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15
The Zoneline can be connected
to a switch at the front desk that
allows you to turn the unit on or
off without going to each unit.
When the front desk switch is open
the Zoneline is on. Turn the switch
to closed to turn it off.
For load shedding,
the CDC auxiliary
switch 9 must be in the
OFF
(down)
position and auxiliary switch 12
must be in the
ON
(up)position.
This provides fan operation while
the compressor or heater
is turned off.
Note:
The Freeze Sentinel remains active to
help protect against low temperature
damage even though the unit may be
off at the central control location.
Central Desk Control
9 12
ON
OFF
ON
OFF
Recommended wire size
for Central Desk Control
installation
Wire Size
Maximum
# AWG
Allowable
Length
#24 400 ft.
#22 600 ft.
#20 900 ft.
#18 1500 ft.
#16 2000 ft.
CDC
Load shedding
Auxiliary Controls
Follow the recommended wire
sizing in the table. Two wires must
be used from each CDC switch to
each individual unit.
Good wiring practices (e.g.
twisted pairs, separation from
power circuits) must be followed
to minimize induced voltages
which may harm the control
system.
DO NOT
use a common
buss in the CDC wiring.
A 24-volt transformer is contained
within the unit and no external
voltage should be applied to the
unit through the CDC terminals.
These terminals may also be used
as an interface for other systems
used to control the unit, such as
infrared detectors, key-activated
systems, etc.
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