Sharp DW-71-H Service Manual page 32

DW-71-H
(11) At first open the additional valve of gauge manifold. Then, slowly open the low pressure side and high pressure side
to evacuate the cycle. (Do not apply undue load to the vacuum pump.)
(12) Evacuate for 30 minutes (with valves opened).
(13) After completion of evacuation close all the valves.
(14)Close the additional valve of gauge manifold, and stop the vacuum pump.
(15)Read indication of charging cylinder.
(16)Open the liquid side valve of charging cylinder to charge the specified quantity of coolant from the high pressure
valve of gauge manifold.
Adjust the quantity of charged coolant, seeing the indication of charging cylinder, with the high pressure
valve of gauge manifold.
(17)After the coolant is charged, only the low pressure valve of gauge manifold must be opened.
1 Valve opening
«
4
Valve closing
off on
Check valve for
vacuum pump
2 (Siowly)
Valve opening
«
4 Valve closing
Vacuum pump
for R-12
Valve closing
Gas side Liquid side
Charging cylinder
for HFC-134a
Vacuum pump stop
2
1 Valve closing
off on
Check valve for
vacuum pump
1 Valve closing
«
(Slowly)
6
Valve opening
Vacuum pump
for R-12
Valve closing
Gas side Liquid side
Charging cylinder
for HFC-134a
3
Read indication of quantity of gas filled in cylinder, and
record the specified quantity.
Low High
pressuer pressuer
Gauge manifold
3 (Siowly)
Valve opening
«
4
Valve closing
High pressure pipe side
Dehumidifier
Refrigeration cycle
Low pressure pipe side
Valve closing
Low High
pressuer pressuer
Gauge manifold
1
Valve closing
«
(Slowly)
5 Valve opening
High pressure pipe side
Dehumidifier
Refrigeration cycle
Low pressure pipe side
1 Valve closing
7
«
4
Valve opening
32
7