Johnson Controls HIDH018B21S, Engineering Manual

Page: 322 / 668

CONTROL SYSTEM
6-6
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the controller.
Max. 16 Indoor Units
Controller
A B
A B
Controller
(Secondary)
M3
Screws
Electrical Box
of Indoor Unit Electrical Box
of Indoor Unit
Terminal Board Terminal Board
M3.5
Screws M3.5
Screws
Shield Communication Cable: 1P- AWG 18 (0.82mm
2
) or more
A A
B B
A. Use a AWG 22(0.12mm 2 ) to AWG 18(0.82mm 2 ) cable for connections. Communication cabling shall
be a minimum of 18-Gauge, 2-Conductor, Stranded Copper. Shielded cable must be considered for
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to reduce the potential for communication errors. When shielded cabling is applied, proper bonding and
termination of the cable shield is required as per Johnson Controls guidelines. Plenum and riser ratings
for communication cables must be considered per application and local code requirements.
The maximum total cable length is 98 ft. 4-13/16 in. (30m). If the total cable length exceeds 98 ft.
4-13/16 in. (30m), use a communication cable with a shield tube. (1P - AWG 18 (0.82mm
2
)). In this
case, the maximum total cable length is 1640 ft. 6 in. (500m).
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B. Keep a distance of more than 11-13/16 inches (30cm) between the transmission line (controller cable
and communication cables) and power source of the indoor units.
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because of effects of power source noise.
C. When simultaneously controlling multiple indoor units, set the system numbers and addresses of the
indoor units without overlapping.
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between the controller and indoor units for setting the system number and the indoor unit address.
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gap, cover the gap with vinyl tape.
If not covered correctly, water droplets or insects may cause a malfunction.
F. When operating with two controllers (primary and secondary), set the primary and secondary controllers
by selecting the appropriate function with the controllers. After setting it, turn OFF the power supply of
all the indoor units connected to the controllers.
G. The control timer cannot be used along with this controller.
NOTICE
Controller Cable