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Table 27 – EconoMi$er IV Input/Output Logic
INPUTS OUTPUTS
Demand Control
Ventilation (DCV)
Enthalpy*
Y1 Y2
Compressor NTerminal†
Outdoor Return
Stage
1
Stage
2
Occupied Unoccupied
Damper
Below s et
(DCV LED Off)
High
(Free C ooling LED
Off)
Low
On On On On
Minimum position ClosedOn Off On Off
Off Off Off Off
Low
(Free C ooling LED
On)
High
On On On Off
Modulating** ( between
min. position and
full-open)
Modulating**
(between closed and
full-open)
On Off Off Off
Off Off Off Off Minimum po sition Closed
Above set
(DCV LED On)
High
(Free C ooling LED
Off)
Low
On On On On
Modulating†† ( between
min. position and DCV
maximum)
Modulating††
(between closed and
DCV
maximum)
On Off On Off
Off Off Off Off
Low
(Free C ooling LED
On)
High
On On On Off
Modulating*** Modulating†††On Off Off Off
Off Off Off Off
* For single enthalpy con trol, the module compares outdoor enthalpy to the ABCD setpoint.
† Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).
** Modulation is based on the supply-air sensor signal.
†† Modulation is based on the DCV signal.
*** Modulation is based on the greater of DCV and supply-air sensor signals, between minimum position and either maximum position (DCV)
or fully o pen (supply-air signal).
††† Modulation is based on the greater of DCV and supply-air sensor signals, between closed and either maximum position (DCV) or fully
open (supply-air signal).
C06053
Fig. 75 -- EconoMi$er IV Functional View
EconoMi$er IV
Table 27 provides a summary of EconoMi$er IV.
Troubleshooting instructions are enclosed.
A functional view of the EconoMi$er is shown in Fig. 75.
Typical settings, sensor ranges, and jumper positions are
also shown. An EconoMi$er IV simulator program is
available from Carrier to help with EconoMi$e r IV
training and troubleshooting.
EconoMi$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$er IV can be used for free
cooling. The sensor is factory-installed on the
EconoMi$er IV in the outdoor airstream. (See Fig. 71.)
The operating range of temperat ure measurement is 40_ to
100_F(4_ to 38_C). (See Fig. 78.)
48TC