Installation and Commissioning Guide - MultiElite 2 Split System
Doc. No. 9590-5009
Ver. 1 211221
16
Installation and Commissioning Guide
Multi Split System
10. Refrigerant Piping Connection
Outdoor Model
MRC-075CS-3
MRC-100CS-4
MRC-120CS-5
Minimum Field Pipe Length
(m)
3
3
3
Maximum length for all rooms
(m)
60
80
80
Maximum length for one indoor unit
(m)
30
35
35
Maximum Vertical
(m)
15
15
15
Liquid Pipe
mm (inch)
3 x 6.35 (1/4)
4 x 6.35 (1/4)
4 x 6.35 (1/4)
Gas Pipe
mm (inch)
3x 9.52 (3/8)
3 x 9.52 (3/8) + 1 x 12.7 (1/2)
3 x 9.52 (3/8) + 1 x 12.7 (1/2)
NOTE
Ensure that the length of the refrigerant pipe, the number of bends, and the drop height between the indoor and outdoor
units meets the requirements shown in above table.
Refrigerant Piping Connection Instructions:
1. Cut the connecting pipes according to required length.
2. Remove burrs in the pipe. Burrs can affect the air-tight seal of refrigerant piping connections.
3. Place flare nuts on both ends of pipe. Flare each end of connecting pipes.
Copper
pipe
Re
frige
rant
P
iping
Co
nn
ec
tion
do not
CAUTION
DO NOT
Connection Instructions –
Refrigerant Piping
DO NOT DEFORM PIPE
WHILE CUTTING
NOTE:
Flare nut
4. Connect the pipe to indoor and outdoor unit. Apply a thin coat of refrigeration oil to the flared end of the pipe.
Tighten the flare nuts using a spanner and torque wrench.
Unit tubing
Flare nut
Pipe
PIPING EXTENSION BEYOND FLARE FORM
Pipe
gauge
Tightening
torque
Flare dimension (A)
(Unit: mm/Inch)
Flare shape
Min.
Max.
NOTE:
CAUTION
R
efr
ige
ra
nt
P
ip
ing
C
onn
ec
tion
