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16009-1-0504 Page 15
APPLIANCE MAINTENANCE
Removing Pilot/Thermocouple From Main Burner
Assembly
Attention: The thermocouple CAN NOT be replaced as an
individual item. You must order a new pilot when replacing
thermocouple.
1. Turn OFF gas supply to the heater.
2. Turn OFF electrical supply to the heater if optional blower is
installed in heater.
3. Remove lower louver from casing assembly (2 screws).
4. Remove reflector from casing assembly (2 screws).
5. Disconnect pilot tubing from pilot (see Figure 14, Page 14).
Grasp nut A with a wrench when removing nut B with a
second wrench.
6. Remove pilot from pilot bracket (2 screws).
7. Remove thermocouple lead from gas valve.
8. As parts are being replaced in reverse order, check for gas
leaks at all gas connections before lower louver is replaced
onto casing assembly.
Removing Main Burner Orifice(s) From
Main Burner Assembly
1. Turn OFF gas supply to the heater.
2. Turn OFF electrical supply to the heater if optional blower is
installed in heater.
3. Remove lower louver from casing assembly (2 screws).
4. Remove reflector from casing assembly (2 screws).
5. Remove pilot bracket from main burner assembly (2 screws).
6. Pivot pilot bracket with attached pilot away from main burner
assembly (do not damage pilot tubing).
7. Disconnect supply tubing from orifice holder(s).
8. Remove orifice holder from venturi of main burner assembly
(1 screw for each orifice holder).
9. Remove main burner orifice from orifice holder. Attention:
The number stamped on the main burner orifice is a
millimeter diameter.
10.As parts are being replaced in reverse order, check for gas
leaks at all gas connections before lower louver is replaced
onto casing assembly.
Removing Gas Valve From Casing Assembly
1. Turn OFF gas supply to the heater.
2. Turn OFF electrical supply to the heater if optional blower is
installed in heater.
3. Remove lower louver from casing assembly (2 screws).
4. Remove reflector from casing assembly (2 screws).
5. Remove upper louver from casing assembly (2 screws).
6. If installed, remove optional blower assembly (4 screws).
7. Disconnect inlet supply tubing, outlet supply tubing, pilot
supply tubing and thermocouple lead from gas valve.
8. If heater is attached to wall, disconnect gas supply line from
inlet regulator.
9. Remove heater from wall.
10. Remove gas valve bracket from casing assembly (4 screws to
be removed are located on casing assembly back).
11. Remove hydraulic thermostat bulb from thermostat bulb clip
located at casing assembly bottom.
12. Remove gas valve from gas valve bracket.
13. As parts are being replaced in reverse order, check for gas
leaks at all gas connections before upper louver, reflector and
lower louver are replaced onto casing assembly.
Removing Main Burner From Casing Assembly
1. Turn OFF gas supply to the heater.
2. Turn OFF electrical supply to the heater if optional blower is
installed in heater.
3. Remove lower louver from casing assembly (2 screws).
4. Remove reflector from casing assembly (2 screws).
5. Disconnect supply tubing from orifice holder(s).
6. Remove pilot bracket from main burner assembly (2 screws).
7. Remove main burner assembly from casing assembly (4
screws).
8. Remove orifice shield from main burner assembly. Attach
orifice shield to new main burner assembly.
9. As parts are being replaced in reverse order, check for gas
leaks at all gas connections before lower louver is replaced
onto casing assembly.
Piezo Pilot Ignitor Instructions
Depressing the ignitor button completely causes a spark to occur
at the pilot.
To light the pilot, it is important that the electrode be 1/8" (3mm)
from the pilot. The spark must occur at the point the pilot flame
hits the thermocouple.
On a new installation with air in the gas line, it is suggested that
a match be used. The match will light the pilot faster than the
piezo under this condition.