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2500
2000
1500
1000
500
0
0.05
STATIC PRESSURE (in. wg)
Fig. 30 — Barometric Flow Capacity
30
25
20
15
10
5
0
0.13
0.20 0.22
0.25
STATIC PRESSURE (in. wg)
Fig. 31 — Outdoor-Air Damper Leakage
6000
5000
4000
3000
2000
1000
0
0.05
0.10
0.15
STATIC PRESSURE (in. wg)
Fig. 32 — Return-Air Pressure Drop
SUPPLY AIR
TEMPERATURE
SENSOR
MOUNTING
LOCATION
SUPPLY AIR
TEMPERATURE
SENSOR
Fig. 33 — Supply Air Sensor Location
0.15
0.25
0.30 0.35 0.40
0.45
0.50
0.20
0.25
0.30
0.35
ECONOMI$ER IV CONTROL MODES
IMPORTANT: The optional EconoMi$er2 does not
include a controller. The EconoMi$er2 is operated by a 4 to
20 mA signal from an existing field-supplied controller
(such as PremierLink™ control). See Fig. 29 for wiring
information.
Determine the EconoMi$er IV control mode before set up of
the control. Some modes of operation may require different sen-
sors. Refer to Table 6. 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$er IV and
unit.
Outdoor Dry Bulb Changeover — The standard controller is
shipped from the factory configured for outdoor dry bulb
changeover control. The outdoor air and supply air temperature
sensors are included as standard. For this control mode, the
outdoor temperature is compared to an adjustable set point
selected on the control. If the outdoor-air temperature is above
the set point, the EconoMi$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 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. 34. The scale on the potentiometer is A,
B, C, and D. See Fig. 35 for the corresponding temperature
changeover values.
Differential Dry Bulb Control — For differential dry bulb
control the standard outdoor dry bulb sensor is used in conjunc-
tion with an additional accessory dry bulb sensor (part number
CRTEMPSN002A00). The accessory sensor must be mounted
in the return airstream. See Fig. 36. Wiring is provided in the
EconoMi$er IV wiring harness. See Fig. 28.
In this mode of operation, the outdoor-air temperature is
compared to the return air temperature and the lower tempera-
ture airstream is used for cooling. When using this mode of
changeover control, turn the enthalpy set point potentiometer
fully clockwise to the D setting. See Fig. 34.
Table 6 — EconoMi$er IV Sensor Usage
ECONOMI$ER IV WITH OUTDOOR AIR
APPLICATION
Outdoor Air
None. The outdoor air dry bulb sensor
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 con-
tain 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
33ZCSENCO2 and 33ZCASPCO2 accessories.
25
DRY BULB SENSOR
Accessories Required
is factory installed.
CRTEMPSN002A00*
HH57AC078
HH57AC078
and
CRENTDIF004A00*
33ZCSENCO2
and
CRCBDIOX005A00††
sensor.
2
an
accessory
that
contains
both
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