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Table 22 – EconoMi$er IV Input/Ou tput Logic
INPUTS OUTPUTS
Demand Control
Ventilation (DCV)
Enthalpy*
Y1 Y2
Compressor NTerminal†
Outdoor Return
Stage
1
Stage
2
Occupied Unoccupied
Damper
Below set
(DCV LED Off)
High
(Free Cooling LED
Off)
Low
On On On On
Minimum position ClosedOn Off On Off
Off Off Off Off
Low
(Free Cooling LED
On)
High
On On On Off
Modulating** (between
min. position and
full-open)
Modulating**
(between closed and
full-open)
On Off Off Off
Off Off Off Off Minimum position Closed
Above set
(DCV LED On)
High
(Free Cooling LED
Off)
Low
On On On On
Modulating†† (between
min. position and DCV
maximum)
Modulating††
(between closed and
DCV
maximum)
On Off On Off
Off Off Off Off
Low
(Free Cooling LED
On)
High
On On On Off
Modulating*** Modulating†††On Off Off Off
Off Off Off Off
* For single enthalpy control, the module compares outdoor enthalpy to the ABCD setpoint.
† Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).
** Modulation is based on the supply-air sensor signal.
†† Modulation is based on the DCV signal.
*** Modulation is based on the greater of DCV and supply-air sensor signals, between minimum posit ion and either maximum position (DCV)
or fully open (supply-air signal).
††† Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully
open (supply-air signal).
C06053
Fig. 64 -- EconoMi$er IV Functional View
EconoMi$er IV
Table 22 provides a summary of EconoMi$er IV.
Troubleshooting instructions are enclosed.
A functi onal view of the EconoMi$er is shown in Fig. 64.
Typical settings, sensor ranges, and jumper positions are
also shown. An Ec onoMi$er IV simulator program is
available from Bryant to help with EconoMi$er IV
training and troubleshooti ng.
EconoMi$e r 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$er IV can be used for free
cooling. The sensor is factory-insta lled on the
EconoMi$er IV in the outdoor airstream. (See Fig. 60.)
The operating range of tempera ture measurement is 40_ to
100_F(4_ to 38_C). (See Fig. 67.)
580J