Checking the refrigerant level through the sight glass
Start the engine.
Turn on the air conditioner, set the maximum air cooling mode.
Keep the engine speed at 1500 rpm-1.
Check the refrigerant level through the sight glass.
Attention! Use a pressure reducing valve.
Attention! Contact a refrigerant charging station as the user cannot correctly assess the amount of refrigerant in the system through the sight glass.
Checking the electromagnetic clutch
Disconnect the solenoid clutch connector from the clutch itself.
Connect (+) battery to the electromagnetic clutch connector.
If the electromagnetic clutch is working, then you should hear «click» If there is no contact between the drive pulley and the rotor («clicks»), this indicates a malfunction.
Checking the Dual Pressure Sensor
Disconnect the dual pressure sensor connector and connect the side high/low pressure terminals located on the wiring harness side as shown.
Connect the gauge manifold to the service valve on the high pressure side of the refrigerant line.
When the high/low side of the dual pressure transmitter is under operating pressure, the measured resistance should not exceed 2 ohms. If the circuit is open, replace the sensor.
Refueling
With the handles turned back to failure (valve closed), install an adapter valve on the low pressure side of the gauge manifold.
Connect charging hose (of blue color) to the adapter valve.
Connect Quick Coupling (for low pressure) to charging hose (of blue color).
Attention! Use only attachments and tools that are compatible with R134a refrigerant.
Attention! To install a quick coupling, press down on the coupling section and also run your hand along the hose to be connected to ensure there are no kinks.
Connect Quick Coupling (for low pressure) to the low pressure service valve.
Attention! The low pressure service valve must be connected to a flexible supply hose.
Close the high and low pressure valves on the gauge manifold.
Attention! Remember to connect the vacuum pump power connector to the vacuum pump adapter, and then connect the adapter with the power connector to a 100V source.
Install the vacuum pump adapter to the vacuum pump.
Connect charging hose (yellow color) to the R-134a refrigerant connection port of the vacuum pump adapter.
Tighten the adapter valve handle (valve open).
Open the low pressure gauge manifold valve.
Set the vacuum pump switch to on («ON») position.
Attention! Even when set to on («ON») position of the vacuum pump switch, the vacuum pump will not work due to the connection made in step 6.
Attention! Do not use the air conditioning compressor when removing refrigerant.
Turn the vacuum pump adapter switch towards R134a to start the vacuum pump.
The removal of the refrigerant occurs at a rarefaction of not more than 100 kPa (takes about 10 min).
Attention! Do not operate the A/C compressor under vacuum as this will damage it.
Fully loosen the adapter valve (valve closed), turn off the vacuum pump with the switch. Then leave everything for five minutes.
Check system for leaks (vacuum value should not decrease).
Connect the valve to the charging cylinder (with refrigerant) with fully released valve handle (valve closed).
Completely unscrew the valve adapter (valve closed), remove it from the measuring manifold and replace it with a charging cylinder.
Tighten the charging valve handle (valve closed) to pierce the charging bottle.
Attention! If the charging cylinder is turned upside down, liquid refrigerant may flow into the compressor and be damaged by the liquid pressure. Hold the charging cylinder upright (without overturning) to ensure that the refrigerant charges the system in the gaseous state.
Turn the charging valve handle back (valve open) and tighten the adapter valve knob (valve open) to charge the system with refrigerant.
If no refrigerant fills the system, turn the adapter valve back as far as it will go (valve closed).
Check for gas leaks with a leak detector. If there are leaks, tighten the connections, and repeat the procedure for filling the system with refrigerant from step (11).
Attention! A leak detector for R-134a refrigerant must be used.
Start the engine.
Turn on the air conditioner, set the minimum temperature mode (MAX. COOL).
Keep the engine speed at 1,500 rpm-1.
Attention! If the charging cylinder is turned upside down, liquid refrigerant may flow into the compressor and damage it under liquid pressure. Hold the charging cylinder upright (without overturning) to ensure that the refrigerant charges the system in the gaseous state.
Tighten the adapter valve handle (valve open) to fill the system with the required amount of refrigerant.
After filling the system with refrigerant, turn the adapter valve back until it stops (valve closed).
Tighten the charging valve handle (valve closed). Disconnect the quick connector (for low pressure) from the low pressure service valve.
Disconnect the charging bottle.
Attention! If the charging cylinder still contains some refrigerant, close the charging valve and adapter valve tightly to save the refrigerant for the next charge.