2.
Insert the ventilating air motor into the motor bracket assembly; slide the blower wheel on the end of the motor shaft and rotate it until the set screw is aligned with the flat side of the motor shaft. Tighten the set screw just tight enough to hold it at this time.
3.
Attach the capacitor and leads assembly to the motor bracket with screw and lock washer. Make sure a good electrical ground connection is made at this point. Install ground bracket and three new fasteners.
4.
Insert this assembly into the blower housing.
5.
Make sure all wires are routed and grommeted as they were prior to disassembly and then secure the assembly in the housing with three screws.
6.
The motor should be positioned in the bracket to locate the blower wheel properly in the blower housing. The blower wheel should be positioned so it will rotate freely and just clear the contoured spill plate in the blower housing. Tighten the Allen-head set screw and spin the blower wheel by hand for a clearance check. Then apply the appropriate voltage to run the motor as a final clearance check.
7.
Attach the inlet adapter to the end of the blower housing with three screws and lock washers.
8.
Place a new asbestos gasket in position on the exhaust outlet; spring the jacket assembly open at the seam and insert the combustion tube assembly carefully into the jacket. Exercise care to clear the pressure switch tube in the exhaust outlet and see that the asbestos gasket is properly located. Close the gap on the jacket assembly and install screws to secure it at the seam. (Solenoid lead wire is grounded under one of these screws. See notations made during disassembly.) Make sure the seam is in good condition and a tight fit is effected.
9.
Install cable straps at locations noted during disassembly.
— CAUTION —
THE SPRAY NOZZLE HAS A SLIGHT PROTRUSION ON THE NOZZLE FACE. IF THIS AREA HAS BEEN STRUCK BY ANY OBJECT WHICH WOULD MAKE A DENT OR DESTROY THE ORIGINAL CONTOUR, THE NOZZLE MUST BE REPLACED.
10. Remove the spray nozzle from the polyethylene bag. Screw the nozzle into the nozzle holder and tighten to 75-100 inch-pounds. It is very important to torque the nozzle to this value as incorrect tightening could cause improper heater operation and nozzle “drool.”
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11.
Install a new gasket and the combustion head in the combustion tube and secure with the six screws.
12.
Insert the fitting on end of nozzle fuel tube through the opening in jacket and attach the nozzle holder to the combustion head assembly with the two screws. It may be necessary to place a slight bend in the shrouded fuel tube to permit alignment of screw holes. Be sure to use a new gasket.
13.
Using a new spark plug gasket, install the spark plug and tighten to a torque of 28 foot-pounds. Install the grommet in the jacket around the spark plug.
14.
Install the ignition assembly on the jacket assembly with the four screws. Connect the high voltage lead to the spark plug and tighten it to 20 foot-pounds.
15.
Attach the overheat limit switch and two spacer gaskets to the jacket assembly with the two screws. Tighten the screws securely.
16.
Attach the cycling switch to the jacket assembly with the two screws.
17.
Place the terminal strip insulation in position on the jacket, followed by the terminal strip. Secure both parts by installing the two screws.
18.
Center the fuel fitting in jacket opening. Position the fuel fitting shroud gasket, washer and shroud, then install the nut finger tight. Insert a 3/4 inch open-end wrench inside the jacket and hold the fuel-tube fitting while tightening the nut with a 3/4 inch deep socket. Install the fuel solenoid elbow and solenoid. Avoid twisting or damaging lead. Install wires through grommet in lower shroud.
19.
Rotate the combustion air switch onto the threaded fitting on the combustion air tube and tighten it firmly.
20.
Install grommet over pressure switch line. Connect the tube to the elbow fitting on the combustion air pressure switch.
21.
Install the wiring harness and connect all wire leads to their respective terminals. (Refer to the wiring diagram, Figure 21-7) Place the grommet (refer to Figure 21-18) in position in the jacket, locate the ventilating air blower at the end of the jacket. Thread the quick-disconnect on the motor leads through the grommet and connect it to the mating connector on the wiring harness.
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