Refrigerant Piping - Mitsubishi Electric PAC-AK52BC Installation Manual

4. Dimensions and Required Servicing Space of Branch Box
PAC-AK31BC (3-branch type)
450
205
C B A
C B A
25 25 25 21
75 75
(1)
450
Min. 50 Min. 250
Fig. 4-5
(3)
Min.250

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
320
12
91 95 280 39
73 61 79 50 34
200
23
Type A
200
Type B
Fig. 4-4
(2)
*1
Min.
Min.
250 280 250
180-200
B
*3
Fig. 4-6
450
Fig. 4-7
Fig. 4-8
PAC-AK31BC (Fig.4-4)
(mm)
Suspension bolt: W3/8 (M10)
Refrigerant pipe flared connection
A
Liquid pipe ø6.35
Gas pipe ø9.52
Drain hose size: O.D.20 (VP16)
4.1. Space required for installation and servicing
(1) Front View (Fig. 4-5)
Branch box
On the side of piping
(2) Side View (Fig. 4-6, Fig. 4-7)
For indoor installations
Ceiling board
Maintenance hole
A
PCB side
*1: A minimum 350 mm is required for 90° bends in refrigerant piping.
Note:
When using the PAC-AK52BC branch box to connect P100 indoor unit(s),
the following procedure is required.
1. Connect the Y-shape connection pipe end(s) to the indoor unit(s).
2. Mount the branch box.
3. Connect the Y-shape connection pipe ends to the branch box.
*2: is " Min. 200 mm " <recommendation>.
(Premise: The slope of drain piping is securable 1/100 or more. Required
200 mm or more, when not securable.)
In the case of less than 200 mm (for example
work of Branch box from a maintenance hole becomes difficuBefore lt (Only
exchange work of a PCB, linear expansion valve coils, sensors and drain pan is
possible).
*3: is " 600 mm " <recommendation>.
In the case of " 450", prepare a maintenance hole at a PCB side (as it is shown
in Fig. 4-7), and "Min. 300 mm" is needed as distance
In the case of less than 300 mm (for example
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. 4-8)
Refrigerant piping
When facing in the opposite direction to the refrigerant piping.
B C
ø6.35 ø6.35
ø9.52 ø9.52
is 100 mm), the exchange
.
is 100 mm), the exchange
To outdoor unit
ø9.52
ø15.88