Mounting The Branch Box; Installing Refrigerant Piping - Mitsubishi Electric PAC-AK53BC Installation Manual

6. Mounting the Branch Box

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

7. Installing refrigerant piping

45° ± 2°
Flare cutting dimensions
Flare nut tightening torque
Fig. 7-1
A Flare cutting dimensions
Table 1
Copper pipe O.D. Flare dimensions
(mm) øA dimensions (mm)
ø6.35
ø9.5
ø1.7
ø15.88
Port B
Port A
Fig. 7-2
D
* Purchase an appropriate
bracket locally if the unit
is to be mounted on a
wall.
8.7 - 9.1
1.8 - 13.
16. - 16.6
19.3 - 19.7
Fig. 7-3
Fig. 7-4
(1) Install the suspension bolts (procure locally) at the specified pitch (Fig. 4-3, 4-4).
(mm)
() Fit the washers and nuts (1, 2, procure locally) to the suspension bolts.
(Fig. 6-1)
(3) Hang the unit on the suspension bolts.
Note:
When using PAC-AK52BC/PAC-AK53BC to connect P100 indoor unit(s), en-
sure that the Y-shaped connection pipe(s) is(are) connected to the indoor
unit(s) before mounting the branch box.
(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)
► When connecting P100 indoor unit(s) by using PAC-AK52BC/PAC-AK53BC, use Y-shaped
connection pipe(s) and perform the following piping. (Fig. 7-2)
When a single P100 indoor unit is wired to TB3A, connect the Y-shaped connection pipe
ends to Port A + B.
When two P100 indoor units are wired to TB3A and TB3C respectively, connect the Y-shaped
connection pipe ends to Port A + B and Port C + D.
For details, refer to the installation manual of the Y-shape connection pipe (PAC-AK52YP-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 identi-
fication 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 15 mm thick and able
to withstand temperatures in excess of 120 °C).
► 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 10 - 0 mm from each end of the
pipe covers ( 3 4 5 6 ).
(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 ( 7 8 ) in place with the supplied bands 9.
B Flare nut tightening torque
Table 2
Copper pipe O.D. (mm)
ø6.35
ø6.35
ø9.5
ø9.5
ø1.7
ø1.7
ø15.88
ø15.88
Flare nut O.D. (mm) Tightening torque (N·m)*
17


6
6
9
9
36 100 - 10
* 1N·m
14 - 18
34 - 4
34 - 4
49 - 61
49 - 61
68 - 8
68 - 8
10 kgf·cm
5