Friedrich Wallmaster WCT08A10A User manual

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Service/ Manual
Thru - the Wall Air
Conditioners
Wallmaster Models
Cool Only WCT08A10A, WCT10A10A, WCT12A10A, WCT12A10B
WCT10A30A, WCT12A30A, WCT16A30A
WHT12A33A
115-Volt:
230-Volt:
Electric Heat
Heat Pump
230-Volt:
93001405_03
WET10A33A, WET12A33A, WET16A33A
230-Volt:

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Table of Contents
INTRODUCTION 3
Important Safety Information 3
Personal Injury Or Death Hazards 4
Personal Injury Or Death Hazards 5
New Wallmaster Control Options 6
Model and Serial Number Location 7
Model Number Reference Guide 8
Serial Number Reference Guide 9
SPECIFICATIONS 10
Refrigeration Systems Performance Data 10
Electrical Data 12
OPERATION 14
Airow Adjustment 14
User Interface 15
Control Panel 27
OPERATION 28
Remote Control 28
Unit 29
Unit Cooling Mode 30
General Knowledge Sequence Of Refrigeration 34
ROUTINE MAINTENANCE 35
Remove And Install The Front Cover and Filter 35
REMOVE AND INSTALL THE CHASSIS 37
TROUBLESHOOTING 38
Cooling Sizing Guide 38
Diagnostic Codes 39
Troubleshooting Tips 40
COMPONENT TESTING 48
Capillary Tube and Check Valve Assy (Heat Pump Units) 48
Capillary Tube Assy (Cool Only Units) 49
Reversing Valve Description And Operation 50
Testing The Reversing Valve Solenoid Coil 51
Checking The Reversing Valve 52
Touch Test Chart : To Service Reversing Valves 53
Compressor Checks 54
Fan Motor 56
Capacitors 56
Heating Element 57
Drain Pan Valve 57
Testing the User Interface and Electronic Control Board 58
Thermistors Description 58
Electronic Control Board Identication 59
Replace the Electronic Control Board 60
Replace the User Interface 60
R-410A SEALED SYSTEM REPAIR 61
Refrigerant Charging 62
Undercharged Refrigerant Systems 63
Overcharged Refrigerant Systems 64
Restricted Refrigerant System 65
Sealed System Method of Charging/ Repairs 66
Compressor Replacement 67
Compressor Replacement -Special Procedure in Case of Compressor Burnout 68
Replace The Reversing Valve 69
WIRING DIAGRAMS 70
INTERACTIVE PARTS VIEWER 73
Available Accessories 74
APPENDIX 75
Appendix 1-Thermistor Resistence Values (This Table Applies to All Thermistors) 75
FRIEDRICH AUTHORIZED PARTS DEPOTS 77

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Your safety and the safety of others is 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:
Indicates a hazard which, if not avoided, can result in severe personal injury or death
and damage to product or other property.
Indicates a hazard which, if not avoided, can result in personal injury and damage to
product or other property.
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.
Indicates property damage can occur if instructions are not followed.
WARNING
Refrigeration system
under high pressure
Do not puncture, heat, expose to ame or incinerate.
Only certied refrigeration technicians should service
this equipment.
R410A systems operate at higher pressures than R22
equipment. Appropriate safe service and handling
practices must be used.
Only use gauge sets designed for use with R410A.
Do not use standard R22 gauge sets.
NOTICE
CAUTION
WARNING
The information in this manual is intended for use by a qualied 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 unqualied persons can result in subjecting the unqualied 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.
Important Safety Information
INTRODUCTION

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SAFETY
FIRST
WARNING AVERTISSEMENT ADVERTENCIA
Do not remove, disable or
bypass this unit’s safety
devices. Doing so may cause
re, Doing so may cause re,
injuries, or death.
Ne pas supprime, désactiver ou
contourner cette l´unité des
dispositifs de sécurité, faire vous
risqueriez de provoquer le feu, les
blessures ou la mort.
No eliminar, desactivar o pasar
por alto los dispositivos de
seguridad de la unidad. Si lo hace
podría producirse fuego, lesiones
o muerte.
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 qualied 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.
• Do not spray water on the air conditioning unit while the power is on.
• 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.
• Use air conditioner on a single dedicated circuit within the specied amperage rating.
• Use on a properly grounded outlet only.
• Do not cut or modify the power supply cord or remove the ground prong of the plug.
• Never operate the unit on an extension cord.
• Follow all safety precautions and use proper and adequate protective safety aids such as: gloves, goggles,
clothing, properly insulated tools, and testing equipment etc.
• Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
INTRODUCTION
Personal Injury Or Death Hazards
WARNING
ALWAYS USE INDUSTRY STANDARD
PERSONAL PROTECTIVE EQUIPMENT
(PPE)

