Hitachi FSXN1E Series, Installation And Operation Manual, Page: 68 / 756

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Heat pump system
Outdoor unit
Manifold
gauge
Nitrogen tank
(for nitrogen blow during brazing
and air tight test)
Vacuum pump
Gas line
Liquid line
Multi-kit Insulation (Cover the gas and liquid pipe with insulation)
Indoor unit
Siphonic refrigerant cylinder
(R410A)
Weigher
Stop valve
(Low pressure gas line)
Stop valve
(High/low pressure gas line)
Stop valve
(liquid line)
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Heat recovery system
Outdoor unit
Manifold
gauge
Nitrogen tank
(for nitrogen blow during brazing
and air tight test)
Vacuum pump
Gas line (High/low)
Liquid line
Multi-kit
Insulation
(Cover the gas and liquid pipe with insulation)
Indoor unit
Siphonic refrigerant cylinder
(R410A)
Weigher
Stop valve
(Low pressure gas line)
Stop valve
(High/low pressure gas line)
Stop valve
(liquid line)
CH unit
Gas line (low)
CH unit
Insulation
Charge the correct refrigerant quantity according to Additional refrigerant charge . If not, a compressor may be damaged due to an
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.
54 PMML0294A rev.2 - 07/2014
Additional refrigerant charge
PMML0294A_rev.2_02-2014.indb 54 14/07/2014 12:28:32