Carrier 48TJ016-028 - Manual (Page 19)

Table 8 — PremlerLinkT“ Sensor Usage
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)
or
HH57AC077
—
Differential Enthalpy
with PremierLink*
(PremierLink
requires 4-20 mA
Actuator)
Included —
Not Used
—
Required —
33CSENTHSW
(HH57ZC003)
or
HH57AC077
Required —
33CSENTSEN
or
HH57AC078
“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. CO 2 Sensors (Optional):
33ZCSENC02 — Room sensor (adjustable). Aspirator box is required for duct mounting of the sensor.
33ZCASPC02 — Aspirator box used for duct-mounted CO
2 room sensor.
33ZCT55C02 — Space temperature and C02 room sensor with override.
33ZCT56C02 — Space temperature and CO
2 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 — 50FIJ540570 — Opens at 35 F, closes at 50 F.
ENTHALPY SWITCH/RECEI VER -- Tlie accessoiy en­
thalpy switcli/receiver (33CSENTHSW) senses temperature
and humidity of the ttir surrounding the device and calculates
the enthalpy when used witliout ttn entlitilpy sensor. 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 Engineers] 90.1 crite­
ria), If tin accessoiy enthtilpy sensor (33CSENTSEN) is at­
tached to the return air sensor input, then differential enthalpy is
calculated. Tlie relay is energized when the enthalpy detected by
the return air enthalpy sensor is less than the entlialpy at tlie en­
thalpy switch/receiver. 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 switcli/receiver
(33CSENTHSW). The enthalpy switcli/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 city bulb tempera­
ture is above 75 F and is deenergized when the outdoor
enthalpy is below 27 BTU/lb AND diy 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 alti­
tude of 1000 ft above sea level.
Mounting — Mount the enthalpy switch/receiver in a location
where tlie outdoor air can be sampled (such as the outdoor air
intake). Tlie 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
^/
4 -in. ТЕК screws. Insert the screws tlirough the holes in the
sides of the enthalpy switch/receiver.
Wiring — Сш'пег 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 Vq-in. female spade
connectors.
A 24-vac transformer is required to power the enthalpy
switch/receiver; as shown in Fig. 29, the PreniierLinkTM board
provides 24 vac. Connect the GND and 24 VAC terminals on
tlie enthalpy switcli/receiver to the terminals on the transfonn-
er. On some applications, the power from the economizer har­
ness can be used to power the enthalpy switcli/receiver. To
power tlie enthalpy switcli/receiver from the economizer har­
ness, connect power of tlie enthalpy switcli/receiver to the red
and brown wires (1 and 4) on the economizer hiuness.
For connection to rooftop units with PremierLink'’'* control,
connect the LOW Enthalpy terminal on the enthalpy switch/re­
ceiver to J4 — pin 2 of tlie PremierLink control on the HVAC
unit. The switch can be powered through tlie PremierLink con­
trol board if desired. Wire the 24 VAC teniiinal on the entlialpy
switch/receiver to J4 — pin 1 on the PremierLink control. Wire
tlie GND terminal on the enthalpy switch/receiver to Jt —
pin 2 on the PremierLink control. The HI Enthalpy terminal is
not used. See Fig. 28.
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