Carrier FA4ANF User Manual

Residential Fan Coil Units
Service Manual
TABLE OF CONTENTS
Page
SAFETY CONSIDERATIONS...................................................2
INTRODUCTION........................................................................2
UNIT IDENTIFICATION...........................................................2
PRODUCT OFFERING..............................................................4
FAN MOTOR SPEED TAPS .....................................................4
FA4A, FB4A, FC4B, FF1D, FH4A, AND FX4A
CIRCUIT BOARD FUNCTION AND TROUBLESHOOTING
— CES013003-00 and -01 PCB...............................................2-7
• Printed Circuit Board Component Layout and Description.......2
• Unit Functions ............................................................................2
• Troubleshooting PCB..................................................................4
CIRCUIT BOARD FUNCTION AND TROUBLESHOOTING
— HK61GA001 and HK61GA003 PCB .........................6-19
• Printed Circuit Board Component Layout and Description.......6
• PCB Component Functions.........................................................7
• Troubleshooting PCB................................................................11
ELECTRIC HEATER FUNCTION
AND TROUBLESHOOTING..............................................18
• Description of Electric Heater Components.............................19
• Troubleshooting KFA, KFB, KFC, and KFD Series
Electric Heaters.......................................................................20
FAN COIL DESCRIPTION AND
TROUBLESHOOTING — FK4B .................................20-27
• Integrated Controls and Motor (ICM2)....................................20
• PCB Layout and Description....................................................20
• Sequence of Operation..............................................................21
• Easy Select Configuration Taps................................................22
• Troubleshooting PCB................................................................25
• Troubleshooting ICM2..............................................................25
• Condensed Version of Troubleshooting FK4B Motor
and Controls ...............................................................................27
• Accessories ................................................................................27
FAN COIL DESCRIPTION AND
TROUBLESHOOTING — FK4C, FV4A, 40FKA.........28-35
• Integrated Controls and Motor (ICM2)..................................28
• PCB Layout and Description..................................................29
• Sequence of Operation............................................................29
• Easy Select Configuration Taps..............................................32
• Troubleshooting PCB..............................................................33
• Troubleshooting ICM2............................................................33
• Condensed Version of Troubleshooting
FK4C, FV4A, 40FKA Motor and Controls.........................33
• Accessories ..............................................................................35
THERMOSTATIC EXPANSION VALVES (TXV)............36
• Problems Affecting TXV........................................................36
PISTON BODY CLEANING OR REPLACEMENT..........36
LIQUID TUBE STRAINER ...................................................37
FA, FB, FC, FK COIL/CONDENSATE PAN
REMOVAL AND REPLACEMENT..........................37-38
• A-Coil Units ............................................................................37
• Slope Coil Units......................................................................37
FX, FV, 40FKA COIL/CONDENSATE PAN REMOVAL
AND REPLACEMENT ................................................38-40
CARE AND MAINTENANCE...............................................39
• Filter Assembly .......................................................................39
• Cooling Coil, Drain Pan, and Condensate Drain...................39
• Blower Motor and Wheel .......................................................40
FF1A/FF1B/FF1C SERVICE AND
TROUBLESHOOTING................................................40-42
• Fan Motor................................................................................40
• Electric Heater Service............................................................40
• Cleaning or Replacing Refrigerant Flow-Control Device .....42
• Liquid Tube Strainer ...............................................................42
• Sequence of Operation............................................................42
• Care and Maintenance.............................................................42
FD3A SERVICE AND TROUBLESHOOTING...............43-45
• Fan Motor..................................................................................43
• Electric Heater Service..............................................................43
• Cleaning or Replacing Refrigerant Flow-Control Device .......43
• Liquid Tube Strainer .................................................................45
• Care and Maintenance...............................................................45
FG3A SERVICE AND TROUBLESHOOTING....................46
• Service .......................................................................................46
• Maintenance...............................................................................46
FA4A, FB4A, FC4B, FX4A SMART HEAT CIRCUIT
BOARD FUNCTION AND TROUBLESHOOTING..46-50
• PCB Component Layout, Description, and Function...............46
• Unit Functions ...........................................................................47
• Smart Heat Operation................................................................48
• Electrical Operating Sequences and Troubleshooting..............48
PURON® (R-410A) QUICK REFERENCE GUIDE.............51
Fig. 1—Typical Fan Coil
A98023
Visit www.carrier.com
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 3d 2e
PC 101 Catalog No. 03FA-4A3 Printed in U.S.A. Form F-5SM Pg 1 6-99 Replaces: F-4SM

Carrier FA4ANF Specifications

General

Brand	Carrier
Model	FA4ANF
Category	Air Conditioner
Language	English

Summary

Safety Considerations

Introduction

Unit Identification

FA4A, FB4A, FC4B, FF1D, FH4A, AND FX4A Circuit Board Function and Troubleshooting CES0130003-00 and -01 PCB

Step 1-Printed Circuit Board (PCB) Component Layout and Description

Describes the CES0130003-00 and -01 PCB by examining functional operation of its components.

