Bryant DURAPAC 579F Installation, Start-Up And Service Instructions Manual page 17

APPLICATION
Outdoor Air Dry Bulb
Differential Dry Bulb
Single Enthalpy
Differential Enthalpy
CO for DCV Control using a
2
Wall-Mounted CO Sensor
2
CO for DCV Control using a
2
Duct-Mounted 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.
†CGCDXSEN004A00 is an accessory CO
**CGCDXASP001A00 is an accessory aspirator box required for duct-mounted applications.
Fig. 27 — EconoMi$erIV Controller Potentiometer
and LED Locations
19
LED ON
18
D
17
LED ON
LED OFF
16
C
15
14
LED OFF
13
12
11
10
9
40 45 50 55 60 65
DEGREES FAHRENHEIT
Fig. 28 — Outside Air Temperature
Changeover Set Points
Table 11 — EconoMi$erIV Sensor Usage
ECONOMI$ERIV WITH OUTDOOR AIR
DRY BULB SENSOR
Accessories Required
None. The outdoor air dry bulb sensor is factory installed.
CRTEMPSN002A00*
HH57AC078
HH57AC078
and
CRENTDIF004A00*
sensor.
2
LED ON
B
LED ON
LED OFF
A
LED OFF
100
70 75 80 85 90 95
None. The single enthalpy sensor is factory installed.
CGCDXSEN004A00
CGCDXSEN004A00†
and
CGCDXASP001A00**
IAQ
SENSOR
Fig. 29 — Return Air Temperature or Enthalpy
Sensor Mounting Location
Differential Enthalpy Control
For differential enthalpy control, the EconoMi$erIV controller
uses two enthalpy
CRENTDIF004A00), one in the outside air and one in the
return airstream
EconoMi$erIV controller compares the outdoor air enthalpy to
the return air enthalpy to determine EconoMi$erIV use. The
controller selects the lower enthalpy air (return or outdoor) for
cooling. For example, when the outdoor air has a lower
enthalpy than the return air and is below the set point, the
EconoMi$erIV opens to bring in outdoor air for free cooling.
Replace the standard outside air dry bulb temperature sen-
sor with the accessory enthalpy sensor in the same mounting
location. See Fig. 24. Mount the return air enthalpy sensor
in the return airstream. See Fig. 29. The outdoor enthalpy
changeover set point is set with the outdoor enthalpy set
point potentiometer on the EconoMi$erIV controller. When
using this mode of changeover control, turn the enthalpy set
point potentiometer fully clockwise to the D setting.
NOTE: Remove 620-ohm resistor if differential enthalpy sen-
sor is installed.
— 17 —
ECONOMI$ERIV WITH SINGLE
ENTHALPY SENSOR
Accessories Required
CRTEMPSN002A00*
(2) CRTEMPSN002A00*
CRENTDIF004A00*
RETURN AIR
TEMPERATURE
OR ENTHALPY
SENSOR
sensors (HH57AC078
on the EconoMi$erIV
and
frame. The