Nortek Reznor UDSA-4E 011, Установка, пусконаладка, обслуживание

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I-UDSA-UK (02-19) PN 06 00116 UDSA R3, page 20
Figure 17 : Control relay Brahma TC340A
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, the fan guard, and
blades. Use care when cleaning the fan blades to prevent
causing misalignment or imbalance. Check that the hub of the
fan blades is secure 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 disconnect 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).
Flame sensor: See 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 re-
quires 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
Troubleshooting Flow Chart in section 25.
FAN MOTORS
18
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 for types 011, 015, and 020.
Position the assembly on the heater and attach the fan
guard.
Rotate the fan blade by hand to check for adequate clear-
ance. 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 dia-
gram 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.
Fan
m
ot
or
Fan blade
Type 011 015 020
mm 23 50 49
Dimension A