DUCT SWITCHING T-STAT 70/75 DEG.
Description
The KMC CTC-4001/4004 thermostats are designed as thermally powered, three-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 duct work.
The (default) factory setpoint span of the CTC-4001 is 70 to 75° F (21 to 24° C), and the CTC-4004’s is 65 to 70° F (18 to 21° C), allowing the units to sense and differentiate between heating and cooling airstreams.
The setpoint adjustment allows ranges to be moved up 5° F or down 10° from the default values.
The CTC-4001 and CTC-4004 are not snap-acting. The unit must be below or above the setpoint range to completely switch. At temperatures within the setpoint range, all three ports are connected.
For single duct, heating-cooling change-over on VAV units, install the CTC-4001/4004 in the box inlet collar. Supplied with two signals from a heating-cooling thermostat, the CTC-4001/4004 can switch the box to the correct control signal based on duct temperature.
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