Measurement Device Used For Refrigerant Insertion; Procedure For Refrigerant Insertion - Hitachi RCUE40AG2 Service Manual

Maintenance

6.11.2. Measurement device used for refrigerant insertion

Measurement device for R407C is not compatible with that for R22 due to the following reasons, therefore,
do not divert them. These devices should be controlled separately to avoid being mixed.
Measurement device
Manifold valve
Hose for charge
Charging cylinder
Detector of gas leakage

NOTE:
The specifi cation of connection screw is different from measurement device for R410A.
R407C, R404A
−
R410A
−

6.11.3. Procedure for refrigerant insertion

R407C should be added in liquid state.
pag. 173
SMGB0003 rev.0 - 11/2006
Reasons
Pressure-proof criteria is different
−
Material spec. of packing is different
−
(question of deterioration)
If R22 is mixed, sludge is occurred due to
−
the fl ow of mineral oil to devices, which
may cause a clogging of cycle or accident
in compressor.
Detection method is different
−
Sensor of conventional detector of gas
−
leakage is very low, and practically it is
impossible to use.
UNF7/16
UNF1/2
Manifold valve (with
sight glass)
Specialized for R407C
Connect
to (C) (D)
parts
Hose for charge
Specialized for R407C
Remarks
Pay special attention not to use a hose for Pay special attention not to use a hose for
charge for R22.
It is possible to change the composition
when putting from refrigerant tank to
charging cylinder.
Under studying the handling.
Refrigerant tank
(with siphon pipe)
Specialized for R407C
Brown
Balance
6 6