Installation manual
7
U-5~18MX4XPQ
Urban Multi air conditioner
4PW28163-1
Prohibited patterns : change to pattern 1 or 2.
■
To avoid the risk of oil retention to the outmost outdoor unit,
always connect the stop valve and the piping between
outdoor units as shown in the 4 correct possibilities of the
figure below.
Prohibited patterns change to pattern 1 or 2.
Change to configuration as in figures below
Correct configuration
■
If the piping length between the outdoor units exceeds 2 m,
create a rise of 200 mm or more in the gas line within a
length of 2 m from the kit.
-
If
≤
2 m
-
If
≥
2 m
5
Branching the refrigerant piping
■
For installation of the refrigerant branching kit, refer to the
installation manual delivered with the kit.
(See figure 13)
Follow the conditions listed below:
- Mount the refnet joint so that it branches either
horizontally or vertically.
- Mount the refnet header so that it branches horizontally.
■
Installation of the multi connection piping kit
(See figure 17)
- 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 500 mm. Only
if a straight field piping of more than 120 mm is
connected, more than 500 mm of straight section can be
ensured.
- Improper installation may lead to malfunction of the
outdoor unit.
6
Piping length restrictions
Make sure to perform the piping installation within the range of
the maximum allowable pipe length, allowable level difference
and allowable length after branching as indicated in
"6.6. Example of connection" on page 8.
6.5.
Protection against contamination when
installing pipes
-
Take measures to prevent foreign materials like moisture and
contamination from mixing into the system.
-
Great caution is needed when passing copper tubes through
walls.
-
Block all gaps in the holes for passing out piping and wiring
using sealing material (field supply). (The capacity of the unit
will drop and small animals may enter the machine.)
Example: passing piping out through the front
1
1
2
2
1
To indoor unit
2
Piping between outdoor units
1
1
2
2
2
2
1
To indoor unit
2
Oil collects to the outmost outdoor unit.
1
1
2
2
1
To indoor unit
2
Oil collects to the outmost outdoor unit when the system
stops.
1
1
≥
200 mm
1
To indoor unit
1
≤
2 m
2
1
To indoor unit
2
Piping between outdoor units
1
Horizontal surface
Installation period
Protection method
More than a month
Pinch the pipe
Less than a month
Pinch or tape the pipe
Regardless of the period
After all the piping has been connected, make sure there is
no gas leak. Use nitrogen to perform a gas leak check.
1
2
≤
2 m
≥
2 m
≥
200 mm
1
To indoor unit
2
Piping between outdoor units
1
2
3
1
Plug the areas marked with "
".
(When the piping is routed from the
front panel.)
2
Gas side piping
3
Liquid side piping
Summary of Contents for U-5MX4XPQ
Page 33: ...4PW28163 1...
