Friedrich Metal Products WE10C33A Service Manual
2010
Thru-the-wall
Air Conditioners and Heat Pumps
Service Manual
r
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WallMaster® R-410A Models
Temperature
Cooler
Cool
Power
Fan
Fan
Only Speed Saver
Timer Operation
Start
Stop
Warmer
Heat
Money
®
Set Hr.
Cool Only
115-Volt: WS08C10A, WS10C10A, WS12C10A
230-Volt: WS10C30A, WS13C30A, WS15C30A
Cool with Electric Heat
115-Volt: WE10C33A, WE13C33A, WE15C33A
Heat Pump with Electric Heat Back Up
230-Volt: WY09C33A, WY12C33A
WM-ServMan (4-10)
Table Of Contents
Important Safety Information ....................................................................................................................2-4
Introduction ..................................................................................................................................................4
WallMaster Model Number Code and Serial Number Identication ............................................................5
Performance Data / Sleeve and Chassis Dimensions .................................................................................6
Electrical Data ..............................................................................................................................................7
How to Operate the Electronic WallMaster Room Air Conditioner ...........................................................8-9
Remote Control .........................................................................................................................................10
Electronic Control: Testing, Error Codes, Rebooting ...........................................................................11-12
Electronic Control Heat Pump Operation ...................................................................................................13
Coil Sensors ...............................................................................................................................................13
Components Testing .............................................................................................................................13-14
Refrigeration System Sequence of Operation ...........................................................................................15
R-410A Sealed System Repair Considerations .........................................................................................16
Sealed System Refrigeration Repairs / Charging .................................................................................17-20
Hermetic Components Check ....................................................................................................................21
Reversing Valve Description/Operation .....................................................................................................22
Testing the Coil and Reversing Valve ...................................................................................................23-24
Compressor Checks .............................................................................................................................25-26
Compressor Replacement ....................................................................................................................27-28
Routine Maintenance ............................................................................................................................29-30
Performance Test Data Sheet ....................................................................................................................31
Troubleshooting ....................................................................................................................................32-41
Wiring Diagrams ...................................................................................................................................42-44
Installation Accessories .............................................................................................................................45
Installation Instructions for “WSD” Sleeve ............................................................................................46-47
Installation Instructions for Bafe 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
Technical Assistance ..................................................................................................................................56
1
IMPORTANT SAFETY INFORMATION
The information contained in this manual is intended for use by a qualied 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 unqualied persons can result in subjecting the unqualied 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.
We have provided many important safety messages in this manual and on your appliance. Always read
and obey all safety messages.
WARNING
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.
NOTICE
Your safety and the safety of others are very important.
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.
You can receive minor or moderate injury if you do not follow instructions.
A message to alert you of potential property damage will have the
word “NOTICE”. Potential property damage can occur if instructions
are not followed.
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 qualied 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 specied 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 ame or hot •
surfaces can cause serious burns.
Make sure to protect personal and surrounding property with re proof materials.•
Have a re extinguisher at hand while using a torch.•
Provide adequate ventilation to vent off toxic fumes, and work with a qualied assistant whenever •
possible.
Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for •
leaks, ushing 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 ns 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
Return
Air Grille
Decorative
Front
WSD
Sleeve
6
543
21
BA
76
5
3
C
SW
#
L
E
D
O
M
B01A70
Airflow
Rotate
Discharge
Grille
1" Diameter Plug
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 specied 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 re 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 sufcient 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 operation and 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 Identication.)
4
FRIEDRICH WALLMASTER MODEL NUMBER CODE
D
W S 08 C 1 0 A
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 Specications/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
3 = 3 KW Heat Strip, Nominal
8th DIGIT
Major Change
WallMaster Serial Number Identification Guide
SERIAL NUMBER
YEAR MANUFACTURE
AK = 2010
AA = 2011
AB = 2012
AC = 2013
AD = 2014
MONTH MANUFACTURED
A = JanD = Apr G = JulK = Oct
B = FebE = May H = AugL = Nov
C = MarF = Jun J = SepM = Dec
AE = 2015
AF = 2016
AG = 2017
AH = 2018
AJ = 2019
AKAX00001
PRODUCTION RUN NUMBER
PRODUCT LINE
X = WallMaster
5
2010 PERFORMANCE DATA
Specifications
WallMaster Heat Pump heating information (shown in red) indicates heat pump heating performance. WallMaster Electric Heat heating information (shown in red)
indicates electric heat strip per formance. For WallMaster Heat Pump electric heating perfor mance refer to c orresponding WallMaster Electric Heat model.
