4-7
(a) Vacuum dehydrating
After recovering the refrigerant, replace
the filter drier and connect the vacuum
pump to the service ports
r
and
t
at the
liquid receiver outlet piping and discharge
pressure regulating valve inlet, and then
vacuum up to 76cmHg. Disconnect the
vacuum pump, holding the refrigerant
circuit in the vacuum state. However, if air
enters in the refrigerant circuit, vacuum
up the circuit to 76cmHg and then
vacuum the circuit for another 2 hours or
more.
t
r
Vacuum Pump
(b) Cylinder weight recording
Place a refrigerant cylinder on the
weighing scale, and record the weight of
the cylinder.
(c) Charging of liquid refrigerant
1.After vacuum & dehydration, charge the
liquid refrigerant from port
t
.
(Aprrox. 50% of the specified amount
will be charged.)
2.Replace the manifold gauge hose to
port
e
and add the liquid refrigerant.
Then if it reached to the specified
amount close the cock of the refrigerent
cylinder.
t
R134a
e
R134a
Figure 1
Figure 2
CAUTION
Carry out the operation check after
the replacing and charging of
refrigerant, then replace the drier.
If it is not reached to the specified
amount due to the pressure valance,
close the cock of the ref. cylinder and
go to next 3 & 4.
3.Operate Automatic Pump Down first.
When the compressor stops during the
operation, end the Auto. P. D. operation
using Unit ON/OFF switch.
4.Open the cock of the ref. cylinder and
add the liquid refrigerant from port
e
.
Then if it reached to the specified
amount close the cock of the ref.
cylinder.
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