Johnson Controls (H, Engineering Manual, Page: 77 / 124

OUTDOOR UNITS
TC-16006
2-55
(1) Piping length between piping connection kit 1 and each outdoor unit should be
L
A
< L
B
< L
C
< 32.8 ft (10m).
Maintain a straight-line distance of 19-11/16 inch (500mm) or more for piping after the piping
connection kit 1.
Select the pipe size according to Section 2.14.6 “Piping Size between Outdoor Units”.
For refrigerant piping between multiple outdoor units, use the optional piping connection kit.
The arrangement for outdoor units should be determined depending on the piping direction when the
refrigerant piping work and installation work are planned. When the outdoor unit is installed, perform the
installation work according to the following restrictions.
(2) Place the piping connection kit lower than the outdoor
unit piping connection.
When the piping connection kit is installed higher than
the outdoor unit piping connection, maintain a maximum
clearance of 11-13/16 inch (300mm) between the
piping connection kit and the bottom of the outdoor unit.
Also, install an oil trap (minimum 7-7/8 inch (200mm))
between the piping connection kit and the outdoor unit.
2.14.5 Piping Work between Outdoor Units
Outdoor
Unit
B
Outdoor
Unit
A
Outdoor
Unit
C
Piping Connection Kit 1 Piping Connection Kit 2
L L
C A B
L
Indoor Unit Side
Outdoor
Unit
B
Outdoor
Unit
A
Outdoor
Unit
C
Upstream Side
Piping Connection Kit 1 Piping Connection Kit 2
Indoor Unit Side
Max. lift difference
between outdoor
units is 3-15/16 inch. Maintain a straight-line
distance of 19-11/16 inch
or more for piping after
the piping connection kit.
Indoor Unit Side
Indoor Unit Side
The refrigerant oil is stagnated to the unit stopped.
Indoor Unit Side
Max.
11-13/16 inch
Oil Trap
Min. 7-7/8 inch Oil Trap
Min. 7-7/8 inch Oil Trap
Min. 7-7/8 inch
Max.
11-13/16 inch Max.
11-13/16 inch
< Side View of Outdoor Unit >
Pull out pipes from
bottom base hole.
No trap.
Provide
a trap.
Pull out pipes from
bottom base hole.
< Side View of Outdoor Unit >
No trap is
required.