow to maintain and charge. Raise head pressure. If no  
Check unit for correct operating pressures  
Warm  
Warm  
Hot  
pressure differential.  
shift, use valve with smaller port.  
Body damage.  
Replace valve  
Starts to shift  
but does not  
complete  
Raise head pressure, operate solenoid. If  
no shift, use valve with smaller ports.  
Hot  
Hot  
Warm  
Hot  
Warm  
Hot  
Hot  
Hot  
Hot  
Hot  
Hot  
Both ports of pilot open.  
Body damage.  
*TVB  
Replace valve  
Valve hung up at mid-stroke. Pumping  
volume of compressor not suffi cient to  
maintain reversal.  
reversal.  
Raise head pressure, operate solenoid. If  
no shift, use valve with smaller ports.  
Raise head pressure, operate solenoid.  
Hot  
Hot  
Hot  
Hot  
Hot  
Hot  
Both ports of pilot open.  
If no  
shift, replace valve.  
Hot,  
as (1)  
Cool,  
as (2)  
Operate valve several times, then recheck.  
If excessive leak, replace valve.  
Apparent  
leap in heat-  
ing.  
Hot  
Hot  
Hot  
Cool  
Cool  
Cool  
*TVB  
**WVB  
*TVB  
*TVB  
**WVB  
*TVB  
Piston needle on end of slide leaking.  
Pilot needle and piston needle leaking.  
Pressure differential too high.  
Clogged pilot tube.  
Hot,  
as (1)  
Cool,  
as (2)  
Operate valve several times, then recheck.  
If excessive leak, replace valve.  
Hot,  
as (1)  
Cool,  
as (2)  
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.  
Hot,  
as (1)  
Cool,  
as (2)  
Hot  
Hot  
Cool  
Cool  
Hot  
Hot  
*TVB  
*TVB  
Dirt in bleeder hole.  
Piston cup leak.  
Will not shift  
from heat to  
cool.  
Stop unit. After pressures equalize, restart  
with solenoid deenergized. If valve shifts,  
reattempt with compressor running. If it  
still will not reverse while running, replace  
the valve.  
Hot,  
as (1)  
Cool,  
as (2)  
1
Hot,  
as (1)  
Cool,  
as (2)  
Hot  
Cool  
Cool  
Hot  
Hot  
Defective pilot.  
Replace valve.  
Warm,  
as (1)  
Cool,  
as (2)  
Warm  
Warm  
*TVB  
Defective compressor.  
Replace compressor  
39  
wAllMASTER wIRING DIAGRAM  
ElECTRONIC CONTROl  
COOl ONlY MODElS:  
wS08B10A-D,A-F wS10BIOA-D wS14B10A-D  
wS14B10A-E  
wS10B30A-D  
wS13B30B-E,B-F wS16B30A-D,A-E  
40  
wAllMASTER wIRING DIAGRAM  
ElECTRONIC CONTROl  
COOl wITH ElECTRIC HEAT MODElS:  
wE10B33C-A wE13B33C-A wE16B33C-A  
41  
wAllMASTER wIRING DIAGRAM  
ElECTRONIC CONTROl  
HEAT PUMP wITH ElECTRIC HEAT MODElS:  
wY10B33C-A wY13B33C-A  
42  
wAllMASTER wIRING DIAGRAM  
ElECTROMECHANICAl CONTROl  
COOl wITH ElECTRIC HEAT MODElS:  
wE10B33A-C wE13B33B-D,B-E wE16B33A-C,A-D  
43  
wAllMASTER wIRING DIAGRAM  
ElECTROMECHANICAl CONTROl  
HEAT PUMP wITH ElECTRIC HEAT MODElS:  
wY10B33A-C,A-D wY13B33A-C,A-D  
44  
Installation Accessories  
DK / Drain Kit  
SB / Sub Base  
IDK / Internal Drain Kit  
New construction applications where  
a condensate drain system has been  
built into the wall interior.  
