Carrier FB4ASF - 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 FB4ASF Specifications

General

Brand	Carrier
Model	FB4ASF
Product Type	Air Conditioner
Refrigerant	R-410A
Coil Type	Aluminum
Warranty	10-Year Limited Parts Warranty
Cooling Capacity	1.5 - 5 Ton

Summary

SAFETY CONSIDERATIONS

CES0130003-00 and -01 PCB

Details the component layout and function of CES0130003-00 and -01 PCBs.

FA4 A, FB4 A, FC4 B, FF1 D, FH4 A, AND FX4 A CIRCUIT BOARD FUNCTION AND TROUBLESHOOTING

CIRCUIT BOARD FUNCTION AND TROUBLESHOOTING HK61 GA001 and HK61 GA003 Circuit Boards

Step 1-PCB Component Layout and Description

Describes the layout and components of the HK61GA001/HK61GA003 PCBs.

ELECTRIC HEATER FUNCTION AND TROUBLESHOOTING

FAN COIL DESCRIPTION AND TROUBLESHOOTING FK4 B

Step 1-Integrated Controls and Motor (ICM2)

Details the ICM2 integrated controls and motor for FK4B units.

FK4 C, FV4 A, and 40 FKA

Step 9-Integrated Controls and Motor (ICM2)

Details the ICM2 integrated controls and motor for FK4C/FV4A/40FKA.

FA, FB, FC, FK COIL;CONDENSATE PAN REMOVAL AND REPLACEMENT

FF1 A;FF1 B;FF1 C SERVICE AND TROUBLESHOOTING

FD3 A SERVICE AND TROUBLESHOOTING

Step 1-Fan Motor

FG3 A SERVICE AND TROUBLESHOOTING

FA4 A, FB4 A, FC4 B, AND FX4 A SMART HEAT CIRCUIT BOARD FUNCTION AND TROUBLESHOOTING

Step 1-PCB Component Layout, Description, and Function

Layout, description, and function of Smart Heat PCB components.

Step 2-Unit Functions

ELECTRIC HEAT

Step 3-Smart Heat Operation

How the Smart Heat system operates in cooling and heat pump modes.

TROUBLESHOOTING PRINTED-CIRCUIT BOARD (DIAGNOSTIC LED)

Using the diagnostic LED for PCB troubleshooting.

Step 4-Electrical Operating Sequences and Troubleshooting

Electrical sequences and troubleshooting steps for Smart Heat.

→ PURON (R-410 A) QUICK REFERENCE GUIDE FOR INSTALLERS AND TECHNICIANS