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\é TABLE OF CONTENTS J Pa# SAFETY CQNSÎDERÀTIONS..............IL............................1-3 INTRODUCTION V:..................................................................3 UNIT IDENTIFICATION ..1....................7......................2-£ PRODUCT OFFERING..............................................................3 FAN MOTOR SPEED TAPS.............................................3 FA4A, FB4A, FC4B, .AND FH4A CIRCUIT BOARD FUNCTION AND TROUBLESHOOTING......................3^6 ■ Printed Circuit BoardjfPCB) Component payout and Description • Unit Functions ^, |f ”■ i • Troubleshooting PCB '' ELECTRIC HEATER FUNCTION AND TROUBLESHOOTING............................6-7 • Description of Electric Heater Components ■ Troubleshooting KFA and KFB Scries Electric Heaters FK4B FAN COIL DESCRIPTION .;$№ AND TROUBLESHOOTING...........$.!..........................7-15 • Integrated Controls and Motor (ICM2) ■ * PCB Layout and Description • (Seqnence of Operation va-^ Easy Select Configuration Taps ' : ' ' • Troubleshooting PCB - > • Troubleshooting ICM2 ' ■ ■ Condensed Version of Troubleshooting FÏÊ4E Motor . and Controls • Accessories .. THERMOSTATIC EXPANSION VALVES (TXV)..............15 • Problems Affecting TXV PISTON BODY CLEANING OR REPLACEMENT......15-16 LIQUID TUBE STRAINER............................................./,.,.16 COIL/CONDENSATE PAN REMOVAL AND REPLACEMENT.....................L..„......................16-17 • A-Coil Units ^ • Slope Coil Units CARE AND MAINTENANCE.................«.......................17-18 ■ Filter Assembly. • Cooling Coil, 0rain 'Pan, and Condensate Drain • Blower Motor and Wheel : FF1A/FF1B SERVICE AND TROUBLESHOOTING.....18-21 • Fan Motor & ■ • Electric Heater Service • Cleaning or Replacing Refrigerant Flow-Contro.l Device • Liquid Tube Strainer . iv-:_ • Sequence of Operation • Care and Maintenance FD3A SERVICE AND TROUBLESHOOTING...............21-23 • Fan Motor • Electric Heater Service • Cleaning or Replacing Refrigerant Flow-Comrol Device • Liquid Tube Strainer • Care and Maintenance FG3A SERVICE AND TROUBLESHOOTING...............23-24 • Service • Maintenance Ut.i Cancels: SMQ3-1 SMQ3-2 1-1-95 A92071 Fig. 1—Typieal Fan Coll F A4 A, FB4A, AND FC4B SMART HEAT CIRCUIT BOARD F1JNCTION AND TROUBLESHOOTING..................24-29 • PCB Component Layout, Description, and Function ■ Unit Functions • Smart Heat Operation • Electrical Operating Sequences and Troubleshooting SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, maintenance, dr use can cause explosion, fire, electrical shock» or other conditions which may cause personal injuiy or property damage. ¿nnSult a qualified installer, service agency, or your distributor or ânch for information or assistance. The qualified installer or agency must use factory-authorised kits or accessories when modifying thiS^prodticL Refer to the individual installation instructions packaged With the kits or accessories for detailed information.. Follow all Safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow/ all warnings or cautions attached to the unit. Consult local building ca’d&s and National Electrical Code (NEC) for special installation requirements. It is important to recognize safety information. This is the safety-alert symbol^ , When you see 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 CAUTION. These words are used with the safety-alert symbol, DAN-GER identifies the most serious hazards which will result in severe -1- C\:■ z r^m:- iL.j£:W(A- l:'sM 14 ■ '1516|^f ®ll1 •*. ;i-i" . .■-■J.a ■- '■ L r mmm ... ^ ■'■■' :v ;v.' • :•: - VT^.J .• ••;••• i^T.T; • 2jid- PosÜtion—Fa^ CoiF Ä- RNC B- Standard C - Deluxe D - Furred in, Cased E - Furred in, Uncased F - Through Ihe Wal] G- Commercial H - Standard -Electric Fumace J - Standard Hat Water . K- ICM Motor, High Efficiency V - Variable Speed ' .qyinxo.üni1!;,. I*:!## . N-- .(■;■■■V, v • i /.V - ,y:.-^0: :'7:V 1#* tMim V , •- " . /1 4/2008/THU 03:45 PM UTC TECH PUB FAX No. 31 7 240 5662 TABLE 1—product offering P. 003 MObËL UNIT SIZE DESCRIPTION CABINET FA4ANF 01S-Q60 Multi poise Single Piece FB4ANB 042-070 Multlpolse Modular FB4ANF 018-060 Multipoise Single Piece FB4ASB 042-060 Multipoise 50 Hz Modular FB4ASF 018-060 Multipoise 50 Hz Single Piece FC4BNB 042-070 Multi poise Modular FC4BNF 024-060 Multlpolse Single Piece FD3AMA 018-030 Horizontal Single Piece FF1A/FF1BNA 01S-030 Vertical Single Piece FG3ANA 024, 036, 048, 060 Horizontal/Small Commercial Single Piece FH4ANB 0D3, 004 Multi polss Modular FH4ANF 001-004 Multipoles Single Piece FK4BNB 005, ooe Multipoise Modular FK4BNF 001-004 Multlpolse Single Piece NOTE: Multipoise units are approv...

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