Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 1057

(3) Specification of unit piping (Pipe diameter. Connecting method)
(a) Unit
1) Outdoor unit
Item
Model
FDCP2001HKXRE2
FDCP2501HKXRE2
2) Indoor unit
Item
Model
22, 28 type
36 type
45 type
56, 71, 90 type
112, 140 type
3) Tightening torque
(b) Refrigerant piping connection
1) Pipes can be connected in four directions, but electric wire can be done in five directions.
2) Select the optimum connecting direction taking into account the installation conditions of outdoor unit and the
positional relations with indoor units.
3) For connections to the operation valves and attendant piping, connect gas pipes first, then liquid pipes.
• Remove the seal on the flange of the gas side service valve.
• Place the accessory packing between the flanges of the gas side service valve and of the attendant piping for gas before
connection.
Gas line
Pipe diameter Connecting method
φ25.4 (1")
φ28.58 (1 1/8")
Gas line
Pipe diameter Connecting method
φ12.7 (1/2")
φ12.7 (1/2")
φ12.7 (1/2")
φ15.88 (5/8")
φ19.05 (3/4")
φ6.35 (1/4") Flare nut
φ9.52 (3/8") Flare nut
φ12.7 (1/2") Flare nut
φ15.88 (5/8") Flare nut
φ19.05 (3/4") Flare nut
Gas side flange bolt
Pipe diameter
φ12.7 (1/2")
Brazing
φ12.7 (1/2")
Pipe diameter
φ6.35 (1/4")
φ6.35 (1/4")
φ6.35 (1/4")
Flare
φ9.52 (3/8")
φ9.52 (3/8")
16~20N · m (1.6 ~ 2.0 kg·m)
40~50N · m (4 ~ 5 kg·m)
40~50N · m (4 ~ 5 kg·m)
90~120N · m (9 ~ 12 kg·m)
100~140N · m (10 ~ 14 kg·m)
30~40N · m (3 ~ 4 kg·m)
FDC-HKXR
Unit: mm (in)
Liquid line
Connecting method
Brazing
Unit: mm (in)
Liquid line
Connecting method
Flare
1055