INSTALLATION MANUAL FOR OUTDOOR UNIT
23
(1) Outline piping
4. Refrigerant piping
(2) Piping size
(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).
(4) Purging method ( the refrigerant is R407C)
90 + 0.5
Outdoor
unit
Service valve
Flare connection
Check joint
Gas pipe
Liquid
pipe
Flare connection
Indoor
unit
Model
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.
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.
36,42 series
24,28 series
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.
To use vacuum pump
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 .
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.
2-way valve
3-way valve
90
Service port
4 90 for 6 sec.
Open
For series 36,42
3
Close
2
Open
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.
Vacuum pump
For series 24,28
3-way valve
2-way valve
Gaugemanifold
Gaugemanifold
Vacuum pump
2-way valve
3-way valve
For series 36,42
3-way valve
2-way valve
Open
90
Service port
90
4 90 for 6 sec.
For series 24,28
90
