Carrier FA4ANF Service Manual

IF FAN RUNS CONTINUOUSLY:1. If PCB has no low-voltage power, check blue and black fanleads. These may be switched at sequencer/relay.2. If PCB has low-voltage power, check fan relay to see if it isopening and closing. It may be stuck in the normally-closedposition due to debris in relay.TRANSFORMER FAILURE:1. Check 208-v and 230-v transformer connections. They may bemiswired.CIRCUIT BOARD FUNCTION AND TROUBLESHOOTINGHK61GA001 and HK61GA003 Circuit BoardsThis section of the service manual describes the HK61GA001 andHK61GA003 printed-circuit boards (PCB) by examining thefunctional operation of the printed-circuit board’s components.Step 1—PCB Component Layout and DescriptionLayout of the actual printed-circuit boards are depicted inFig. 6 and Fig. 7.1. The low-voltage terminal board is used to connect the indoorthermostat to the low, 24-v side of the transformer, and toserve as a junction between the indoor thermostat and theoutdoor section.2. Break off the tabs.a. W2-3 — Used to control (stage) the second stage of electricheat. The first stage controlling electric heat and the indoorfan are interlocked through diodes.b. W2-E — Used to control (stage) the third stage of electricheat.3. A fuse is used to protect the low-voltage transformer.4. AUX 1 and AUX 2 are connections for the latent capacitycontrol, delay off kit, 2-speed kit and air conditioning acces-sories.5. F1, F2, F3, and F4 are connections for the indoor fan.6. EAC1 and EAC2 are 240-v connections, which parallel fanlead connections, for the electronic air cleaner.7. L1 and L2 are 240-v connections which parallel power input.8. T1, T2 and T3 are connections for the primary, high-voltageside of the transformer.9. The fan relay is controlled by the thermostat and turns the fanon and off.10. A plug is used as the connection for the PCB power andelectric heaters. Note the pin numbers on the plug.11. Diodes provide DC power for the fan relay and the first stageof electric heat: W2, W3 or E.Fig. 3B—FF1D Typical Wiring DiagramA98229SEE NOTE #7F1NONCSPTOUTDOORUNITGPCBBLKCINDOORTHERMOSTATBARRIERCTRFRNOTES:SEE RATING PLATE FOR VOLTS & HERTZDISCONNECT PER NECFIELD POWER WIRINGCOOLING CONTROLSELECTRIC HEAT230V208VBRNREDTRANCOMGRN/YELGNDYELLOHICOMREDYELBLK FMBRN BRNCAPRELAY 122 VDC COILR E CSCHEMATIC DIAGRAMCOMPONENT ARRANGEMENTCAUTION:ATTENTION:NOT SUITABLE FOR USE ON SYSTEMS EXCEEDING 150V TO GROUNDNE CONVIENT PAS AUX INSTALLATIONS DE PLUS DE 150 V A LA TERRECOM208 V230 VTRANRED24 VBRNGNDNCNOSPTFRTC1RGPCBFL2 L1DISC60A 60ARED-LOWBLK-HIGRN/YEL-GNDFM BRNBRNYEL-COMFAN MOTOR THERMALLY PROTECTEDCAPGNDSEE NOTE #5LEGENDREDORN VIOGND2HTR2 BLK 8LS2 6HTR1 BLK 4LS1 RELAY 1YEL BLKSEE NOTE #1BLKSYSTEM TRANSFORMER: 40.0VAFAN COIL/HEATER: 8.4VAREMAINING VA AVAILABLE: 31.6VAREC0 128 64RELAY 1CAP CAPACITORCOM COMMONF FUSEFM FAN MOTORFIELD POWER WIRINGFR PCB FAN RELAYEQUIPMENT GROUNDGNDSPT FAN SPEED TAP LOCATIONHTR HEATERLS LIMIT SWITCHMARKED TERMINALPLUG AND RECEPTACLEPCB PRINTED CIRCUIT BOARDREC RECTIFIERTRAN TRANSFORMERUNMARKED TERMINALR W G324494-101 REV. A1. Use copper wire (75¡c min) only between disconnect switch and unit.2. To be wired in accordance with nec and local codes.3. If any of the original wire, as supplied, must be replaced, use the same orequivalent type wire.4. Replace low voltage fuse with no greater than 5 AMP fuse.5. (2) Speed Motor uses HI (BLK) and LOW (RED).6. Smaller heaters will have fewer components.7. Connect R to R, G to G, etc., see outdoor instructions for details.8. Cooling controls wiring not used with electric heaters.HTR HTRLS LSDISC DISCONNECTYELYELBLU BLKBRNRED GRYGRYORNYEL BLK DISCDISCBLUBLK DISCYEL DISCVIOBLKSEE NOTE #8SEE NOTE #8YELL1SEE NOTE #6L1 L2 L2MINIMUM MOTOR SPEED SELECTIONFAN COIL SIZEMOTOR SPEED ONE HTRMOTOR SPEED TWO HTRLOLO LOLO LOLO018 024 030ROTATIONThis compartment must be closed exceptwhen servicing.6