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3. A 24-volt transformer is contained in the
Zoneline. No external voltage may be applied to
the unit through the CDC terminals. (Voltage on
the CDC conductors is 24 volts AC.)
4. Recommended wire size must be followed as a
minimum requirement.
Freeze Sentinel™ remains operational when the
unit is connected to a CDC system. Even if the unit
is turned OFF at the central location, if the sensor
at the unit detects the low temperature, the electric
resistance heaters and the fan will automatically
turn on. Connecting the Zoneline to a CDC system
does not eliminate the ability to connect the unit to
a remote thermostat. Once the circuit is opened and
control of the unit is removed from the CDC system,
the selected controls - either the unit-mounted
control or the remote thermostat - govern the
operation of the unit.
CDC Terminal Location and Typical Wiring
See the following section,
Auxiliary Controls
, for
location of CDC terminals on unit.
Important CDC Comments (All Series Applicable)
1. When the switching device closes the circuit of
the CDC conductors, unit operation stops.
2. Do not use a common buss (at the unit or at
the switch panel) in the wiring. Both wires
comprising the circuit must connect to the
unit connectors and to the controlling switch.
Running 1 wire from 1 unit to another unit is
common bussing and may damage internal
components or cause erratic operation of the
system.