Estar
Model
Cooling
Capacity Btu
Heating
Capacity Btu
Volts
Rated
Cooling
Amps Cooling Watts
Heating
Amps
Heating
Watts
Energy
Efciecy Ratio
EER
Moisture
Removal
Pints/HR
Room
Side Air
Circulation
CFM Sleeve
Net Weight
Lbs
WALLMASTER
Cool only
WS08C10A 7800 NA 115 7.1 788 NA NA 9.9 1.2 250 WSD 93
WS10C10A 9700 NA 115 10.0 1032 NA NA 9.4 2.4 257 WSD 103
WS12C10A 11900 NA 115 11.8 1266 NA NA 9.4 3.3 295 WSD 112
WS10C30A 9500/9200 NA 230/208 4.5/4.7 989/958 NA NA 9.6/9.6 1.5 300 WSD 101
WS13C30A 12600/12300 NA 230/208 6.3/6.7 1340/1309 NA NA 9.4/9.4 3.6 290 WSD 109
WS15C30A 14500/14500 NA 230/208 8.3/8.2 1706/1706 NA NA 8.5/8.5 4.2 290 WSD 119
Heat Pumps
WY09C33A 9300/9000 7300/7300 230/208 4.4/4.7 989/957 3.8/4.0 839/793 9.4/9.4 2.1 250 WSD 103
WY12C33A 12000/11800 9350/9200 230/208 6.1/6.4 1395/1372 4.8/5.1 1062/1010 8.6/8.6 2.6 275 WSD 111
Cool with Electric Heat
WE10C33A 9500/9200 11000/9100 230/208 4.5/4.7 989/958 16.0/14.7 3550/2950 9.6/9.6 1.5 300 WSD 121
WE13C33A 12600/12300 11000/9100 230/208 6.3/6.7 1340/1309 16.0/14.7 3550/2950 9.4/9.4 3.6 290 WSD 107
WE15C33A 14500/14500 11000/9100 230/208 8.3/8.8 1706/1706 16.0/14.7 3550/2950 8.5/8.5 4.2 290 WSD 116
DEFROST CONTROL: Initiated at 30°F (outdoor coil temperature for two
consecutive minutes) and terminated at 43°F (outdoor coil temperature). During
defrost, the compressor stops and the electric heat starts, then operates wit
h
the fan to maintain indoor comfort. The unit remains in electric heat mode.
DEFROST DR AIN: Drain automatically opens at approximately 50°F to prevent
condensate from freezing inside drain pan.
Note: all models will produce condensate. If condensate disposal is desired, an
optional drain kit is available.
As an partner, Friedrich Air Conditioning Co. has determined that the selected
(
) meet the guidelines for energy efficiency.
All models use
environmentally
friendly R-410A
refrigerant.
R-410A
WS08C10A 57 23 55 60 129 167 65 98 11 31 154 462 7.1 32.0 32.5 257 1085 15
WS10C10A 53 27 53 53 134 177 63 98 10 36 145 500 10.0 40.0 37.0 260 1080 15
WS12C10A 54 26 52 55 128 169 60 106 11 28 145 500 11.8 57.0 45.0 300 1380 15
WS10C30A 55 25 55 60 123 165 66 100 14 28 155 440 4.5 18.5 39.0 300 1400 15
WS13C30A 51 29 51 51 134 179 59 100 8 40 138 535 6.3 26.0 40.0 280 1300 15
WS15C30A 45 35 45 46 135 181 54 101 9 40 130 545 8.3 41.0 49.0 250 1345 15
WY09C33A 54 26 54 54 123 164 65 101 12 22 150 450 4.4 3.8 20.0 40.5 251 1335 20
WY12C33A 51 29 51 51 127 147 58 101 12 26 145 475 6.1 4.8 33.0 265 1330 20
WE10C33A 56 24 56 56 128 150 58 110 4 24 153 477 4.5 16.0 18.5 39.0 260 1455 20
WE13C33A 46 34 46 46 128 174 55 99 9 34 135 500 6.3 16.0 26.0 40.0 240 1350 20
WE15C33A 45 35 45 46 135 181 54 101 9 40 130 545 8.3 16.0 41.0 43.0 250 1345 20
*Rating Conditions: 80 degrees F, room air temp. & 50% relative humidity, with 95 degree F, outside air temp & 40% relative humidity, all systems use R410A
Dischar
ge
Temp
Suction
Temp
Liquid
Temp
Super
Heat
Evap
CFM
Motor
RPM
Locked
Rotor Amps
Charge in
OZ.
