Hisense Hi-Therma Serie Manual De Instalación Y Mantenimiento página 25

REFRIGERANT PIPING WORK
8.3 PIPING CONNECTION
1 Take the piping cover away from the unit.
2 Connect the indoor unit and the outdoor unit with
field-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)
3 Apply the oil thinly at the seat surface of the flare nuts(*)
and pipes before tightening. Refrigerant oil is field-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.
(*) The factory-supplied flare nuts are used to connect the gas
and the liquid stop valves.
?
N O T E
• If the flare nut is tightened too hard, the flare nut may crack after a
long time and cause refrigerant leakage.
• Tightening Torque for flare nuts:
Piping size (mm)
Φ6.35
Φ9.53
Φ12.7
Φ15.88
!
C A U T I O N
•
Check to ensure that the stop valves are completely
closed before connecting.
Piping cover
Liquid pipe
Gas pipe
Tightening Torque (N.m)
14~18
34~42
50~62
63~77
8.3.1 OUTDOOR UNIT STOP VALVE
Spindle Type
 Spindle valve
 Flare nut
 Cap
 Check joint
Check joint
(Only charging hose can be connected)
Tighten the cap with 16 N.m torque
Cap (Attach this after work)
Tighten the cap with
37 N.m torque
O-Ring(rubber)
Hexagonal wrench
(size:5mm, field-supplied)
Stop valve
(gas/liquid)
Stop valve
(Spindle type)
Flare nut
!
C A U T I O N
• 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.
8.3.2 BRAZING WORK
!
C A U T I O N
• Use nitrogen gas for blowing during pipe brazing. If oxygen, acetylene
or fluorocarbon gas is used, it will cause an explosion or poisonous
gas.
• A lot of oxidation film will occur inside of tubes if no nitrogen gas
blowing is performed during brazing work. This film will be flecked off
after operation and will circulate in the cycle, resulting in clogged
expansion valves, etc. This will cause bad influence to the compressor.
• 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.
14
Stop valve
(liquid)
Stop valve
(gas)
Closed upon factory shipping
Spindle valve
Tighten the spindle with a torque
Counterclockwise.... Open
Clockwise .... Close
Refrigerant pressure
Refrigerant piping
Tightening Torque (N.m)
 

7-9
33-42 14-18
Do not work with
two spanners here.
Refrigerant leakage
shall occur
Use two spanners
here for piping
connection