Additional Refrigerant - Hitachi Set Free Série Manuel D'installation

Additional refrigerant charge

Heat pump system
Stop valve
(High/low pressure gas line)
Stop valve
(Low pressure gas line)

Heat recovery system
Stop valve
(High/low pressure gas line)
Stop valve
(Low pressure gas line)
Charge the correct refrigerant quantity according to
excess or insufficient refrigerant charge.
Refrigerant charge 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 large refrigerant leakage occurs, it will cause difficulty with breathing or harmful
gases would occur if a fire was being used in the room.
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PMML0294A_rev.2_02-2014.indb 54
Outdoor unit
Stop valve
(liquid line)
Gas line
Liquid line
Multi-kit
Outdoor unit
Stop valve
(liquid line)
Liquid line
Gas line (High/low)
Gas line (low)
Insulation
Multi-kit

Additional refrigerant

PMML0294A rev.2 - 07/2014
Nitrogen tank
(for nitrogen blow during brazing
and air tight test)
Manifold
gauge
Siphonic refrigerant cylinder
(R410A)
Vacuum pump
Weigher
Indoor unit
Insulation (Cover the gas and liquid pipe with insulation)
Nitrogen tank
(for nitrogen blow during brazing
and air tight test)
Manifold
gauge
Siphonic refrigerant cylinder
(R410A)
Vacuum pump
Weigher
CH unit
Insulation
(Cover the gas and liquid pipe with insulation)
CH unit
charge. If not, a compressor may be damaged due to an
Indoor unit
14/07/2014 12:28:32