Mitsubishi Electric City Multy PCFY-NKMU, Руководство по установке

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3. Refrigerant pipe and drain pipe
3.1. Refrigerant and drainage piping locations of indoor
unit (Fig. 3-1)
A
Drain pipe
B
Ceiling
C
Grille
D
Refrigerant pipe (liquid)
E
Refrigerant pipe (gas)
F
Main unit
Fig. 3-1
A
Flare cutting dimensions
Fig. 3-2
3.2. Connecting pipes (Fig. 3-2)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 100 °C, 212 °F
or more, thickness of 12 mm (15/32 inch) or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam insula-
tion materials (specific gravity of 0.03, thickness of 9 mm (11/32 inch) 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.
Copper pipe O.D.
(mm, inch)
Flare dimensions
øA dimensions (mm, inch)
ø6.35, 1/4 8.7 to 9.1, 11/32 to 23/64
ø12.7, 1/2 16.2 to 16.6, 5/8 to 21/32
øA
90°
±0.5°
45° ±2°
R1/64
- R1/32
Fig. 3-3
B
Refrigerant pipe sizes & Flare nut tightening torque
C
Apply refrigerating machine oil over the entire flare seat surface.
3.3. Indoor unit (Fig. 3-3)
Heat insulation for refrigerant pipes:
1
Wrap the enclosed large-sized pipe cover around the gas pipe, making sure that
the end of the pipe cover touches the side of the unit.
2
Wrap the enclosed small-sized pipe cover around the liquid pipe, making sure
that the end of the pipe cover touches the side of the unit.
3
Secure both ends of each pipe cover with the enclosed bands. (Attach the bands
20 mm (25/32 inch) from the ends of the pipe cover.)
Make sure that the slit in the pipe cover is facing upward when it is installed.
• After connecting the refrigerant piping to the indoor unit, be sure to test the pipe
connections for gas leakage with nitrogen gas. (Check that there is no refrigerant
leakage from the refrigerant piping to the indoor unit.)
A
Refrigerant pipe and insulating material
(Procure locally)
B
Pipe cover (large) (Accessory)
C
Pipe cover (small) (Accessory)
D
Refrigerant pipe (gas)
E
Refrigerant pipe (liquid)
F
Band (Accessory)
G
Cross-sectional view of connection
H
Refrigerant pipe
I
Insulating material
J
Squeeze
R410A
Flare nut O.D.
Liquid pipe Gas pipe
Pipe size
(mm, inch)
Tightening torque
(N ∙ m, ft ∙ lbs)
Pipe size
(mm, inch)
Tightening torque
(N ∙ m, ft ∙ lbs)
Liquid pipe
(mm, inch)
Gas pipe
(mm, inch)
P05/08/12/15/18 ODø6.35, 1/4 14 to 18, 10 to 13 ODø12.7, 1/2 49 to 61, 36 to 45 17, 21/32 26, 1-1/32
3-1/16
(gas)
2-15/32
(liquid)
A
F
F
B
D
E
C
(inch)
1/4 7-23/32 7-23/32
7-13/32
5-1/4
2-23/32
2-17/32
A
C
E
F
D
B
Warning:
When installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.
BH79A348H01_en.indd 5 9/25/2017 10:55:01 AM