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7.3 Charging Operation
After vacuum pumping, check that the gas and liquid stop valves are completely closed.
Charge additional refrigerant (tolerance: 1.1lbs(0.5kg)) from the check joint of liquid stop valve. If the
specified refrigerant quantity can not be charged, follow the procedure below.
(1)
Fully open the stop valve for gas side (In case of heat recovery system, fully open the stop valve for
(1)
high/low pressure and low pressure gas pipe).
(2)
(2)
Operate the compressor in cooling mode and charge refrigerant (tolerance: 1.1lbs(0.5kg)) from the
(2)
(2)
check joint of the liquid stop valve. At this time, the liquid stop valve is slightly opened.
(3)
(3)
(3)
After refrigerant charge, fully open the stop valve for both liquid and gas sides.
(3)
(3)
Outdoor Unit
Stop Valve
(Liquid Piping
Stop Valve
(High/Low Pressure Gas Piping)
Stop Valve
(Low Pressure Gas Piping)
High/Low
Pressure Gas Piping
Liquid Piping
Manifold Pipe
< Heat Recovery System >
Outdoor Unit
Stop Valve
(Liquid Piping)
Stop Valve
(High/Low Pressure Gas Piping)
Stop Valve
(Low Pressure Gas Piping)
● Special Attention Regarding Refrigerant Gas Leakage
Pay attention to the critical gas concentration to avoid accidental refrigerant gas leakage before installing
air conditioning systems.
R:Totally Charged Refrigerant Quantity in System(lb (kg)
V:Room Volume for each Indoor Unit (ft
* This value should be decided according to the each country's regulation such as ISO5149, EN378 and ASHRAE
Standard 15. In the case that the calculated concentration is higher than this value, take the following actions:
1) Provide a gas leakage detector and exhaust fan controlled by its gas leakage detector.
2) Provide effective opening in the wall or door for ventilation to next door so that the critical gas concentration can
be maintained lower than the above value. (Provide an opening with area greater than 0.15% of floor surface at
the lower part of a door.)
Manifold
Gauge
Vacuum Pump
Indoor Unit
(or Water Module)
Insulation
[Cover the gas and liquid piping with insulation.]
Nitrogen Tank
(for Nitrogen Purging during
Brazing and Air Tight Test)
Manifold
Gauge
Vacuum Pump
Liquid Piping
High/Low Pressure Gas Piping
Low Pressure
Gas Piping
Switch BOX
Insulation
Insulation
[Cover the gas and liquid piping with insulation.]
Switch BOX
Manifold Pipe
(m
3
3
Nitrogen Tank
(for Nitrogen Purging during
Brazing and Air Tight Test)
Siphonic Refrigerant Cylinder
(R410A)
Weigher
Siphonic Refrigerant Cylinder
(R410A)
Weigher
Indoor Unit
(or Water Module)
C:Critical Concentration 0.026lbs/ft
≤
))
30
Charge the correct refrigerant quantity .
If not, compressor may be damaged due
to an excessive or insufficient refrigerant
charge.
Refrigerant charging from check joint of
gas stop valve may lead to compressor
failure. Be sure to charge refrigerant from
the check joint of liquid stop valve.
Insulate the liquid piping and gas piping
completely to avoid decreasing of
performance and dewing on the surface
of the pipe.
Insulate the flare nut and union of the
piping connection with insulation.
Check to ensure that there is no gas
leakage. If a severe refrigerant leakage
occurs, it will cause difficulty with
breathing or harmful gases would
generate when contacting with fire in the
room
(0.42kg/m
3
)
3
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