Mounting The Branch Box; Installing Refrigerant Piping - Mitsubishi Electric PAC-AKA51BC Manuel D'installation

6. Mounting the Branch Box

( )
A
*
Fig. 6-1
Wall mount
Fig. 6-2

7. Installing refrigerant piping

45°± 2°
A Flare cutting dimensions
B Flare nut tightening torque
Fig. 7-1
A Flare cutting dimensions
Table 1
Flare dimensions
Copper pipe O.D.
øA dimensions
ø6.35 (1/4) 8.7-9.1 (11/3-3/64)
ø9.5 (3/8) 1.8-13. (1/-33/64)
ø1.7 (1/) 16.-16.6 (41/64-1/3)
ø15.88 (5/8) 19.3-19.7 (49/64-5/3)
Fig. 7-2
Fig. 7-3
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(inch)
D
* Purchase an appropriate
bracket locally if the unit
is to be mounted on a
wall.
(inch)
(mm (inch))
(1) Install the suspension bolts (procure locally) at the specified pitch (Fig. 4-2, 4-3).
() Fit the washers and nuts (1, 2, procure locally) to the suspension bolts.
(Fig. 6-1)
(3) Hang the unit on the suspension bolts.
(4) Fully tighten the nuts (check ceiling height).
(5) Use a level to adjust the branch box to the horizontal.
When unit is hung and nuts tightened
A
Suspension bolt
B
Nuts
C
Washer (with cushion) 1
D
Ensure that cushion faces downwards
E
Washer (without cushion) 2
F
Nut (procure locally)
G
Suspension bolt
H
Ensure that this face is always installed upwards.
I
Ceiling board.
J
Note:
* Refer to "4-1"
Caution:
• Always install the unit horizontally.
• This unit may be installed suspended from the ceiling.
• This unit may only be installed vertically, as shown in the diagram below.
(Side is facing up.)
• Incorrect installation may result in the drain overflowing.
► Connect the liquid and gas pipes of each indoor unit to the same end
connection numbers as indicated on the indoor unit flare connection
section of each Branch Box. If connected to wrong end connection
numbers, it doesn't work normally. (Fig. 7-1)
► When connecting indoor units, make sure to connect refrigerant pipes
and connection wires to the appropriate connection ports marked with
matching alphabets. (Ex. A, B, C, D, E)
Note:
Be sure to mark all the local refrigerant piping (liquid pipes, gas pipes, etc.)
for each indoor unit designating clearly which room it belongs in. (Ex. A, B,
C, D, E)
► List indoor unit model names in the name plate on the control box of
Branch Box (for identification purposes).
► To prevent water dripping from the refrigerant piping, install sufficient
thermal insulation.
► When using commercially available refrigerant piping, ensure that both
liquid and gas piping are wrapped with commercially available thermal
insulation materials (insulation materials at least 1/2 inch (12 mm) thick
and able to withstand temperatures in excess of 212 ºF, 100 ºC).
► Refer to the installation manual of the outdoor unit when creating a
vacuum and opening or closing valves.
(1) Remove the flared nuts and caps from the branch box.
() Flare the ends of the liquid and gas piping, and apply refrigeration oil (procure
locally) to the flared seat.
(3) Connect the refrigerant piping immediately. Always tighten the flared nuts
to the torque specified in the table below using a torque wrench and double
spanner.
(4) Press the pipe covers 3 and 5 on the liquid piping against the unit and wrap
to hold in place.
(5) Press the pipe covers 4 and 6 on the gas piping against the unit and wrap to
hold in place.
(6) Apply the supplied bands 9 at a position 7/16-13/16 inch (10 - 0 mm) from
each end of the pipe covers (3456).
(7) If the indoor unit is not connected, fit the supplied pipe covers (with caps, 7
and 8) to the branch box refrigerant piping connections to prevent condensa-
tion dripping from the pipes.
(8) Clamp the pipe covers (78) in place with the supplied bands 9.
B Flare nut tightening torque
Table 2
Copper pipe O.D. Flare nut O.D.
(mm (inch)) (mm (inch))
ø6.35 (1/4) 17 (43/64)
ø6.35 (1/4)  (7/8)
ø9.5 (3/8)  (7/8)
ø1.7 (1/) 6 (1-3/64)
ø1.7 (1/) 9 (1-9/64)
ø15.88 (5/8) 9 (1-9/64)
ø15.88 (5/8) 36 (1-7/64)
Tightening torque
(N•m (ft•lbs))
14-18 (10-13)
34-4 (5-30)
34-4 (5-30)
49-61 (35-44)
68-8 (49-59)
68-8 (49-59)
100-10 (71-87)
5