Step 2-Unit Functions

Explains the functional operation of Transformer, Indoor Fan, and Electric Heat components.

Step 3-Troubleshooting the Printed-Circuit Board

If Transformer Fuse Keeps Blowing

Circuit Board Function and Troubleshooting HK61GA001 and HK61GA003 PCB

Step 1-PCB Component Layout and Description

Layout and description of components on the HK61GA001 and HK61GA003 PCBs.

Step 2-PCB Component Functions

If the PCB Has High Voltage Applied to It

If the Traces Are Burnt Off the Back of the PCB

If There Are Blown Diodes

The PCB Fuse Keeps Blowing

The Fan Runs Continuously

Electric Heater Function and Troubleshooting

Step 1-Description of Electric Heater Components

Step 2-Troubleshooting KFA, KFB, KFC, and KFD Series Electric Heaters

Discolored Wire Insulation at Terminal

Checking quick-connect terminals for discoloration and high resistance.

Fuse Failure

Troubleshooting steps for fuse failure in electric heaters.

No Heat

Troubleshooting steps when the electric heater does not turn on.

Heater Will Not Turn Off

Troubleshooting steps when the electric heater does not turn off.

Fan Coil Description and Troubleshooting FK4B

Step 1-Integrated Controls and Motor (ICM2)

Explains the ICM2, its connection, and power supply for the FK4B Fan Coil.

Step 2-PCB Layout and Description

Describes the single PCB that interfaces the variable-speed ICM2 with system components.

Step 3-Sequence of Operation

Heat Pump Heating Mode-Two-Speed Low

Heat Pump Heating with Auxiliary Electric Heat

CFM Select Configuration Taps

ICM2 Control Power

Auxiliary Heat Range

AC/HP Size

System Type

AC/HP CFM Adjust

AC/HP Time Delay

Step 13-Troubleshooting PCB

If Fan Will Not Turn On From Thermostat

Troubleshooting steps when the fan will not turn on from the thermostat.

If Electric Heat Stages Will Not Turn On But Fan Will Turn On

Troubleshooting steps for electric heat stages not turning on, but fan does.

If Traces Are Overheated on Back of PCB

Troubleshooting steps for overheated traces on the PCB.

If PCB Fuse Keeps Blowing

Troubleshooting steps when the PCB fuse repeatedly blows.

Step 14-Troubleshooting ICM2 Fan Motor

If Motor Does Not Run

Steps to diagnose why the ICM2 fan motor is not running.

If Motor Does Not Run Smoothly

Steps to diagnose why the ICM2 fan motor is not running smoothly.

If Motor Shaft Does Not Rotate Smoothly

Troubleshooting steps for a stiff or difficult to turn motor shaft.

If Motor Does Not Stop Running

Troubleshooting steps if the motor does not stop running.

If Motor Does Not Stop Running

Step 7-Condensed Version of Troubleshooting FK4B Motor and Controls

+ Motor

Troubleshooting tips for motor issues like hard turning or not running.

+ Circuit Board

Troubleshooting steps for the circuit board, including fuse and burn spots.

+ Room Thermostat

Steps to diagnose thermostat issues by checking wiring and jumper connections.

+ Wiring Harness

Troubleshooting steps for the wiring harness, checking voltages and connections.

Step 8-Accessories

FK4C, FV4A, and 40FKA

Step 9-Integrated Controls and Motor (ICM2)

Explains the ICM2, its connection, and power supply for the FK4C, FV4A, 40FKA Fan Coils.

