Carrier 30RA/RH, 30RY/RYH manual

3.6.2- Volt-free contact on/off/cooling/heating without multiplexing

If the automatic heating/cooling changeover function is not selected (see sections 4.3.11.3, 5.1 and 5.2) the operation of contacts 1 and 2 is as follows:

	OFF	ON cooling	ON heating
Contact 1	Open	Closed	Closed
Contact 2	-	Open	Closed

Contact status not significant

3.6.3- Volt-free contact on/off/cooling/heating with multiplexing

If the automatic heating/cooling changeover function is selected (see sections 4.3.11.3, 5.1 and 5.2) the operation of contacts 1 and 2 is multiplexed:

	OFF	ON cooling	ON heating	ON auto
Contact 1	Open	Closed	Closed	Open
Contact 2	Open	Open	Closed	Closed

NOTE: The automatic changeover function (ON auto) selects the cooling or heating mode based on the outdoor temperature (see section 5.2).

3.6.4- Demand limit or setpoint volt-free contact for single- circuit units

On single-circuit units contact 3 determines the selection of demand limit or setpoint, based on the configuration (see User Configuration 1 menu).

Demand limit selection		Setpoint selection
100%	Limit 1	Setpoint 1	Setpoint 2
(no limit)
Contact 3 Open	Closed	Open	Closed

3.6.5- Demand limit volt-free contact for dual-circuit units On dual-circuit units the operation of the demand limit selection contacts is multiplexed. The demand limit setpoints are adjustable in the setpoint menu (see section 4.3.8).

	100%	Limit 1	Limit 2	Limit 3
	(no limit)
Contact 3	Open	Closed	Open	Closed
Contact 4	Open	Open	Closed	Closed

3.6.6- Water setpoint selection volt-free contact with multiplexing for dual-circuit units

On dual-circuit units the operation of the cold water or hot water setpoint selection contacts is multiplexed. The set-points are adjustable in the setpoint menu (see section 4.3.8). Auto means that the active setpoint is determined by the setpoint schedule (see section 5.6.1).

Cooling mode

	Setpoint 1	Setpoint 2	Setpoint 3	Auto
Contact 5	Open	Open	Closed	Closed
Contact 6	Open	Closed	Open	Closed
Heating mode
	Setpoint 1	Setpoint 2	Setpoint 3	Auto
Contact 5	Open	Open	Closed	Closed
Contact 6	Open	Closed	Open	Closed

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