Installed at the back of the unit and allows  
for attachment to permanent condensate  
disposal system, if disposal is necessary  
or desired.  
Used as a base for the unit when  
it is desired to place the cord and  
receptacle within the installation, or  
simply as a base for the unit when  
mounted low in the wall.  
Necessary when installing in a sleeve  
deeper than 16 3/4" deep, such as  
Fedders B sleeve (19 3/4" deep).  
163
/4"  
FeddersB  
193
/4”  
Exterior Grilles  
CORRECT Vertical Louvers  
IMPORTANT:  
Operating the air  
conditioner with incorrect  
Adapter Kit (on 19 3/4”  
deep sleeve) will recirculate  
discharge air and cause  
compressor overload to trip.  
INCORRECT Horizontal Louvers  
Optional Architectural Grille- AG  
WSC Sleeve  
Standard Grille  
45  
INSTALLATION INSTRUCTIONS  
FOR “WSC” SLEEVE  
MOUNTING HARDWARE PROVIDED  
ITEM  
DESCRIPTION  
QTY.  
NO.  
1
SCREW, #12A X 2”  
5
WALL PREPARATION:  
STEP 1 The wall opening required for a “WSC” SLEEVE is 17 1/4” high by 27 1/4” wide.  
STEP 2 LINTELS must be used in opening of brick veneer and masonry walls to support the material above the “WSC”  
SLEEVE. The following considerations should also be given:  
A. Adjustable SUB-BASE SB–89 or other unit support must be provided for panel wall type construction  
and for walls less than 8” thick.  
B. A minimum distance of 1” must be allowed on all sides of the unit to adjacent wall and floor. Where the  
sub–base is required, the minimum distance from the floor to the sleeve must be 3 1/2”. To minimize  
chances of short cycling of the compressor, the minimum clearance between the ceiling and the top of  
the unit should be 24”. (See Figure 1).  
FIGURE 1  
MINIMUM OF 24” REQUIRED  
FROM TOP OF UNIT TO CEILING.  
INSIDE  
WALL  
LINTELS  
WSC SLEEVE  
MINIMUM OF 1”  
SPACING REQUIRED  
ON ALL SIDES OF  
THE UNIT.  
DRAIN  
1” MINIMUM  
EXTENSION  
3 1/2” FOR  
SUBBASE  
9/16” MINIMUM  
OUTSIDE WALL  
46  
INSTALLATION REQUIREMENTS:  
STEP 1 The “WSC” SLEEVE should be positioned so that the DRAIN EXTENSION extends a minimum of 9/16” beyond the  
OUTSIDE WALL (See Figure 1).  
STEP 2 The “WSC” SLEEVE must extend a minimum of 7/8” beyond the INSIDE WALL.  
STEP 3 The “WSC” SLEEVE must be installed level side to side.  
STEP 4 The “WSC” SLEEVE must also be installed with a downward tilt toward the outside of the building. If a level is placed  
so that it rests on the FRONT and BACK UNIT REST as shown in Figure 2, a properly installed unit provides a 1/2  
bubble slope to the outside of the building.  
CAUTION: SLEEVE projections and leveling precautions must be observed to prevent the entry of water into the room.  
FIGURE 2  
RAISED LEDGE  
BACK UNIT REST  
LEVEL  
FRONT UNIT REST  
WARNING  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
SLEEVE INSTALLATION:  
STEP 1  
After unpacking the “WSC” SLEEVE from the carton, remove the corrugated FRONT PANEL.  
For immediate installation of sleeve and chassis (skip if installing chassis into sleeve at a later date):  
Remove the rear WEATHER PANEL. Reverse grille and place lower edge into sleeve tab (Friedrich logo facing  
out). Align slots with screw holes. Secure grille with screws.  
Place “WSC” SLEEVE in the wall opening following the instructions given in the INSTALLATION REQUIRE-  
MENTS section. Attach the SLEEVE to the INSIDE WALL by driving two #12A x 2” screws in each side of the  
SLEEVE (see Figure 1.). Shim at the top of the SLEEVE, midway between the sides. Drive one #12A x 2” screw  
in the top of the sleeve, close to the shim. Install screws from inside the SLEEVE. If the wall opening is not  
framed with wood, use expansion anchor bolts or molly (toggle) bolts (not provided).  
