How To Respond, When Refrigerant Is Deficient; Refrigerant Charging After The Compressor Replacement - Fujitsu Airstage VR-II Series Service Manual

<How to respond, when refrigerant is deficient>
Reuse the refrigerant of the broken master unit.
High pressure (service port)
All 3 Way-Valves Close
Liquid
Hp Gas
Lp Gas
Connect the high pressure service port of the broken master unit and the low pressure pipe of the broken
master unit by pressure gauge.
>>> Refrigerant release from the heat exchanger of the broken master unit.
(Refrigerant is removed until refrigerant shortage is resolved)
When new refrigerant is added to the operating system, check the weight of additional refrigerant,and
adjust the total refrigerant amout after repairing.
Recover the remaining refrigerant in the broken master unit from the service port(s).
2

2. Refrigerant charging after the compressor replacement.

If the amount of recovered refrigerant is available that was pulled out of outdoor unit which compressor
was replaced.
(When the refrigerant is recovered by refrigerant recovery machine, and its weight is measured.)
>>> Perform vacuuming of repaired outdoor unit thoroughly, and add the refrigerant with the recovered
amount.
If the amount of recovered refrigerant from outdoor unit that compressor was replaced is not sure.
(When the refrigerant leakage was the case.)
>>> Once recover all units' refrigerant, and recharge the calculated amount of refrigerant (Original
amount and additional amount) again after vacuuming.
Note: To use the recovered refrigerant is not recommended in case of refrigerant leakage.
Always charge fresh refrigerant with correct amount for the system after repairing.
Broken
master unit
Open and adjust
Substitutional
master unit
04-94
Slave
unit #1