Refrigerant Pipe And Drain Pipe Specifications; Refrigerant Pipe , Drain Pipe And Filling Port - Mitsubishi Electric CITY MULTI Serie Manual De Instalación

3. Change the installation fitting on the back side of the control box as shown in
Fig. 5.3.3.
4. Install the control box on the outside of the indoor unit in accordance with the
arrows. (Fig. 5.3.4)
5. Install the intake sensor removed in (2) in the sensor mounting hole shown in
Fig. 5.3.4 Also, install the piping sensor connectors (CN21, CN29), LEV con-
nector (CN60) and fan connector (FAN1) in the control box.
[Fig. 5.3.1] (P.3)
A Control box cover
[Fig. 5.3.2] (P.3)
B Intake sensor
[Fig. 5.3.3] (P.3)
C Installation fitting
F Control box

6. Refrigerant pipe and drain pipe specifications

To avoid dew drops, provide sufficient antisweating and insulating work to the re-
frigerant and drain pipes.
When using commercially available refrigerant pipes, be sure to wind commer-
cially available insulating material (with a heat-resisting temperature of more than
100°C and thickness given below) onto both liquid and gas pipes.
Be also sure to wind commercially available insulating material (with a form
polyethylene's specific gravity of 0.03 and thickness given below) onto all pipes
which pass through rooms.
6.1. Refrigerant pipe and drain pipe specifications
[Fig. 6.1.1] (P.3)
A Flare cutting dimensions
B Refrigerant pipe sizes & Flare nut tightening torque
C Apply refrigerating machine oil over the entire flare seat surface
A Flare cutting dimensions
Copper pipe O.D. (mm)
B Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Tightening
Pipe size
P20/25/32/40 O.D.ø6.35 (1/4") 14 – 18
P50 O.D.ø6.35 (1/4") 34 – 42
P63/71/80 O.D.ø9.52 (3/8") 34 – 42
P100/125 O.D.ø9.52 (3/8") 34 – 42
* Use the provided flare nut for the following pipes: Liquid pipe of P50, P100, P125, P140 and gas pipe of P50.

6.2. Refrigerant pipe , drain pipe and filling port

[Fig. 6.2.1] (P.3)
Model name
A
20 - 80 126
100 · 125 121
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
M Through hole for transmission
8
D Front E cover side
G cross section
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
R410A
Gas pipe
Tightening
torque Pipe size torque
(N·m) (N·m)
O.D.ø12.7 (1/2") 49 – 61
O.D.ø12.7 (1/2") 68 – 82
O.D.ø15.88 (5/8") 68 – 82
O.D.ø15.88 (5/8") 100 – 120
B C D
172 265 111
206 305 151
G Refrigerant piping (gas pipe)
L Through hole for power supply
[Fig. 5.3.4] (P.3)
H Sensor mounting hole
Changing the rear panel installation position
1. Remove the rear panel (6 screws) and change its direction as shown in the
drawing (Fig. 5.3.5).
2. Affix the sealing material supplied in the position shown in the drawing. (Fig.
5.3.5) (If the rear intake filter box is used, it is not necessary to affix the seal
material (small).)
[Fig. 5.3.5] (P.3)
J Rear panel
L Apply the sealing material (small) only when not using the filter box.
[Fig. 5.3.6] (P.3)
A Indoor unit's bottom surface
1 Select the thickness of insulating material by pipe size.
Pipe size
6.4 mm to 25.4 mm
28.6 mm to 38.1 mm
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.
Flare dimensions øA dimensions (mm)
R407C or R22
Liquid pipe
Tightening
Pipe size torque Pipe size
(N·m)
O.D.ø6.35 (1/4") 14 – 18 O.D.ø12.7 (1/2")
O.D.ø9.52 (3/8") 34 – 42* O.D.ø15.88 (5/8")
O.D.ø9.52 (3/8") 34 – 42 O.D.ø15.88 (5/8")
O.D.ø9.52 (3/8") 34 – 42 O.D.ø19.05 (3/4")
K Sealing material (large)
Insulating material's thickness
More than 10 mm
More than 15 mm
8.7 – 9.1
12.8 – 13.2
16.2 – 16.6
19.3 – 19.7
22.9 – 23.3
Flare nut O.D.
Gas pipe
Tightening Liquid
torque pipe
(N·m) (mm)
49 – 61 17
68 – 82* 22
68 – 82 22
100 – 120* 22
Gas
pipe
(mm)
27
29
29
36