Refrigerant Pipe And Drain Pipe Specifications; Refrigerant Pipe, Drain Pipe And Filling Port; Request For Refrigerant Piping Connection; Connecting Refrigerant Pipes And Drain Pipes - Mitsubishi Electric CITY MULTI PDFY-NMU-A Installation Manual

Air-conditioners for building application indoor unit
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2 If the unit is used on the highest story of a building and under conditions of
high temperature and humidity, it is necessary to use pipe size and insulating
material's thickness more than those given in the table above.
3 If there are customer's specifications, simply follow them.
6.1. Refrigerant pipe and drain pipe specifi-
cations
Model
Item
Liquid pipe ø6.35 (1/4 in)
Refrigerant pipe
(Flare connection)
Gas pipe
ø12.7 (1/2 in)
Drain pipe

6.3. Request for refrigerant piping connection

Description of parts to be used
No.
Work procedures
Mount the provided pipe insula-
tion (1) on the liquid pipe of the
refrigerant piping, and then mount
the flare insulation (2) on the gas
pipe.
1
Fixing of insulated pipe
2
Fixing of flare insulation
3
[Fig. 6.3.1] (P.3)
A "0-0 gas" mark
C "OUTER" mark
E Refrigerant piping (gas)
G Field refrigerant piping
I Insulation material
K Pull in this direction.
M Flare
O Move to the original position.
[Fig. 6.3.2] (P.3)
(figure showing the flare insulation)
A Field refrigerant piping
C Unit body plate
E INNER
G Provided flare insulation (2)

7. Connecting refrigerant pipes and drain pipes

7.1. Refrigerant piping work

This piping work must be done in accordance with the installation manuals for both
outdoor unit and BC controller (simultaneous cooling and heating series R2).
Series R2 is designed to operate in a system that the refrigerant pipe from an
outdoor unit is received by BC controller and branches at the BC controller to
connect between indoor units.
For constraints on pipe length and allowable difference of elevation, refer to
the outdoor unit manual.
The method of pipe connection is flare connection.
8
10 · 16
24 · 32
40 · 48
ø9.52 (3/8 in)
ø15.88 (5/8 in)
ø19.05 (3/4 in)
VP-25
Detail of work
"INNER" and "OUTER" are marked on the in-
side of the flare insulation. Mount the portion
marked "INNER" near the unit body and the
portion marked "OUTER" on the field piping
side.
• Fasten the insulated pipe with the insula-
tion tape.
• Firmly secure the insulation with the pro-
vided tie band (4) at the position indicated
on the drawing.
• Fasten the flare insulation with the provided
tape (3).
• Fasten with the provided tie band (4) at the
position indicated on the drawing.
B "INNER" mark
D Flare insulation (2)
F Refrigerant piping (liquid)
H Pipe insulation (1)
J Flare
L Insulation material
N There must be no gap.
B There must be no gap.
D OUTER
F Unit body
6.2. Refrigerant pipe, drain pipe and filling
port
[Fig. 6.2.1] (P.3)
A
Model name
10 · 32
126
40 · 48
121
A
Model name
10 · 32
4-31/32
40 · 48
4-25/32
F Refrigerant piping (liquid pipe)
H Drain piping (when the optional drain-up mechanism is used)
I Drain hole (natural drain outlet)
J Feed-water inlet for checking drain water
K Control box
Item to be observed
• Using the flare insulation of a different model may
result in condensation forming. Check the model
name on the insulation and be sure to use the cor-
rect one.
• To prevent a gap from forming near the unit's side
plate, be sure that the flare insulation firmly con-
tacts the unit's side plate before mounting.
• Incorrectly mounting the "INNER" and "OUTER"
sides of the insulation may result in condensation
forming.
Seal the slit securely so that there are no openings.
Be sure to mount the insulation so that the slit is on
the top.
Seal the slit securely so that there are no openings.
Be sure to mount the insulation so that the slit is on
the top.
[Fig. 6.3.3] (P.3)
A Tape (3)
C Provided tie band (4)
Notes:
*1
Insert the flare nut into the field refrigerant piping. Pull the insulation
material back at the area where it will be flared, then return it to its
original position after performing the flare work.
Exposing copper piping may result in condensation forming. Be ex-
tremely careful when performing this operation.
*2
There must be no gap.
*3, *4 There must be no gap. Slit should be on the top.
Cautions on refrigerant piping
s s s s s Be sure to use non-oxidative brazing for brazing to ensure that no for-
eign matter or moisture enter into the pipe.
s s s s s Be sure to apply refrigerating machine oil over the flare connection seat-
ing surface and tighten the connection using a double spanner.
s s s s s Provide a metal brace to support the refrigerant pipe so that no load is
imparted to the indoor unit end pipe. This metal brace should be pro-
vided 50 cm [19-11/16 in] away from the indoor unit's flare connection.
Warning:
When installing and moving the unit, do not charge it with refrigerant other
than the refrigerant (R22) specified on the unit.
(mm)
B
C
D
172
265
111
206
305
151
(in)
B
C
D
6-25/32
10-7/16
4-3/8
8-1/8
12-1/32
5-31/32
G Refrigerant piping (gas pipe)
Reference drawing
Fig. 6.3.1 (P.3)
Fig. 6.3.2 (P.3)
(Note *2)
Fig. 6.3.2 (P.3)
Fig. 6.3.3 (P.3)
(Note *3)
Fig. 6.3.3 (P.3)
(Note *4)
B Fasten with tape.

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