Hitachi SAMURAI CLG2, Manual, Page: 37 / 118

Installation
Technical Catalogue
6
37
TCGB0051 rev 0 - 09/2009
6.5.2. Evacuation and Refrigerant charge
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Evacuation Procedures
Before charging, the part of refrigerant circuit between after discharge-side stop valve and before liquid-side
stop valve must be completely evacuated and dehydrated. Connect the vacuum pump and the low pressure
compound gauge to the field-supplied service joint of the liquid side.
1. Operate the vacuum pump to perform evacuation of the refrigerant circuit.
2. Continue vacuum pump operation until the pressure indication on the gauges shows approximately -756
mmHg.
3. Stop the vacuum pump, wait for about 5 minutes and confirm the vacuum pressure. Close the vacuum
pump connection line by setting the liquid inlet stop valve to the backseat position.
4. Slowly open the liquid inlet stop valve and the gas outlet stop valve of equipped the unit. Do not set the
liquid inlet stop valve to the backseat position.
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Refrigerant Charge
Exchange the vacuum pump with the refrigerant cylinder placed on the weighing scales.
1. Purge air from the cylinder connection line.
2. Charge liquid refrigerant R-407C into the refrigeration cycle by weighing the refrigerant cylinder.
3. Remove the charging hose.
4. After all evacuation and charging work, tighten the packing gland and the cap nuts of the unit stop valves.
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NOTE:
1. A gauge manifold or equivalent piping connected with a vacuum pump and a refrigerant cylinder is useful for quick evacuation
and charging work.
2. When charging by weight is ceased due to high ambient temperature, close the liquid inlet stop valve. Then operate the entire
system at the stage of initial start-up.
6.6. BMS connection
6.6.1. System
BMS connection is available by using HARC70-CE1(OP), optional BMS interface unit.
Upper Monitoring Device
HARC70-CE1
HARC70-CE1 OP
Upper Monitoring Device
H-Link
H-Link
LonWorks
LonWorks
Chiller 1 Chiller 1 Chiller 2 Chiller 3 Chiller 4
One interface HARC70-CE1 can connect up to 4 Chillers from a remote place using H-Link connection (Hitachi
communications protocol).
Protocol used by HARC70-CE1 (OP) is LonWorks. Physical channel connection with interface is FTT-10ª