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Field connections – Carrier 50HCQA User Manual

Page 19

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19

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 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 CO

2

sensor

Outdoor air CO

2

sensor

Refer to Table 3 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

(See Fig. 30). 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 4 provides a summary of field connections for units

equipped with Space Sensor. Table 5 provides a summary of

field connections for units equipped with Space Thermostat.

Space Temperature (SPT) Sensors —

The PremierLink controller is factory--shipped configured for

Space Sensor Mode. A 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.

2

3

4

5

6

1

SW1

SEN

BRN (GND)

BLU (SPT)

RED(+)

WHT(GND)

BLK(-)

CCN COM

SENSOR WIRING

C08201

Fig. 31 -- T--55 Space Temperature Sensor Wiring

Connect T--55: See Fig. 31 for typical T--55 internal

connections. Connect the T--55 SEN terminals to TB1

terminals 1 and 3 (see Fig. 32).

SEN

J6-7

J6-6

1

3

TB1

PL

SEN

C08212

Fig. 32 -- PremierLink T--55 Sensor

Connect T--56: See Fig. 33 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. 34).

2

3

4

5

6

1

SW1

SEN

SET

Cool

Warm

BRN (GND)

BLU (SPT)

RED(+)

WHT(GND)

BLK(-)

CCN COM

SENSOR WIRING

JUMPER
TERMINALS
AS SHOWN

BLK
(T56)

C08202

Fig. 33 -- T--56 Internal Connections

SEN

J6-7

J6-6

1

3

TB1

PL

SEN

SET

Jumper

TB1

PL

J6-5

5

SET

C08213

Fig. 34 -- 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 CTB’s THERMOSTAT connection strip

for these. Connect the thermostat’s Y1, Y2, W1, W2 and

G terminals to PremierLink TB1 as shown in Fig. 35.

If the 50HCQ unit is equipped with factory--installed

smoke detector(s), disconnect the factory BLU lead at

TB1--6 (Y2) before connecting the thermostat. Identify the

BLU lead originating at CTB--DDC--1; disconnect at

TB1--6 and tape off. Confirm that the second BLU lead at

TB1--6 remains connected to PremierLink J4--8.

50H

C

Q

A