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• REFRIGERATION SYSTEM REPAIR HAZARDS:
• Use approved standard refrigerant recovering procedures and equipment to relieve high pressure before
opening system for repair. Reference EPA regulations (40 CFR Part 82, Subpart F ) Section 608.
• 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 certain to protect personal and surrounding property with re proof materials and have a re extinguisher
at hand while using a torch.
• Provide adequate ventilation to vent off toxic fumes, and work with a qualied assistant whenever possible.
• Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for leaks,
ushing etc.
• 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 the 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.
• PROPERTY DAMAGE HAZARDS
• FIRE DAMAGE HAZARDS:
• Read the Installation/Operation Manual for the air conditioning unit prior to operating.
• Use air conditioner on a single dedicated circuit within the specied 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.
• Be extremely careful when using acetylene torch and protect surrounding property.
• 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 can result in water damage to personal
items or property.
• Insure that the unit has a sufcient 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 damage to the unit and/or minor to serious property damage.
INTRODUCTION
Personal Injury Or Death Hazards

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INTRODUCTION
New Wallmaster Control Options
The new Wallmaster gives you a variety of options for control, programming, and scheduling including wireless capabilities.
Wireless Programming and Control:
Friedrich Connect allows you to conveniently control, program, and monitor your air conditioning unit remotely from a smartphone
or computer.
Pre-Programmed Timer Options:
Your unit’s digital control comes equipped with a 24-hour timer.
24-Hour Timer
The 24-hour timer allows you to set 2 temperature changes at pre-set times on the unit control panel.
Customizable Programming Options:
Customizable timers, with up to four temperature adjustments per day, can be set using Friedrich Connect for one or multiple units.
See www.friedrich.com for complete details on Friedrich Connect.
Figure 101 (New Wallmaster Options)

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INTRODUCTION
This service manual is designed to be used in conjunction with the installation and operation manuals provided
with each air conditioning system.
This service manual was written to assist the professional service technician to quickly and accurately diagnose
and repair malfunctions.
Installation procedures are not given in this manual. They are given in the Installation/Operation manual which can
be aquired on the Friedrich website.
Model and Serial Number Location
Figure 102 (Model and Serial Number Location)
Model and Serial Number Information

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INTRODUCTION
Model Number Reference Guide
MODEL TYPE
K - KUHL
W - WALLMASTER
FUNCTION
C - COOL ONLY
E - ELECTRIC HEAT
H - HEAT PUMP
APPLICATION
T - THRU THE WALL
APPROXIMATE COOLING
BTU / HR
ENGINEERING REVSION
LETTER INDICATES AN
ENGINEERING MODIFI-
CATION TO AN EXISTING
MODEL
MARKETING SUFFIX LETTER
INDICATES MODIFICATION TO
AN EXISTING MODEL
HEAT STRIP
0 - STRAIGHT COOL & HEAT
PUMP
3 -3.3 KW HEAT STRIP, NOMINAL
4 - 4.0 KW HEAT STRIP, NOMINAL
5 - 5.2 KW HEAT STRIP, NOMINAL
VOLTAGE
1 - 115 VOLTS
3 - 230 VOLTS
MODEL INTRODUCTORY
CHARACTER
A - 2019
B -
C -
D -
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.
Figure 103 (Model Number Reference Guide)
K C M 21 A 3 0 A - A

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INTRODUCTION
Serial Number Reference Guide
YEAR OF MANUFACTURE
17 = 2017 18 = 2018
19 = 2019 20 = 2020
21 = 2021 22 = 2022
MONTH OF MANUFACTURE
01 = JANUARY
02 = FEBRUARY
03 = MARCH
04 = APRIL
05 = MAY
06 = JUNE
07 = JULY
08 = AUGUST
09 = SEPTEMBER
10 = OCTOBER
11 = NOVEMBER
12 = DECEMBER
FACTORY DESIGNATION
M = FRIEDRICH MTY
NUMERIC SEQUENCE
FIRST UNIT OF EACH MONTH = 00001
Figure 104 (Serial Number Reference Guide)
17 12 M 00001

