Guidelines For Handling Stop Valve - Daikin REYQ72TTJU Installation Manual

• If the piping length between the outdoor units exceeds 6.5 ft. (2 m),
create a rise of 8 in. (200 mm) or more in the suction gas and High/
Low pressure gas line within a length of 6.5 ft. (2 m) from the kit.
If ≤ 6.5 ft. (2 m)
1
If > 6.5 ft. (2 m)
b
1
a
1 To indoor unit
2 Piping between outdoor units
a ≤ 6.5 ft. (2 m)
b ≥ 8 in. (200 mm)
c > 6.5 ft. (2 m)
NOTE
There are restrictions on the refrigerant pipe connection order be-
tween outdoor units during installation in case of a multiple outdoor
unit system. Install according to following restrictions. The capacities
of outdoor units A, B and C must fulfill the following restriction condi-
tions: A≥B≥C.
1 To indoor unit
A B C
2 Outdoor unit multi connecting
3 Outdoor unit multi connecting
1 2 3
8 .2 .6 . Branching the refrigerant piping
1 For installation of the refrigerant branching kit, refer to the installa-
tion manual delivered with the kit.
1
A
Vertical
1
B
1 Horizontal surface
• Mount the REFNET joint so that it branches either horizontally or
vertically.
• Mount the REFNET header so that it branches horizontally.
17
2
a
b
2
c a c
piping kit (first branch)
piping kit (second branch)
Horizontal
2 Installation of the multi connection piping kit.
A
1
B
1
C > 4-3/4 in. (120 mm)
D > 19-11/16 in. (500 mm)
• Install the joints horizontally, so that the caution label (1) attached to
the joint comes to the top.
- Do not tilt the joint more than 15° (see view A).
- Do not install the joint vertically (see view B).
• Make sure that the total length of the piping connected to the joint
is absolute straight for more than 19-11/16 in. (500 mm). Only if a
straight field piping of more than 4-3/4 in. (120 mm) is connected,
more than 19-11/16 in. (500 mm) of straight section can be ensured.
• Improper installation may lead to malfunction of the outdoor unit.

8 .3 . Guidelines for handling stop valve

8 .3 . 1 . Cautions on handling the stop valve
• Make sure to keep all stop valves open during operation.
• The figure below shows the name of each part required in handling
the stop valve.
• The stop valves are factory closed.
• When handle the stop valves, be careful not to damage the port
pipes around (refer to P22).
1
2
3
4
1 2
5 4 3
1 Service port and service port
cover
2 Stop valve
3 Field piping connection
4 Stop valve cover
1 Service port
2 Cap
3 Hexagon hole
4 Shaft
5 Seal
3P362438-3H English