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
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