BREAKER
FUSE
60 Hertz
Amps
Sub-
Coolin
g
OPERATING
PRESSURES
ELECTRICAL RATINGS
R410A
Suction
Dischar
ge
Amps
Cool
Amps
Heat
WALLMASTER
EVAPORATOR AIR TEMP.
DEG. F
EVAPORATOR TEMP.
DEG. F
CONDENSER
TEMPERATU
DEG. F
RE
Discharge Air
Temp. Drop
F.
T(in)
T(out)
COOLING
PERFORMANCE
DATA*
Sleeve / Chassis Dimensions
Sleeve Dimensions
27" Sleeve
Friedrich WSC
Fedders A
Sleeve
Height (inches) 16 3/4 16 3/4 16 3/4
Width (inches)272727
Depth (inches) 16 3/4 16 3/4 16 3/4
Model
WALLMASTER
WSD Sleeve 16 3/427 16 3/4237 1/2 9/16 17 1/4 27 1/415 5/16
Chassis 15 3/4 26 1/22122-----
6
Height WidthDepth
Sleeve
Fedders B Sleeve*
Depth
with
Front
Minimum
Extension
Into Room
Minimum
Extension
Outside
Height
TTW Finished Hole
WidthMax. Depth
ELECTRICAL DATA
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
All electrical connections and wiring MUST be
installed by a qualied electrician and conform to
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 re 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 Unit MUST be grounded from branch circuit through service cord to unit, or through separate
ground wire provided on permanently connected units. Be sure that branch circuit or general
purpose outlet is grounded.
Receptacle The eld 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
Model Numbers
WS08C10A, WS10C10A,
WS12C10A
WS10C30A, WS13C30A,
WS15C30A
WE10C33A, WE13C33A,
WE15C33A, WY09C33A,
WY12C33A
Circuit Rating
Breaker or T-D Fuse
125V - 15A 5 - 15P
250V - 15A 6 - 15P
250V - 20A 6 - 20P
Plug Face
(NEMA#)
Wall Outlet
Appearance
The consumer - through the AHAM Room Air Conditioner Certication Program - can
be certain that the AHAM Certication Seal accurately states the unit’s cooling and
heating capacity rating, the amperes and the energy efciency ratio.
*HACR: Heating Air Conditioning and Refrigeration
7
ELECTRONIC CONTROL OPERATION
Temp/Hour
Cool
Money Saver
®
Fan Only
Clock
Start Time
Stop Time
Power
Fan
Speed
Mode
PM
Timer
On/Off
Set
Hour
Figure 1: WS Model cool-only control panel
Temp/Hour
Power
PM
Cool
Fan Only
Heat
Clock
Start Time
Stop Time
Smart
Fan
Fan
Speed
Mode
Timer
On/Off
Money
Saver
Set
Hour
2 3
4
1
6
5
7
9
8
10 11 12
14
13
Figure 2: WY/WE Model heat-cool control panel
Figure 1: WS Model cool-only control panel Figure 2: WY/WE Model heat-cool control panel
To start unit
If the 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.
Touch the Power button once. The unit will automatically be in
1
Cool mode with the temperature set at 75°F (24°C) and the fan
speed at F1, the sleep setting.
To set mode of operation
When you rst turn the unit on, it will be in the Cool mode with constant
fan.
2
On WS cool-only models, touch the Mode button once to activate
the MoneySaver® (See item 14 for MoneySaver instructions on
WY/WE models).
MoneySaver® is a feature that cycles the fan with the compressor
so that the fan does not run all the time. This saves energy and
improves dehumidication. 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).
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 Only feature. The Fan Only setting will circulate
air in the room without the compressor coming on.
