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non-condensable gas and moisture from the system.
Evacuation should be performed upon initial
installation and when unit is relocated.
8. Insert hexagonal wrench into the packed valve
(high pressure valve) and open the valve by
BEFORE PERFORMING EVACUATION
turning the wrench 1/4 counterclockwise. Listen
for gas to exit the system, then close the valve
Check to make sure the connective pipes
after 5 seconds.
between the indoor and outdoor units
9. Watch the Pressure Gauge for one minute to
are connected properly .
make sure that there is no change in pressure. It
Check to make sure all wiring is connected
should read slightly higher than the atmospheric
pressure.
10. Remove the charge hose from the service port.
Evacuation Instructions
11. Using hexagonal wrench, fully open both the high
pressure and low pressure valves.
Before using a manifold gauge and a vacuum
pump, read their operation manuals to make
sure you know how to use them properly.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal wrench until it hits against the stopper. DO NOT
Compound gauge
try to force the valve to open further.
-76cmHg
12. Tighten valve caps by hand, then tighten it using the proper tool.
Low pressure valve
13. If the outdoor unit uses all vacuum valves, and the vacuum position is at the main valve, the system is
Charge hose
not connected with the indoor unit. The valve must be tightened with a screw nut. Check for gas leaks
before operation to prevent leakage.
•
After confirmation of the above conditions, follow these guidelines when performing wiring:
•
Refrigerant charging must be performed after wiring, vacuuming, and the leak testing.
Low pressure valve
•
DO NOT exceed the maximum allowable quantity of refrigerant or overcharge the system.
Doing so can damage the unit or impact it's functioning.
1. Connect the manifold gauge's charge hose
•
Charging with unsuitable substances may cause explosions or accidents. Ensure that the
to the service port on the outdoor unit's low
appropriate refrigerant is used.
pressure valve.
•
Refrigerant containers must be opened slowly. Always use protective gear when charging
2. Connect the manifold gauge's charge hose
the system.
from the to the vacuum pump.
•
DO NOT mix refrigerants types.
3. Open the Low Pressure side of the manifold
•
For the R32 refrigerant model, make sure the conditions within the area have been made
gauge. Keep the High Pressure side closed.
safe by control of flammable material when the refrigerant added into air conditioner.
4. Turn on the vacuum pump to evacuate the system.
5. Run the vacuum for at least 15 minutes, or until
the Compound Meter reads -76cmHG (-1x105Pa).
Depending on the length of connective piping or the pressure of the evacuated system, you made need to
6. Close the manifold gauge's Low Pressure valve
add refrigerant. Refer to table below for refrigerant amounts to be added:
and turn o the vacuum pump.
7. Wait for 5 minutes, then check that there has
been no change in system pressure.
Connective Pipe
Length (m)
More than (pre-charge pipe
lengthxN) m
The standard pipe length is 7.5m.
EN - 28
Manifold Gauge
Pressure gauge
High pressure valve
Charge hose
Vacuum pump
Air Purging
Method
Vacuum Pump
Listen for gas to exit the system, then close the
valve after 5 seconds.
Valve body
Valve stem
9. Watch the Pressure Gauge for one minute to make
sure that there is no change in pressure. It should
read slightly higher than the atmospheric pressure.
10. Remove the charge hose from the service port.
11. Using hexagonal wrench, fully open both the
high pressure and low pressure valves.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal
wrench until it hits against the stopper. DO NOT
try to force the valve to open further.
12. Tighten valve caps by hand, then tighten it
using the proper tool.
13. If the outdoor unit uses all vacuum valves,
and the vacuum position is at the main valve,
the system is not connected with the indoor
unit. The valve must be tightened with a
screw nut. Check for gas leaks before
operation to prevent leakage.
Additional Refrigerant
Liquid Side: Ø 6,35 (Ø 1/4")
(Total pipe length - pre-charge
pipe length xN) x12g/m
Flare nut
Cap
Liquid Side: Ø 9,52 (Ø 3/8")
(Total pipe length - pre-charge
pipe length xN) x12g/m
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