The
KMC CTC-4001 and CTC-4004 thermostats are designed as thermally powered, 3-way
switching devices for conditioned airstreams of HVAC systems. A signal can be
diverted to one of two circuits based on duct temperature. This is useful in
applications such as disabling electric heaters when hot air is present in the
ductwork.
The factory setpoint span of the CTC-4001 is 70–75° F (21–24° C) and the
CTC-4004's is 65–70° F (18–21° C) allowing the units to sense, and
differentiate, between heating and cooling airstreams.
For single duct, heating-cooling change-over on VAV units, install the CTC-4001
or CTC-4004 in the box inlet collar. Supplied with two signals from a
heating-cooling thermostat, the CTC-4001 or CTC-4004 can switch the box to the
control of the correct signal based on duct temperature.
