Bryant DURAPAC 579F Installation, Start-Up And Service Instructions Manual page 42

Demand Control
Ventilation (DCV)
Below set High
(DCV LED Off) (Free Cooling LED Off)
Low
(Free Cooling LED On)
Above set High
(DCV LED On) (Free Cooling LED Off)
Low
(Free Cooling LED On)
*For single enthalpy control, the module compares outdoor enthalpy
to the ABCD set point.
†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.
Table 29 — EconoMi$erIV Input/Output Logic
INPUTS
Enthalpy*
Y1
Outdoor Return
Low On
On
Off
High On
On
Off
Low On
On
Off
High On
On
Off
Fig. 49 — EconoMi$erIV Functional View
Compressor
Y2
Stage Stage
1 2
On On On Minimum position
Off On Off
Off Off Off
On On Off Modulating** (between min.
position and full-open)
Off Off Off
Off Off Off Minimum position
On On On Modulating†† (between min.
position and DCV maximum)
Off On Off
Off Off Off
On On Off Modulating***
Off Off Off
Off Off Off
***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).
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OUTPUTS
N Terminal†
Occupied Unoccupied
Damper
Closed
Modulating** (between
closed and full-open)
Closed
Modulating†† (between
closed and DCV
maximum)
Modulating†††