Toshiba RAV-SM2244AT7 Installationshandbuch Seite 13

Digital Inverter
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
Externally
threaded side
Fix with 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
9.5 mm (diam.)
12.7 mm (diam.)
15.9 mm (diam.)
19.1 mm (diam.)
Cap
Loosened
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
Flare nut
Internally threaded
side
Tighten with torque wrench.
Tightening torque
33 to 42 (3.3 to 4.2 kgf•m)
50 to 62 (5.0 to 6.2 kgf•m)
68 to 82 (6.8 to 8.2 kgf•m)
100 to 120 (10.0 to 12 kgf•m)
Cover
Piping valve
Tightened
Flare nut
Valve at gas side
Cover
Cap
• 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.
Branch Pipe
Carry out the refrigerant piping work using the branch pipe kit
which is purchased separately.
Branch pipe installation
The ends of the branch pipes
form a line perpendicular to
the ground.
(Unit: N•m)
Branch pipe
Gas side
NO GOOD
Length of straight sections on main pipe side of
branch pipe
Provide a straight section with a length of at least 500 mm on
the main pipe side of the branch pipe. (Same for both liquid
side and gas side)
12
Both the collecting
pipe and branch
pipes form a line
parallel to the ground.
Collecting pipe
Inclined
Make sure that the pipes are
installed level after branching.
500 mm
or more
The ends of the branch
pipes form a line
perpendicular to the ground.
Both the collecting
pipe and branch
pipes form a line
parallel to the ground.
Branch pipe
Collection area
Liquid side
500 mm
or more
EN