1307SDH_RDH--EN,page 27/32
12.6 Fan motor, fan
The fan motor is equipped with thermal overload
protection of the automatic reset type. Should the motor
fail to run, it may be because of improper voltage
characteristics. Make certain that the correct voltage is
available at the motor.
Remove dirt and grease from the motor and the fan. Use
care when cleaning the fan to prevent imbalance.
12.7 Venter motor & wheel
See figures 30 & 31
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 reassembling and installing the
replacement parts.
1. Turn off the gas and disconnect the electric power.
2. Open the control compartment access door.
3. Disconnect the three venter motor wires at the
terminal and ground screw .
4. Holding the motor, remove the screws that attach
the motor plate to the venter housing. Remove the
motor and wheel assembly from the heater.
5. Reassemble with the replacement venter motor and
wheel assembly.
6. Follow the wiring diagram to properly connect the
wires.
7. Restore power to the heater and turn on the gas.
Light, following the instructions on the lighting
instruction plate. Check for proper operation. Close
the access door.
Figure 30 : AACO motor
types SDH/RDH 025→ 055
Figure 31 : AACO Venter assembly
types SDH/RDH 073 & 100
12.8 Operating gas valve
See figure 32
The main operating quick opening gas valve is powered
through the thermostat and safety controls. The main
control valve is of the diaphragm type providing
regulated gas flow and is adjusted at the factory. The
gas valve requires no field maintenance except careful
removal of external dirt accumulation and checking of
wiring connections. Instructions for testing pressure
settings are in sections 9 and 10.
Figure 32 : Gas valve, (nat.gas))
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