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SPECIFICATIONS
Refrigeration Systems Performance Data
Model
Condensor
Temp
Deg F.
Discharge
Temp
Deg. F
Suction
Temp
Deg F
Electrical Ratings R-410A REF. Breaker
AMPS
COOL AMPS HEAT
LOCKED
ROTOR
AMPS CHARGE IN OZ Voltage
60
HERTZ
AMPS
Cool Only
WCT08A10A 121 161 64 7 30.5 23.5 115 15
WCT10A10A 125 158 50 9.3 49 26.6 115 15
WCT10A30A 122 162 53 4.4 21 24 230 15
WCT12A10A 121 159 55 11.1 52 32.5 115 15
WCT12A10B 121 159 55 10.5 52 27.8 115 15
WCT12A30A 121 162 58 5.4 29 29.3 230 15
WCT16A30A 125 167 51 7.5 52 40 230 15
Cool+ (Heat Pump)
WET10A33A 122 162 53 4.4 16 21.5 24 230 20
WET12A33A 121 162 58 5.4 16 29 29.3 230 20
WET16A33A 125 167 51 7.5 16 33 40 230 20
Cool+ (Electric Heat)
WHT12A33A 123 166 63 5.5 4.5/16 29.5 38.3 230 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 R-410A. Test done at highest unit fan speed.
Figure 201 (Refrigeration Systems Performance Data)

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Model UPC
Cooling
Btu
Heating
Btu Volts
Cooling
Amps
Cooling
Watts
Heating
Amps
Heating
Watts EER CEER COP
Moisture
Removal-
Pints/HR CFM
Cooling Only
WCT08A10A 724587436655 8000 — 115 7.0 748 — — 10.7 10.6— 1.8 250
WCT10A10A724587436662 10000 — 115 9.3 935 — — 10.7 10.6 — 2.4 250
WCT12A10A 724587436952 12000 — 115 11.1 1250 — — 9.6 9.5 —3.8 295
WCT12A10B 724587436952 11600 — 115 10.5 11700 — — 9.6 9.5 —3.8 295
WCT10A30A 724587436945 10000 — 230 4.4 935 — — 10.7 10.6 —2.7 275
WCT12A30A 724587436969 12000 — 230 5.41250 — — 9.6 9.5 —3.8 300
WCT16A30A 724587436976 15400 — 230 7.5 1638 — — 9.4 9.3 — 4.8 290
Cooling with Heat Pump and Electric Heat
WHT12A33A 724587436983 11100 230 5.5 1181 1087 5.0 9.49.3 2.3 3.1 275
Cooling with Electric Heat
WET10A33A 724587436990 10000 11000 230 4.4935 3550 16.0 10.7 10.6 —2.7 260
WET12A33A 724587437003 12000 11000 230 5.4 1250 3550 16.0 9.6 9.5 —3.8 290
WET16A33A 724587437010 15400 11000 230 7.5 1638 3550 16.0 9.4 9.3 —4.8 290
SPECIFICATIONS
Figure 202 (Specications)
HEATING PERFORMANCE: Change-over from heat pump operation to resistance operation on models indicated is
automatic at a preset outside ambient temperature of approximately 35°F.
Calculate the heat loss of the space to be heated. As long as the heat loss does not exceed the resistance heating capacity
rating of the unit, the heating performance will be satisfactory.
Note: all models will produce condensate. If condensate disposal is desired, an optional drain kit is available.
DEFROST CONTROL: Initiated at 30°F (outdoor coil temperature) and terminated at 43°F (outdoor coil temperature).
During defrost, the compressor stops and the electric heat starts, then operates with the fan to maintain indoor comfort.
Below 43°F, the unit remains in electric heat mode.
DEFROST DRAIN: Drain automatically opens at approximately 40°F to prevent condensate from freezing inside drain pan.
Installation
Height Width Depth
Height
of Front
Width of
Front
Depth
with
Front
Minimum
Extension Into
Room with
Front
15 ¾" 26 ½" 21" 17 ¼" 27 ½" 23 ¼" 7½"
Height Width Depth
Depth
with
Front
Minimum
Extension
Outside
Thru-the-wall
Finished Hole
Height Width Max. Depth
16 ¾" 27" 16 ¾" 24 ¼"
9
/ 16 "17 ¼" 27¼" 15
5
/ 16 "
Installation Clearances
Improper installation of the Air Condtioner can cause poor performance and premature wear of the unit.
Ensure that the Wallmaster unit is installed with proper clearances as described below.
Ensure no obstructions. or enclosures are within clearances limits to allow for proper airow.
Clearances
Rear of Unit - Three (3) feet
Figure 203 (Chassis Dimensions) Figure 204 (WSE Sleeve Dimensions)

