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4-7
(4) Vacuum-dehydrating, and refrigerant /
charging
If all the refrigerant has leaked out and air is
intermixed in the refrigeration circuit, remove
the cause of trouble and carry out vacuum-
dehydrating. Then charge the specified
amount of refrigerant.
[Required tools]
1. Refrigerant cylinder (content of 20kg)
equipped with joint for HFC134a
2. Gauge manifold with quick joints
3. Weighing scale (up to 50kg)
4. Vacuum pump
(a) Vacuum dehydrating
After recovering, 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
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