Johnson Controls MAHP18B21S - Figure 26. Positions of Electrical Wiring Connection

PMGB0406B rev.1
52
(A)
(B)
(C)
Screw
NOTICE
Ɣ Do not connect the main power supply wiring to the communication
line (Terminals A, B, 1 and 2 of TB2). If these are connected, the
printed circuit board (PCB) will be destroyed.
Ɣ Note the following for wire connections at TB1 and TB2:
(A) Attach a piece of insulation tape or sleeve at each terminal.
(B) Maintain a safe distance between the control box and the
terminals to prevent a short circuit.
(C) Maintain a safe distance between the terminals.
• The electrical wiring connection for the DX-Kit is shown in Section 21.2.2.
• The connection at the terminal block for the DX-Kit is shown in the ¿ gure below. Check the outdoor unit for
the combination before the wiring work. The screws at the terminal block should be performed according
to the tightening torque as shown in the table below.
Tightening Torque for Terminals
Screw Size Tightening Torque
TB1, TB2,
TB3
M3.5
0.9
(1.2
ft·lbs
N·m)
Control Box
Terminal Block for High Voltage Side
(Power Source Cable) TB1
Terminal Block for Low Voltage Side
(Control Cable) TB2
3412 8791110 12213546
Expansion Valve Box
Terminal Block for Expansion Valve Cable TB3
3412 65
Figure 26. Positions of Electrical Wiring Connection
21.3 Position of Electrical Wiring Connection
Ɣ Check for the recommended size GFCI in table 7.1 of the "Installation and Maintenance Manual" for
the outdoor unit.
Ɣ Between indoor and outdoor units, use dual-conductor, AWG18 (0.82mm
2
) stranded copper cable
for communication cable. Do not use any cable with more than two conductors. Twisted pair or
shielded cable can be used in environments with excessive electrical noise to reduce the possibility
of communication errors between system components. Total cable length should not exceed 3281 ft
(1000m).
Ɣ Select the wiring size, GFCI (Ground Fault Circuit Interrupter) in accordance with the regulations for
each region, the "Installation and Maintenance Manual", and the dedicated electrical circuit that must
be used.
Ɣ Outside of this product, installation of the power supply wiring, communication cable, and wired
controller cable should be spaced as far apart as possible.
NOTICE
(Ins)DX-Kit4e-rev1.indd52
(Ins)DX-Kit4e-rev1.indd52
2016/11/2515:32:56
2016/11/2515:32:56