Bryant 580J*08--14D Service And Maintenance Instructions page 52

INPUTS
Demand Control
Ventilation (DCV) Outdoor
(Free Cooling LED
Below set
(DCV LED Off)
(Free Cooling LED
(Free Cooling LED
Above set
(DCV LED On)
(Free Cooling LED
* For single enthalpy control, the module compares outdoor enthalpy to the ABCD setpoint.
† Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).
** Modulation is based on the supply-air sensor signal.
†† Modulation is based on the DCV signal.
*** Modulation is based on the greater of DCV and supply-air sensor signals, between minimum position and either maximum position (DCV)
or fully open (supply-air signal).
††† Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully
open (supply-air signal).
EconoMi$er IV
Table 22 provides a summary of EconoMi$er IV.
Troubleshooting instructions are enclosed.
A functional view of the EconoMi$er is shown in Fig. 64.
Typical settings, sensor ranges, and jumper positions are
also shown. An EconoMi$er IV simulator program is
available from Bryant to help with EconoMi$er IV
training and troubleshooting.
Table 22 – EconoMi$er IV Input/Output Logic
Enthalpy*
Y1
Return
On
High
Low On
Off)
Off
On
Low
High
On
On)
Off
On
High
On
Low
Off)
Off
On
Low
High On
On)
Off
Fig. 64 - - EconoMi$er IV Functional View
Compressor
Y2
Stage Stage
1 2
On On On
Off On Off Minimum position
Off Off Off
Modulating** (between
On On Off
min. position and
Off Off Off
Off Off Off Minimum position
On On On
Modulating†† (between
Off On Off
min. position and DCV
maximum)
Off Off Off
On On Off
Off Off Off Modulating***
Off Off Off
EconoMi$er IV Standard Sensors
Outdoor Air Temperature (OAT) Sensor
The outdoor air temperature sensor (HH57AC074) is a 10
to 20 mA device used to measure the outdoor-air
temperature. The outdoor-air temperature is used to
determine when the EconoMi$er IV can be used for free
cooling. The sensor
EconoMi$er IV in the outdoor airstream. (See Fig. 60.)
The operating range of temperature measurement is 40_ to
100_F (4_ to 38_C). (See Fig. 67.)
52
OUTPUTS
N Terminal†
Occupied Unoccupied
Damper
Closed
Modulating**
(between closed and
full-open) full-open)
Closed
Modulating††
(between closed and
DCV
maximum)
Modulating†††
is factory-installed
C06053
on the