Friedrich Wallmaster WCT08A10A User manual

1 PB

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:

2 PB

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

3 PB

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

4 PB

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)

5 PB

• 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

6 PB

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)

7 PB

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

8 PB

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

9 PB

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

10 PB

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

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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