Duke WB304-NAT Service Manual - Page 8
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Gas Operated Foodwarmers
Safety Valve Replacement
Figure 5.
Safety Valve
General
Safety valves are mounted between the gas control
valve and the burner (see Figure 5).
1. Shut off the gas supply.
2. Remove the galvanized burner liner.
3. Remove the screws the hold the bottom cover
in place.
4. Disconnect gas line and pilot tube on the inlet
side of safety valve.
5. Disconnect pilot tube and gas line on the outlet
side of the safety valve.
6. Disconnect the thermocouple from the safety
valve.
CAUTION: The thermocouple line is fragile.
Do not kink it.
7. Remove the safety valve from the unit.
8. Install the new safety valve, mounting screws
(if used) and thermocouple.
Note: Do not kink the thermocouple.
9. Apply gas approved thread sealer to all gas
and pilot tube fittings.
10. Check for leaks.
8
11. Install the bottom cover.
12. Connect the unit to its gas supply
13. Light the pilot light.
14. Replace the galvanized burner liner.
15. Verify that the burner lights properly.
Thermocouple Replacement
Figure 6.
Thermocouple
General
The thermocouple is connected to the safety
valve at one end. The probe end is near the pilot
burner.
1. Shut off the gas supply.
2. Remove the galvanized burner liner from the
pan.
3. Remove the screws the hold the bottom cover
in place.
4. Unscrew the thermocouple from the safety
valve.
5. Remove the probe end from the burner
area.
6. Replace the thermocouple.
CAUTION: The thermocouple line is fragile.
Do not kink it.
7. Perform leak test at safety valve fitting.
8. Install the bottom cover.
9. Turn on the gas supply.