Superior AA250 Series, Инструкция по установке, эксплуатации и обслуживанию

Страница: 19 / 26

Series AA250 Page 19 LT252 Oct 2019
Remove the ten (10)
screws here to access
the motor assembly
Remove these two (2)
screws to remove the switch
from the blower housing
Remove these two (2)
screws to access the switch
MOTOR AND FAN ASSEMBLY
1. Disconnect the motor leads from the terminal block. See ELECTRICAL DIAGRAM (page 19) for reference.
Loosen the cable gland on the back of the electrical block and take the motor leads out.
2. Remove ten (10) motor interface plate screws and gently lift the fan and motor assembly from the housing.
3. Loosen the square head set screw on the fan wheel.
4. Pull the fan wheel from the motor shaft. Use a wheel puller if necessary.
5. Remove four (4) nuts securing the motor to the mounting plate
6. Follow instructions in reverse to re-assemble motor. Fan wheel to interface plate clearance must be set to
0.5 inches (13mm). Make sure the set screw of the fan is on the flat of the motor shaft when tightening.
Figure 8 – Motor assembly
AIR PROVING SWITCH
If the air proving switch contacts are closed before the ignition control starts the fan motor, or do not close on a call
for heat after the fan motor starts, ignition will not occur.
1. Remove the two (2) sheet metal screws holding the switch with bracket to blower housing.
2. Remove the assembly by turning the switch so the paddle on the switch arm on side of fan housing
3. Remove the two (2) screws on either side of the switch housing and remove the bottom half of the switch
housing.
4. Inspect the flapper. Ensure that it lifts freely, does not bind, and is free of dust and other debris. If the flapper is
binding, its arm will not engage the air proving switch and ignition will not occur.
Figure 9 – Sail switch assembly