Haier AB242ACBEA Service Manual page 22

4. Refrigerant piping
(1) Outline piping
(2) Piping size
Model 14,18 series
Gas piping
15.88(5/8")x1.0mm
Liquid piping 6.35(1/4")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 15m (for 14,18 series), less than 30m (for 24,28 series),
less than 50m (for 36,42 series).
Vertical height difference: Less than 5m (for 14,18 series), 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
ofanticlockwise 90 degree.
After 6 seconds later, close the 2-way valve and
malethe inspection of gas leakage.
24,28 series 36,42 series
15.88(5/8")x1.0mm 19.05(3/4")x1.0mm
9.52(3/8")x0.8mm 9.52(3/8")x0.8mm
2 Open
3 Close
Check joint
Flare connection
Gas pipe
Indoor
unit
Liquid
pipe
Flare connection
Service valve
Outdoor
unit
2-way valve
3-way valve
For series 24,28
Gaugemanifold
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
Service port
Open
90•
4 90• for 6 sec.
90•
For series 36,42