13.2 Charging the refrigerant <R404A>
1. Use the following procedure to charge the refrigerant.
(1) Operation procedure
– 46 –
(2) Evacuation
Connect the high pressure side of the gauge
manifold to the service valve A, and the low
pressure side to the compressor suction operation
valve D (intermediate seat) and the service valve
B with T joint, and do the evacuation at three
places. If any gas leakage is checked with
nitrogen, etc., purge the residual pressure from the
service valve B and do the evacuation.
(3) Gas charge
1 As shown below, place the cylinder upside down
to charge the liquid through the service valve A.
Caution: In case of the orange belt painted
cylinder, charge the liquid, standing the
cylinder in the normal state.
2 Since the multi-function valve is installed on the
system, the pressure is necessary to open the
main valve. Before running the engine slowly,
charge 30 to 50g (amount for one charge hose)
through the suction operation valve D of the
pump in the liquid state.
3 When the temperature rises into the moderate
state (the refrigerant liquid does not flow.), check
the charge amount.
Caution: Take care to prevent charging an
amount beyond the specified value.
4 If the specified amount is not charged, slowly run
the compressor (like idling) to additionally
charge the gas through the operation valve D.
If the specified amount is charged through the
service valve A, it is properly completed as it is.
Caution: Since the pressure of the service valve
A section becomes higher than that of
the cylinder when the compressor runs,
additional charging is impossible. For
additional charging, use the operation
valve D.
For the standard working pressure at the
specified charge amount, refer to page 41.
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