Carrier 48TM016-028

Table 8 — PremierLink™ Sensor Usage

*PremierLink control requires supply air temperature sensor 33ZCSENSAT and

outdoor air temperature sensor HH79NZ039 — Included with factory-installed PremierLink control;

field-supplied and field-installed with field-installed PremierLink control.

NOTES:

1. CO2Sensors (Optional):

33ZCSENCO2 — Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.

33ZCASPCO2 — Aspirator box used for duct-mounted CO2room sensor.

33ZCT55CO2 — Space temperature and CO2room sensor with override.

33ZCT56CO2 — Space temperature and CO2room sensor with override and setpoint.

2. All units include the following standard sensors:

Outdoor-air sensor — 50HJ540569 — Opens at 67 F, closes at 52 F, not adjustable.

Mixed-air sensor — HH97AZ001 — (PremierLink control requires supply air temperature sensor 33ZCSENSAT

and outdoor air temperature sensor HH79NZ039)

Compressor lockout sensor — 50HJ540570 — Opens at 35 F, closes at 50 F.

ENTHALPY SWITCH/RECEIVER — The accessory en-

thalpy switch/receiver (33CSENTHSW) senses temperature

and humidity of the air surrounding the device and calculates

theenthalpywhenusedwithoutanenthalpysensor.Therelayis

energized when enthalpy is high and deenergized when

enthalpy is low (based on ASHRAE [American Society of

Heating, Refrigeration and Air Conditioning Engineers] 90.1

criteria). If an accessory enthalpy sensor (33CSENTSEN) is

attached to the return air sensor input, then differential enthalpy

is calculated. The relay is energized when the enthalpy detected

by the return air enthalpy sensor is less than the enthalpy at the

enthalpy switch/receiver. The relay is deenergized when the

enthalpy detected by the return air enthalpy sensor is greater

than the enthalpy at the enthalpy switch/receiver (differential

enthalpy control). See Fig. 27 and 28.

OUTDOOR ENTHALPY CONTROL (Fig. 29) — Out-

door enthalpy control requires only an enthalpy switch/

receiver (33CSENTHSW). The enthalpy switch/receiver is

mounted in the outdoor air inlet and calculates outdoor air

enthalpy. The enthalpy switch/receiver energizes the relay

output when the outdoor enthalpy is above 28 BTU/lb OR dry

bulb temperature is above 75 F and is deenergized when

the outdoor enthalpy is below 27 BTU/lb AND dry bulb

temperature is below 74.5 F. The relay output is wired to the

unit economizer which will open or close depending on the

output of the switch.

NOTE: The enthalpy calculation is done using an average

altitude of 1000 ft above sea level.

Mounting — Mount the enthalpy switch/receiver in a location

where the outdoor air can be sampled (such as the outdoor air

intake). The enthalpy switch/receiver is not a NEMA 4

(National Electrical Manufacturers Association) enclosure and

should be mounted in a location that is not exposed to outdoor

elements such as rain or snow. Use two field-supplied no. 8 x

3/4-in. TEK screws. Insert the screws through the holes in the

sides of the enthalpy switch/receiver.

Wiring — Carrier recommends the use of 18 to 22 AWG

(American Wire Gage) twisted pair or shielded cable for all

wiring. All connections must be made with 1/4-in. female spade

connectors.

A 24-vac transformer is required to power the enthalpy

switch/receiver; as shown in Fig. 29, the PremierLink™ board

provides 24 vac. Connect the GND and 24 VAC terminals on

the enthalpy switch/receiver to the terminals on the transform-

er. On some applications, the power from the economizer

harness can be used to power the enthalpy switch/receiver. To

power the enthalpy switch/receiver from the economizer

harness, connect power of the enthalpy switch/receiver to the

red and brown wires (1 and 4) on the economizer harness.

For connection to rooftop units with PremierLink™ control,

connect the LOW Enthalpy terminal on the enthalpy switch/

receiver to J4 — pin 2 of the PremierLink control on the

HVAC unit. The switch can be powered through the Premier-

Link control board if desired. Wire the 24 VAC terminal on the

enthalpy switch/receiver to J4 — pin 1 on the PremierLink

control. Wire the GND terminal on the enthalpy switch/

receiver to J1 — pin 2 on the PremierLink control. The HI

Enthalpy terminal is not used. See Fig. 29.

APPLICATION OUTDOOR AIR

TEMPERATURE SENSOR

RETURN AIR

TEMPERATURE SENSOR

OUTDOOR AIR

ENTHALPY SENSOR

RETURN AIR

ENTHALPY SENSOR

Differential Dry Bulb

Temperature with

PremierLink*

(PremierLink

requires 4-20 mA

Actuator)

Included —

HH79NZ039

Required —

33ZCT55SPT

or Equivalent

——

Single Enthalpy with

PremierLink*

(PremierLink

requires 4-20 mA

Actuator)

Included —

Not Used —

Required —

33CSENTHSW

(HH57ZC003)

HH57AC077

—

Differential Enthalpy

with PremierLink*

(PremierLink

requires 4-20 mA

Actuator)

Included —

Not Used —

Required —

33CSENTHSW

(HH57ZC003)

HH57AC077

Required —

33CSENTSEN

HH57AC078