42
Burner Maintenance
1. Verify the unit is off.
2. Inspect the pilot assembly, refer to “Pilot Assembly” on page 26. Replace if required.
3. Inspect the burner plates.
4. Clean the burner plates. Make sure the baffles are secure and attached to the burner.
5. Clean burner with wire brush and make sure the burner ports are free of debris. Refer to Table 12 for
drill size(s) to clear ports. Wipe the burner with a clean rag.
6. After cleaning the system, turn the system. Visually inspect the flame.
Re-Setting of the Unit
If the flame safety control is locked out (alarm light on), reset the unit by:
1. Turn OFF power to the unit.
2. Turn power to the unit back ON.
Emergency Shutdown of Unit
To shutdown the unit in the event of an emergency, do the following:
1. Turn power OFF to the unit from main building disconnect.
2. Turn the external disconnect switch to the OFF position.
3. CLOSE the inlet gas valve located on the heater.
Prolonged Shutdown of the Unit
For prolonged shutdown, the following steps should be done:
1. Turn the external disconnect switch to the OFF position.
2. CLOSE the inlet gas valve located on the heater.
To re-start the unit, the following steps should be done:
1. Turn the external disconnect switch to the ON position.
2. OPEN the inlet gas valve located on the heater.
Table 11 - Filter Quantity Chart
Intake 16” x 20”
76 1
Table 12 - Burner Orifice Drill Size
Orifice Drill Size
Gas Port 1/8”
Air Port 42
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