Hitachi RAS-8FSXN - Removing the Stop Valve

10.12 Removing the stop valve
D A N G E R
• Turn OFF all the power source switches.
N O T E
• For servicing use the following tools:
- Pliers. - Burner.
- Phillips screw driver. - Wet cloth.
1 Before
starting with the task, collect the refrigerant from the refrigerant circuit into a cylinder and turn OFF the unit power
supply line.
2 Remove the front service cover as described in the procedure Removing the front service cover
, see on page 292.
3 Remove the following covers fixed with the screws -J-:
a Heat pump system: Remove the stop valve cover 1 -D-.
b Heat recovery system: Remove the stop valve cover 1 -D- and stop valve cover 2 -E-.
*1
*2
*1
*2
A
B
C
D
E
J
H
H
H
G
F
I
G
F
4 When removing the high pressure gas stop valve -A- and the low pressure gas stop valve -B-, cover the stop valves
with a wet cloth to avoid the heat and remove the welding material.
When
removing the liquid stop valve -C-, remove the welding from the piping of the stop valves (low pressure stop valve
-F- and high pressure stop valve -G-) .
N O T E
• In the
case of the heat pump system, connect the charge hose to the low pressure gas stop valve check
joint before removing the welding.
• To remove the welding of the high pressure stop valve -A- and the low pressure stop valve -B-, the RC cover
should be removed to protected with a sheet of metal.
5 Remove the screws -H- that attach the plate -I- and pull out the stop valves at the same time as the plate -I- (if the stop
valves are fitted only for liquid, the stop valve can be removed without removing the plate).
6 To fit the stop valve, carry out this procedure in reverse order.
N O T E
• Cover the stop valve with a wet cloth to avoid the heat when mounting or removing the brazing.
• The maximum temperature allowed in the stop valves is 120 °C.
10 Servicing
317
SMGB0065 rev. 1 - 12/2010
10