Carrier 48TJD Specifications download pdf (Page 19)

Table 8 -- PremierLink TM Sensor Usage

OUTDOOR AIR RETURN AIR OUTDOOR AIR RETURN AIR

APPLICATION TEMPERATURE SENSOR TEMPERATURE SENSOR ENTHALPY SENSOR ENTHALPY SENSOR

DifferentialDryBulb

Temperature with Required --

PremierLink* Included-- 33ZCT55SPT -- --

(PremierLink HH79NZ039 or Equivalent

requires 4-20mA

Actuator)

Single Enthalpy with Required --

PremierLink* 33CSENTHSW

(PremierLink Included -- -- (HH57ZC003) --

requires 4-20mA NotUsed or

Actuator) HH57AC077

Differential Enthalpy Required -- Required --

with PremierLink* Included-- 33CSENTHSW 33CSENTSEN

(PremierLink NotUsed -- (HH57ZC003) or

requires 4-20mA or HH57AC078

Actuator) HH57AC077

*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. CO2 Sensors (Optional):

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

33ZCASPCO2 -- Aspirator box used for duct-mounted CO2 room sensor.

33ZCT55CO2 -- Space temperature and CO2 room sensor with override.

33ZCT56CO2 -- Space temperature and CO2 room 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 E closes at 50 E

ENTHALPY SWITCH/RECEIVER -- The accessory en-

thalpy switclffreceiver (33CSENTHSW) senses temperature

and humidity of the air surrounding the device and calculates

the enthalpy when used without an enth_dpy sensol: The relay is

energized when enthalpy is high and deenergized when en-

thalpy is low (based on ASHRAE [American Society of Heat-

ing, Refrigeration and Air Conditioning Engineersl 90.1 crite-

ria). If an accessory enthalpy sensor (33CSENTSEN) is at-

tached to the return air sensor input, then differential enth_dpy is

calculated. The relay is energized when the enthalpy detected by

the return air enth_dpy sensor is less than the enthalpy at the en-

thalpy switch/receivel: The relay is deenergized when the en-

thalpy detected by the return air enthalpy sensor is greater than

the enthalpy at the enthalpy switch/receiver (differential en-

thalpy control). See Fig. 26 and 27.

OUTDOOR ENTHALPY CONTROL (Fig. 28) -- Outdoor

enthalpy control requires only an enthalpy switclffreceiver

(33CSENTHSW). The enthalpy switclffreceiver 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/Ib OR @ bulb tempera-

ture is above 75 F and is deenergized when the outdoor

enthalpy is below 27 BTU/Ib AND dry bulb temperature is

below 74.5 IF.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 alti-

tude 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

(Natiomd 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 switchheceiver

Wiring -- Cmrier 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 l/4-in, female spade

connectors.

A 24-vac transformer is required to power the enthalpy

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

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

the enthalpy switclffreceiver to the terminals on the transform-

er. On some applications, the power from the economizer har-

ness can be used to power the enthalpy switclffreceivel: To

power the enthalpy switclffreceiver from the economizer har-

ness, connect power of the enthalpy switclffreceiver to the red

and brown wires (1 and 4) on the economizer hmness.

For connection to rooftop units with PlemierLink TM control,

connect the LOW Enthalpy terminal on the enthalpy switch/re-

ceiver to J4 -- pin 2 of the PremierLink control on the HVAC

unit. The switch can be powered through the PremierLink con-

trol board if desired. Wire the 24 VAC terminal on the enthalpy

switch/receiver to J4 -- pin 1 on the PremierLink control. Wile

the GND terminal on the enthalpy switch/receiver to Jl --

pin 2 on the PremierLink control. The HI Enthalpy terminal is

not used. See Fig. 28.

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 55 56

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Carrier 48TJD Specifications Page 19

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