Bryant FA4A - Manual

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Service Manual
FAN COIL UNITS
; - IM'
■ S': ■ ■ Tis
■■■'-- ■ ■
f ABLE OF CONTENTS
... ■ -i'
SAFETY considerations ................................................................. 1-3
iNTROPucTioi^ ....................................................^................................. 3
UNIT irtENTIUCATiON ........ .................................T........................2-^
PRODUCT OFEERMG..........................................................................3
FAN MOTOR STEBfi TATS......................... ....................................... 3
FA4A, FB4A, FC4B, AKD FH4A CIRCUIT BOARD
FUNCTIONJ^TROORLE^^ 3^6
■ Printed GirciiitBoifd jfPCB) CqmpijSntjjt ^Layout and Description
• Unit Functions
■_. ■ , fj I
• Troubleshooting PCB 'i; ''
ELECTRIC HEATER FUNCTION
AND TROUBLESHOOTiNG^„„„„;„,,........................................6-7
*-Description of Electric Heater Components
- Troubleshooting KFA and KFB Scries Electric Heaters
FK4B FAN COIL DESCRIPTION
■ I ^'J'f
AND TROUBLESHOOTING................... .................................. 7-lS
• Integrated Controls and Motor (ICM2)
■ • PCB Layout and Description
• ,St( 5 iience of Operation
• Easy Select Configuration Taps ' : "
• Troubleshooting PCB " >
• Troubleshooting ICM2 ' ■ it'
■ Condensed Version of Troubleshooting Motor
. and Controls
• Accessories . ,
THERMOSTATIC EXPANSION VALVEis (TXV)....................... 15
' Problems Affecting "DCV
PISTON BODY CLEANING OR REPl^'CEMENT.................... 15-16
LIQUID TUBE STRAINER............................................................
coil / condensate fan removal
AND replacement ....................................L.............................16-17
- A-Coil Units
‘ Slope Coil Units
CARE AND MAINTENANCE................ ..................................... 17-lS
■ Filter Assembly.
• Cooling Coil, Drain Tan, and Condensate Drain
• Blower Motor and Wheel
■■iC ;
FFIA/FFIB SERVICE AND TROUBLESHOOTING................. 18-21
• Fan Motor ■
• Electric Heater Service
• Cleaning or Replafcmg Refrigerant Flow^Control Device
• Liquid Tube Strainer
.■ iyi:.,.
' Sequence of Operation if 2
• Care and Maintenance
FD3A SERVICE AND TROUBLESHOOTING...........................21-23
• Fan Motor - ;
• Electric Heater Service
- Cleaning or Replacing Refrigerant Flow-Control Device
• Liquid Tube Strainer
• Care and Maintenance
FG3A SERVICE AND TROUBLESHOOTING...........................23-24
- Service
• Maintenance
i ;
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^I3anc0ls; SM03-1 SM03-2
1-1-95
A9£071
Fig. 1—Typical Fan Coll
FA^A, FB4A, AND FC4B SMART HEAT CIRCUIT BOARD
IhJNCTION AND TROUBLESHOOTING............................... 24-29
• PCB Component Layout, Description, and Function
■ Unit Functions
• Smart Heat Operation
• Electrical Operating Sequences and Troubleshooting
, i SAFETY CONSIDERATIONS
Ij^proper installation, adjustment, alteration, service, maintenance,
of use Can cause explosion, fire, electrical shock, or other
conditions which may cause personal injury or property damage.
CpnSult a qualiSed installer, service agency, or your distributor or
blknch for information or assistance. The qualified installer or
agency must use factory-authoriied kits or accessories when
modifying thiS;pfoduct. Refer to the individual installation instruc­
tions packaged With the kits or accessories for detailed informa­
tion..
Follow all Safety codes. Wear safety glasses and work gloves. Use
quenching cloth for bracing operations. Have fire extinguisher
avmlable. Read these instructions thoroughly and follow all
warnings or cautions attached to the unit. Consult local building
m'dës and National Eectricai Code (NEC) for special installation
requirements-
It is important to recognize safety information. This is the
safety-alert symbol^j^ , When you sec this symbol on the unit or in
instructions and manuals, be alert to the potential for personal
injury.
Understand the signal words DANGER, WARNING, and CAU­
TION. These words are used with the safety-alert symbol, DAN-
GER identifies the most serious hazards which will result in severe
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