Carrier 50HCQA RTU-MPController Inputs and Outputs, Supply Air Temperature SAT Sensor

50HCQA

Table 8 – RTU-MP Controller Inputs and Outputs

		POINT NAME	BACnet OBJECT		TYPE OF I/O	CONNECTION PIN
			NAME			NUMBERS
			INPUTS
Space Temperature Sensor			sptsens		AI (10K Thermistor)	J20---1, 2
Supply Air Temperature			sat		AI (10K Thermistor)	J2---1, 2
Local Outside Air Temperature Sensor			oatsens		AI (10K Thermistor)	J2---3, 4
Space Temperature Offset Pot			sptopot		AI (100K Potentiometer)	J20---3
Indoor Air Quality			iaq		AI (4---20 ma)	J4---2, 3
Outdoor Air Quality			oaq		AI (4---20 ma)	J4---5, 6
Safety Chain Feedback			safety		DI (24 VAC)	J1---9
Compressor Safety			compstat		DI (24 VAC)	J1---2
Fire Shutdown			firedown		DI (24 VAC)	J1---10
Enthalpy Switch			enthalpy		DI (24 VAC)	J2---6, 7
Humidistat Input Status			humstat		DI (24 VAC)	J5---7, 8
			CONFIGURABLE	INPUTS*
Space Relative Humidity			sprh		AI (4---20 ma)	J4---2,3 or J4---5,6
Outside Air Relative Humidity			oarh		AI (4---20 ma)
Supply Fan Status			fanstat		DI (24 VAC)	J5---1,2 or J5---3,4 or
Filter Status			filtstat		DI (24 VAC)
						J5 5,6 or J5---7,8
Remote Occupancy Input			remocc		DI (24 VAC)
			OUTPUTS
Economizer Commanded Position			econocmd		4---20ma	J2---5
Supply Fan Relay State			sf		DO Relay (24VAC , 1A)	J1---4
Compressor 1 Relay State			comp_1		DO Relay (24VAC , 1A)	J1---8
Compressor 2 Relay State			comp_2		DO Relay (24VAC , 1A)	J1---7
Heat Stage 1 Relay State			heat_1		DO Relay (24VAC , 1A)	J1---6
Heat Stage 2 Relay State			heat_2		DO Relay (24VAC , 1A)	J1---5
Power Exhaust Relay State			aux_2		DO Relay (24VAC , 1A)	J11---3
Dehumidification Relay State			humizer		DO Relay (24VAC, 1A)	J11---7, 8
LEGEND
AI	---	Analog Input
AO ---		Analog Output
DI	---	Discrete Input
DO ---		Discrete Output

*These inputs (if installed) take the place of the default input on the specific channel according to schematic. Parallel pins J5--- 1 = J2--- 6, J5--- 3 = J1--- 10, J5--- 5 = J1--- 2 are used for field--- installation.

The RTU-MP controller requires the use of a Carrier space sensor. A standard thermostat cannot be used with the RTU-MP system.

Supply Air Temperature (SAT) Sensor —

On FIOP-equipped 50HCQ unit, the unit is supplied with a supply-air temperature (SAT) sensor (33ZCSENSAT). This sensor is a tubular probe type, approx 6-inches (152.4 mm) in length. It is a nominal 10-k ohm thermistor.

The SAT is factory-wired. The SAT probe is wire-tied to the supply-air opening (on the horizontal opening end) in its shipping position. Remove the sensor for installation. Re-position the sensor in the flange of the supply-air opening or in the supply air duct (as required by local codes). Drill or punch a 1/2-in. hole in the flange or duct. Use two field-supplied, self-drilling screws to secure the sensor probe in a horizontal orientation. See Fig. 29.

Outdoor Air Temperature (OAT) Sensor —

The OAT is factory-mounted in the EconoMi$er2 (FIOP or accessory). It is a nominal 10k ohm thermistor attached to an eyelet mounting ring.

EconoMi$ert2 —

The RTU-MP control is used with EconoMi$er2 (option or accessory) for outdoor air management. The damper position is controlled directly by the RTU-MP control; EconoMi$er2 has no internal logic device.

Outdoor air management functions can be enhanced with field-installation of these accessory control devices:

Enthalpy control (outdoor air or differential sensors) Space CO2 sensor

Outdoor air CO2 sensor

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