1104UESAGBEN, page 26/31
Figure 23
Control relay
Control relay :
See
fi
gure 23. The electronic burner relay monitors the operation of the heater
including ignition. Do not open the control relay. Each heating season check the lead wires for
insulation deterioration and good connections.
Proper operation of the direct spark ignition system requires a minimum
fl
ame signal of 1.0
microamps (DC) as measured by a microam meter.
For further information and check out procedure on the direct spark ignition system, refer to
section 9 and the troubleshooting
fl
ow chart in section 10.3.
11.2.5 Fan motors, fan blades & guard
Remove dirt and grease from the motor, the fan
guard, and blades. Use care when cleaning the fan
blades to prevent causing misalignment or imbal-
ance. Check that the hub of the fan blades is se-
cure to the shaft.
Follow these instructions for replacement of the fan
guard, fan motor and/or fan blades.
1. If the heater is installed, turn off the gas and dis-
connect the electric power.
2. Open the access door and disconnect the fan
motor wires.
3. Remove the fan assembly (fan guard, motor and
fan blade).
4. Disassemble and replace parts as needed, then reassemble.
Be sure the fan blade is in the proper position on the shaft; refer to the illustration and table in
fi
gure 24.
Position the assembly on the heater and attach the fan guard.
Rotate the fan blade by hand to check for adequate clearance. If adjustment is required, loosen
the mounting screws, reposition the fan guard, and tighten the screws. Rotate the fan blade
and recheck for adequate clearance. Repeat this procedure until the assembly is positioned
properly.
5. Reconnect the fan motor wires according to the wiring diagram and close the
access door.
6. Restore power to the heater and turn on the gas. Light, following the instructions
on the lighting instruction plate. Check for proper operation.
ventilator-
wiel
ventilator-
motor
ventilator-
wiel
ventilator-
motor
Dimensions A
Size
035
055
083
102
mm
87
87
89
89
Figure 24
Fan blade position on
motor shaft
