Haier AB36NACBEA Service Manual page 45

d. Refrigerant piping
(1) Outline piping
(2) Piping size
36 series
Model
Gas piping
19.05(3/4")x1.0mm 19.05(3/4")x1.0mm
9.52(3/8")x0.8mm 9.52(3/8")x0.8mm
Liquid piping
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 50m (for 36,42 series)
Vertical height difference: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
ofanticlockwise 90 degree.
After 6 seconds later, close the 2-way valve and
malethe inspection of gas leakage.
INSTALLATION INSTRUCTIONS
Flare connection
Indoor
unit
42 series
19.05(3/4")x1.0mm
9.52(3/8")x0.8mm
2 Open
Close
3
Check joint
Service valve
Gas pipe
Outdoor
unit
Liquid
pipe
Flare connection
2-way valve
3-way valve
Gaugemanifold
Vacuum pump
2-way valve
3-way valve
Service port
Open
90•
4 90• for 6 sec.
90•
For series 36,42
For series 36,42