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. 45 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. 46).

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. 45 - T-56 Internal Connections

 

TB1

PL

SEN

1

J6-7

 

TB1

PL

SEN

3

J6-6

Jumper

SET

SET 5 J6-5

C08213

Fig. 46 - 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. 47.

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. 47 - 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. 43) 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. 44. Temperature-resistance characteristic is found in Table 15.

Configure the unit for Thermostat Mode — Connect to the CCN bus using a CCN service tool and navigate to

38

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Carrier 48TCA04---A12 appendix Thermostat Mode, Internal Connections

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