VRF Air-Conditioner IOM
4
4.2 Check if the unit is horizontally level
Make sure that the unit is installed level using a
spirit level or a plastic tube filled with water. (Refer
to Fig. 4)
(One thing to watch out for in particular is if the
unit is installed so that the slope is not in the
direction of the drain pipe, which might cause
condensate water leaking.)
Fig. 4 Check Unit Level
4.3 Install the suspension bolts
Shall ensure the unit being in horizontal level and
installed firmly. Install anchor bolt to fix unit
securely if necessary.
5
REFRIGERANT PIPING WORK
Execute insulation completely on both sides of the
gas piping and the liquid piping. Otherwise,
condensate water may be formed and dropped
down.
Please use the insulation materials that can
withstand temperature of at least 120°C. Reinforce
the insulation on the refrigerant piping according
to the installation environment. Otherwise,
condensate water may form on the surface of the
insulation.
Please follow the below items.
Apply ester oil or ether oil to the flare section
(internal and external surface) when using a flare
connection.
Only the flare nuts included with the unit can be
used. Using different flare nuts may cause
refrigerant leakage.
To prevent dust, moisture or other contaminant
from infiltrating the piping, either pinch the end or
cover it with tape.
Do not allow anything other than the designated
refrigerant to get mixed into the refrigerant circuit,
such as air, etc.
When brazing the refrigerant piping, perform
nitrogen replacement first, or perform brazing
while feeding nitrogen into the refrigerant piping,
and finally connect the indoor unit using the flare
connections.
When brazing a pipe while feeding nitrogen inside
the pipe, make sure to set the nitrogen pressure to
0.02MPa (0.2kgf/cm
2
) around.
Do not use flux when brazing refrigerant piping.
Therefore, use the phosphor copper brazing filler
metal (BCuP) which does not require flux.
If chlorine or fluoric based flux is used, it will cause
pipe corrosion and contamination of refrigerant oil
5.1 Connect the piping
Be sure to use both a spanner and torque wrench
together, as shown in Fig. 5, when connecting or
disconnecting pipes to/from the unit.
Fig. 5 Piping Connection
Refer to Table 1 for the tightening torque.
Table 1
Pipe Diameter
mm (inch)
Tightening Torque
(N
·
m)
∮
6.35 (1/4") 14
～
17
∮
9.53 (3/8") 32.5
～
40
∮
12.7 (1/2") 49.5
～
60
∮
15.88 (5/8") 62
～
75
∮
19.05 (3/4") 80
～
95
∮
22.23 (7/8") 100
～
115
If no torque wrench is available, please follow the
below method to do the installation.
Using a wrench to tighten flare nuts causes the
tightening torque to suddenly grow much tighter
after a certain point. From that point, tighten the
nut further by the appropriate angle listed in Table
2.
Table 2
NO
NO
NO
CAUTION
CAUTION
CAUTION
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