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7. Pipe Vacuumizing
Installation Precedure
23
Use vacuum pump to evacuate the air. Never use the refrigerant for the evacuation.
Drain off the nitrogen gas after the leak test and then connect the vacuum pump as shown in the figure below.
The vacuum pumping must be done from both the liquid and gas inlets.
T
o the unit
To the unit
(Gas side) three-way valve
(Gas side) access hole
To the gauge distributor
(Liquid side)access hole
(Liquid side)three-way valve
Field tube
installation
Field tube
installation
Detailed diagram of the three-way valve
Three-way valve fully closed
liquid side
6.4Copper pipe
Vacuum pump
Gauge distributor
High-pressure gaugeLow-pressure gauge
Three-way valve fully closed
(gas side)
Solder
joint
Solder joint
Tightly
closed
Indoor unit
Indoor Outdoor
Access hole
Solder joint
Tightly
closed
Tightly
closed
Access hole
Outdoor unit
P
Use a vacuum pump with high degree of vacuum(below-755mmHg) and large volume displacement (above 40L/min).
The pumping time depends on the length of the connecting pipe. Generally, it takes about 2-3 hours. Make sure that the Y-shaped
valves on both the gas and liquid sides are closed before pumping.
If the vacuum can no reach-755mmHg within 2 hours, continue pumping for another 1 hour.
If the vacuum can no reach-755mmHg after more than 2 hour's pumping, close the valves V
L
and V
H
on the gauge distributor
and stop pumping. One hour later, check the vacuum again. If the vacuum has changed, it means there is a leakage. Repair it.
After the above steps, replace the vacuum pump with the refrigerant pump and refill refrigerant.
6.4Copper pipe
Outdoor Unit
V
L
V
H