STEP 2  
Once the SLEEVE has been installed, check the LEVEL again to be sure the 1/2 bubble downward tilt is main-  
tained. Apply shims, if required, to maintain the proper slope.  
STEP 3  
STEP 4  
Caulk the perimeter of the entire opening on the inside and the outside between the SLEEVE and the WALL.  
The corrugated front panel removed in Step 1 above must be remounted back in place if masonry work is to be  
done and/or if the “WSC” CHASSIS is to be installed at a later date.  
47  
WARNING  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
48  
SEALING GASKET INSTALLATION INSTRUCTIONS  
WARNING  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
Remove the black rubber gasket from the air discharge plenum of the air conditioner (see fig. A). Look inside the wall sleeve and  
check to see if a black rubber gasket is already in place along the bottom front (see fig. B). If one is not in place, thoroughly clean  
the sleeve area between the front unit rests and the raised ledge (see fig. B). Once this area is clean and completely dry, peel the  
orange backing from the gasket and apply it to the base of the sleeve (see fig. B). Once the gasket has been properly applied, the  
sleeve is ready for the air conditioner to be installed per the installation instructons.  
FIGURE A  
AIR DISCHARGE PLENUM  
FIGURE B  
SIDE PROFILE  
RAISED LEDGE  
OF WALL SLEEVE  
GASKET  
FRONT UNIT REST  
49  
INSTALLATION INSTRUCTIONS  
FOR INTERNAL DRAIN KIT  
(IDK)  
Apply Sealer to  
the bottom of  
the Drain Plate  
Wall Sleeve  
Drill a .625”  
diameter  
hole here  
0.5” In  
from edge  
Sleeve  
Base  
4.75” From  
back of  
basepan  
Drill a .625”  
diameter  
hole in the  
bottom of  
Dimple  
the basepan  
WARNING  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
1.  
2.  
3.  
4.  
DRILL A .625” DIAMETER HOLE IN THE BOTTOM OF THE SLEEVE BASE TO THE  
DIMENSIONS SHOWN.  
APPLY A SILICONE TYPE OF SEALER TO THE OUTSIDE BOTTOM EDGES OF THE  
DRAIN PLATE.  
INSERT THE DRAIN TUBE INTO THE HOLE AND PRESS THE DRAIN PLATE DOWN TO  
FORM A WATERTIGHT SEAL AGAINST THE SLEEVE BASE.  
DRILLA .625” DIAMETER HOLE IN THE BOTTOM OF THE BASE PAN AS SHOWN IN THE  
ILLUSTRATION. THIS HOLE ALLOWS CONDENSATE TO ENTER THE WALL SLEEVE  
WHERE IT TRAVELS TO THE DRAIN KIT FOR DISPOSAL.  
50  
WARNING  
WARNING  
CUT/SEVER HAZARD  
EXCESSIVE WEIGHT HAZARD  
Use two people to lift or carry the unit,  
and wear proper protective clothing.  
Failure to do so may result in serious  
personal injury.  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
51  
WARNING  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
52  
WARNING  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
53  
WARNING  
CUT/SEVER HAZARD  
Be careful with the sharp edges and corners.  
Wear protective clothing and gloves, etc.  
Failure to do so could result in serious injury.  
54  
Friedrich Air Conditioning Company  
P.O. Box 1540  
San Antonio, TX 78295  
210.357.4400  
www.friedrich.com  
WALLMASTER®  
THRU-THE-WALL AIR CONDITIONERS  
LIMITED WARRANTY  
FIRST YEAR  
ANY PART: If any part supplied by FRIEDRICH fails because of a defect in workmanship or material within twelve months from  
date of original purchase, FRIEDRICH will repair the product at no charge, provided room air conditioner is reasonably accessible  
for service. Any additional labor cost for removing inaccessible units and/or charges for mileage related to travel by a Service  
Agency that exceeds 25 miles one way will be the responsibility of the owner. This remedy is expressly agreed to be the exclusive  
remedy within twelve months from the date of the original purchase.  
