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Remove the gas control valve rod by removing the cotter pin. Disconnect both
piezoelectric igniter cables from their connections to the heat exchanger. Remove the
electrode ceramic. Remove the two (2) gas lines connecting the gas control valve to the
pilot and main burner from both ends. Remove the thermocouple from both ends.
Remove the gas control valve grip (one (1) screw) and remove the valve. Remove the gas
control valve support (two (2) screws). Remove the sheet metal valve protector
(two (2) screws). Remove the main burner fixing nut on the left of the heat exchanger.
Remove the main burner support (four (4) screws). Take the main burner assembly (with
pilot attached) out of the heat exchanger. Clean the pilot and main burner completely as
necessary with a soft bristled brush.
Check the main burner gasket , If it is damaged or worn replace with a new gasket
available from your dealer. (the gasket part number can be found in the exploded parts
view at the end of this manual) After cleaning, reinstall the main burner module in the
reverse order of the directions above.
Step 7 Replace the heater on the wall mounting plate. Take extreme care to ensure that
the EXHAUST pipe is firmly engaged with the vent outlet at the rear of the heater.
Be sure that the pipe remains engaged in its position in the vent cap. The air inlet pipe
must slide over its appropriate opening. Use the hexagonal nuts of step 3 above to firmly
re-attach the unit back on the wall mounting plate.
Step 8 Reconnect the gas supply. Perform the leak test procedure found in the section of
this manual titled "Check for Gas Leaks" on page 14.
Step 9 Verify Proper Operation After Servicing: Place the unit back into operation
following the procedures found on the hanging tag behind the unit and/or in Figure 10
in this manual. Check all connections from the Gas Control Assembly to the pilot and main
burner with soapy water solution. Bubbles on any of the joints indicate a leak is present
and must be repaired. Turn OFF the gas to the unit when performing repairs to the gas
piping system. Check to make sure that the spark ignition (piezoelectric igniter) lights
the pilot.
Step 10 While the main burner is ON, check the flames to see that they are burning a
clean blue color.
Note: After cleaning, the first few minutes of heater operation will probably have some
yellowish flying traces in the flame due to the burning of particles left behind during the
cleaning operation.
Liquid propane has some evidence of yellowing in the tips of the flame. The main burner
and pilot flames can be observed through the heat exchanger front glass on
Comfort View units or through the pilot viewing window located at the top right front of
the heat exchanger on Calorama units. See Figure 11 below for an approximation of the
correct flame patterns. If your unit is not burning cleanly, turn it OFF. Clean or change
injectors following the directions below.
CONDUCT ALL LEAK TESTING ONLY IN A WELL VENTILATED AREA.
THE AREA MUST BE FREE OF ACCUMULATED GAS. BE SURE YOU DO NOT SMELL ANY
GAS BEFORE PROCEDING TO OPERATE THE UNIT.