Sharp DW-71-H Service Manual page 30

DW-71-H
(1) Start the vacuum pump. (Do not stop the vacuum pump until the evacuation of Step 13 is not completed.)
(2) At first open the additional valve of gauge manifold, and then open the low pressure valve and high pressure valve.
(At this time install the solenoid valve opening magnet if available.)
(3) Evacuate for 5 minutes.
To power source
Socket (for vacuum pump)
(4) After evacuating for 5 minutes close the additional valve and high pressure valve of gauge manifold, and then open
the low pressure valve.
(5) Open the liquid side valve of charging cylinder to enter the coolant (about 30 g) into the cycle from the gauge manifold.
At this time the low pressure gauge pressure must be about 3 to 4 kgf/cm
(6) Close the liquid side valve of charging cylinder and the high pressure valve of gauge manifold (close all the valves).
Start of vacuum pump
1
2
off on
Check valve for
vacuum pump
Vacuum pump
for R-12
Valve closing
2
Valve closing
off on
Check valve for
vacuum pump
3 Valve opening
«
6
Valve closing
Vacuum pump
for R-12
Valve closing
Gas side
Charging cylinder
for HFC-134a
Low High
pressuer pressuer
Valve opening
Gauge manifold
3 Valve opening
Valve closing
Gas side Liquid side
Charging cylinder
for HFC-134a
Low High
pressuer pressuer
Gauge manifold
8
4 Valve opening (charge about 30 g of coolant into
«
Liquid side
5 Valve closing
30
4 Valve opening
High pressure pipe side
Dehumidifier
Refrigeration cycle
Low pressure pipe side
2
G.
Valve closing
High pressure pipe side
Refrigeration cycle
Low pressure pipe side
refrigeration Cycle.)