SECOND THROUGH FIFTH YEAR  
SEALED REFRIGERANT SYSTEM: If the Sealed Refrigeration System (defined for this purpose as the compressor, condenser  
coil, evaporator coil, reversing valve, check valve, capillary, filter drier, and all interconnecting tubing) supplied by FRIEDRICH in  
your Room Air Conditioner fails because of a defect in workmanship or material within sixty months from date of purchase,  
FRIEDRICH will pay a labor allowance and parts necessary to repair the Sealed Refrigeration System; PROVIDED FRIEDRICH will  
not pay the cost of diagnosis of the problem, removal, freight charges, and transportation of the air conditioner to and from the  
Service Agency, and the reinstallation charges associated with repair of the Sealed Refrigeration System. All such cost will be the  
sole responsibility of the owner. This remedy is expressly agreed to be the exclusive remedy within sixty months from the date of the  
original purchase.  
APPLICABILITY AND LIMITATIONS: This warranty is applicable only to units retained within the Fifty States of the U.S.A., District  
of Columbia, and Canada. This warranty is not applicable to:  
1. Air filters or fuses.  
2. Products on which the model and serial numbers have been removed.  
3. Products which have defects or damage which results from improper installation, wiring, electrical current  
characteristics, or maintenance; or caused by accident, misuse or abuse, fire, flood, alterations and/or misapplication  
of the product and/or units installed in a corrosive atmosphere, default or delay in performance caused by war,  
government restrictions or restraints, strikes, material shortages beyond the control of FRIEDRICH, or acts of God.  
OBTAINING WARRANTY PERFORMANCE: Service will be provided by the FRIEDRICH Authorized Dealer or Service  
Organization in your area. They are listed in the Yellow Pages. If assistance is required in obtaining warranty performance, write  
to: Room Air Conditioner Service Manager, Friedrich Air Conditioning Co., P.O. Box 1540, San Antonio, TX 78295-1540.  
LIMITATIONS:  
THIS WARRANTY IS GIVEN IN LIEU OF ALL OTHER WARRANTIES. Anything in the warranty  
notwithstanding, ANY IMPLIED WARRANTIES OF FITNESS FOR PARTICULAR PURPOSE AND/OR MERCHANTABILITY  
SHALL BE LIMITED TO THE DURATION OF THIS EXPRESS WARRANTY. MANUFACTURER EXPRESSLY DISCLAIMS AND  
EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGE FOR BREACH OF ANY EXPRESSED OR  
IMPLIED WARRANTY.  
Performance of Friedrich’s Warranty obligation is limited to one of the following methods:  
1. Repair of the unit  
2. A refund to the customer for the prorated value of the unit based upon the remaining warranty period of the unit.  
3. Providing a replacement unit of equal value  
The method of fulfillment of the warranty obligation is at the sole discretion of Friedrich Air Conditioning.  
NOTE: Some states do not allow limitations on how long an implied warranty lasts, or do not allow the limitation or exclusion of  
consequential or incidental damages, so the foregoing exclusions and limitations may not apply to you.  
OTHER: This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.  
PROOF OF PURCHASE: Owner must provide proof of purchase in order to receive any warranty related services.  
All service calls for explaining the operation of this product will be the sole responsibility of the consumer.  
All warranty service must be provided by an Authorized FRIEDRICH Service Agency, unless authorized by FRIEDRICH prior to  
repairs being made.  
(10-08)  
55  
TECHNICAL SUPPORT  
CONTACT INFORMATION  
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) 357-4490  
www.friedrich.com  
Printed in the U.S.A.  
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) 357-4490  
www.friedrich.com  
WM-ServMan (04-09)  
Printed in the U.S.A.  

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