Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 347

b) Installation where the area with strong winds.
Install the unit so that the air outlet section of the unit must not be faced toward
wind direction.
(c) Installation of outdoor unit
1) Installation
Fix the unit in a proper way according to the condition of a place where it is installed by referring to the following.
a) Concrete foundation
Anchor bolt
Note (1) Give enough room for the concrete
foundation to fix by anchor bolts.
Install the unit so that the angle of indination must be less than 3 degrees.
(2) Refrigerant piping
(a) Outline of piping
(b) Piping size
Model
φ15.88 × 1.0 mm
Gas piping
φ9.52 × 0.8 mm
Liquid piping
• Install the removed flared nuts to the pipes to be connected, then flare the pipes.
(c) Limitations for one way piping length and vertical height difference.
•
One way piping length: Less than 30 m
•
Vertical height difference: Less than 15 m
Precautions for refrigerant piping
• Do not twist or crush piping.
• Be sure that no dust is mixed in piping.
• Bend piping with as wide angle as possible.
•
Keep insulation both gas and liquid piping.
•
Check flare-connected area for gas leakage.
(d) Heat insulation for refrigerant piping
(i) The gas piping and liquid piping must be insulated
against heat and condensation by heat insulation
material.
1) Condensation can form on the gas line during cooling op-
eration and drain off, causing leakage problems. Also,
people can be burned by the high temperatures on the sur-
face of the piping due to the flow of discharge gas during
heating. To prevent this, the piping should be wrapped in
insulating material.
2) Insulate the flare connection sections of the indoor unit
with insulating material (pipe covering). (Perform this
for both gas and liquid lines.)
3) Wrap the gas and liquid piping with insulation, making
sure that no gaps can form inside. Bundle the piping and
wires together and wrap with exterior tape.
Unit
Concrete foundation
To fix by bolt
Flare connection
Gas pipe
Indoor
unit
Liquid
pipe
FDC306 FDC406, 506
φ19.05 × 1.0 mm
φ9.52 × 0.8 mm
b) Foundation
anchor
Concrete foundation
Anchor bolt
Note (1) Place the concrete foundation deep enough.
Check joint
Service valve
Outdoor
unit
Flare connection
Indoor/outdoor
connection wire
Liquid piping
Use a material with good heat transfer resistance
qualities (120 °C or more)
FDT ( N ) -H
Unit
Exterior tape
Gas piping
Insulating material
345