Refrigerant Pipe And Drain Pipe - Mitsubishi Electric City Multi Série Manuel D'installation

3. Refrigerant pipe and drain pipe

F
Fig. 3-1
B
Liquid pipe
Pipe size
(mm, inch)
A
E
1/4 7-23/32 7-23/32
D
C
Fig. 3-2
Tightening torque Pipe size
(N m, ft lbs) (mm, inch)
B
F
C
D
F
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
Fig. 3-3
3.1. Refrigerant and drainage piping locations of indoor
(inch)
unit (Fig. 3-1)
A
A
Drain pipe
B
Ceiling
C
Grille
D
Refrigerant pipe (liquid)
E
Refrigerant pipe (gas)
F
Main unit
B
3.2. Connecting pipes (Fig. 3-2)
flare nut.
carefully.
Warning:
When installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.
A
Flare cutting dimensions
Copper pipe O.D.
(mm, inch)
Flare nut O.D.
Gas pipe
Tightening torque Liquid pipe
(N m, ft lbs) (mm, inch)
49 to 61, 36 to 45
C
Apply refrigerating machine oil over the entire flare seat surface.
E
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
Make sure that the slit in the pipe cover is facing upward when it is installed.
connections for gas leakage with nitrogen gas. (Check that there is no refrigerant
leakage from the refrigerant piping to the indoor unit.)
Flare dimensions
øA dimensions (mm, inch)
Gas pipe
(mm, inch)
-