Installation Of Outdoor Unit; Connection Of Refrigerant Pipings - Mitsubishi Heavy Industries SRK20ZG-S Tech Manual

5.3 Installation of outdoor unit

(1) Installation of outdoor unit
(a) Make sure that the unit is stable in installation. Fix the unit to stable base.
(b) When installing the unit at a higher place or where it could be toppled by strong winds, secure the unit firmly with foundation
bolts, wire, etc.
(c) Perform wiring, making wire terminal numbers conform to terminal numbers of indoor nuit terminal block.
(d) Connect using ground screw located near
(e) In areas where the temperatures drop below 0ºC for serveral continuous days, do not install a drain elbow.
(Water dischage could stop due to freezing.)

5.4 Connection of refrigerant pipings

(1) Preparation
Keep the openings of the pipes covered with tapes etc. to prevent dust, sand, etc. from entering them.
(a) Indoor unit side
(Do not
turn)
¡ Remove the flared nuts.
(on both liquid and gas sides)
(2) Connection of refrigerant piping
(a) Indoor unit side
• Connect firmly gas and liquid side
pipings by Torque wrench.
Spanner
for fixing
the piping)
Torque
wrench
• Specified torquing value:
Liquid side (ø6.35)
Gas side (ø9.52)
Gas side (ø12.7)
• Always use a Torque wrench and back up spanner to tighten the flare nut.
mark.
(b) Outdoor unit side
Remove
¡ Remove the flared nuts.
(on both liquid and gas sides)
: 14~18N·m (1.4~1.8kgf·m)
: 34~42N·m (3.4~4.2kgf·m)
: 49~61N·m (4.9~6.1kgf·m)
Press
Remove
(b) Outdoor unit side
• Connect firmly gas and liquid side
pipings by Torque wrench.
• Specified torquing value:
Liquid side (ø6.35)
Gas side (ø9.52)
Gas side (ø12.7)
• Use one more spanner to fix the valve.
29
- -
Dimension A
Liquid side
(ø6.35): 9.1 mm
Gas side
(ø9.52): 13.2 mm
(ø12.7): 16.6 mm
¡ Install the removed flared nuts to the pipes to be
connected, then flare the pipes.
: 14~18N·m (1.4~1.8kgf·m)
: 34~42N·m (3.4~4.2kgf·m)
: 49~61N·m (4.9~6.1kgf·m)