Economi$Er Iv Control Modes - Carrier 50HE003-006 Installation Instructions Manual

Supply Air Temperature (SAT) Sensor
The supply air temperature sensor is a 3 K thermistor located at
the inlet of the indoor fan. (See Fig. 39.) This sensor is factory
installed. The operating range of temperature measurement is 0°
to 158_F. See Table 6 for sensor temperature/resistance values.
Table 6—Supply Air Sensor Temperature/
Resistance Values
TEMPERATURE (F)
–58
–40
–22
–4
14
32
50
68
77
86
104
122
140
158
176
185
194
212
230
248
257
266
284
302
17 1/4"
DIVIDER
CLEANABLE
ALUMINUM
FILTER
BAROMETRIC
RELIEF
Fig. 33 --- Filter Installation
The temperature sensor looks like an eyelet terminal with wires
running to it. The sensor is located in the "crimp end" and is
sealed from moisture.
Outdoor Air Lockout Sensor
The Economi$er IV is equipped with an ambient temperature
lockout switch located in the outdoor air stream which is used to
lockout the compressors below a 42_F ambient temperature. (See
Fig. 27.)
RESISTANCE (ohms)
200,250
100,680
53,010
29,091
16,590
9,795
5,970
3,747
3,000
2,416
1,597
1,080
746
525
376
321
274
203
153
116
102
89
70
55
OUTSIDE
AIR
HOOD
FILTER
FILTER
CLIP
C06027

Economi$er IV Control Modes

IMPORTANT: The optional EconoMi$er2 does not include a
controller. The EconoMi$er2 is operated by a 4 to 20 mA signal
from an existing field-supplied controller (such as PremierLink™
control). See Fig. 35 for wiring information.
Determine the EconoMi$er IV control mode before set up of the
control. Some modes of operation may require different
sensors. Refer to Table 7. The EconoMi$er IV is supplied from
the factory with a supply- -air temperature sensor and an outdoor- -
air temperature sensor. This allows for operation of the
EconoMi$er IV with outdoor air dry bulb changeover control.
Additional accessories can be added to allow for different types of
changeover control and operation of the EconoMi$er IV and unit.
Table 7—Economi$er IV Sensor Usage
ECONOMI$ER IV WITH OUTDOOR AIR
APPLICATION
None. The outdoor air dry bulb sensor
Outdoor Air
Dry Bulb
Differential
Dry Bulb
Single Enthalpy
Differential
Enthalpy
CO for DCV
2
Control using a
Wall-Mounted
CO Sensor
2
CO for DCV
33ZCSENCO2†
2
Control using a
and
Duct-Mounted
33ZCASPCO2**
CO Sensor
2
*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.
† 33ZCSENCO2 is an accessory CO
** 33ZCASPCO2 is an accessory aspirator box required for duct-mounted
applications.
†† CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2
and 33ZCASPCO2 accessories.
Outdoor Dry Bulb Changeover
The standard controller is shipped from the factory configured for
outdoor dry bulb changeover control. The outdoor- -air and
supply- -air temperature sensors are included as standard. For this
control mode, the outdoor temperature is compared to an
adjustable set point selected on the control. If the outdoor-air
temperature is above the set point, the EconoMi$er IV will adjust
the outdoor-air dampers to minimum position. If the outdoor air
temperature is below the set point, the position of the outdoor air
dampers will be controlled to provide free cooling using outdoor
air. When in this mode, the LED next to the free cooling set point
potentiometer will be on. The changeover temperature set point is
controlled by the free cooling set point potentiometer located on
the control. (See Fig. 40.) The scale on the potentiometer is A, B,
C, and D. See Fig. 41 for the corresponding temperature
changeover values.
Differential Dry Bulb Control
For differential dry bulb control the standard outdoor dry bulb
sensor is used in conjunction with an additional accessory dry
bulb sensor (part number CRTEMPSN002A00). The accessory
sensor must be mounted in the return airstream. (See Fig. 42.)
Wiring is provided in the EconoMi$er IV wiring harness. (See
Fig. 33.)
In this mode of operation, the outdoor-air temperature is
compared to the return-air temperature and the lower temperature
airstream is used for cooling. When using this mode of
changeover control, turn the enthalpy setpoint potentiometer fully
clockwise to the D setting. (See Fig. 40.)
36
DRY BULB SENSOR
Accessories Required
is factory installed.
CRTEMPSN002A00*
HH57AC078
HH57AC078
and
CRENTDIF004A00*
33ZCSENCO2
O
CRCBDIOX005A00††
R
sensor.
2