Toshiba RAV-SP804ATP-E Installation Manual page 44

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.
Half union or packed valve Flare nut
Externally Internally
threaded side threaded side
Fix with wrench. Tighten with 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 crescent, the flare nut
cannot be tightened to the required tightening
torque.
On the other hand, use a single crescent to loosen
or tighten the flare nut of the valve on the liquid side.
Outer dia. of copper pipe Tightening torque
9.5 mm (dia.) 33 to 42 (3.3 to 4.2 kgf•m)
15.9 mm (dia.) 63 to 77 (6.3 to 7.7 kgf•m)
Cap
Piping valve
Loosened
Tightened
Flare nut
Valve at gas side
EN-85
CAUTION
1. Do not put the crescent wrench on the cap or cover.
The valve may break.
2. If applying excessive torque, the nut may break
according to some installation conditions.
NO GOOD
Cap
(Unit: N•m)
• 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.
Cover
Do not apply refrigerant oil to the flared surface.
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Refrigerant Pipe Length
Single
Allowable pipe length (m)
Total length L
50
Gas side
Cover
Ø15.9
Simultaneous twin
Allowable pipe length (m)
Total length Distributed pipes
• 1 + 2 •
• 1 + 3 •
Maximum Maximum
50
Pipe diameter (mm)
Main pipe
Gas side
Ø15.9
Height difference (Indoor-outdoor H) (m)
Indoor unit: Upper
30
Pipe diameter (mm)
Liquid side
Ø9.5
Figure of Single
Indoor Unit
Outdoor Unit
Height difference (m)
Indoor-outdoor H
Distributed pipes
2
• 3 – 2 Indoor unit:
3
Maximum Upper
15 10 30
Branching pipe
Liquid side Gas side Liquid side
Ø9.5 Ø12.7
Figure of Simultaneous twin
Indoor Unit
Indoor Unit
Distributor
Outdoor Unit
2 3
1
Outdoor unit: Lower
30
Number of bent portions
10 or less
Indoor-indoor
Outdoor unit:
Δ
( h)
Upper
30 0.5
Number of bent
portions
Ø6.4 10 or less
EN-86