Specifications

21
+
+
+
+
+
-
-
-
2-10V
OUT
RED
RUN
BLACK
WHITE
24 VAC HOT
TR
BLACK
BROWN
BROWN
BLACK
BLACK
GRAY
BLUE
YELLOW
VIOLET
VIOLET
VIOLET
PINK
PINK
RED
WHITE
WHITE
BROWN
ORANGE
620 OHM
RESISTOR
820 OHM
RESISTOR
S
O
NOTE 8
5
1
3
1K
1S
1S1
2K
2
4
T
P
P1
Q
Q1
AQ
SD1
SD
AC
AC1
PG
PG1
ECONOMIZER
DRY BULB
SENSOR
Compressor Lockout N.C.
YELLOW
GRAY
BLUE
TA N
INDOOR
FAN
EXHAUST
FAN
UNIT
CONTROL
FREE
COOL
MAXIMUM
POSITION
ADJUSTMENT
2-10 VDC
CO2 SENSOR
HARNESS
AND PLUG
MINIMUM
POSITION
ADJUSTMENT
AQ1
T1
S
R
TR124 VAC COM
ACTUATOR
4
3
5
2
8
6
7
1
10
11
9
12
}
NOTE 9
NOTE 6
NOTE 1
NOTE 5
NOTE 7
NOTE 2
NOTE 4
NOTE 3
ECONOMISER2 CONTROLLER
NOTES:
1. The standard EconoMi$er2 is shipped with a fixed dry bulb sensor. (Open 67 F — Close 52 F.) An adjustable dry bulb or enthalpy sensor can
replace the fixed dry bulb. (See Note 6.)
2. CO
2
sensor is optional. Field-installed accessory. See rooftop price pages for ordering data and pricing. Power for CO
2
sensor should be pro-
vided by field-supplied transformer.
3. The HVAC unit is shipped with a jumper plug attached to the EconoMi$er2 harness. Remove the jumper plug and save for future use if econ-
omizer 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$er2 Installation Instructions for details on locating and wiring supply air (mixed air) sensor.
9. Switch on actuator must be in run position for economizer to operate.
10. A 2-stage thermostat is recommended.
11. Before troubleshooting wiring, ensure that all the correct sensors have been installed (refer to EconoMi$er2 Installation Instructions).
Fig. 25 — EconoMi$er2 Wiring (For Units Produced 2/18/02 - Present)
HH57AC078 DIFFERENTIAL
ENTHALPY OR
CROASENPOO1A00
DIFFERENTIAL
ADJUSTABLE DRY BULB
HH57AC078 ENTHALPY OR
CROASENPOO1A00
ADJUSTABLE
DRY BULB
(NOTE 1)
(NOTE 2)
ECONOMISER2
CONTROLLER
+
+
+
+
S
S
SO
TA N
TA N
VIOLET
VIOLET
SR
NOTES:
1. Violet wire from SO terminal has a factory-installed 820-ohm in-line
resistor. This resistor must be removed when replacing the standard
fixed dry bulb with an optional enthalpy or adjustable dry bulb.
2. The standard economizer has a 620-ohm resistor between terminals SR
and +. This resistor must be removed when adding differential enthalpy
or differential adjustable dry bulb.
Fig. 26 — Differential Enthalpy Wiring for EconoMi$er2