Table 8 -- Supply Air Sensor Temperature/
Resistance Values
TEMPERATURE(F) RESISTANCE(ohms)
-58 200,250
-40 100,680
-22 53,010
-4 29,091
14 15,590
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
248 115
257 102
266 89
284 70
302 55
ECONOM[$ERIV CONTROL MODES
I IMPORTANT: The optional EconoMi$er2 does not include
a controllel: The EconoMiSer2 is operated by a 4 to 20 mA
signal from an existing field-supplied controller (such as
PremierLink TM control). See Fig. 31 for wiling infonnation.
Detennine the EconoMiSerlV control mode before set up of
the control. Some modes of operation may lequire diffelent sen-
sors. Refer to Table 9. The EconoMi$erIV is supplied from the
factory with a supply air temperature sensor, a low temperature
complessor lockout switch, and an outdoor air temperature
sensol: This allows for operation of the EconoMi$erIV with
outdoor air dry bulb changeover control. Additional accesso-
ries can be added to allow for different types of changeover
control and operation of the EconoMiSerIV and unit.
Table 9 -- EconoMiSerlV Sensor Usage
APPLICATION
Outdoor Air
Dry Bulb
Differential Dry Bulb
Single Enthalpy
Differential Enthalpy
CO2 for DCV Control
using a Wall-Mounted
CO2 Sensor
CO2 for DCV Control
using a Duct-Mounted
CO2 Sensor
ECONOMISERIV WITH OUTDOOR AIR
DRY BULB SENSOR
Accessories Required
None. The outdoor air dry bulb sensor
is factory installed.
CRTEMPSN002A00*
HH57AC078
HH57AC078
and
CRENTDIF004A00*
33ZCSENCO2
33ZCSENCO2t
and _ CRCBDIOX005A00tt
33ZCASPCO2**
*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.
1-33ZCSENCO2 is an accessory CO2 sensor.
**33ZCASPCO2 is an accessory aspirator box required for duct-
mounted applications.
1-1-CRCBDiOX005A00 is an accessory that contains both 33ZCSENCO2
and 33ZCASPCO2 accessories.
Outdoor Dly Bulb Changeover -- The standard controller is
shipped from the facto q configured for outdoor @ bulb
changeover control. The outdoor air and supply air temperature
sensors ;ue included as stan&ud. For this control mode, the
outdoor temperature is comptu'ed to an adjustable set point se-
lected on the control. [f the outdoor-air temperature is above
the set point, the EconoMiSerIV 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 ail: 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 flee cooling set point potentiometer located
on the control. See Fig. 32. The sc_de on the potentiometer is A,
B, C, and D. See Fig. 33 for the corresponding temperatme
changeover values.
Differential Dry Bulb Control -- For differential dry bulb
control the standard outdoor @ bulb sensor is used in conjunc-
tion with an additional accessory return air sensor (pall number
CRTEMPSN002A00). The accessory sensor must be mounted
in the return airstream. See Fig. 34.
In this mode of operation, the outdoor-air tempelature 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 file free cooling/enthalpy set point
potentiometer fully clockwise to the D setting. See Fig. 32.
FAN SET POINT
LED
WHEN EXHAUST
CONTACT IS MADE
POSITION SETTING
MAXtMt
DEMAND CONTROL
VENTILATION SET POINT
LED LIGHT_
DEMAND CONTROL
VENTILATION INPUT
IS ABOVE SET POINT
VENTILATION SET POINT
LED LIGHTS WHEN
OUTDOOR AIR IS
SUITABLE FOR
FREE COOLING
FREE COOLING /ENTHALPY
CHANGEOVER SET POINT
Fig. 32 -- EconoMi$er IV Controller Potentiometer
and LED Locations
19
18 ''_'+'_ LED _ON
LED ON
16- -- - LED OFF
_14
13
12
11
lO
9
4o 46 50 55
LED ON
LED ON-- --
LED OFF"_
I
65 70 75 80 85 90 95 100
DEGREES FAHRENHEIT
Fig. 33 -- Outside Air Temperature
Changeover Set Points
21
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