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INPUTS
Demand
Enthalpy
Controlled
Ventilation
Outdoor
(DCV)
High
(Free Cooling
LED Off)
Below Set
(DCV LED
Off)
Low
(Free Cooling
LED On)
High
(Free Cooling
LED Off)
Above Set
(DCV LED
On)
Low
(Free Cooling
LED On)
NOTE(S):
a. For single enthalpy control, the module compares outdoor enthalpy to the ABCD set point.
b. Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).
c. Modulation is based on the supply-air sensor signal.
d. Modulation is based on the DCV signal.
e. 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).
f.
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).
Outdoor Air Temperature (OAT) Sensor
The outdoor air temperature sensor (HH57AC074) is a 10 mA to
20 mA device used to measure the outdoor-air temperature. The
outdoor-air temperature is used to determine when the
EconoMi$er IV can be used for free cooling. The sensor has
8 selectable temperature changeover setpoints, ranging from 48°F
to 78°F. The temperature changeover is set using the 3 dip switch-
es on the sensor See Fig. 56.
Fig. 56 — C7660 Temperature Sensor
Table 6 — EconoMi$er IV Input/Output Logic
a
Y1
Y2
Return
Stage 1
On
On
On
Low
On
Off
On
Off
Off
Off
On
On
On
High
On
Off
Off
Off
Off
Off
On
On
On
Low
On
Off
On
Off
Off
Off
On
On
On
High
On
Off
Off
Off
Off
Off
Compressor
Stage 2
Occupied
On
Off
Minimum position
Off
Off
Modulating
min. position and full-open)
Off
Off
Minimum position
On
Modulating
Off
position and DCV maximum)
Off
Off
Off
Modulating
Off
Supply Air Temperature (SAT) Sensor
The supply air temperature sensor is a field-installed 3 K thermis-
tor located on the fan deck. See Fig. 57. This sensor is factory in-
stalled. The operating range of temperature measurement is 0°F to
158°F
(–18°C
temperature/resistance values.
Supply Air
Temperature
(SAT) Sensor
Fig. 57 — Supply Air Sensor Location
36
OUTPUTS
N Terminal
b
Unoccupied
c
(between
Modulating
closed and full-open)
d
(between min.
Modulating
closed and DCV maximum)
e
Modulating
to
70°C).
See
Table
Closed
c
(between
Closed
d
(between
f
7
for
sensor
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Troubleshooting
