Thomas & Betts LDAP 1200 Heat Section Venter Motor and Wheel cont’d, Fan Motors, Fan Blades

33.Heat Section Venter Motor and Wheel (cont’d)

Replacement Instructions

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

4.Holding the venter motor, remove the six screws that attach the venter motor mounting plate to the venter housing. Remove the motor and wheel assembly from the heater.

FIGURE 26 - Venter Wheel Position on Shaft - applies to all heat section venter assemblies

7/16” (11mm) inside

5.Re-assemble with the replacement venter motor and wheel assembly. See FIGURE 26.

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

7.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 opera- tion.

34. Main Venter Motor and Wheel (Models 800 and 1200 only)

Venter Motor

The main venter motor and wheel is located on the top of the first heat section of a Model LDAP 800 and 1200. The vent system attaches to the collar on the top of the main venter housing.

Remove dirt and grease from the motor casing, the venter housing, and the venter wheel. Venter motor bearings are permanently lubricated.

Follow the instructions in Paragraph 33 for replacement of the venter motor and wheel assembly. Keep all hardware removed to be used in re-assembling and installing the replacement parts. See FIGURE 27 for venter wheel and motor spacing.

									1-1/4” (32mm)
								Wheel		Motor Wire
						Main Combustion				and Cable Assy
						Air Pressure			Main Venter
		Venter Housing				Switch			Motor
										Screw
FIGURE 27- Venter Motor										Flat Washer
and Wheel Spacing on										Hex Nut
Main Venter (Size 800 and
1200)									Exhauster Motor Base Assy
35. Fan Motor(s),
							Remove dirt and grease from each motor, fan guard, and blades. Use care when
		Fan Blades,					cleaning the fan blades to prevent causing misalignment or imbalance. Check that the
							hub of the fan blades is secure to the shaft.
		and Guard(s)					Follow these instructions for replacement of the fan guard, fan motor and/or fan blades.
FIGURE 28- Fan Blade							Repeat the procedure for each heater section.
							1. If the heater is installed, turn off the gas and disconnect the electric power.
Position on the Shaft
							2. Open the access door and disconnect the fan motor wires, capacitor wires at the
				3”
	Fan						capacitor, and ground screw.
	Blade		(76mm)				3. Remove the assembled parts (the fan guard, the motor and the fan blade).
					Fan		4. Disassemble and replace whatever parts are needed and reassemble using
					Motor		whatever part(s) are being replaced and the original parts.
							Be sure the fan blade is in the proper position on the shaft; refer to the illustration
							in FIGURE 28.
							Position the assembly on the heater. Attach the fan guard.
							Rotate the fan blade to check for adequate clearance. If adjustment is required,
							loosen the mounting screws, re-position the fan guard, and tighten the screws.

Form RZ-NA-I-LDAP, P/N 207733 (Rev 2), Page 36