Reznor UDAS Unit Installation Manual User Manual

Page 33

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Page 33

FIGURE 23 - Venter

Wheel Position on

Shaft

10.2.6 Venter Motor

and Wheel

Replacement Instructions

5. Reconnect the fan motor wires according to the wiring diagram and close the

access panel.

6. Restore power to the heater and turn on the gas. Light, following the instructions

on the lighting instruction plate. Check for proper operation.

10.2.7 Operating Gas

Valve

Carefully remove external dirt accumulation and check wiring connections.

WARNING

The operating valve is the prime safety shutoff. All gas supply

lines must be free of dirt or scale before connecting to the unit to

ensure positive closure. See Hazard Levels, page 2.

The combination gas valve must be checked annually to ensure that the valve is shut-

ting off gas flow completely.
Instructions:
1) Locate the 1/8” NPT pressure tap on the combination valve. (See

FIGURE 24,

page 34.

7. Follow the wiring diagram to connect the venter wires.

8. Sizes 30 and 45 - Reconnect the gas supply at the union outside of the cabinet.

Leak test the connection with leak detecting solution.

9. Replace the access panel. Restore power to the heater and turn on the gas.

Light, following the instructions on the lighting instruction plate. Check for proper

operation.

Remove dirt and grease from the motor casing, the venter housing, and the venter

wheel. Venter motor bearings are permanently lubricated. Follow these instructions for

replacement of the venter motor and wheel assembly. Keep all hardware removed to

be used in re-assembling and installing the replacement parts.
1. Turn off the gas and disconnect the electric power.

2. Open the burner/control compartment access panel.

3. Disconnect the three venter motor wires at the DSI control, capacitor wires at the

capacitor (if applicable), and ground screw (located on the control panel).

4. Sizes 30 and 45 - Disconnect the gas train and move it out of the way. Disconnect

the gas supply at the union outside of the cabinet. At the gas valve, mark and

disconnect the wires. Carefully remove the burner orifice and orifice adapter

locking nut. Slide the orifice adapter out through the bracket on the burner pushing

the gas train to the right. This will move the gas train out of the way.

5. Holding the venter motor, remove the three or four screws that attach the venter

motor mounting plate to the venter housing. Remove the motor and wheel

assembly from the heater.

6. Re-assemble with the replacement venter motor and wheel assembly. See

FIGURE 23.

150-175

30-125

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