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5. Disconnect the brown and yellow wires from the
gas valve.
6. Separate the four-wire connector located near the
combustion air fan (see Fig. 14).
7. Remove the four nuts and washers attaching the
combustion air fan to the top of the burner shroud.
8. Lift the entire venturi assembly off the burner
shroud and place it on a suitable work bench.
9. Remove the six nuts and washers attaching the
combustion air fan to the venturi.
10. Hold the combustion air fan with one hand, and
separate from the venturi.
11. Reverse the previous steps to install a new fan.
Figure 12. Filter Removal
Figure 13. Flow Control Valve
4C. Removing the Venturi Assembly and
Combustion Air Fan
1. Turn off the electrical power and gas supply
outside the heater.
2. Remove the top panel.
3. Disconnect the supply gas pipe from the gas
valve.
Caution
Label all wires prior to disconnection.
Wiring errors can cause improper and
dangerous operation.
4. Disconnect all wires from the venturi pressure
switch.
