Nanjing Iveco A40.10 light vehicle Shanghai air conditioning system circuit line circuit diagram

(6) Nanjing Iveco A40.10 light-duty vehicle Shanghai air-conditioning circuit.

In the KQZN101 air conditioning system used in the A40.10 light vehicle (Fig. 26), there are 4 axial flow condenser fans M1, M2, M3, M4, 3 evaporator fans M5, M6, M7 (double-axis centrifugal type) ), the panel is also equipped with air volume switch SA1, LED indicator, alarm light and temperature control switch WKQ and manual switch SA2. To facilitate the reading of the figure, it will be simplified as shown in Fig. 27 as shown in Fig. 27.

When the air volume switch SA1 is closed, the temperature controller WKQ can be put into operation. If the system is to be cooled, it is not subject to temperature control, and the manual switch SA2 can be closed, then the condenser relays K1 and K2 are closed, and the condenser fan M1 is closed. M2, M3, M4 and compressor LH are put into operation, and the cooling indicator COOL is on.

In the case of I block, the relays K8 and K9 are connected, and the evaporator fans M5 and M6 are connected in series, withstand DC12V voltage, work at low speed, and the evaporator fan M7 works.

In the second gear, the relays K1O and K7 are closed, the common contacts are open, the normally open contacts are closed, the M5 and M6 directly bear the voltage of 12V, and the two fans are connected in parallel and work at medium speed. K8 and K9 are disconnected. The evaporating fan M7 stops working.

When the III gear is used, the air volume switch integrates the functions of I and II gears, then K7 and K1O pull-in, M5, M6, M7 evaporator fan high-speed relays. K8 and K9 are also sucked together, and the entire refrigeration system motor runs at high speed and accelerates cooling.

As shown in Fig. 27, in the temperature control circuit and the protection monitoring circuit, the power indicator light POWER is turned on when the air conditioner switch is turned on. The cooling indicator COOL is illuminated when the thermostat WKQ or manual switch SA2 is turned on. High-voltage fault indicator light (light-emitting diode) HP, when the switch H (high voltage) is disconnected due to excessive cooling system pressure, HP lower end loses high potential, and R4 is grounded, HP lights up and alarms. At the same time, the relays K1 and K2 are disconnected, and the condenser motors M1, M2, M3, M4 and the compressor LH are all stopped. Low-voltage fault indicator LP, when the low-voltage switch L is disconnected, the M-switch is also disconnected, the negative terminal of the LED LP loses a high level, and the step-down resistor R3 is grounded, LP is lit, indicating that the low-voltage pipeline is faulty, and at the same time It will also cause the K1 and K2 relays to disconnect M1, M2, M3, M4 and LH and stop working.