Electric motor connection diagram:
In the diagram of the connection of the electric motor of the heater fan and the elements of the rear window heating: 1 - mounting block; 2 – ignition switch; 3 – ignition switch unloading relay; 4 – heater motor switch; 5 – additional resistor; 6 – heater electric motor; 7 – rear window heating switch with indicator lamp; 8 – rear window heating element; K7 – rear window heating relay
An additional resistor is used to obtain a low rotation speed. It is secured with a screw on the left side of the heater radiator casing. The resistor includes two spirals: one with a resistance of 0.23 Ohm, the second with a resistance of 0.82 Ohm. When both spirals are included in the electric motor power supply circuit, the first fan rotation speed is provided; if a 0.23 Ohm resistance coil is turned on — the second speed. When the electric motor is turned on without a resistor, the fan rotor rotates at the maximum — the third speed (4100 min⁻¹).
Data for checking the heater fan electric motor Shaft rotation speed when the electric motor is loaded by the impeller (corresponds to a shaft load of 0.216 N·m (0.022 kgf·m)) at a voltage of 12 V and a temperature of (25±10)°C, min⁻¹…..4100±200.
Current consumption at the specified load and rotation speed, A, no more than…..14.