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SUPPLY AIR
TEMPERATURE
SENSOR
MOUNTING
LOCATION
SUPPLY AIR
TEMPERATURE
SENSOR
Fig. 27 — Supply Air Sensor Location
Table 3 — 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
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$er IV is equipped with an ambient tempera-
ture lockout switch located in the outdoor air stream which
is used to lockout the compressors below a 42 F ambient tem-
perature. See Fig. 17.
E. EconoMi$er IV Control Modes
Determine the EconoMi$er IV control mode before set up of the
control. Some modes of operation may require different sensors.
Refer to Table 4. The EconoMi$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$er IV with outdoor air dry bulb changeover control.
Additional accessories can be added to allow for different
All manuals and user guides at all-guides.com
RESISTANCE (ohms)
200,250
100,680
53,010
29,091
16,590
9,795
5,970
3,747
3,000
2,416
1,597
1,080
746
525
376
321
274
203
153
116
102
89
70
55
—
types of changeover control and operation of the EconoMi$er
IV and unit.
Outdoor Dry Bulb Changeover
The standard controller is shipped from the factory config-
ured 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$er IV will adjust the outdoor-air dampers to
minimum position. If the outdoor-air temperature is below
the set point, the position of the outdoor-air dampers will be
controlled to provide free cooling using outdoor air. When in
this mode, the LED next to the free cooling set point potenti-
ometer will be on. The changeover temperature set point is
controlled by the free cooling set point potentiometer located
on the control. See Fig. 28. The scale on the potentiometer is
A, B, C, and D. See Fig. 29 for the corresponding temperature
changeover values.
Table 4 — EconoMi$er IV Sensor Usage
APPLICATION
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
2
33ZCSENCO2†
Control using a
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.
Fig. 28 — EconoMi$er IV Controller Potentiometer
and LED Locations
—
26
ECONOMI$ER IV WITH OUTDOOR AIR
DRY BULB SENSOR
Accessories Required
None. The outdoor air dry bulb sensor
is factory installed.
CRTEMPSN002A00*
HH57AC078
HH57AC078
and
CRENTDIF004A00*
33ZCSENCO2
and
CRCBDIOX005A00††
sensor.
2
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