Bryant 581C024--060 - Manual (Page 59)

59
Table 44—EconoMi$er IV Input/Output Logic
INPUTS OUTPUTS
Demand Control
Enthalpy* Compressor N Terminal†
Demand Control
V til ti (DCV) Outdoor Return Y1 Y2
Stage Stage Occupied Unoccupied
Ventilation (DCV) Outdoor Return Y1 Y2
1 2 Damper
Below set
(DCV LED Off)
High
(F C li LED Off)
Low On On On On Minimum position Closed Below set
(DCV LED Off)
High
(Free Cooling LED Off)
Low
On Off On Off
Minimum position Closed
Off Off Off Off
Low
(F C li LED O )
High On On On Off Modulating** (between min.
i i d f ll )
Modulating** (between
l d d f ll )
Low
(Free Cooling LED On)
High
On Off Off Off
Modulating (between min.
position and full-open)
Modulating (between
closed and full-open)
Off Off Off Off Minimum position Closed
Above set
(DCV LED O )
High
(F C li LED Off)
Low On On On On Modulating†† (between min.
i i d DCV i )
Modulating†† (between
l d d DCV
Above set
(DCV LED On)
High
(Free Cooling LED Off)
Low
On Off On Off
Modulating†† (between min.
position and DCV maximum)
Modulating†† (between
closed and DCV
maximum)
Off Off Off Off
maximum)
Low
(F C li LED O )
High On On On Off Modulating*** Modulating††† Low
(Free Cooling LED On)
High
On Off Off Off
Modulating Modulating†††
Off Off Off Off
*For single enthalpy control, the module compares outdoor enthalpy to the ABCD set point.
†Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).
**Modulation is based on the supply-air sensor signal.
††Modulation is based on the DCV signal.
***Modulation is based on the greater of DCV and supply-air sensor signals, between minimum position and either maximum position (DCV) or fully open (sup-
ply-air signal).
†††Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully open (supply-air sig-
nal).
C06053
Fig. 67 --- EconoMi$er IV Functional View
581B
,C