Hitachi FSXN Series Service Manual page 308

10 Servicing
13 Remove the remaining refrigerant oil -B- in the compressor from
the discharge pipe -A- into an oil pan -C- and measure the quantity
of oil collected -D- (measure cup).
This procedure must be carried out for the replacement of the
constant speed compressor or the Inverter compressor.
N O T E
• The refrigerant oil change must be added if:
Quantity of remaining refrigerant oil in the old compressor
> Quantity of refrigerant oil pre-charged in the new compressor.
• Do not add the refrigerant oil if:
Quantity of remaining refrigerant oil in the old compressor < Quantity of oil refrigerant pre-charged in the new
compressor.
• The quantity of refrigerant oil needed to add in the circuit is calculated as follows:
Quantity of remaining refrigerant oil in the old compressor + Quantity of refrigerant oil collected in step 11 +
200 cc*) – (Initial charge of refrigerant oil in the compressor for each model).
Compressor
For inverter (E656DHD)
For constant speed (E655DH)
For constant speed (E855DH)
* 200 cc: This value is considered not to be removed from the chamber
• If the refrigerant oil is contaminated, exchange all of them with the new refrigerant oil.
14 Fit the new compressor. When attaching the nut on the front
side, take care not to deform the discharge pipe -B-.
Weld -A- the different parts in the following order:
• Oil discharge pipe -C-
• Discharge pipe -B-.
• Suction pipe -D-.
N O T E
• Wet cloth for cooling -E-.
• When fitting the new compressor on the base, take care
not to touch the piping, as it may be damaged.
• The new compressor must be fitted with the cap. Remove
the cap just before welding the compressor.
• Connect the charge hose with the check joint in the low pressure side to release pressure.
• When welding the suction pipe, verify that the connecting part is firmly inserted into the compressor. The root
of the pipe is cooled to avoid welding material getting into the compressor.
304
SMGB0065 rev. 1 - 12/2010
A
B
C
Initial charge of refrigerant oil
1100 cc
500 cc
1100 cc
A
D
E
B
C
D
A
A