Bryant FA4A User Manual
Service manual, Utc tech pub, Fan coil units
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Table of contents
Document Outline
- FAN COIL UNITS
- o
- INTRODUCTION
- UNIT IDENTIFICATION
- FA4A, FB4A, FC4B, AND FR4A CIRCUIT BOARD FUNCTION AND TROUBLESHOOTING
- I. PRINTED CIRCUIT BOARD (PCB) COMPONENT LAYOUT AND DESCRIPTION
- II. UNIT FUNCTIONS
- A- Transformer
- B. Indoor Fan
- pig. 4—^Wiring Diagram
- fe. If Electric Hegt Stages Will Not Turn On But Fan Will Turn On:
- ELECTRIC HEATER FUNCTION AND TROUBLESHOOTING
- I. DESCRIPTION OF ELECTRIC HEATER COMPONENTS
- A. Limit Switch
- II. TROUBLESHOOTING KFA AND KFB SERIES
- A. Discolored Wire Insulation at Tormincl
- C. No Heat
- D. Heater Will Not Turn Off
- FK4B FAN COIL DESCRIPTION AND TROUBLESHOOTING
- I. INTEGRATED CONTROLS AND MOTOR (ICM2)
- II. PCB LAYOUT AND DESCRIPTION
- III, SEQUENCE OF OPERATION
- A. Continuous Fan Mode
- И. CFM Select Configuration Taps
- IV, EASY SELECT CONFIGURATION TAPS
- A. Auxiliary Heat Range
- Fig, 6—Easy
- Select Board
- V. TROUBLESHOOTING PCB
- A. If Fan Wilt Not Turn On Ftom Thermostat:
- B, If Electric Heat Stages Will Not Turn On But Fan WIN Turn On:
- c
- 320486-301 REV. C
- C. If PCB Fuse Keeps Blowing:
- VI. TROUBLESHOOTING ICM2 FAN MOTOR
- A. If Motor Does Not Run:
- B. If Motor Does Not Run Smoothly;
- C. If Motor Shaft Does Not Rotate Smoothly:
- VII. CONDENSED VERSION OF TROUBLESHOOTING FK4B MOTOR AND CONTROLS
- + ROOM THERMOSTAT
- Fig. Э—Wiring Harness 16-Ptn Plug
- VIII. ACCESSORIES
- THERMOSTATIC EXPANSION VALVES (TXV)
- I. PROBLEMS AFFECTING TXV
- A. Low Suction Pressure
- B. High Suction Pressure
- PISTON BODY CLEANING OR REPLACEMENT
- LIQUID TUBE STRAINER
- COIUCONDENSATE PAN REMOVAL AND replacement
- I. A-COIL UNITS
- II. SLOPE COIL UNITS .
- CARE AND MAINTENANCE
- I. FILTER ASSEMBLY
- II. COOLING COIL, DRAIN RAN, AND CONDENSATE DRAIN
- III. BLOWER MOTOR AND WHEEL
- FF1A/FF1B SERVICE AND TROUBLESHOOTING
- L FAN MOTOR
- II. ELECTRIC HEATER SERVICE
- A. Limit Switch
- C. Transformer
- D. Fan Relay
- III. CLEANING OR REPLACING REFRIGERANT FLOW- CONTROL DEVICE
- IV. LIQUID TUBE STRAINER
- V. SEQUENCE OF OPERATION
- COOLING
- 316596-401 REV. B
- 40DQ500784 REV. C
- )V. LIQUID TUBE STRAINER
- V. CARE AND MAINTENANCE
- A. Motor
- Fig. 21—Checking Pulley Alignment and Tightness
- D. Cleaning or Replacing Refrigerant Flow-Control Device
- II, MAINTENANCE
- A, Return-Air Filter
- B. Coil, Drain Pan, and Condensate Drain
- FA4A, FB4A. AND FC4B SMART HEAT CIRCUIT BOARD FUNCTION AND TROUBLESHOOTING
- I. PCB COMPONENT LAYOUT, DESCRIPTION, AND FUNCTION
- UNIT FUNCTIONS
- A. Transformer
- B. Electric Heat
- TABLE 7—ELECTRIC
- C. Acces^Órics
- D. Blower
- HEATER STAGE LIMITING
- IIL SMART HEAT OPERATION
- A. Cooling
- C- Defrost
- P. Troubleshooting PrInted-CIrcult Board (Diagnostic LED)
- IV. ELECTRICAL OPERATING SEQUENCES AND TROUBLESHOOTING
- B. Continuous Fan
- C. Cooling
- D. Heating (Compressor Only)
- TABLE 9--TROUBL1ESHOOTING VOLTAGE READINGS AND TEST POINTS
- INPUT VOLTAGES
- Li and L2
- SEC1 and SEC2
- Y and C
- R Checking Sequencer Operation
- following:
- 320486-301 REV. C