Confirming The Unit's Position And Fixing Hanging Bolts; Refrigerant Pipe And Drain Pipe Specifications; Refrigerant Pipe , Drain Pipe And Filling Port; Request For Refrigerant Piping Connection - Mitsubishi Electric City Multi PLFY-P-NLMU-E Installation Manual

5.2. Confirming the unit's position and fix-
ing hanging bolts
Use the gage supplied with the panel to confirm that the unit body and
hanging bolts are positioned in place. If they are not positioned in
place, it may result in dew drops due to wind leak. Be sure to check the
positional relationship.
Use a level to check that the surface indicated by
that the hanging bolt nuts are tightened to fix the hanging bolts.

6. Refrigerant pipe and drain pipe specifications

To avoid dew drops, provide sufficient antisweating and insulating work to the
refrigerant 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 [212 °F] and thickness given below) onto both liquid and gas pipes.
Be also sure to wind commercially available insulating material (with a form poly-
ethylene'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)
Flare cutting dimensions
Apply refrigerating machine oil over the entire flare seat surface
Flare cutting dimensions
Copper pipe O.D. (mm) [in]
φ 15.88 [5/8]
φ 19.05 [3/4]
Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Tightening
Pipe size
(mm) [in]
O.D. φ 6.35 [1/4]
P06/08/12/15 14 – 18
O.D. φ 6.35 [1/4]
P18 34 – 42
* Use the provided flare nut for the following pipes: Liquid pipe of P18 and gas pipe of P18.

6.2. Refrigerant pipe , drain pipe and filling port

[Fig. 6.2.1] (P.3)
Refrigerant pipe (liquid pipe)
Refrigerant pipe (gas pipe)

6.3. Request for refrigerant piping connection

Description of parts to be used
No. Work procedures
Mount the provided pipe insu-
lation (1) on the liquid pipe of
the refrigerant piping, and
then mount the flare insula-
1
tion (2) on the gas pipe.
Fixing of insulated pipe
2
Fixing of flare insulation
3
is at level. Ensure
Refrigerant pipe sizes & Flare nut tightening torque
φ 6.35 [1/4]
φ 9.52 [3/8]
φ 12.7 [1/2]
R410A
Gas pipe
Tightening
Pipe size
torque torque
(mm) [in]
(N·m) (N·m)
O.D. φ 12.7 [1/2]
49 – 61
O.D. φ 12.7 [1/2]
68 – 82
Drain pipe Hanging bolt pitch
Filling port Drain hole
Detail of work
"INNER" and "OUTER" are marked on the
inside of the flare insulation. Mount the por-
tion marked "INNER" near the unit body and
the portion marked "OUTER" on the field pip-
ing 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 pro-
vided tape (3).
• Fasten with the provided tie band (4) at the
position indicated on the drawing.
To ensure that drain is discharged, be sure to hang the unit at level
using a level.
Caution:
Be sure to install the unit body at level.
[Fig. 5.2.1] (P.3)
Indoor unit's bottom surface
(Surface to which a decorative panel is attached)
A Select the thickness of insulating material by pipe size.
Pipe size
6.4 mm to 25.4 mm [1/4 in to 1 in]
28.6 mm to 38.1 mm [1-1/8 in to 1-1/2 in]
B 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.
C If there are customer's specifications, simply follow them.
Flare dimensions φ A dimensions (mm) [in]
12.8 – 13.2 [17/32~17/32]
16.2 – 16.6 [21/32~21/32]
19.3 – 19.7 [25/32~25/32]
22.9 – 23.3 [29/32~30/32]
R22
Liquid pipe
Tightening
Pipe size Pipe size
torque
(mm) [in] (mm) [in]
(N·m)
O.D. φ 6.35 [1/4] O.D. φ 12.7 [1/2]
14 – 18
O.D. φ 9.52 [3/8] O.D. φ 15.88 [5/8]
34 – 42*
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 correct one.
• To prevent a gap from forming near the unit's side
plate, be sure that the flare insulation firmly contacts
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.
Insulating material's thickness
More than 10 mm [13/32 in]
More than 15 mm [19/32 in]
8.7 – 9.1 [11/32~6/16]
Flare nut O.D.
Gas pipe
Tightening Liquid
torque pipe
(N·m) (mm) [in]
49 – 61 17 [11/16]
68 – 82* 22 [7/8]
Reference drawing
[Fig. 6.3.1] (P.4)
[Fig. 6.3.2] (P.4)
[Fig. 6.3.2] (P.4)
[Fig. 6.3.3] (P.4)
[Fig. 6.3.3] (P.4)
Gas
pipe
(mm) [in]
27 [1-3/32]
29 [1-5/32]
(Note *3)
(Note *4)
9