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17 1/4"
DIVIDER
CLEANABLE
ALUMINUM
FILTER
BAROMETRIC
RELIEF
Fig. 24 — Filter Installation
ACTUATOR
RED
24 VAC HOT
24 VAC COM
BLACK
NOTE 9
RUN
WHITE
+
+
2-10V
OUT
-
-
NOTES:
1. The standard EconoMi$er2 is shipped with a fixed dry bulb sensor. (Open 67 F — Close 52 F.) An adjustable dry bulb or enthalpy sensor can
replace the fixed dry bulb. (See Note 6.)
2. CO
sensor is optional. Field-installed accessory. See rooftop price pages for ordering data and pricing. Power for CO
2
vided by field-supplied transformer.
3. The HVAC unit is shipped with a jumper plug attached to the EconoMi$er2 harness. Remove the jumper plug and save for future use if econo-
mizer is removed. Connect the male side of plug (shown above) to the female side in HVAC unit.
4. 1S is an electronic switch that closes when powered by a 24 vac input.
5. Factory-installed 620-ohm, 1 watt, 5% resistor should be removed only when a HH57AC078 enthalpy sensor or CROASENR001A00 adjust-
able dry bulb is added to SR and + for differential sensing.
6. When replacing the fixed dry bulb sensor with an enthalpy or adjustable dry bulb, remove the 820-ohm resistor.
7. Compressor lockout (Open 35 F — Close 50 F).
8. See EconoMi$er2 Installation Instructions for details on locating and wiring supply air (mixed air) sensor.
9. Switch on actuator must be in run position for economizer to operate.
10. A 2-stage thermostat is recommended.
OUTSIDE
AIR
HOOD
FILTER
FILTER
CLIP
ECONOMISER2 CONTROLLER
TR
S O
S R
BLACK
1K
1
1S
NOTE 4
3
2K
T
1S1
P
MINIMUM
POSITION
ADJUSTMENT
Q
FREE
MAXIMUM
COOL
POSITION
AQ
ADJUSTMENT
SD
UNIT
CONTROL
AC
EXHAUST
FAN
PG
INDOOR
FAN
Fig. 25 — EconoMi$er2 Wiring
Mount the return air enthalpy sensor in the return air duct.
The return air enthalpy sensor is wired to terminals S
the EconoMi$er2 controller. See Fig. 31. The outdoor enthalpy
changeover set point is set with the outdoor enthalpy set point
potentiometer on the EconoMi$er2 controller. Turn the potenti-
ometer to the D setting for differential enthalpy. See Fig. 32.
Indoor Air Quality Sensor Input (ISI) — The ISI can be used
for any indoor air quality sensor that provides a 2 to 10 vdc out-
put. The controller will modulate the outdoor damper to pro-
vide ventilation based on the sensor output and the setting of
the ISI potentiometer. The ISI LED will be lit when the ISI sig-
nal is above the ISI potentiometer set point.
A separate field-supplied transformer must be used to pow-
er the CO
sensor.
2
Mount the optional indoor air quality (CO
ing to manufacturer specifications. The CO
wired to the AQ and AQ1 terminals of the controller. Adjust
the ISI potentiometer to correspond to the ISI voltage output of
the indoor air quality sensor at the user-determined set point.
See Fig. 25.
BROWN
BLACK
TR1
NOTE 1
TAN
ECONOMIZER
820 OHM
+
NOTE 6
RESISTOR
DRY BULB
VIOLET
SENSOR
+
620 OHM
RESISTOR
NOTE 5
5
2
WHITE
Compressor Lockout N.C.
4
NOTE 7
T1
P1
Q1
-
2-10 VDC
AQ1
NOTE 2
CO2 SENSOR
+
SD1
AC1
PG1
19
and + on
R
) sensor accord-
2
sensor should be
2
BROWN
4
BLACK
3
GRAY
GRAY
5
BLUE
BLUE
2
YELLOW
YELLOW
8
VIOLET
VIOLET
6
NOTE 8
PINK
PINK
7
RED
1
10
WHITE
BROWN
11
9
ORANGE
12
HARNESS
NOTE 3
AND PLUG
sensor should be pro-
2
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