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SPECIFICATIONS
Electrical Data
WARNING
ELECTRIC SHOCK HAZARD
Turn off electric power before service or
installation.
All electrical connections and wiring MUST be
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
electically unsafe conditions which could cause moderate
or serious property damage.
Read, understand and follow the above warning.
Circuit Rating/ Breaker/ power cord/ wall Receptacle
Model
Circuit Rating
Breaker or
T-D Fuse
Plug Face
(NEMA#)
Power Cord
Length (ft.)
Required Wall
Receptacle
NEMA NO.
Wall Outlet
Appearance
WCT08A10A, WCT10A10A ,
WCT12A10A. 125V - 15A 5 - 15P 6 5-15R
WCT10A30A, WCT12A30A,
WCT16A30A. 250V - 15A 6 - 15P 6 6-15R
WHT12A33A, WET10A33A,
WET12A33A. WET16A33A. 250V - 20A 6 - 20P 6 6-20R
Wire Size - Use ONLY wiring size recommended by the National Electric Code (NEC) 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.
Figure 206 (Circuit Breaker / Plug / Receptacle / Cord Rating)

13 PB
WARNING
Electrical Shock Hazard
Make sure your electrical receptacle has the
same conguration as your air conditioner’s
plug. If different, consult a Licensed Electrician.
Do not use plug adapters.
Do not use an extension cord.
Do not remove ground prong.Always plug into
a grounded 3 prong outlet. Failure to follow
these instructions can result in death, re, or
electrical shock.
Make sure the wiring is adequate for your unit.
If you have fuses, they should be of the time delay type. Before you install or relocate this unit, be sure that the
amperage rating of the circuit breaker or time delay fuse does not exceed the amp rating listed in Table 206.
DO NOT use an extension cord.
The cord provided will carry the proper amount of electrical power to the unit; an extension cord may not.
Make sure that the receptacle is compatible with the air conditioner cord plug provided.
Proper grounding must be maintained at all times. Two prong receptacles must be
replaced with a grounded receptacle by a certied electrician.
The grounded receptacle should meet all national and local codes and ordinances. You must use the three prong plug
furnished with the air conditioner. Under no circumstances should you remove the ground prong from the plug.
Test the power cord.
All Friedrich room air conditioners are shipped from the factory with a Leakage Current
Detection Interrupter (LCDI) equipped power cord. The LCDI device on the end of the cord
meets the UL and NEC requirements for cord connected air conditioners.
To test your power supply cord:
1. Plug power supply cord into a grounded 3 prong outlet.
2. Press RESET (see Figure 207).
3. Press TEST, listen for click; the RESET button trips and pops out.
4. Press and release RESET (Listen for click; RESET button latches and remains in). The power cord is ready for use.
Once plugged in, the unit will operate normally without the need to reset the LCDI device. If the LCDI device fails to trip when
tested or if the power supply cord is damaged, it must be replaced with a new power supply cord from the manufacturer.
NOTICE
Do not use the LCDI device as an ON/OFF switch.
Failure to adhere to this precaution may cause
premature equipment malfunction.
WARNING:
TEST BEFORE EACH USE!
1. PRESS RESET BUTTON.
2. PLUG LCDI INTO POWER
RECEPTACLE.
3. PRESS TEST BUTTON,
RESET BUTTON SHOULD
POP UP.
4. PRESS RESET BUTTON
FOR USE.
DO NOT USE IF ABOVE
TEST FAILS.
RESET
TEST
Green LED
Indicator
Light
(Illuminated
when ready
for use)
SPECIFICATIONS
Electrical Data
Figure 207 (LCDI Power Cord)

