– 9 –
Outdoor Unit
Installation Manual
Outdoor Unit
Installation Manual
Tightening of connecting part
1. Align the centers of the connecting pipes and fully tighten the flare nut with your fingers. Then fix the nut with a
wrench as shown in the figure and tighten it with a torque wrench.
2. As shown in the figure, be sure to use two wrenches to loosen or tighten the flare nut of the valve on the gas
side. If you use a single wrench, the flare nut cannot be tightened to the required tightening torque.
On the other hand, use a single wrench to loosen or tighten the flare nut of the valve on the liquid side.
CAUTION
1.Do not put the wrench on the cap or cover.
The valve may break.
2.If applying excessive torque, the nut may break according to some installation conditions.
• After the installation work, be sure to check for gas leaks of the pipe connections with nitrogen.
• Pressure of R410A is higher than that of R22 (Approx. 1.6 times).
Therefore, using a torque wrench, tighten the flare pipe connecting sections that connect the indoor / outdoor
units at the specified tightening torque.
Incomplete connections may cause not only a gas leak, but also trouble with the refrigeration cycle.
Do not apply refrigerant oil to the flared surface.
Internally
threaded side
Externally
threaded side
Flare nut
Tighten with torque
wrench.
Fix with wrench.
Half union or packed valve
Piping valve
Cap
Cover
Flare nut
Loosened
Valve at gas side
Tightened
Cap
Cover
NO GOOD
Coupling size of brazed pipe
(Unit: mm)
Connected section
External size
Internal size
Standard outer dia.
of connected
copper pipe
Connected section
Min. thickness
of coupling
External size
Internal size
Min. depth of
insertion
Oval value
Standard outer dia.
(Allowable difference)
C
F
K
G
6.35
6.35 (±0.03)
6.45 (
)
7
6
0.06 or less
0.50
9.52
9.52 (±0.03)
9.62 (
)
8
7
0.08 or less
0.60
12.70
12.70 (±0.03)
12.81 (
)
9
8
0.10 or less
0.70
15.88
15.88 (±0.03)
16.00 (
)
9
8
0.13 or less
0.80
19.05
19.05 (±0.03)
19.19 (
)
11
10
0.15 or less
0.80
22.22
22.22 (±0.03)
22.36 (
)
11
10
0.16 or less
0.82
K
ØC
G
ØF
+0.04
-0.02
+0.04
-0.02
+0.04
-0.02
+0.04
-0.02
+0.03
-0.03
+0.03
-0.03
17-EN
18-EN
+00EH99883601_00Ta.book Page 9 Thursday, September 8, 2011 4:34 PM