Continuing from MoneySaver® mode, touch the Mode button
3
once to activate the Fan Only feature (WS cool-only models).
To adjust temperature
Use the Mode button to select either the Cool or MoneySaver®
4
function (or Heat for WY/WE heat-cool models)
COOLER – Touch the button to lower the room air
5
temperature.
8
6
WARMER – Touch the
7
Press both the
button to raise the room air temperature.
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.
To adjust fan speed
8
Touch the Fan Speed button to see the current setting. Touch
it again t o change s peed. F1 i s the lowest setting (SLEEP
SETTING / LOW), F2 is MEDIUM, and F3 is HIGH.
To activate Smart Fan (WS cool-only models)
9
There is a fourth option, SF, when selecting the fan speed. This is
the SMART FAN function. SMART FAN DOES NOT OPERAT E
IN CONJUNCTION WITH THE FAN ONLY MODE.
To activate Smart Fan (WY/WE heat-cool models)
9
Press the Smart 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.
To set the hour clock
10
Touch t he Set Hour b utton to see t he current setting. T he
Use the
and buttons to change the settings. BE SURE
TO SET A.M. AND P. M. ACCORDINGLY. (P. M. is indicated by
a red light in the upper left corner of the display).
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To set the timer
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.
11
After setting the time, press the Set Hour button once (Start
light on). Use the
unit will START.
12
After selecting the Start Time, press the Set Hour button once.
(Stop Light on). Use the
that the unit will STOP. After selecting the stopping time, press
and
and
buttons to select the time
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 the Timer 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.
NOTE: If the unit is unplugged or the power is interrupted, the HOUR
must be reset or the Timer On/Off will not function when desired.
To Activate Money Saver (WY/WE models)
eht taht emit eht tceles ot snottub
14
Press the Money Saver button to activate the Money Saver
feature. The light will indicate the Money Saver is in use.
®
MoneySaver
is a feature that cycles the fan with the com pres
sor so that the fan does not run all the time. This saves energy
i fidim uh ed sevorpmi dnarevaSyenoM .noit ac
®
will also run to test
the temperature if the off cycle is too long. Or you may prefer
touch the Mode button two more times).
CHECKING ROOM TEMPERATURE
1. Check the room temperature at the electronic control
pad by pressing at the same time, the Fan Speed
button and the Temp/Hour button (see gures 1
and 2).
2. The indoor temperature will display for 10 seconds.
Indoor temperature can be viewed in all modes, including
the Test Mode. The display can be changed back to
the SET temperature by pressing any key (except the
Power (on/off button) or it can do so automatically after
10 seconds have elapsed.
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9
Using the remote control
WY/WE heat- cool model remote control
Figure 3
Money
Fa n
Timer Opera tion
Set H r.
Stop
Star t
Temperat ure
Fa n
Cool
On/Of f
Power
Coole r
Warmer
Only S peed Sa ver
®
Heat
To start unit
1
POWER - Press the Power button once. The unit will 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.
3
FAN ONLY - Press the Fan Only button if you want to run the
fan only.
4
HEAT (WY/WE m odels only) - P ress t he Heat button to
automatically switch the operating mode to HEAT.
®
5
MoneySaver
the MoneySaver
- Press the Money Saver
®
feature. This feature cycles the fan with t he
compressor so that the fan does not run all the time.
To adjust temperature
6
WARMER - Press the
7
COOLER - Press the
To adjust fan speed
8
FAN SPEED - Press the Fan Speed button to see the current
Warmer button to raise the temperature sett
Cooler button to lower the temperature se
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.
®
button to activate
To set the hour clock
9
SET HOUR CLOCK - Press the Set Hr. button once to see the
current clock setting. Continue pressing the button u ntil y ou
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.
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.
10
TIMER START - Press Start to view the current start time for cool-
ing. Continue pressing the START button until you arrive at the start
time you desire. The start time for cooling will then be set.
11
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.
12
TIMER ON / OFF - P ress the O n/Off b utton (under Timer
ing.
tt
ing.
Operation .remit eht )ffo thgil( etavitcaed ro )no thgil( etavitca ot )
Once the on and off times have been selected, they will remain
in memory and cycle daily until changed.
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.
