Haier HDU-28CM03 User Manual - Page 24

INSTALLATION MANUAL FOR OUTDOOR UNIT 4. Refrigerant piping (1) Outline piping (2) Piping size Flare connection Indoor unit Check joint Gas pipe Service valve Liquid pipe Outdoor unit Flare connection Model 36,42 series 24,28 series 90 + 0.5 Gas piping Liquid piping 19.05(3/4")x1.0mm 9.52(3/8")x0.8mm 15.88(5/8")x1.0mm 9.52(3/8")x0.8mm Install the removed flared nuts to the pipes to be connected, then flare the pipes. (3) Limitations for one way piping length and vertical height difference. One way piping length: less than 30m (for 24,28 series). less than 50m (for 36,42 series). Vertical height difference: Less than 15m (for 24,28 series). less than 30m (for 36,42 series). Precautions for refrigerant piping Do not twist or crush piping. Be sure that no dust is mixed in piping. Bend piping with as wide angle as possible. Keep insulating both gas and liquid piping. Check flare-connected area for gas leakage. (4) Purging method ( the refrigerant is R407C) To use vacuum pump 1 Detach the service port's cap of 3-way valve, the valve rod's cap for 2-way valve and 3-way's, connect the service port into the projection of charge hose (low) for gaugemanifold. Then connect the projection of charge hose (center) for gaugemanifold into vacuum pump. 2 Open the handle at low in gaugemanifold, operate vacuum pump. If the scale-moves of gause (low) reach vacuum condition in a moment, check 1 again. 3 Vacuumize for over 15min. And check the level gauge which should read -0.1 MPa (-76 cm Hg) at low pressure side. After the completion of vacuumizing, close the handle 'Lo' in gaugemanifold and stop the operation of the vacuum pump. Check the condition of the scale and hold it for 1-2min. If the scale-moves back in spite of tightening, make flaring work again, the return to the beginning of 3 . 4 Open the valve rod for the 2-way valve to and angle of anticlockwise 90 degree. After 6 seconds later, close the 2-way valve and male the inspection of gas leakage. 2 Open 3 Close 23 2-way valve 3-way valve Gaugemanifold For series 24,28 Vacuum pump 2-way valve 3-way valve Gaugemanifold For series 36,42 Vacuum pump 2-way valve 3-way valve For series 24,28 Open Service port 90 90 4 90 for 6 sec. 2-way valve 3-way valve Open 90 90 Service port 4 90 for 6 sec. For series 36,42