Carrier 48HC Field Connections, Supply Air Temperature SAT Sensor, EconoMi$er2

Supply Air Temperature (SAT) Sensor —

On FIOP-equipped 48HC unit, the unit is supplied with a supply-air temperature (SAT) sensor (33ZCSENSAT). This sensor is a tubular probe type, approx 6-inches (12.7 mm) in length. It is a nominal 10-k ohm thermistor.

The SAT is factory-wired. The SAT probe is mounted in the fan deck (see Fig. 40). It can be removed or remounted per 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. Insure that the sensor wires do not contact the hot surface of the heat exchanger.

SUPPLY AIR	ROOF
TEMPERATURE
	CURB
SENSOR
SUPPLY AIR	RETURN AIR
	C10733

Fig. 40 - Mounting Location for Supply Air Temperature (SAT) Sensor on 48HC Units

NOTE: Refer to Form 33CS-67SI for complete PremierLink configuration, operating sequences and troubleshooting information. Have a copy of this manual available at unit start-up.

NOTE: The sensor must be mounted in the discharge airstream downstream of the cooling coil and any heating devices. Be sure the probe tip does not come in contact with any of the unit’s heater surfaces.

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$er2 —

The PremierLink control is used with EconoMi$er2 (option or accessory) for outdoor air management. The damper position is controlled directly by the PremierLink control; EconoMi$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

Refer to Table 4 for accessory part numbers.

Field Connections

Field connections for accessory sensor and input devices are made at the 16-pole terminal block (TB3, see Fig. 38 and Fig. 39) located on the control box top shelf in front of the PremierLink control. Some input devices also require a 24-vac signal source; connect at CTB terminal R at “THERMOSTAT” connection strip for this signal source. See connections figures on following pages for field connection locations (and for continued connections at the PremierLink board inputs).

Table 5 provides a summary of field connections for units equipped with Space Sensor. Table 6 provides a summary of field connections for units equipped with Space Thermostat.

48HC

Table 4 – PremierLink Sensor Usage

APPLICATION			OUTDOOR AIR	RETURN AIR	OUTDOOR AIR	RETURN AIR
			TEMPERATURE	TEMPERATURE
					ENTHALPY SENSOR	ENTHALPY SENSOR
			SENSOR	SENSOR
Differential Dry Bulb				Required ---
Temperature with			Included ---
PremierLink				33ZCT55SPT	---	---
			CRTEMPSN001A00
(PremierLink requires				or equivalent
4---20 mA Actuator)
Single Enthalpy with			Included ---		Requires ---
PremierLink				---		---
(PremierLink requires			Not Used		33CSENTHSW
4---20mA Actuator)
Differential Enthalpy			Included ---		Requires ---	Requires ---
with PremierLink				---
					33CSENTHSW	33CSENTSEN
(PremierLink requires			Not Used
					or equivalent	or equivalent
4---20mA Actuator)
NOTES:
CO2 Sensors (Optional):
33ZCSENCO2	---	Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPCO2	---	Aspirator box used for duct--- mounted CO2 room sensor.
33ZCT55CO2	---	Space temperature and CO2 room sensor with override.
33ZCT56CO2	---	Space temperature and CO2 room sensor with override and setpoint.

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