UH68ODK Tent Heater
Troubleshooting Procedures
1.1Fuel Supply – See PMCS
1.2Check Flame Switch – the flame switch is a normally open heat sensitive switch. The UH68G has two switches. As used in the 68 outdoor kit, only the normally open switch is active. Normally switch 1, red and brown wires, is used. The other switch is normally open and is not used.
1.3Check Fuel Pump – The fuel pump operates on 24vdc. Energize the pump and listen for operation. Remove outlet connector and check for fuel flow. Pump develops about 4 psi., if fuel
slowly runs from pump, clean filter as defined in PMCS. If fuel runs out of pump at a good steady rate pump is ok.
1.4Check Fuel Flow at Carburetor – remove fuel needle (1), start heater. when combustion blower comes on fuel should run from the fuel needle hole. If not fuel flow has been stopped up stream. Check fuel solenoid and float bowl needle and seat.
1.5Check Ignition Transformer – CAUTION! The ignition transformer develops 10,000 volts. Disconect ignition cable form igniter. Position spring at tip of cable not more than 1/8 inch from grounded surface. Turn heater on. If no spark is detected, check power to igniton transformer.
1.6Check Overheat Thermostat – the overheat thermostat (1) is a normally closed temperature sensitive switch. Disconnect wires from switch, and check continuity across switch.
