valutazioni - 3, GPA: 4 ( )

Produttore : Carrier File Size : 2.43 mb File Nome : Lingua di insegnamento:

If more than one error code exists, all applicable codes will be displayed in numerical sequence findicates a code that is not an error. The unit will continue to operate when this code is displayed. IMPORTANT: Refer to Troubleshooting Tables 19-22 for additional information. Main Burners — At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe the main burner flames and adjust, if necessary. A CAUTION When working on gas train, do not hit or plug orifice spuds. REMOVAL OF GAS TRAIN (Fig. 36 and 37) 1. Shut off manual gas valve. 2. Shut off power to unit. 3. Remove compressor access panel (not shown). 4. Slide out burner section side panel (not shown). 5. Remove heat shield. 6. Disconnect gas piping at unit gas valve. 7. Remove wires connected to gas valve. Mark each wire. 8. Remove induced-draft motor, ignitor, and sensor wires at the Integrated Gas Unit Controller (IGC) (see Fig. 11). 9. Remove the 2 screws that attach the burner rack to the vestibule plate. 10. Remove the gas valve bracket. 11. Slide the burner tray out of the unit (Fig. 37). 12. To reinstall, reverse the procedure outlined above. CLEANING AND ADJUSTMENT 1. Remove burner rack from unit as described in Removal of Gas Train section, above. 2. Inspect burners; if dirty, remove burners from rack. 3. Using a soft brush clean burners and cross-over port as required. 4. Adjust spark gap. See Fig. 38. 5. Reinstall burners on rack. 6. Reinstall burner rack as described in Replacement of Gas Train section, above. Replacement Parts — A complete list of replacement parts may be obtained from any Carrier distributor upon request. 24 BURNERS Fig. 37 — Burner Tray Details SPARK GAP .125" TO .140" DETAIL ”C” Fig. 38 -Spark Adjustment 25 TROUBLESHOOTING Table 18 — LED Error Code Service Analysis PROBLEM CAUSE REMEDY Hardware failure. (LED OFF) Loss of power to control module (IGC). Check 5 amp fuse on IGC, power to unit, 24 v circuit breaker, and transformer. Units without a 24 v circuit breaker have an internal overload in the 24 v transformer If the overload trips, allow 10 minutes for automatic reset. Limit switch fault. (LED 2 flashes) High temperature limit switch is open. Check the operation of the indoor (evaporator) fan motor. Ensure that the supply-air temperature rise is in accordance with the range on the unit nameplate. Flame sense fault. (LED 3 flashes) The IGC sensed flame that should not be present Reset unit. If problem persists, replace control board 4 consecutive limit switch trips. (LED 4 flashes) Inadequate airflow to unit. Check operation of indoor (evaporator) fan motor and that supply-air temperature rise agrees with range on unit nameplate information. Ignition lockout. (LED 5 flashes) Unit unsuccessfully attempted ignition for 15 minutes. Check ignitor and flame sensor electrode spacing, gaps, etc. Ensure that flame sense and ignition wires are properly terminated. Verify that unit is obtaining proper amount of gas. Induced-draft motor fault. (LED 6 flashes) IGC does not sense that induced-draft motor is operating. Check for proper voltage. If motor is operating, check the speed sensor plug/IGC Terminal J2 connection. Proper connection: PIN 1 — White, PIN 2 — Red, PIN 3 — Black. Rollout switch fault. (LED 7 flashes) Rollout switch has opened. Rollout switch will automatically reset, but IGC will continue to lockout unit. Check gas valve operation. Ensure that induced-draft blower wheel is properly secured to motor shaft. Reset unit at unit disconnect. Internal control fault. (LED 8 flashes) Microprocessor has sensed an error in the software or hardware. If error code is not cleared by resetting unit power, replace the IGC. IMPORTANT: Refer to Table 19 — Heating Service Analysis for additional troubleshooting analysis. LEGEND IGC — Integrated Gas Unit Controller LED — Light-Emitting Diode 26 Table 19 - Heating Service Analysis PROBLEM CAUSE REMEDY Burners will not ignite. Misaligned spark electrodes. Check flame ignition and sensor electrode positioning. Adjust as needed. No gas at main burners. Check gas line for air, purge as necessary. After purging gas line of air, allow gas to dissipate for at least 5 minutes before attempting to relight unit. Check gas valve. Water in gas line. Drain water and install drip leg to trap water. No power to furnace. Check power supply, fuses, wiring, and circuit breaker. No 24 v power supply to control circuit. Check transformer. Transformers with internal overcurrent protection require a cool down period before resetting. Miswired or loose connections. Check all wiring and wire nut connections. Burned-out heat anticipator in thermostat. Replace thermostat. Broken thermostat wires. Run continuity check. Replace wires, if necessary. Inadequate heating. Dirty air filter. Clean or replace filter as necessary. Gas input to unit too low. Check gas pressure at manifol...

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