14 PB
The airow path may be adjusted to distribute air independently from the left or right side of the discharge opening. Each of the
banks of louvers can be directed left, right, up, or down in order to achieve the most optimum airow positioning.
To adjust airow direction left or right, grab the lever in the center of the louver bank and move it in the direction that you would
like the air to be directed. To adjust the airow up or down, rotate the entire vent to the desired position Please note that it is
normal that airow may be stronger out of one side of the louvers than the other.
OPERATION
Airow Adjustment
Figure 301 (AIRFLOW SELECTION AND ADJUSTMENT)
Left and right
Adjustment
Up and Down
Adjustment

15 PB
OPERATION
User Interface
All of the control panel function buttons and mode icons can be viewed in Figures 302.
Power On – Press the button to turn on the air conditioner. The power button illuminates to indicate that the power is on. The
backlight on the power switch will automatically turn off after 20 seconds of inactivity. The remote control can also be used to
turn power ON / OFF (see Remote Control).
Display – The display is a high efciency LCD with a built-in backlight. After 20 seconds of inactivity, the display switches off.
Touching any button automatically changes the display to full brightness.
There are three control push buttons on each side of the display.
CONTROL PANEL AND DISPLAY
Figure 302
-AUTO-
Automatically switches
between cool & heat
CONTROL
LOCKED
WI-FI OPERATING
STATE
TEMPERATURE
UP
TEMPERATURE
DOWN
2 DIGIT DISPLAY
Shows Setting for:
- Set Point (Temperature)
- Clock (AM/PM)
FILTER
Check / clean
FAN SPEED
Sets fan speed:
LOW, MED, HIGH,
or MAX (Selected
Models Only)
FAN
Sets fan to either:
- Automatically cycle
- Continuously run
COOL HEAT FAN ONLY DISCONNECTED FROM
POWER BOARD
MODE
Cycles between
COOL, HEAT, FAN
ONLY or -AUTO-
(if equipped)
ON / OFF
Turns unit on/off
TIMER
shows on or off

16 PB
OPERATION
User Interface
Accessing Sub-Menus
The MENU button accesses the sub-menu. See Figure 10.
Figure 303
MENU RETURN
Press the Menu Button to enter the Menu. See Figure 303.
The arrow buttons navigate the 6 menu options. See Figure 304.
– LIM – LOCK
– TM – CnCT
– F-C – diAG
The return button exits the menu. See Figure 304.
Figure 304
MENU RETURN
Figure 305
MENU RETURN

17 PB
OPERATION
User Interface
Navigating Inside the Sub-Menus
The MENU button moves you forward through the sub-menu. See Figure 306.
The return button moves you backward once inside the LIM, TM, F-C, LOCK, CnCt, and diag menus. See Figure 306.
MENU RETURN
Figure 306 (Menu and Return Buttons)

18 PB
OPERATION
User Interface
The LIM Menu (LIMIT)
This is the limit menu. See Figure 307.
Upon entering the menu, the rst option will be to set the lower setpoint limit using the arrow buttons. See Figure 308.
Then you can set the higher setpoint limit using the arrow buttons. See Figure 309.
Pressing the menu button completes the limit setting. See Figure 306.
Figure 307
MENU RETURN
Figure 308
MENU RETURN
Figure 309
MENU RETURN

19 PB
MENU RETURN
OPERATION
User Interface
The TM Menu (Timer)
This is the TM menu used to set a timer. See Figure 310.
In the menu, you set the current time using the arrow buttons. See Figure 311. (Note: These two “set clock” steps will be
skipped if the unit is already connected to Wi-Fi.)
First, set the hour.
Using the MENU button, you switch to the minutes and complete setting the time. See Figure 306.
You select your mode. Either cool, heat, or auto. Toggle these using the mode button. See Figure 312. (Note: cooling-only
models skip this step.)
The process is the same for all three modes. Auto mode will be shown as the example.
Figure 310
MENU RETURN
Figure 311
MENU RETURN
Figure 312

20 PB
MENU RETURN
MENU RETURN
OPERATION
User Interface
The TM Menu (Timer) continued
Auto mode selected. See Figure 313.
Set the cool setpoint for your rst timer period using the arrow buttons. The cooling mode timer only sets the cool setpoint.
See Figure 314.
Next, set the heat setpoint for your rst timer period. The heating mode timer only sets the heat setpoint. See Figure 315.
Note: The auto mode timer sets both the cool and heat setpoint.
Set the time to start the rst timer period. See Figure 316.
Figure 313
Figure 314
MENU RETURN
Figure 315
Figure 316
MENU RETURN