10
ELECTRONIC CONTROL PANEL
Temp/Hour
Cool
Money Saver
®
Fan Only
Clock
Start Time
Stop Time
Power
Fan
Speed
Mode
PM
Timer
On/Off
Set
Hour
Temp/Hour
Power
PM
Cool
Fan Only
Heat
Clock
Start Time
Stop Time
Smart
Fan
Fan
Speed
Mode
Timer
On/Off
Money
Saver
Set
Hour
2 3
4
1
6
5
7
9
8
10 11 12
14
13
Figure 4: “WS” Cooling only models
Electronic Control Panel
TESTING THE ELECTRONIC CONTROL
ACTIVATING TEST MODE
Activate Test Mode by pre ssi ng at the same time, t he Mode
button and the Temp/Hour button (see gures 4 and 5).
The LEDs for Set/Hour: “Start T ime” and “Stop Time” will
blink 1 bps while Test Mode is active.
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.
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 Lockout, all delays for fan motor start, speed change, and when
switching modes.
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.
Activating Error Code Mode: Press the TIMER On/Off”
button (see gures 4 and 5). The LED for the TIMER On/
Off will ash 1 bps (beats per second) while Error Code
Mode is active. Pressing the Temp/Hour button will
display “00”. Consecutive presses will scroll through all
error codes stored. Press the Temp/Hour button to
see the 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)
Figure 5: “WE”/”WY” heat/cool models
Electronic Control Panel
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.
MEMORY
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.
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 from Cool mode to Fan Only mode, and
switch back to Cool mode, there is a three-minute delay before the
compressor comes back on.
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ERROR CODES LISTING FOR “WS” MODELS
E1 SHORT CYCLE SITUATION: Dened as a
compressor that starts and stops more frequently
than it should (more than 6 times per hour).
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” key is stuck,
the unit’s function will default to Cool mode.
E3 FROST PROBE OPEN: Normal operation is
allowed. Replace probe.
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. Replace probe.
E6 INDOOR PROBE SHORT: Control assumes
ambient temperature is 90 degrees F and unit
will operate. Replace probe.
(See note and other infomation below)
ERROR CODES LISTING FOR “WE/WY” MODELS
E1 SHORT CYCLE SITUATION: Dened as a
compressor that starts and stops more frequently
than it should (more than 6 times per hour).
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” key is stuck,
the unit’s function will default to Cool mode.
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).
E4 EVAPORATOR TEMPERATURE PROBE
OPEN O R SHORT: Normal operation is allowed.
Replace probe (see note below).
E5 CONDENSER TEMPERATURE PROBE
OPEN O R SHORT: Normal operation is allowed.
Replace probe.
E7 MOTOR OPERATION
E9 HEAT PUMP FAILURE
NOTE: All error codes display for probes open or shorted will
allow unit to operate. Unit may ice up if faulty components
are not replaced.
Indoor Coil Frost Probe Sensor:
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.
Indoor Air Probe Sensor:
Control range is 60 degrees F to 90 degrees F +/- 3
degrees F.
REBOOT THE CONTROL PANEL
Reboot the control panel as follows: With the unit on,
simultaneously hold down the Mode button and 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 nish the reboot cycle.
If the panel does not reboot, you will most likely need to
replace the electronic control.
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ELECTRONIC CONTROL
FAN MOTOR - TEST
1. Make sure the motor has cooled down.
2. Disconnect the fan motor wires from the control board.
3. Test for continuity between the windings also, test to
ground.
4. If any winding is open or grounded replace the motor.
Fan Motor
FAN MOTOR
A single phase permanent split capacitor motor is used to drive
the evaporator blower and condenser fan. A self-resetting
overload is located inside the motor to protect against high
temperature and high amperage conditions. (See Figure 23)
ELECTRIC SHOCK HAZARD
WARNING
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
OPERATION
Heat Pump Models
If the indoor ambient air themister reads 55 degrees or
lower, the control will turn off the compressor and turn
on the electric heat and continue fan operation until temp
setting is satised. Then revert to standard heat pump
operation.
If the compressor is time delayed, the control will:
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.
Defrost:
If the outdoor coil thermister reads 30 degrees or lower
for 2 minutes continuously, the control will turn off the
compressor and turn on the electric heat and continue fan
operation.
