RZQ71~12 RZQ100~140B8W1B
Split System air conditioners
4PW23691-1A
Installation manual
8
■
Since the side boards may be deformed if only a torque wrench
is used when loosening or tightening flare nuts, always lock the
shut-off valve with a wrench and then use a torque wrench.
Do not place wrenches on the valve cover.
Applying an excessive torque may distort the interior stop valve
surface causing gas to leak inside the valve and causing the
flare nut to crack eventually.
Do not apply force on the valve cover, this may result in a
refrigerant leak.
■
For cooling operation under low ambient temperature or any
other operation under low pressure, apply silicon pad or similar
to prevent freezing of the gas stop valve flare nut (see figure).
Freezing of the flare nut may cause refrigerant leak.
How to use the shut-off valve
Use hexagonal wrenches 4 mm and 6 mm.
■
Opening the valve
1.
Place the hex wrench on the valve bar and turn counter-
clockwise.
2.
Stop when the valve bar no longer turns. It is now open.
■
Closing the valve
1.
Place the hex wrench on the valve bar and turn clockwise.
2.
Stop when the valve bar no longer turns. It is now closed.
Cautions for handling the valve cover
■
The valve cover is sealed where indicated by the arrow.
Refer to the figure.
Take care not to damage it.
■
After operating the valve, be sure to tighten the valve cover
properly.
■
Check for refrigerant leakage after tightening the cap.
Cautions for handling service port
■
Always use a flexible charge hose with a push-rod and valve to
enable recovery of remaining refrigerant in the charge hose.
■
After the work, tighten the valve cover in place.
Tightening torque: 10.8~14.7 N•m
Precautions when connecting field piping and regarding
insulation
■
Be careful not to let the indoor and outdoor branch piping come
into contact with the compressor terminal cover.
If the liquid-side piping insulation might come into contact with it,
adjust the height as shown in the figure below. Also, make sure
the field piping does not touch the bolts or outer panels of the
compressor.
■
When the outdoor unit is installed above the indoor unit the
following can occur:
The condensated water on the stop valve can move to the
indoor unit. To avoid this, please cover the stop valve with
sealing material.
■
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, then the thickness of the sealing materials should
be at least 20 mm in order to avoid condensation on the surface
of the sealing.
■
Be sure to insulate the liquid and gas-side field piping and the
refrigerant branch kit.
(The highest temperature that the gas-side piping can reach is
around 120°C, so be sure to use insulating material which is
very resistant.)
Cautions for flare connection
■
Please refer to the table for the dimensions for processing flares
and for the tightening torques. (Too much tightening will end up
in splitting of the flare.)
1
Spanner
2
Torque wrench
Silicon sealing pad
(Make sure there is no gap)
Closing direction
A
Liquid side
B
Gas side
Tightening torque
Liquid pipe
13.5~16.5 N•m
Gas pipe
22.5~27.5 N•m
2
A
B
Any exposed piping may cause condensation or burns
if touched.
Piping
size
Flare nut
tightening torque
A dimensions for
processing flares
(mm)
Flare shape
Ø6.4
14.2~17.2 N•m
(144~176 kgf•cm)
8.7~9.1
Ø9.5
32.7~39.9 N•m
(333~407 kgf•cm)
12.8~13.2
Ø12.7
49.5~60.3 N•m
(504~616 kgf•cm)
16.2~16.6
Ø15.9
61.8~75.4 N•m
(630~770 kgf•cm)
19.3~19.7
Ø19.1
97.2~118.6 N•m
(989.8~1208 kgf•cm)
23.6~24.0
2
1
3
5
5
A
4
4
6
1
Compressor
2
Terminal cover
3
Indoor and outdoor
field piping
4
Corking, etc.
5
Insulation material
6
Bolts
A
Be careful with pipe,
bolt and outer panel
connections
R=0.4~0.8
45
° ±
2
90
°±
2
A
