Mitsubishi Electric CITY MULTI Installationshandbuch Seite 5

3. Refrigerant pipe and drain pipe
B Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Tightening
Pipe size
(mm)
P20/25/32/40 ODø6.35 (1/4")
ODø9.52 (3/8")
P50
P63/80 ODø9.52 (3/8")
ODø9.52 (3/8")
P100/125
* Use the provided flare nut for the following pipes: Liquid pipe of P50, P100, P125, and gas pipe of P50.
G
F
B,C
J
I
H
Fig. 3-3
Max. 20m
1.5–2m
A
B
K
B
E D
D
F
F
H
I
Fig. 3-4
A
B
C
L F
11
25 25 25
D E E
Fig. 3-5
R407C or R22
Gas pipe
Tightening
Pipe size
torque torque
(mm)
(N.m) (N.m)
14 - 18 ODø12.7 (1/2") 49 - 61
34 - 42* ODø15.88 (5/8") 68 - 82*
34 - 42 ODø15.88 (5/8") 68 - 82
34 - 42 ODø19.05 (3/4") 100 - 120*
A Refrigerant pipe and insulating ma-
terial
A
B Pipe cover (large)
C Pipe cover (small)
D Refrigerant pipe (gas)
E Refrigerant pipe (liquid)
F Band
G Cross-sectional view of connection
H Pipe
I Insulating material
J Squeeze
D
B
E
C
F
C
Max. 15cm
J
F
L
M
D
F
G
(mm)
G
C,K
H
I
K
R410A
Liquid pipe
Tightening
Pipe size
torque
(mm)
(N.m)
ODø6.35 (1/4") 14 - 18
ODø6.35 (1/4") 34 - 42
ODø9.52 (3/8") 34 - 42
ODø9.52 (3/8") 34 - 42
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 from the ends of the pipe cover.)
• 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.)
3.4. Drainage piping work (Fig. 3-4)
• Use VP25 (O.D. ø32 (1-1/4") PVC TUBE) for drain piping and provide 1/100 or
more downward slope.
• Be sure to connect the piping joints using a polyvinyl type adhesive.
• Observe the figure for piping work.
• Use the included drain hose to change the extraction direction.
1 Correct piping
2 Wrong piping
A Insulation (9 mm or more)
B Downward slope (1/100 or more)
C Support metal
K Air bleeder
L Raised
M Odor trap
Grouped piping
D O. D. ø32 PVC TUBE
E Make it as large as possible
F Indoor unit
G Make the piping size large for grouped piping.
H Downward slope (1/100 or more)
I O. D. ø38 PVC TUBE for grouped piping.
(9 mm or more insulation)
J Up to 85 cm
1. Connect the drain socket (supplied with the unit) to the drain port. (Fig. 3-5)
(Affix the tube using PVC adhesive then secure it with a band.)
2. Install a locally purchased drain pipe (PVC pipe, O.D. ø32).
(Affix the pipe using PVC adhesive then secure it with a band.)
3. Insulate the tube and pipe. (PVC pipe, O.D. ø32 and socket)
4. Check that drain flows smoothly.
5. Insulate the drain port with insulating material, then secure the material with a
band. (Both insulating material and band are supplied with the unit.)
A Unit
B Insulating material
C Band (large)
D Drain port (transparent)
J
E Insertion margin
F Matching
G Drain pipe (O.D. ø32 PVC TUBE)
H Insulating material (purchased locally)
I Transparent PVC pipe
J O.D. ø32 PVC TUBE (Slope 1/100 or more)
K Band (small)
L Drain socket
Gas pipe
Tightening Liquid
Pipe size
torque
pipe
(mm)
(N.m) (mm)
ODø12.7 (1/2") 49 - 61
ODø12.7 (1/2") 68 - 82
ODø15.88 (5/8") 68 - 82
ODø15.88 (5/8") 100 - 120
Flare nut O.D.
Gas
pipe
(mm)
17 26
22 29
22 29
22 36
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