29
1. Be sure to use nitrogen.
Oxygen, CO
2
, and CFC must not be used.
2. Use a pressure-reducing valve on the nitrogen tank.
3. Do not use agents intended to prevent the formation of oxide
film. They will adversely affect the refrigeration oil, and may
cause equipment failure.
4. The balance tube is not used if only 1 outdoor unit is
installed. Use the unit in the same conditions as when it was
shipped from the factory.
●
Precautions for brazing
Be sure to replace the air inside the tube with nitrogen to
prevent oxide film from forming during the brazing process.
Be sure to use a damp cloth or other means to cool the valve
unit during brazing.
Pressure-reducing
valve (regulator)
Work method
Work method
Field-supply tube
Remote valve
Brazing locations Taping
Pressure-reducing
valve (regulator)
Nitrogen
CAUTION
Service port cap
(width 17)
Service port cap
(width 17)
Valve cap
(width 30)
Valve cap
(width 24)
Suction tube
Flare nut
(ø6.35)
Discharge
tube
Balance
tube
Balance
tube
Valve cap
(width 14)
Service port cap
(width 17)
Service port cap
(width 17)
Valve cap
(width 19)
Flare nut
(ø9.52)
Flare nut
(ø15.88)
Flare nut
(ø15.88)
Liquid
tube
Suction tube
Suction tube
Discharge
tube
Discharge
tube
Liquid
tube
Liquid
tube
8 HP
Unit: mm
Unit: mm
Unit: mm
Unit: mm
10 HP
14 HP
16 HP
Service port cap
(width 17)
Valve cap
(width 24)
Service port cap
(width 17)
Valve cap
(width 27)
Flare nut
(ø6.35)
Balance
tube
Flare nut
(ø6.35)
Valve cap
(width 14)
Service port cap
Service port cap
(width 17)
(width 17)
Valve cap
(width 19)
Flare nut
(ø9.52)
Valve cap
(width 27)
Flare nut
(ø12.7)
Valve cap
(width 17)
Valve cap
(width 30)
Service port cap
(width 17)
Service port cap
(width 17)
Suction tube
Valve cap
(width 17)
Valve cap
(width 30)
Service port cap
(width 17)
Service port cap
(width 17)
Valve cap
(width 14)
Service port cap
(width 17)
Service port cap
(width 17)
Discharge
tube
Liquid
tube
Balance
tube
Flare nut
(ø6.35)
Valve cap
(width 27)
Flare nut
(ø12.7)
Valve cap
(width 14)
Service port cap
(width 17)
Service port cap
(width 17)
Do not apply an adjustable wrench
to the hexagonal part.
Do not use two adjustable wrenches when
removing or installing the balance tube flare nut. In
particular, do not apply an adjustable wrench to the
hexagonal part at the top of the valve. (If force is
applied to this part, gas leakage will occur.)
Use two adjustable wrenches when removing or installing the
balance tube flare nut.
In particular, do not apply an adjustable wrench to the
hexagonal part at the top of the valve.
If force is applied to this part, gas leakage will occur.
Apply an adjustable wrench to settle the fixing tool as shown in
the figure. If not used, the valve fixing tool will get distorted.
Use two adjustable wrenches, as shown in the
figure, when removing the liquid tube valve flare
nut and the discharge tube valve flare nut.
1. Do not apply a wrench to the valve cap
when removing or installing the flare
nuts.
Doing so may damage the valve.
2. If the valve cap is left off for a long
period of time, refrigerant leakage will
occur.
Therefore, do not leave the valve cap
off.
3. Applying refrigerant oil to the flare
surface can be effective in preventing
gas leakage, however, be sure to use
a refrigerant oil which is suitable for the
refrigerant that is used in the system.
(This unit utilizes R410A refrigerant, and
the refrigerant oil is ether oil (synthetic
oil). However, hub oil (synthetic oil) can
also be used.)
Service port cap
Balance
tube
Flare nut
(ø15.88)
Suction tube
Discharge
tube
Liquid
tube
Unit: mm
12 HP
Service port cap
(width 17)
Valve cap
(width 24)
Service port cap
(width 17)
Valve cap
(width 17)
Flare nut
(ø6.35)
Valve cap
(width 14)
Service port cap
(width 17)
(width 17)
Valve cap
(width 27)
Flare nut
(ø12.7)
00_341136_2WAY_Eng.indb 29
2022/9/19 9:27:26