If the outdoor coil thermister reaches 43 degrees and
the compressor has waited the standard delay time of
180-240 seconds, the control will:
1. Turn off the backup electric heat
2. Wait 5 seconds
3. Turn on the compressor
4. Continue fan operation.
COMPONENTS TESTING
WARNING
ELECTRIC SHOCK HAZARD
Disconnect power to the unit before
servicing. Failure to follow this warning
could result in serious injury or death.
COIL SENSORS
Positioning of the Coil Sensors (Thermisters) is critical to
proper operation of the Electronic Control.
Ensure that sensors are positioned as indicated in the
illustrations below.
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Heating Element
HEATING ELEMENT
(“WE” &”WY” 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
Primary limit located near the bottom, will open the
circuit when the temperature reaches 130°F +/-5°. The
Secondary 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.
Not actual element - for reference only
COMPONENTS TESTING (Continued)
CAPACITORS
WARNING
ELECTRIC SHOCK HAZARD
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.
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.
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 identied terminal is
connected to the “S” or start terminal. The identied
terminal should always be connected to the supply line, or
“R” terminal, never to the “S” terminal.
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.
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 assists in cooling the refrigerant plus evaporating the water.
During the heating mode of operation, it is necessary that
water be removed to prevent it from freezing during cold
outside temperatures. This could cause the condenser
fan blade to freeze in the accumulated water and prevent
it from turning.
To provide a means of draining this water, a bellows type
drain valve is installed over a drain opening in the base
pan. This valve is temperature sensitive and will open
when the outside temperature reaches 40°F. The valve
will close gradually as the temperature rises above 40°F
to fully close at 60°F.
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Drain Pan Valve
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 difcult and time
consuming, if not (in some cases) entirely impossible. The
refrigeration system uses four basic principles (laws) in its
operation they are as follows:
1. “Heat always ows from a warmer body to a cooler
body.”
2. “Heat must be added to or removed from a substance
before a change in state can occur”
3. “Flow is always from a higher pressure area to a lower
pressure area.”
4. “The temperature at which a liquid or gas changes state
is dependent upon the pressure.”
The refrigeration cycle begins at the compressor. Starting
the compressor creates a low pressure in the suction line
which draws refrigerant gas (vapor) into the compressor.
The compressor then “compresses” this refrigerant, raising
its pressure and its (heat intensity) temperature.
The refrigerant leaves the compressor through the discharge
Line as a hot High pressure gas (vapor). The refrigerant
enters the condenser coil where it gives up some of its
heat. The condenser fan moving air across the coil’s nned
surface facilitates the transfer of heat from the refrigerant to
the relatively cooler outdoor air.
When a sufcient 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 ow across the condenser 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 refrigerant leaves the condenser Coil through the liquid
line as a warm high pressure liquid. It next will pass through
the refrigerant drier (if so equipped). It is the function of the
drier to trap any moisture present in the system, contaminants,
and large particulate matter.
The liquid refrigerant next enters the metering device. The
metering device is a capillary tube. The purpose of the
metering device is to “meter” (i.e. control or measure) the
quantity of refrigerant entering the evaporator coil.
In the case of the capillary tube this is accomplished (by
design) through size (and length) of device, and the pressure
difference present across the device.
Since the evaporator coil is under a lower pressure (due to
the suction created by the compressor) than the liquid line,
the liquid refrigerant leaves the metering device entering the
evaporator coil. As it enters the evaporator coil, the larger
area and lower pressure allows the refrigerant to expand
and lower its temperature (heat intensity). This expansion is
often referred to as “boiling”. Since the unit’s blower is moving
indoor air across the nned surface of the evaporator coil,
the expanding refrigerant absorbs some of that heat. This
results in a lowering of the indoor air temperature, hence the
“cooling” effect.
The expansion and absorbing of heat cause the liquid
refrigerant to evaporate (i.e. change to a gas). Once the
refrigerant has been evaporated (changed to a gas), it is
heated even further by the air that continues to ow across
the evaporator coil.
The particular system design determines at exactly what
point (in the evaporator) the change of state (i.e. liquid to a
gas) takes place. In all cases, however, the refrigerant must
be totally evaporated (changed) to a gas before leaving the
evaporator coil.
The low pressure (suction) created by the compressor
causes the refrigerant to leave the evaporator through the
suction line as a cool low pressure vapor. The refrigerant then
returns to the compressor, where the cycle is repeated.
