Check Of Leakage Position - Hitachi RCUE40AG2 Service Manual

Maintenance

CAUTION
Do NOT add
refrigerant in gas
state from suction
side of compressor
(gas side stop valve).

CAUTION
Refrigerant should
be added in a
suitable volume
since excess or
less insertion cause
alarm or accident of
compressor.
pag. 174
SMGB0003 rev.0 - 11/2006
1. After vacuuming, additional refrigerant should be inserted in liquid state with stop
valve of liquid side and gas side close. (Confi rm the volume by the balance)
In principal, collected refrigerant from water side heat exchanger to outside of
refrigeration cycle by collection device is measured to determine the volume. If
it is impossible to measure it, use the following fi gure to determine the volume,
confi rming the balance pressure after collection operation.
2. If it is impossible to add regulated volume due to the lower ambient temperature,
compressor is operated in cooling mode and liquid refrigerant should be added from
stop valve for refrigerant insertion (C). Then, regulated volume is added with the
liquid side stop valve (high pressure side) open a little bit.

6.11.4. Check of leakage position

Insertion of additional refrigerant
Alarm:
Check for refrigerant leakage should be performed steadily. The refrigerant used
in this unit is incombustible, non-toxic and odourless safe one. However, toxic gas
is produced when leaked refrigerant is exposed to fi re. And oxygen will be lacked
due to that refrigerant, its gravity is higher than air, is spread in the fl oor.
Check steadily again using the
detector of gas leakage specialized
for R407C