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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.
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Table 31 — EconoMi$er IV Input/Output Logic
INPUTS
Enthalpy*
Outdoor
Return
Low
On On
On Off
Off Off
High
On On
On Off
Off Off
Low
On On
On Off
Off Off
High
On On
On Off
Off Off
Fig. 50 — EconoMi$er IV Functional View
Compressor
Y1
Y2
Stage
Stage
1
2
On
On
Minimum position
On
Off
Off
Off
On
Off
Modulating** (between min.
position and full-open)
Off
Off
Off
Off
Minimum position
On
On
Modulating†† (between min.
position and DCV maximum)
On
Off
Off
Off
On
Off
Modulating***
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).
—
—
65
OUTPUTS
N Terminal†
Occupied
Unoccupied
Damper
Closed
Modulating** (between
closed and full-open)
Closed
Modulating†† (between
closed and DCV
maximum)
Modulating†††
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