Suction
Line
Evaporator
Coil
Metering
Device
Refrigerant
Strainer
Discharge
Line
Condenser
Coil
Compressor
Refrigerant Drier
Liquid
Line
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R-410A SEALED SYSTEM REPAIR CONSIDERATIONS
WARNING
Refrigeration system under high pressure
Do not puncture, heat, expose to ame or incinerate.
Only certied refrigeration technicians should
service this equipment.
R410A systems operate at higher pressures than
R22 equipment. Appropriate safe service and
handling practicces must be used.
Only use gauge sets designed for use with R410A.
Do not use standard R22 gauge sets.
The following is a list of important considerations when working with R-410A equipment
• R-410A pressure is approximately 60% higher than R-22 pressure.
• R-410A cylinders must not be allowed to exceed 125 F, they may leak or rupture.
• R-410A must never be pressurized with a mixture of air, it may become
ammable.
• Servicing equipment and components must be specically designed for use with R-410A and
dedicated to prevent contamination.
• Manifold sets must be equipped with gauges capable of reading 750 psig (high side) and 200
psig (low side), with a 500-psig low-side retard.
• Gauge hoses must have a minimum 750-psig service pressure rating
• Recovery cylinders must have a minimum service pressure rating of 400 psig, (DOT 4BA400
and DOT BW400 approved cylinders).
• POE (Polyol-Ester) lubricants must be used with R-410A equipment.
• To prevent moisture absorption and lubricant contamination, do not leave the refrigeration
system open to the atmosphere longer than 1 hour.
• Weigh-in the refrigerant charge into the high side of the system.
• Introduce liquid refrigerant charge into the high side of the system.
• For low side pressure charging of R-410A, use a charging adaptor.
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• Use Friedrich approved R-410A lter dryers only.
R-410A SEALED REFRIGERATION SYSTEM REPAIRS
IMPORTANT
SEALED SYSTEM REPAIRS TO COOL-ONLY MODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.
SEALED SYSTEM REPAIRS TO HEAT PUMP MODELS REQUIRE THE INSTALLATION OF A SUCTION LINE DRIER.
EQUIPMENT REQUIRED:
1. Voltmeter
2. Ammeter
3. Ohmmeter
9. High Pressure Gauge - (0 to 750 lbs.)
10. Low Pressure Gauge - (-30 to 200 lbs.)
11. Vacuum Gauge - (0 - 1000 microns)
4. E.P.A. Approved Refrigerant Recovery System
5. Vacuum Pump (capable of 200 microns or less
vacuum.)
6. Acetylene Welder
7. Electronic Halogen Leak Detector capable of
detecting HFC (Hydrouorocarbon) refrigerants.
8. Accurate refrigerant charge measuring device such
as:
a. Balance Scales - 1/2 oz. accuracy
b. Charging Board - 1/2 oz. accuracy
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.
WARNING
HIGH PRESSURE HAZARD
Sealed Refrigeration System contains refrigerant
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.
12. Facilities for owing nitrogen through refrigeration tubing
during all brazing processes.
EQUIPMENT MUST BE CAPABLE OF:
1. Recovering refrigerant to EPA required levels.
2. Evacuation from both the high side and low side of the
system simultaneously.
3. Introducing refrigerant charge into high side of the
system.
4. Accurately weighing the refrigerant charge introduced
into the system.
Proper refrigerant charge is essential to proper unit operation.
Operating a unit with an improper refrigerant charge will
result in reduced performance (capacity) and/or efciency.
Accordingly, the use of proper charging methods during
servicing will insure that the unit is functioning as designed
and that its compressor will not be damaged.
Too much refrigerant (overcharge) in the system is just as bad
(if not worse) than not enough refrigerant (undercharge). They
both can be the source of certain compressor failures if they
remain uncorrected for any period of time. Quite often, other
problems (such as low air ow across evaporator, etc.) are
misdiagnosed as refrigerant charge problems. The refrigerant
circuit diagnosis chart will assist you in properly diagnosing
these systems.
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 specic type of
failure will be inuenced by the amount of liquid being returned,
and the length of time the slugging continues.
Refrigerant Charging
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 vacuum system. Crimp process
tube line and solder end shut. Do not leave a service valve in
the sealed system.
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 sufcient 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.
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