1801UDSBD-4E,--EN, Pag. 23/35
Figure 17 - Control relay Brahma TC340A
Flame sensor
- Refer to figure 11a and locate the flame sen
-
sor. Disconnect the wire, remove the screw and the flame
sensor. Clean with an emery cloth..
Control relay
- See figure 17. 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 flame signal of 1.0 microamps (DC) as measured
by a microammeter.
For further information and check out procedure on the direct
spark ignition system, refer to section 12 and the Trouble-
shooting Flow Chart in section 25
.
18
Blower motor
The blower 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 blower
wheel. Use care when cleaning the wheel to prevent causing
misalignment or imbalance.
Follow these instructions for replacement of the direct driven
centrifugal fan.
1. If the heater is installed, turn off the gas and disconnect
the electric power.
2. Open the connection box on the blower and disconnect
the fan motor wires.
3. Remove the blower.
4. Position the new blower on the heater.
5. Reconnect the fan motor wires according to the wiring
diagram and close the connection box on the blower.
6. Restore power to the heater and turn on the gas. Light,
following the instructions on the lighting instruction plate.
Check for proper operation.
Centrifugal fan
19
