Installing The Refrigerant Piping - Mitsubishi Electric PKA-RP-HAL Installation Manual

4. Installing the refrigerant piping

45±2°
Fig. 4-1
A Flare cutting dimensions
Copper pipe O.D. Flare dimensions
(mm) øA dimensions (mm)
ø6.35
ø12.7 16.2 - 16.6
■ PKA-RP·HAL
4.2. Indoor unit
Refrigerant and Drainage Piping Sizes
Model
Item
Liquid
Refrigerant piping
Gas
Drainage piping
B
Fig. 4-3
6
8.7 - 9.1
Fig. 4-2
PKA-RP35, RP50HAL
ODø6.35 (1/4")
ODø12.7 (1/2")
ODø16
A
4.1. Connecting pipes (Fig. 4-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 100 °C or
more, thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam
insulation materials (specific gravity of 0.03, thickness of 9 mm or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before
tightening flare nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections.
Insulate carefully.
B
Flare nut tightening torque
C
Do not apply refrigerating machine oil to the screw portions.
(This will make the flare nuts more apt to loosen.)
D
Be certain to use the flare nuts that are attached to the main unit.
(Use of commercially-available products may result in cracking.)
Copper pipe O.D.
(mm)
ø6.35
ø12.7
Warning:
When installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.
( )
( )
Fig. 4-2
4.3. Positioning refrigerant and drain piping (Fig. 4-2)
■ PKA-RP·HAL
A Gas pipe
* Indicates the condition with accessories mounted.
B Liquid pipe
C Drain hose (Effective length: 400)
D Left-side piping knockout hole
E Right-side piping knockout hole
F Lower piping knockout hole
G Mount board 1
4.4. Refrigerant piping (Fig. 4-3)
Indoor unit
1. Remove the flare nut and cap of the indoor unit.
2. Make a flare for the liquid pipe and gas pipe and apply refrigerating machine oil
(available from your local supplier) to the flare sheet surface.
3. Quickly connect the on site cooling pipes to the unit.
4. Wrap the pipe cover that is attached to the gas pipe and make sure that the
connection join is not visible.
5. Wrap the pipe cover of the unit's liquid pipe and make sure that it covers the
insulation material of the on site liquid pipe.
6. The portion where the insulation material is joined is sealed by taping.
A Site-side refrigerant piping
B Unit side refrigerant piping
Flare nut O.D. Tightening torque
(mm) (N·m)
17 14 - 18
28 49 - 61