Carrier 48TJ016-028 - Manual (Page 25)

ECONOMISERIV STANDARD SENSORS
Outdoor Air Temperature (OAT) Sensor — The outdoor air
temperature sensor (HH57AC074) is a 10 to 20 mA device
used to measure the outdoor-air temperature. The outdoor-air
temperature is used to determine when the EconoMi$erIV can
be used for free cooling. Tire sensor must be field-relocated.
See Fig. 32. The operating range of temperature measurement
is 40 to 100 F.
Supply Air Temperature (SAT) Sensor — The supply air
temperature sensor is a 3 K tirennistor located at the inlet of the
indoor fan. See Fig. 33. This sensor is factoiy installed. The op­
erating range of temperature measurement is 0° to 158 F. See
Table 11 for sensor temperature/resistance values.
Tire temperature sensor looks like an eyelet terminal with
wires innning to it. Tire sensor is located in the “crimp end”
and is settled from moisture.
Low Temperature Compressor Lockout Switch — The
EconoMi$erIV is equipped with an ambient temperature lock­
out switch located in the outdoor airstretun which is used to
lockout the compressors below a 42 F ambient temperature.
See Fig. 32.
Table 11 — Supply Air Sensor Temperature/
Resistance Values
Table 12 — EconoMI$erlV Sensor Usage
TEMPERATURE (F) RESISTANCE (ohms)
-58 200,250
_40 100,680
-22 53,010
-4 29,091
14 16,590
32 9,795
50 5,970
68 3,747
77 3.000
86 2,416
104 1,597
122 1,080
140 746
158 525
176 376
185 321
194 274
212 203
230 153
248 116
257 102
266 89
284 70
302 55
ECONOMf$ERIV CONTROL MODES
IMPORTANT: Tire optiontil EconoMi$er2 does not include
a controller. Tire EconoMi$er2 is operated by a 4 to 20 mA
signal from an existing field-supplied controller (such as
PremierLink'*''* control). See Pig. 36 for wiring infonnation.
Detennine the EconoMi$erlV control mode before set up of
the control. Some modes of operation may require different sen­
sors. Refer to Table 12. The EconoMi$erl V is supplied from the
factoiy with a supply air temperature sensor, a low temperature
compressor lockout switch, and an outdoor air temperature
sensor. TIris allows for operation of the EconoMi$erTV with
outdoor air diy bulb changeover control. Additional accesso­
ries can be added to ttllow for different types of changeover
control and operation of the EconoMi$er!V and unit.
APPLICATION
ECONOMISERIV WITH OUTDOOR AIR
DRY BULB SENSOR
Accessories Required
Outdoor Air
Dry Bulb
None. The outdoor air dry bulb sensor
is factory installed.
Differential Dry Bulb CRTEMPSN002A00*
Single Enthalpy HH57AC078
Differential Enthalpy
HH57AC078
and
CRENTDIF004A00*
CO 2 tor DCV Control
using a Wall-Mounted
CO 2 Sensor
33ZCSENC02
CO 2 for DCV Control
using a Duct-Mounted
CO 2 Sensor
33ZCSENC02f
and
33ZCASPC02**
GC
0 CRCBDIOX005A00tt
’CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on
many different base units. As such, these kits may contain parts that
will not be needed for installation.
t33ZCSENC02 is an accessory CO 2 sensor.
**33ZCASPC02 is an accessory aspirator box required for duct-
mounted applications.
tfCRCBDIOXOOSAOO is an accessory that contains both 33ZCSENC02
and 33ZCASPC02 accessories.
Outdoor Diy Bulb Changeover — The standard controller is
shipped from the factoiy configured for outdoor diy bulb
changeover control. The outdoor air and supply air temperature
sensors tU'e included as standai'd. Por this control mode, the
outdoor temperature is comptiied to an adjustable set point se­
lected on the control. If the outdoor-air temperature is above
tlie set point, tlie EconoMi$erIV will adjust the outdoor-air
dampers to minimum position. If the outdoor-air temperature is
below tlie set point, the position of the outdoor-air dampers will
be controlled to provide free cooling using outdoor tdr. When
in this mode, the LED next to the free cooling set point potenti­
ometer will be on. The changeover temperature set point is
controlled by the free cooling set point potentiometer located
on the control. See Pig. 37. The settle on the potentiometer is A,
B, C, and D. See Fig. 38 for the corresponding temperature
changeover values.
Differential Dry Bulb Control — For differential diy bulb
control tire standard outdoor diy bulb sensor is used in conjunc­
tion with an additional accessoiy return air sensor (part number
CRTEMPSN002A00). The accessoiy sensor must be mounted
in the return airstream. See Fig. 39.
In this mode of operation, the outdoor-air temperature is
compared to the return-air temperature and the lower tempera­
ture airstream is used for cooling. When using this mode of
changeover control, turn tlie free cooling/enthalpy set point
potentiometer fully clockwise to the D setting. See Fig. 37.
EXHAUST
FAN SETPOINT
LED LIGHTS
WHEN EXHAUST
CONTACT IS MADE
Ml
POSITION SETTING
MAXIMUM DAMPER
DEMAND CONTROL
VENTILATION SETPOINT
LED LIGHTS WHEN
DEMAND CONTROL
VENTILATION INPUT
IS ABOVE SET POINT
NIMUM DAMPER-----------------—-ЛИИ
iSITIOM SETTING -fat— р ША-,
DEMAND CONTROL
VENTILATION SETPOINT
Ik
'O
LED LIGHTS WHEN
OUTDOOR AIRIS
SUITABLE FOR
FREE COOLING
FREE COOLING/ENTHALPY
CHANGEOVER SET POINT
Fig. 37 — EconoMi$erlV Controller Potentiometer
and LED Locations
25