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Table 5 — Supply Air Sensor Temperature/Resistance
Values
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$er IV is equipped with an ambient tempera-
ture lockout switch located in the outdoor airstream which is
used to lock out the compressors below a 42 F ambient tem-
perature. See Fig. 19.
G. EconoMi$er IV Control Modes
Determine the EconoMi$er IV control mode before set up of the
control. Some modes of operation may require different sensors.
Refer to Table 6. The EconoMi$er IV is supplied from the fac-
tory 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 6 — EconoMi$er IV Sensor Usage
*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on
many different base units. As such, these kits may contain parts that will
not be needed for installation.
†33ZCSENCO2 is an accessory CO
2
sensor.
**33ZCASPCO2 is an accessory aspirator box required for duct-mounted
applications.
††CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2
and 33ZCASPCO2 accessories.
TEMPERATURE (F) RESISTANCE (ohms)
–58 200,250
–40 100,680
–22 53,010
–4 29,091
14 16,590
32 9,795
50 5,970
68 3,747
77 3,000
86 2,416
104 1,597
122 1,080
140 746
158 525
176 376
185 321
194 274
212 203
230 153
248 116
257 102
266 89
284 70
302 55
APPLICATION
ECONOMI$ER IV 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
for DCV Control
using a Wall-Mounted
CO
2
Sensor
33ZCSENCO2
CO
2
for DCV Control
using a Duct-Mounted
CO
2
Sensor
33ZCSENCO2†
and
33ZCASPCO2**
OR
CRCBDIOX005A00††
0
500
1000
1500
2000
2500
0.05
0.15
0.25
STATIC PRESSURE (in. wg)
FLOW IN CUBIC FEET PER MINUTE (cfm)
Fig. 26 — Barometric Relief Flow Capacity
0
5
10
15
20
25
30
0.13 0.20 0.22 0.25 0.30 0.35 0.40 0.45 0.50
STATIC PRESSURE (in. wg)
FLOW IN CUBIC FEET PER MINUTE (cfm)
Fig. 27 — Outdoor Air Damper Leakage
0
1000
2000
3000
4000
5000
6000
0.05 0.10 0.15 0.20 0.25 0.30 0.35
STATIC PRESSURE (in. wg)
FLOW IN CUBIC FEET PER MINUTE (cfm)
Fig. 28 — Return Air Pressure Drop
SUPPLY AIR
TEMPERATURE
SENSOR
MOUNTING
LOCATION
SUPPLY AIR
TEMPERATURE
SENSOR
Fig. 29 — Supply Air Sensor Location