Advertisement
Air purging
Air and moisture in the refrigerant system have undesirable effects as indicated below:
●
Pressure in the system rises.
●
Operating current rises.
●
Cooling or heating efficiency drops.
●
Moisture in the refrigerant circuit may freeze and block capillary tubing.
●
Water may lead to corrosion of parts in th e refrigeration sys tem.
Therefore, the indoor unit and tubing between the indoor and outdoor unit must be leak tested
and evacuated to remove any noncondensables and moisture from the system.
Air purging with vacuum pump
●
Preparation
Check that each tube(both liquid and gas side tubes) between the indoor and outdoor units
have been properly connected and all wiring for the test run has been completed. Remove
the service valve caps from both the gas and the liquid side on the outdoor unit. Note that both
the liquid and the gas side service valves on the outdoor unit are kept closed at this stage.
Pipe length and refrigerant amount:
●
NOTE: N=2(one-twin models), N=3(
The Standard pipe length is vary according to the requirements of different area. For example, in North
America area, the standard pipe length is
16ft
(
).
5m
Connective pipe length
Pre-charge pipe length(ft/m)
(Standard pipe lengthxN)
More than (Standard pipe lengthxN)ft/m
When relocating the unit to another site perform evacuation using a vacuum pump.
Make sure the refrigerant added into the air conditioner is liquid form in any case.
Cautio n in handling the packed valve
Open the valve stem until it hits against the
stopper. Do not try to open it further.
Securely tighten the valve stem cap with a
spanner or the like.
Valve stem cap tightening torque (See the
Tightening torque table in previous page ).
When Using the Vacuum Pump
(For information on the use of the manifold
valve, refer to its operation manual.)
1. Completely tighten the flare nuts, A, B, C, D,
connect the manifold
charge port of the low-pressure valve on the
gas pipe side.
2. Connect the charge hose connection to the
vacuum pump.
3. Fully open the handle Lo of the manifold valve.
one-three models
25ft
Air purging
method
Use vacuum
pump.
Use vacuum
pump.
valve charge hose to a
), N=4(one-four models), N=5(one-five models).
(
7.5m
). While in the other areas, the standard pipe length is
Additional amount of refrigerant to be charged
(
R410A
)
φ
Liquid side:
1/4
(
6.35
(Total pipe length - standard pipe lengthxN)x
φ
Liquid side:
(
9.52
3/8
(Total pipe length - standard pipe lengthxN)x
Outdoor
unit
Packed valve
Valve body
35
AIR PURGING
)
0.16oZ
)
0.32oZ
Refrigerant
A
Gas side
C
Liquid side
D
B
Half union
Fig.65
Flare nut
Stopper
Cap
Valve stem
Fig.66
(
15g
)/ m
( ft )
)/
(
30g
( ft )
m
Indoor
unit
Advertisement
