Carrier 50KC04-06 - Economi$Er IV

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EconoMi$er IV
Table 5 provides a summary of EconoMi$er IV logic. Trouble-
shooting instructions are enclosed.
A functional view of the EconoMi$er system is shown in
Fig. 48. Typical settings, sensor ranges, and jumper positions
are also shown. An EconoMi$er IV simulator program is avail-
able from Carrier to help with EconoMi$er IV training and
troubleshooting.
ECONOMI$ER 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$er IV system can be used for free cooling. The sen-
sor is factory-installed on the EconoMi$er IV system in the
outdoor airstream. (See Fig. 49.) The operating range of tem-
perature measurement is 40°F to 100°F (4°C to 38°C). See
Fig. 51.
Supply Air Temperature (SAT) Sensor
The supply air temperature sensor is a 3 K thermistor located at
the inlet of the indoor fan. (See Fig. 49.) This sensor is factory
installed. The operating range of temperature measurement is
0°F to 158°F (–18°C to 70°C). See Table 6 for sensor tempera-
ture and resistance values.
Fig. 48 — EconoMi$er IV Functional View
* For single enthalpy control, the module compares outdoor enthalpy to
the ABCD set point.
† Power at N terminal determines Occupied/Unoccupied setting: 24 vac
(Occupied), no power (Unoccupied).
** Modulation is based on the supply-air sensor signal.
†† Modulation is based on the DCV signal.
*** Modulation is based on the greater of DCV and supply-air sensor
signals, between minimum position and either maximum position
(DCV) or fully open (supply-air signal).
††† Modulation is based on the greater of DCV and supply-air sensor
signals, between closed and either maximum position (DCV) or
fully open (supply-air signal).
Table 5 — EconoMi$er IV Input/Output Logic
INPUTS OUTPUTS
Demand Control
Ventilation (DCV)
Enthalpy*
Y1 Y2
Compressor N Terminal†
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