Assessments - 2, GPA: 3 ( )

Fabricante : Honeywell Arquivo Tamanho: 1.22 mb Arquivo Nome : Língua de Ensino:

— Check for good metal-to-metal contact between the pilot burner bracket and the main burner. — Check the ground lead from the GND(BURNER) terminal on the module to the pilot burner. Make sure connections are clean and tight. If the wire is damaged or deteriorated, replace it with No. 14-18 gauge, moisture-resistant, thermoplastic insulated wire with 105° C [221° F] minimum rating. —Check the ceramic flame rod insulator for cracks or evidence of exposure to extreme heat, which can permit leakage to ground. Replace pilot burner/igniter-sensor and provide shield if necessary. —If flame rod or bracket are bent out of position, restore to correct position. STEP 3: Check spark ignition circuit. • Disconnect the ignition cable at the SPARK terminal on the module. WARNING The ignition circuit generates over 10,000 volts and electrical shock can result. Energize the module and listen for the audible sparking noise. When operating normally, there should be a buzzing noise that turns on and off twice per second for a duration of 1–7 seconds, depending on the model. STEP 4: Check pilot and main burner lightoff. • Set the system to call for heat by turning the thermostat above room temperature. • Watch the pilot burner during the ignition sequence. See if: — Ignition spark continues after the pilot is lit. — The pilot lights and the spark stops, but main burner does not light. • If so, ensure adequate flame current as follows. — Turn off furnace at circuit breaker or fuse box. — Clean the flame rod with emery cloth. — Make sure electrical connections are clean and tight. Replace damaged wire with moisture-resistant No. 18 wire rated for continuous duty up to 105° C [221° F]. — Check for cracked ceramic insulator, which can cause short to ground, and replace igniter-sensor if necessary. — At the gas valve, disconnect main valve wire from the MV terminal. — Turn on power and set thermostat to call for heat. The pilot should light but the main burner will remain off because the main valve actuator is disconnected. — Check the pilot flame. Make sure it is blue, steady and envelops 3/8 to 1/2 in. [10 to 13 mm] of the flame rod. See Fig. 11 for possible flame problems and their causes. — If necessary, adjust pilot flame by turning the pilot adjustment screw on the gas control clockwise to decrease or counterclockwise to increase pilot flame. Following adjustment, always replace pilot adjustment cover screw and tighten firmly to assure proper gas control operation. — Set temperature below room setpoint to end call for heat. • Recheck ignition sequence as follows. — Reconnect main valve wire. — Adjust thermostat above room temperature. — Watch ignition sequence at burner. — If spark still doesn’t stop after pilot lights, replace module. — If main burner doesn’t light or if main burner lights but system locks out, check module, ground wire and gas control as described in appropriate troubleshooting chart. Troubleshooting Error Codes The integrated boiler control uses...

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