Carrier 42BC Series Technical Data Manual page 65

115V
Electric Diagram Wired or Wireless Remote Control (supplied as a kit):
* Use the diagram below for 2-tube cooling only units or 4-tube units.
To 2-Tubes Connection (heat/cool):
When the control K42AB is connected to a 2-tubes unit (chilled water or hot water), it is
necessary to combine the outputs 1 and 3 to drive the valve.
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CATÁLOGO TÉCNICO / DATOS TÉCNICOS / TECHNICAL DATA - CT 42B 60Hz