The diagram of switching on the electric motor of the heater can be found in fig. 150 at the beginning of the book. The electric motor 27 is turned on by the switch 38 located on the instrument panel. When an additional resistor 28 is connected to the power supply circuit of the electric motor of the heater, the armature shaft rotates at a reduced frequency. The resistor is secured with two spring washers in the heater fan housing. Resistor resistance 1.5 ohm at 20°C.
The data for checking the electric motor is as follows:
- Rated voltage, V - 12
- Rated power, W - 20
- Frequency of rotation of the armature shaft with an impeller at rated power, rpm — 3000±150
- Current consumption at rated power, A - 4.5
- Low frequency of rotation of the armature shaft with an impeller, rpm — 2200±150
- Consumed current at armature speed 2200 rpm, A - 2.7
A defective motor is usually recommended to be replaced. The only possible repair is cleaning the collector. To disassemble the electric motor, it is necessary to unscrew the screws securing the cover and remove it. Then remove the lock washer from the armature shaft and remove the armature from the housing. Assembly is carried out in reverse order.
Checking the technical condition of the electric motor and its malfunctions are similar to those described above for the wiper motor.