Sharp DW-71-H Service Manual page 31

(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
2
down to 1.0 kgf/cm G. (When 1.0 kgf/cm
(9) Open the low pressure valve of gauge manifold to discharge gas so that the low pressure gauge pressure reduces
2
down to 1.0 kgf/cm G. (When 1.0 kgf/cm
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
(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.)
off on
Check valve for
vacuum pump
Vacuum pump
for R-12
2
G is reached, close the high pressure valve.)
2
G is reached, close the high pressure valve.)
2 G.
Low
pressuer
Valve opening
Gauge manifold
5 Valve opening
(down to 1 kgf/cm 2 G)
«
6
Valve closing
Valve closing
Gas side Liquid side
Charging cylinder
for HFC-134a
1
High
pressuer
Loosen
A
3
Valve opening (down to 1 kgf/cm
«
4 Valve closing
High pressure pipe side
Dehumidifier
Refrigeration cycle
Low pressure pipe side
4 Valve closing
«
7
Valve (slightly open)
Purge the inside of hose
31
2 8
¤ Discharge gas ¤ Tighten
G)
2
DW-71-H