VRF Air-Conditioner IOM
4
indoor unit horizontally and maintain the main
body vertical to the floor. Dismantle pump, small
defrosting tray and water level switch before
installation, strip off the insulated shield of water
level switch connecting line and then screw
together to make short circuit, directly connect
drainage pipe in accessories to the main defrosting
tray outlet (select left or right water outlet of
defrosting tray according to actual installation
condition).
Model
A
B C
D
E
F
G H
YDEC028-112 1245 680 150 760 450 1119 200 240
YDEC140-160 1670 680 150 1070 450 1542 200 240
5.
Installation of Refrigerant Piping
The piping at gas side and liquid side of
refrigerant shall be subjected to thermal insulation,
if not, the piping surface will have dew.
Please use thermal insulation material which is
capable of withstanding above 120
℃
high
temperature. Please strengthen thermal insulation
for refrigerant piping according to the installation
environment, otherwise, the surface of the thermal
insulation material may dew and frost.
Please comply with the following items:
Coat fatty oil or ether oil at horn mouth (inside
and outside) when connecting horn mouth nut.
Only use the horn mouth nut attached by the unit.
Other horn mouth nut may lead to refrigerant
leakage.
Please clamp flat or seal the pipe end in order to
prevent dust, moisture or other foreign matter
entering into pipe.
Except designated refrigerant, anything, for
example, air, shall not mix into refrigerating
circuit.
Before welding refrigerant piping, please conduct
nitrogen replacement or fill nitrogen into piping in
welding, and finally connect with indoor unit by
horn mouth.
When filling nitrogen into piping in welding,
guarantee to control the pressure with reducing
valve as 0.02MPa (0.2kgf/cm
2
) (like the feel of
breeze blowing cheek).
Do not use welding flux when welding refrigerant
piping connector. Please use copper base brazing
filler metal without welding flux.
The use of welding flux containing chlorine or
fluorine may corrode the purity of piping or
refrigerating system.
5.1
Piping connection
When connecting and dismantling piping to/from
air conditioner, simultaneously use an ordinary
spanner and a torque spanner.
For relevant tightening torque, please refer to the
following table.
Pipe diameter
Tightening torque
(N.m)
∮
6.35(1/4")
14.2~17.2
∮
9.53(3/8")
32.7~39.9
∮
12.7(1/2")
49.5~60.3
∮
15.88(5/8")
61.8~75.4
If it is necessary to install unit without torque
spanner, comply with the following method:
When using spanner to tighten the horn mouth nut,
the tightening torque on some point may suddenly
increase. Further tighten the horn mouth nut from
this position to the angle shown in the following
table.
Pipe diameter
Angle
tightened
further
Length of
recommended
tool arm
∮
6.35(1/4")
60°~90°
~150mm
∮
9.53(3/8")
60°~90°
~200mm
∮
12.7(1/2")
45°~75°
~250mm
∮
15.88(5/8")
45°~75°
~300mm
Caution
Caution
Hook
Dismantle pump assembly
Connect defrosting tray with
drainage pipe
Bolt
Gasket
Torque spanner
Ordinary spanner
Piping connector
Horn mouth nut
