Johnson Controls MAHP18B21S - Figure 27. Reconnect Wiring

PMGB0406B rev.1
53
(1) Connect the cable for the optional controller or the optional extension cable to the terminals inside the
control box through the connecting hole of the enclosure.
(2) Connect the power supply and the ground wiring to the terminals in the control box.
(3) Connect the cables between this product and the outdoor unit to the terminals inside the control box.
(4) Connect cables to their corresponding terminal number and the similarly marked band.
(5) Connect the communication cable between those indoor units connected to the same outdoor unit.
(6) Do not connect the main power supply wiring to the communication line (Terminals A, B, 1 and 2 of
TB2). If connected, the printed circuit board (PCB) will be destroyed.
(7) Tightly clamp the power supply wiring and communication cables using the cable clamp inside the
control box.
NOTE:
When the standard wire is used for the ¿ eld-wiring
connection, the M4 crimping terminal should be used.
When the single wire is used, fashion it into the shape
as shown at right and connect it in order to tighten
the washer uniformly. The screws at the terminal
block should be tightened according to the torque
speci¿ cation as shown in the table on previous page.
Stranded Wire Single Wire
Connect it with
Crimping Terminal.
Connect it Direct
As Shown Below.
(8) All electrical work should be performed in strict accordance with electrical schematics in the "Installation
and Maintenance Manual".
(9) If Power Supply Voltage (208V/230V) is introduced into the Communication Line:
If 208V/230V are applied to the communication line at (Terminals 1 and 2 of TB2) by mistake, the fuse
on the PCB for the communication line will blow. In this case, perform the recovery work as shown in
the diagrams below.
(a) Reconnect the wirings correctly.
(b) Set the No.1 pin at DSW7 (on the PCB) to ON.
Upon PCB recovery after the fuse has been replaced, if 208V / 230V is reintroduced into the
communication line, the PCB will be seriously damaged and will not recover.
L1
R
L2
A
C 208V/230V
Incorrect Wiring Reconnect wirings correctly.
5V
AB12
S
L1
R
L2
AC 208V/230V
5V
AB12
S
ON
OFF
DSW7
Set No.1 Pin
at ON side.
PCB
12
Ɣ VRF Systems
(a) Wired Controllers to each Unit for Individual Operation Setting
with DX-Kit with DX-Kit
Indoor Unit Indoor Unit
A B
Outdoor Unit
A B
Wired
Controller
Wired
Controller
(10) Wired Controller Connection
Figure 27. Reconnect Wiring
(Ins)DX-Kit4e-rev1.indd53
(Ins)DX-Kit4e-rev1.indd53
2016/11/2515:32:56
2016/11/2515:32:56