46
EconoMi$er IV (Field-Installed Accessory)
ECONOMI$ER IV STANDARD SENSORS
Troubleshooting instructions are enclosed. A functional view of
the EconoMi$er
®
IV accessory is shown in Fig. 59. Typical set-
tings, sensor ranges, and jumper positions are also shown. An
EconoMi$er IV simulator program is available to help with
EconoMi$er IV training and troubleshooting. See Table 5 for
further details.
Fig. 59 — EconoMi$er IV Functional View
Table 5 — EconoMi$er IV Input/Output Logic
IMPORTANT: For 50FC*20-30 rooftop units EconoMi$er IV
is available as a field-installed accessory only.
INPUTS OUTPUTS
Demand
Controlled
Ventilation
(DCV)
Enthalpy
a
a. For single enthalpy control, the module compares outdoor enthalpy to the ABCD set point.
Y1 Y2
Compressor N Terminal
b
b. Power at N terminal determines Occupied/Unoccupied setting: 24 vac (Occupied), no power (Unoccupied).
Outdoor Return Stage 1 Stage 2 Occupied Unoccupied
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
c
(between
min. position and full-open)
c. Modulation is based on the supply-air sensor signal.
Modulating
c
(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
d
(between min.
position and DCV maximum)
d. Modulation is based on the DCV signal.
Modulating
d
(between
closed and DCV maximum)
On Off On Off
Off Off Off Off
Low
(Free Cooling
LED On)
High
On On On Off
Modulating
e
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).
Modulating
f
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).
On Off Off Off
Off Off Off Off
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