Haier HP200M3 Installation And Service Manual page 38

3. Making the vacuum & Gas Charging:
Bleeding from the circuit should take place with a vacuum pump and pressure gauge assembly
suitable for R134a.
Make sure the vacuum pump is full of oil up to the level indicated by the oil gauge.
1. Connect the manometer on the low pressure service valve of heat pump, and connect the
refrigerant cylinder to the other side the manometer.
2. Connect the vacuum pump to the center tap of the manometer.
3. After opened the valves of the vacuum pump, start it and let it run. Create a vacuum for about
20 / 25 minutes;
4. Close the valves of the pump and shut off. Verify that the gauge needle does not move for
about 5 minutes.
5. Disconnect the vacuum pump;
6. Open the container of the refrigerant then open the main valve cap pressure gauge and adjust
the needle valve until you hear the coolant leak, and release the pin and close the valve of the
pipe;
7. Keep under control the weight of the refrigerant tank through the electronic scale;
8. Open the ball valve and to flow the refrigerant gradually;
9. After reaching the mass of gas to be loaded close the tap(0.9kg);
10. Remove the manometer and charging hose from the valve;
11. turn the product in heat pump mode with the detector and check for leaks of refrigerant;
12. Remove the container from the manifold and replace all the equipment.
Service valve
connect the
refrigerant cylinder
38
connect the
Service valve
manometer
Connect the
vacuum pump