Sharp DW-71-H - Page 31

31
DW-71-H
(7) Loosen the joint (a) to release gas.
Check balance of high/low pressure.
(8) Open the high pressure valve of gauge manifold to discharge gas so that the high pressure gauge pressure reduces
down to 1.0 kgf/cm
2
G. (When 1.0 kgf/cm
2
G is reached, close the high pressure valve.)
(9) Open the low pressure valve of gauge manifold to discharge gas so that the low pressure gauge pressure reduces
down to 1.0 kgf/cm
2
G. (When 1.0 kgf/cm
2
G is reached, close the high pressure valve.)
Cares when performing operations (8) and (9)
Discharge gas remaining in the cycle. Take care so that the air does not enter into the cycle. Never allow
reduction of gauge pressure below 1.0 kgf/cm
2
G.
(10)Tighten the joint (A) which has been loosed in Step (7) above.
Slightly open the liquid side valve of charging cylinder, and close (A), discharging gas.
(Purge the inside of hose.)
«
«
«
¤ ¤
on
A
off
Check valve for
vacuum pump
Vacuum pump
for R-12
1
2
3
4
4
5
6
7
8
Valve opening
Valve opening
(down to 1 kgf/cm
2
G)
Valve opening (down to 1 kgf/cm
2
G)
Valve closing
Valve closing
Valve closing
Valve (slightly open)
Purge the inside of hose
Valve closing
Low
pressuer
High
pressuer
Gauge manifold
Loosen Discharge gas Tighten
Low pressure pipe side
High pressure pipe side
Dehumidifier
Refrigeration cycle
Liquid sideGas side
Charging cylinder
for HFC-134a