Carrier 48TC*D08 appendix Thermostat Mode, Internal Connections

48TC

Table 18 – Thermostat Mode

TB1 TERMINAL	FIELD CONNECTION	INPUT SIGNAL
1	RAT SEN	Analog (10k thermistor)
2	G	Discrete, 24VAC
3	RAT SEN	Analog (10k thermistor)
4	Y1	Discrete, 24VAC
5
6	Y2	Discrete, 24VAC
7	LOOP---PWR	Analog, 24VDC
8	W1	Discrete, 24VAC
9	IAQ ---SEN	Analog, 4---20mA
10	W2	Discrete, 24VAC
11	IAQ ---COM/OAQ ---COM/RH ---COM	Analog, 4---20mA
12	CCN + (RED)	Digital, 5VDC
13	OAQ ---SEN/RH ---SEN	Analog, 4---20mA
14	CCN Gnd (WHT)	Digital, 5VDC
15	AUX OUT (Power Exhaust)	(Output) Discrete 24VAC
16	CCN --- (BLK)	Digital, 5VDC

LEGEND:
CCN	---	Carrier Comfort Network (communication bus)	RH	--- Relative Humidity
G	---	Thermostat Fan	W1	--- Thermostat Heat Stage 1
IAQ	---	Indoor Air Quality (CO2)	W2	--- Thermostat Heat Stage 2
OAQ	---	Outdoor Air Quality (CO2)	Y1	--- Thermostat Cool Stage 1
RAT	---	Return Air Temperature	Y2	--- Thermostat Cool Stage 2

Connect T-56 — See Fig. 46 for T-56 internal connections. Install a jumper between SEN and SET terminals as illustrated. Connect T-56 terminals to TB1 terminals 1, 3, and 5 (see Fig. 47).

1	2	3	4	5	6	RED(+)
					WHT(GND)		CCN COM
						BLK(-)
			SEN		SET
	SW1					BLK
						(T56)
					BRN (GND)		SENSOR WIRING
					BLU (SPT)
							JUMPER
							TERMINALS
							AS SHOWN

Cool Warm

C08202

Fig. 46 - T-56 Internal Connections

	TB1	PL
SEN	1	J6-7
	TB1	PL
SEN	3	J6-6

Jumper

SET

SET 5 J6-5

C08213

Fig. 47 - PremierLink T-56 Sensor

Connect Thermostat — A 7-wire thermostat connection requires a 24-v power source and a common connection. Use the R and C terminals on the LCTB’s THERMOSTAT connection strip for these. Connect the thermostat’s Y1, Y2, W1, W2 and G terminals to PremierLink TB1 as shown in Fig. 48.

SPACELCTB

THERMOSTAT THERMOSTAT

R	R
	TB1	PL
G	2	J4-12

Y1 4 J4-10

Y2 6 J4-8

W1 8 J4-6

W2 10 J4-4

C C LCTB

THERMOSTAT

C08119

Fig. 48 - Space Thermostat Connections

If the 48TC unit has an economizer system and free-cooling operation is required, a sensor representing Return Air Temperature must also be connected (field-supplied and installed). This sensor may be a T-55 Space Sensor (see Fig. 44) installed in the space or in the return duct, or it may be sensor PNO 33ZCSENSAT, installed in the return duct. Connect this sensor to TB1-1 and TB1-3 per Fig. 45. Temperature-resistance characteristic is found in Table 15.

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