Refrigerant Piping; Tions; Cation - Mitsubishi Electric PAC-AKA51BC Installation Manual

4. Dimensions and required servicing space of Branch Box
PAC-AKA31BC (3-branches type)
17-11/16
8
C B A
C B A
1 1 1 13/16
3 3
Fig. 4-3
(1)
17
Min. 2 Min. 10
Fig. 4-4
Fig. 4-6
(3)
Min. 10
Fig. 4-7

5. Refrigerant piping

* Always follow the specifications written in the installation manual of the outdoor unit. Exceeding these requirements may cause reduced performance of the equipment,
and malfunctions.
4
12-9/16
1/2
1-1/2
3-9/16
3-3/4 11
2-3/8 3-1/8 2 1-3/8
2-7/8
7-7/8
15/16
Type A
7 - 7/8
Type B
(2)
*1
Min. Min.
10
10
11
7-8
B
*3
Fig. 4-5
17-3/4
PAC-AKA31BC (Fig.4-3)
(inch) Suspension bolt: W3/8 (M10)
Refrigerant pipe flared connection
A
Liquid pipe 1/4, ø6.35
Gas pipe 3/8, ø9.5
Drain hose size: O.D.0 mm, 13/16 inch (VP16)
4.1. Space required for installation and servicing
(1) Front View (Fig. 4-4)
Branch box
A
On the side of piping
B
() Side View (Fig. 4-5, Fig. 4-6)
For indoor installations
C
Ceiling board
D
Maintenance hole
E
PCB side
F
A
*1: A minimum 13-3/4 inch (350 mm) is required for 90° bends in refrigerant piping.
*2: is " Min. 7-7/8 inch (200 mm)" <recommendation>.
(Premise: The slope of drain piping is securable 1/100 or more. Required
7-7/8 inch (200 mm) or more, when not securable.)
In the case of less than 7-7/8 inch (00 mm) (for example
mm)), the exchange work of Branch box from a maintenance hole becomes dif-
ficult (Only exchange work of a PCB, linear expansion valve coils, sensors and
drain pan is possible).
*3: is " 23 - 5/8 inch (600 mm)" <recommendation>.
In the case of " 17-3/4 inch (450 mm)", prepare a maintenance hole at a PCB
side (as it is shown in Fig. 4-6), and "Min. 11-13/16 inch (300 mm)" is needed as
distance .
In the case of less than 11-13/16 inch (300 mm) (for example
mm)), the exchange work of Branch box, linear expansion valve coils, sensors,
and drain pan from a maintenance hole becomes difficult (Only exchange work
of a PCB is possible).
(3) Top View (Fig. 4-7)
Refrigerant piping
G
When facing in the opposite direction to the refrigerant piping.
H
B C To outdoor unit
1/4, ø6.35 1/4, ø6.35 3/8, ø9.5
3/8, ø9.5 3/8, ø9.5 5/8, ø15.88
inch, mm
is 4 inch (100
is 4 inch (100