101
Additional Refrigerant Charge
6.3 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 specied 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 high/low pressure
and low pressure gas pipe).
(2) Operate the compressor in cooling mode and charge refrigerant (tolerance: 1.1lbs(0.5kg)) from the check joint of the
liquid stop valve. At this time, the liquid stop valve is slightly opened.
After refrigerant charge, fully open the stop valve for both liquid and gas sides.
< Heat Pump System (2 Pipes)>
Charge the correct refrigerant quantity .
If not, compressor may be damaged due
to excessive or insufficient refrigerant.
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 there is a severe refrigerant
leakage, it will cause difficulty with
breathing or harmful gases would
generate when contacting with fire in the
room.
Stop Valve
(Liquid Piping)
Stop Valve
(High/Low Pressure Gas Piping)
Stop Valve
(Low Pressure Gas Piping)
High/Low Pressure Gas Piping
Liquid Piping
Insulation
Switch BOX
[Cover the gas and liquid piping with insulation.]
Switch BOX
Outdoor Unit
Vacuum Pump
Siphonic Refrigerant Cylinder
(R410A)
Refrigerant Scale
Nitrogen Tank
(for Nitrogen Purging during
Brazing and Air Tight Test)
Indoor Unit
Manifold Pipe
Manifold
Gauge
Insulation
Outdoor Unit
Stop Valve
Manifold
Gauge
Vacuum Pump
Nitrogen Tank
(for Nitrogen Purging during
Brazing and Air Tight Test)
Siphonic Refrigerant Cylinder
(R410A)
Refrigerant Scale
High/Low
Pressure Gas Piping
Liquid Piping
(Liquid Piping)
Stop Valve
(High/Low Pressure Gas Piping)
Stop Valve
(Low Pressure Gas Piping)
Manifold Pipe
Insulation
< Heat Recovery System (3 Pipes)>
Indoor Unit
(or Water Module)
[Cover the gas and liquid piping with insulation.]
(or Water Module)
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.
Totally Charged Refrigerant Quantity in System (kg)
≤ Critical Concentration (lbs/ft³)
Room Volume for each Indoor Unit (ft³)
*This value should be decided according to the each country’s regulation. In the case that the calculated concentration is
higher than critical concentration , take the following actions:
(1) Provide a gas leakage detector and ventilation fan(s) controlled by its gas leakage detector.
(2) Provide each eective 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. (An opening with area more than 0.15% of oor surface at the lower part of a
door.)
The refrigerant R410A is incombustible and non-toxic.
However, if there is leakage and gas lls a room, it may cause suocation.
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