14
GB
Satisfy the minimum insertion depth in the table below when expanding on-site
piping
Pipe diameter
(mm [in])
Minimum insertion depth
(mm [in])
5 [7/32] or more, less than 8 [11/32]
6 [1/4]
8 [11/32] or more, less than 12 [1/2]
7 [9/32]
12 [1/2] or more, less than 16 [21/32]
8 [11/32]
16 [21/32] or more, less than 25 [1]
10 [13/32]
25 [1] or more, less than 35 [1-13/32]
12 [1/2]
35 [1-13/32] or more, less than 45 [1-25/32]
14 [9/16]
After evacuation and refrigerant charging, ensure that the handle is fully
•
open. If operating with the valve closed, abnormal pressure will be imparted
to the high- or low-pressure side of the refrigerant circuit, giving damage to
the compressor, four-way valve, etc.
Determine the amount of additional refrigerant charge by using the formula,
•
and charge refrigerant additionally through the service port after completing
piping connection work.
After completing work, tighten the service port and cap securely so as not to
•
generate any gas leakage. (Refer to the table on the below for appropriate
tightening torque.)
Appropriate tightening torque:
Outer
diameter of
copper pipe
(mm [in])
Cap
(N·m/kg·cm)
Shaft
(N·m/kg·cm)
Size of
hexagonal
wrench
(mm)
Service port
(N·m/kg·cm)
ø9.52 [3/8]
15/150
6/60
4
12/120
ø12.7 [1/2]
20/200
9/90
4
ø15.88 [5/8]
25/250
15/150
6
ø19.05 [3/4]
25/250
30/300
8
ø25.4 [1]
25/250
30/300
8
ø28.58 [1-1/8]
25/250
-
-
16/160
Caution:
Keep the valve closed until refrigerant charging to the pipes to be
•
added on-site has been completed. Opening the valve before charging
the refrigerant may cause damage to the unit.
Do not use a leak detection additive.
•
[Fig. 10.2.3]
A
B
A
Example of closure materials (fi eld-supplied)
B
Fill the gap at the site
*When not attaching a low-pressure twinning pipe.
Make sure to seal-off the space around areas where the wires and refrigerant
pipes enter the unit to ensure that small animals, rainwater, or snow cannot
enter the unit through such openings and cause damage to the unit.
Caution:
Make sure to seal-off the openings for the pipe and wire retrieval.
Small animals, rainwater, or snow entering through the openings may
•
cause damage to the device.
10.3. Airtight test, evacuation, and
refrigerant charging
1
Airtight test
Perform with the valve of the outdoor unit closed, and pressurize the
connection piping and the indoor unit from the service port provided on the
valve of the outdoor unit. (Always pressurize from both the high-pressure
pipe and the low-pressure pipe service ports.)
[Fig. 10.3.1]
D
C
C
B
B
E
F
G
H
I
J
A
LO
HI
A
Nitrogen
gas
B
To indoor unit
C
System
analyzer
D
Lo
knob
E
Hi
knob
F
Valve
G
Low-pressure
pipe
H
High-pressure
pipe
I
Outdoor
unit
J
Service
port
Observe the following restrictions when conducting an air tightness test
to prevent negative effects on the refrigerating machine oil. Also, with
nonazeotropic refrigerant (R410A), gas leakage causes the composition to
change and affects performance. Therefore, perform the airtightness test
cautiously.
WT05788X01_GB_cs2j.indd 14
12/10/2009 11:25:00 AM
