Schwank ThermoControl Plus 2 - Manual (Page 36)

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8.5 Wiring diagram: Accessories
Option 1: Override Button (typical zone wiring)
NOTE: HUMIDITY CONTROL: (steel storage facilities, etc.) A humidity sensor can be connected in
parallel to the ‘SR’ to operate the heaters when humidity rises above humidity set-point
(even though temperature set-point may be satisfied).
Other inputs such as a coin-operated control can be connected in series to the SR.
Option 2: Average temperature determination,
Four SR sensors
IR / Ambient
Temperature Sensor
Override Button
(or other override input)