Panasonic U-8MF3R7 Installation Instructions Manual page 29

Flare nut
Liquid
(ø9.52)
Discharge
tube
tube
12 HP
10 HP
Valve cap
Valve cap
(width 14)
Flare nut
(width 14)
Flare nut
(ø6.35)
(ø6.35)
Service port cap
Service port cap
(width 17)
Balance
(width 17)
Balance tube
Service port cap
tube
Service port cap
(width 17)
(width 17)
Valve cap
Valve cap
(width 27)
(width 19)
Flare nut
Flare nut
(ø12.7)
(ø9.52)
Liquid
Liquid
tube
tube
Discharge
Discharge
tube
tube
14 HP
Valve cap
(width 14)
Flare nut
(ø6.35)
Service port cap
(width 17)
Balance
tube
Service port cap
(width 17)
Valve cap
(width 27)
Flare nut
(ø12.7)
Liquid
tube
Discharge
tube
16 HP
Valve cap
(width 14)
Flare nut
(ø6.35)
Service port cap
Balance
(width 17)
tube
Service port cap
(width 17)
Valve cap
(width 27)
Flare nut
(ø12.7)
Liquid
tube
Discharge
tube
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.)
Flare nut
(ø15.88)
Suction tube
Unit: mm
Unit: mm
Service port cap
Service port cap
(width 17)
(width 17)
Service port cap
Service port cap
(width 17)
(width 17)
Valve cap
Valve cap
(width 17)
(width 27)
Valve cap
Valve cap
(width 24)
(width 24)
Flare nut
Flare nut
(ø15.88)
(ø15.88)
Suction tube
Suction tube
Unit: mm
Service port cap
(width 17)
Valve cap
(width 30)
Service port cap
(width 17)
Valve cap
(width 17)
Suction tube
Unit: mm
Service port cap
(width 17)
Valve cap
(width 30)
Service port cap
(width 17)
Valve cap
(width 17)
Suction tube
Use two adjustable wrenches, as shown in the
figure, when removing the liquid tube valve flare
nut and the discharge tube valve flare nut.
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.
● 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.
Work method Work method
Field-supply tube
Brazing locations
CAUTION
1. Be sure to use nitrogen.
Oxygen, CO , and CFC must not be used.
2
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.
29
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.)
Remote valve
Taping
Pressure-reducing Pressure-reducing
valve (regulator)
valve (regulator)