Toshiba RAV-GM2241AT8-E1 Installation Manual page 16

CAUTION
• Do not put the crescent wrench on the cap or cover.
The valve may break.
• If applying excessive torque, the nut may break
according to some installation conditions.
Incorrect Cover
Cap
• After the installation work, be sure to check for gas
leaks of the pipe connections with nitrogen.
• 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.
29-EN
 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 The ends of the branch
pipes form a line pipes form a line
perpendicular to the perpendicular to the
ground. ground.
Both the collecting pipe
and branch pipes form
Both the collecting pipe
a line parallel to the
and branch pipes form
ground.
a line parallel to the
ground.
Branch pipe
Branch pipe
Collecting pipe Collection area
Gas side Liquid side
Inclined
Incorrect
Make sure that the pipes are installed
level after branching.
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)
500 mm or
more
500 mm or
more
– 15 –
 Refrigerant pipe length
Single
\
Allowable pipe length (m)
Outdoor unit Total length ℓ
Minimum
GM224 5
GM280 5
Pipe diameter (mm)
Outdoor unit
Gas side
GM224 Dia. 28.6
GM280 Dia. 28.6
Simultaneous twin
Allowable pipe length (m)
Total length Branch piping
Outdoor unit
• ℓ1 + ℓ2 • ℓ2
• ℓ1 + ℓ3 • ℓ3
Maximum Maximum
GM224 100
GM280 100
Outdoor unit Main pipe
Gas side
GM224 Dia. 28.6
GM280 Dia. 28.6
Height difference (m)
Indoor-outdoor H
Maximum Indoor unit: Upper
100 30
100 30
Number of bent portions
Liquid side
Dia. 12.7 10 or less
Dia. 12.7 10 or less
Figure of Single
Indoor Unit
Outdoor Unit
Height difference (m)
Branch piping Indoor-outdoor H
• ℓ3 – ℓ2
Indoor unit: Outdoor unit:
Upper Upper
Maximum
20 10 30 30
20 10 30 30
Pipe diameter (mm)
Branch piping
Liquid side Gas side Liquid side
Dia. 12.7 Dia. 15.9 Dia. 9.5
Dia. 12.7 Dia. 15.9 Dia. 9.5
Figure of Simultaneous twin
Indoor Unit
Indoor Unit
Outdoor Unit
2
3
1
Outdoor unit: Upper
30
30
Indoor-indoor
(Δh)
0.5
0.5
Number of bent
portions
10 or less
10 or less
30-EN