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Replace the burner/control assemblies engaging them fully on their tubes and secure by tightening the screws ensuring that they are squarely positioned (i.e. with the air inlet cover plate facing upwards). C. REFLECTOR – The condition of the reflector should be noted and any necessary cleaning performed. The reflectors can be simply removed for cleaning by removing the reflector clamp screws securing them to the suspension brackets and sliding them out of the suspension brackets. The reflector can be cleaned with a soft cloth and detergent in water. A mild non-abrasive metal polish may be used in cases of extreme discoloration. D. REMOVAL OF BURNER/CONTROL ASSEMBLY – Remove the burner/ control assembly by disconnecting the gas and electrical supply (and fresh air inlet duct if fitted). Slacken the burner fixing screws and draw the assembly off the emitter tube. 2319 Laurelbrook Street, Raleigh, NC 27604 · (800) 542-7221 · FAX (919) 834-4526 · -16 E. BURNER NER/ELECTRODE ASSEMBLY – Inspect the burner/electrode assembly by removing the six screws securing the combustion chamber cover plate to top of control box, taking care not to damage the sealing gasket. Remove the burner head by unscrewing it from the injector taking care not to drop it on the leads of the ignition electrodes. Replace the electrode assembly if it is not in good condition. The assembly is removed by removing the screws which attach it to the bracket on the front wall of the combustion chamber. The assembly is then lifted out of the combustion chamber and the cable disconnected. If the electrode assembly is in good order check the spark electrode gap, this should be .125 inches ±.030 inches. Adjust the gap if necessary by bending the ground rod. Ensure the electrical connections are secure. Inspect the injector and clean as necessary using a soft bristle brush. To remove or replace the injector, with the burner head removed, unscrew the injector from its carrier using a wrench, on the hexagon portion of its body. When replacing the injector ensure that it is fully tightened in its carrier. (TIGHTEN SNUG --DO NOT OVERTIGHTEN) Replace the burner head. Replace the combustion chamber top cover, renewing the rubber sealing gasket if this is not in good condition. Inspect the burner fresh air inlet duct if fitted and ensure that it is free of any blockage or obstruction. Inspect the air inlet terminal and ensure this is not liable to obstruction. Recheck the heater by following the procedure for check out and start up, taking care to check that the burner gas pressure is correctly set, and that the vacuum switch and flame safeguard equipment function correctly. F. AUXILIARY CONTROLS – Check that auxiliary controls such as room thermostats, time switches, etc. function correctly and are set to operate at the desired temperatures. Ensure that the user is aware of the functions of the auxiliary controls and their correct settings. For most efficient operation of the heating system the time switch, if fitted, should be set to switch on normally between . hour and 1 hour before commencement of occupancy of the building depending on local conditions. The correct setting of the room thermostat can only be determined byexperience in cold weather when it should be set to shut off the heaters when a comfortable level of warmth has been achieved. This setting will normally be several degrees below that which would be required with a convective heating system. 2319 Laurelbrook Street, Raleigh, NC 27604 · (800) 542-7221 · FAX (919) 834-4526 · -17 B. 3 REPLACEMENT OF COMPONENTS WARNING: TURN OFF GAS AND ELECTRICAL SUPPLIES BEFORE STARTING REPAIR WORK. A. TO REPLACE ANY COMPONENTS IN THE BURNER/CONTROL ASSEMBLY – This assembly should be removed from the heater by disconnecting the gas and electrical supplies (also the fresh air intake duct if used). Loosen the bolts and slide the burner/control assembly from the emitter tube. B. TO REPLACE ELECTRODE ASSEMBLY – Remove top cover of combustion chamber by removing six (6) screws. Remove the screws securing the electrode assembly and pull off the electrode cable connector. Reconnect the cable connector to the new electrode assembly and replace the assembly. Replace the cover plate and gasket. Spark electrode gap .125 ±.030”. C. TO REPLACE THE BURNER HEAD – Remove combustion chamber cover as in section B above. Unscrew burner head from injector. Screw on new burner head. Replace combustion chamber cover. D. TO REPLACE THE INJECTOR – SEE PAGE 17 E. TO REPLACE COMBINATION GAS VALVE – Remove combustion chamber cover as in paragraph B. Remove control housing cover. Remove burner head as in paragraph C. Unscrew the gas supply pipe entering the combination gas valve. Remove the electrical connections from the valve. Remove the two (2) screws holding the gas valve. The combination gas valve can now be removed. Replace any defective component and reassemble using approved p...

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