143
Installation
8.3.8.3
PIPING CONNECTION
1. Take the piping cover away from the unit.
Piping cover
2.
supplied refrigerant piping. Suspend the refrigerant
piping at certain points and prevent the refrigerant piping
from touching the weak part of the building such as wall,
ceiling, etc.
(If touched, abnormal sound may occur due to the
vibration of the piping. Pay special attention in case of
short piping length)
Gas pipe
Liquid pipe
3.
supplied.
4. The stop valves should be performed according to the
following section.
5. Use a pipe bender for pipe bending work when
connecting pipes.
6. Install the piping cover back in order to prevent rainwater
from entering the unit.
gas and the liquid stop valves.
after a long time and cause refrigerant leakage.
Piping size (mm) Tightening Torque (N.m)
14~18
34~42
50~62
63~77
Check to ensure that the stop valves are completely closed
before connecting.
8.2.8.3.1
OUTDOOR UNIT STOP VALVE
Spindle Type
①
Spindle valve
②
Flare nut
③
Cap
④
Check joint
Stop valve
(liquid)
Stop valve
(gas)
Closed upon factory shipping
Cap (Attach this after work)
Tighten the cap with
37 N.m torque
Check joint
(Only charging hose can be connected)
Tighten the cap with 16 N.m torque
O-Ring(rubber)
Hexagonal wrench
(size:5mm, field-supplied)
Spindle valve
Tighten the spindle with a torque
Refrigerant piping
Refrigerant pressure
Tightening Torque (N.m)
Stop valve
(gas/liquid)
① ③ ④
7-9 33-42 14-18
Stop valve
(Spindle type)
Flare nut
Use two spanners
here for piping
connection
two spanners here.
shall occur
At the test run, fully open the spindle of the stop valves.
If not fully opened, the outdoor unit will be damaged.
Do not apply an abnormal big force to the spindle valve at the
end of the opening.
8.2.8.3.2
BRAZING WORK
Use nitrogen gas for blowing during pipe brazing. If oxygen,
explosion or poisonous gas.
resulting in clogged expansion valves, etc. This will cause bad
Use a reducer valve when nitrogen gas blowing is performed
during brazing. The gas pressure should be maintained within
0.03 to 0.05MPa. If an excessively high pressure is applied to
a pipe, it will cause an explosion.
To Next Page