Step 10-PCB Layout and Description

Step 11-Sequence of Operation

Electric Heat Heating Mode

Heat Pump Heating Mode-Comfort Heat with 40FKA

Heat Pump Heating Mode-Two-Speed Low

Heat Pump Heating with Auxiliary Electric Heat

ICM2 Control Power

Low-Voltage Circuit Fusing and Reference

Auxiliary Heat Range

AC/HP Size

System Type

AC/HP CFM Adjust

AC/HP Time Delay

Continous Fan

Step 13-Troubleshooting PCB

If Fan Will Not Turn On From Thermostat

Troubleshooting steps when the fan will not turn on from the thermostat.

If Electric Heat Stages Will Not Turn On But Fan Will Turn On

Troubleshooting steps for electric heat stages not turning on, but fan does.

If Traces Are Overheated on Back of PCB

Troubleshooting steps for overheated traces on the PCB.

If PCB Fuse Keeps Blowing

Troubleshooting steps when the PCB fuse repeatedly blows.

Step 14-Troubleshooting ICM2 Fan Motor

If Motor Does Not Run

Steps to diagnose why the ICM2 fan motor is not running.

If Motor Does Not Run Smoothly

Steps to diagnose why the ICM2 fan motor is not running smoothly.

If Motor Shaft Does Not Rotate Smoothly

Troubleshooting steps for a stiff or difficult to turn motor shaft.

If Motor Does Not Stop Running

Troubleshooting steps if the motor does not stop running.

Step 16-Accessories

FK4C, FV4A, and 40FKA De-Humidify Mode

Thermostatic Expansion Valves (TXV)

Step 1-Problems Affecting TXV

Lists common problems affecting TXV operation like low/high suction pressure.

Piston Body Cleaning or Replacement

Procedure for cleaning or replacing the piston body in flow-control devices.

Liquid Tube Strainer

FA, FB, FC, FK Coil/Condensate Pan Removal and Replacement

Step 1-A-Coil Units

Detailed steps for removing and replacing A-coil units.

FX4A and FV4A Coil/Condensate Pan Removal and Replacement (Puron Refrigerant)

Step 1-A-Coil Units

Detailed steps for removing and replacing A-coil units with Puron refrigerant.

Care and Maintenance

Step 1-Filter Assembly

Instructions for cleaning or replacing the air filter assembly.

Step 2-Cooling Coil, Drain Pan, and Condensate Drain

Procedures for inspecting and cleaning the cooling coil, drain pan, and condensate drain.

Step 3-Blower Motor and Wheel

FF1A/FF1B/FF1C Service and Troubleshooting

Step 1-Fan Motor

Troubleshooting steps for the 2-speed direct drive fan motor.

Step 2-Electric Heater Service

Service procedures for electric heaters, including limit switch and sequencer.

Step 3-Cleaning or Replacing Refrigerant Flow-Control Device

Step 4-Liquid Tube Strainer

Step 5-Sequence of Operation

Condensing Unit

Sequence of operation for the condensing unit in cooling mode.

Heating

Sequence of operation for heating mode with electric heaters.

Heat Pump

Sequence of operation for heat pump cooling and heating modes.

Step 6-Care and Maintenance

FD3A Service and Troubleshooting

Step 1-Fan Motor

Troubleshooting steps for the 2-speed direct drive fan motor.

Step 2-Electric Heater Service

Service procedures for electric heaters, including limit switch and sequencer.

Step 3-Cleaning or Replacing Refrigerant Flow-Control Device

Instructions for cleaning or replacing the refrigerant flow-control device.

Step 4-Liquid Tube Strainer

Step 5-Care and Maintenance

FG3A Service and Troubleshooting

Step 1-Service

Covers motor, blower, and pulley/belt checks and adjustments.

Cleaning or Replacing Refrigerant Flow-Control Device

Step 2-Maintenance

FA4A, FB4A, FC4B, AND FX4A Smart Heat Circuit Board Function and Troubleshooting

Step 1-PCB Component Layout, Description, and Function

Describes the PCB layout, components, and their functions for Smart Heat.

Step 2-Unit Functions

Transformer

Details transformer wiring and connections for primary and secondary sides.

Electric Heat

Explains electric heat operation, staging, and thermostat inputs.

Step 4-Electrical Operating Sequences and Troubleshooting

Ready-to-Start

Checks for proper voltage and LED status in the ready-to-start mode.

Continuous Fan

Diagnosing continuous fan operation by checking voltage and thermostat signals.

Cooling

Heating (Compressor Only)

Heating (Compressor and Electric Heat)

Checking Sequencer Operation

Puron (R-410A) Quick Reference Guide for Installers and Technicians