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)