Despatch Protocol Plus Controller (Heat/Cool) - Manual (Page 12)

6
Outputs
The Protocol Plus control has seven different outputs available.
•
Heating output: The control output is a DC voltage open-collector output which
is time-proportioned and designed to control a heat control device such as a solid
state relay.
•
Cooling output: The cooling output is a 4 to 20 ma DC output which is designed
to control a cooling device such as a damper motor.
•
High limit: The high limit output is a form C relay which is energized under
normal operating conditions. If the control senses a temperature higher than the
high limit setpoint, or if there is a sensor error, the high limit relay will de-energize
until the condition is cleared and the Reset key is pressed. When the high limit
relay is de-energized, the heater is disabled.
•
Relay (four optional outputs): The four form A dry contact relay outputs can be
configured to function as alarms, events, or end of cycle. These outputs can be
utilized in Manual, Timer, or Profile Mode.
Layout for Optional Components