Sharp DW-71-H, Service Manual, Page: 29 / 40

29
DW-71-H
Preparation for coolant charging
(1) Preliminary charge the coolant into the charging cylinder.
Quantity of gas = Specified qu 30 g + (retention in piping)
Note:
When charging the coolant into the charging cylinder, be sure to discharge the air from the cylinder and hose.
(2) Connect the tools as shown above, and close all the valves.
(3) Connect the start relay and protector of compressor so that the compressor is ready to start.
(4) Follow the procedure (1) to (8) shown in the figure.
Procedure
For R-12 i 1/4 )
with cap
To power source
Socket (for vacuum pump)
Switch ON
on off
Check valve for
vacuum pump
Vacuum pump
for R-12
Reducer ( 3/8,1/4 )
Charging hose (10mm)
Valve opening
Valve opening
Valve closing
Valve closing
Additional valve opening
Low
pressuer High
pressuer
Gauge manifold
Low pressure pipe side
High pressure pipe side
Dehumidifier
Refrigeration cycle
3-way reducer ( 3/8,3/8,10mm )
Liquid side
Gas side
Charging cylinder
for HFC-134a
«
«
«
«
Charge gas, adijusting valves
Valve opening
Purge the inside of
cylinder and hose.
Valve closing
Valve opening
Valve closing
Valve opening
Valve closing
Valve closing
Liquid side Gas side
Charging cylinder
for HFC-134a
Coolant gas cylinder
1
2 3
4
5
6
7
8
[Evacuation/gas charge procedure]
Evacuation
(1) Evacuation (5 minutes) (2) Coolant charging (approx. 30 g) (3) Evacuation (30 minutes) (4)
Coolant gas charging (specified amount)
The check valve is provided additionally to prevent back flow of vacuum pump oil. The power supply for the
vacuum pump must not be turned off until the cycle (1)
(2) (3) shown above is completed so as to attain
the specific degree of vacuum.
Follow the procedure shown below.