T-55 Space Temperature Sensor Wiring

Table 5 – Thermistor Resistance vs Temperature Values for Space Temperature Sensor, Supply Air Temperature Sensor, and Outdoor Air Temperature Sensor

TEMP	TEMP	RESISTANCE
(C)	(F)	(Ohms)

--- 40	--- 40	335,651

--- 35	--- 31	242,195

--- 30	--- 22	176,683

--- 25	--- 13	130,243
--- 20	--- 4	96,974

--- 15	5	72,895

--- 10	14	55,298
--- 5	23	42,315

0	32	32,651

5	41	25,395
10	50	19,903

15	59	15,714

20	68	12,494

25	77	10,000

30	86	8,056
35	95	6,530

40	104	5,325

45	113	4,367
50	122	3,601

55	131	2,985

60	140	2,487
65	149	2,082

70	158	1,752

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 Economizer 2 (FIOP or accessory). It is a nominal 10k ohm thermistor attached to an eyelet mounting ring. See Table 5 for temperature-resistance characteristic.

Economizer 2 — The PremierLink control is used with Economizer 2 (option or accessory) for outdoor air management. The damper position is controlled directly by the PremierLink control; Economizer 2 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 6 for accessory part numbers

Field connections — Field connections for accessory sensor and input devices are made at the 16-pole terminal block (TB1) located on the control box bottom shelf in front of the PremierLink control. Some input devices also require a 24-vac signal source; connect at LCTB 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 7 provides a summary of field connections for units equipped with Space Sensor. Table 8 provides a summary of field connections for units equipped with Space Thermostat.

Space Sensors - The PremierLink controller is

factory-shipped configured for Space Sensor Mode. A

50TC

Carrier T-55 or T-56 space sensor must be used. T-55

space temperature sensor provides a signal of space

temperature to the PremierLink control. T-56 provides

same space temperature signal plus it allows for

adjustment of space temperature setpoints from the face of

the sensor by the occupants. See Table 5 for temperature

versus resistance characteristic on the space sensors.

Connect T-55 - See Fig. 36 for typical T-55 internal

connections. Connect the T-55 SEN terminals to TB1