Specifications

25
620 ohm
JUMPER
}
24 VAC SUPPLY FROM
ECONOMIZER CONTROL
SECTION (RED TO TR,
BRN TO TR1)
TO SENSOR MOUNTED
ON BACK OF CONTROL
}
GRAY WIRE FROM
ECONOMIZER HARNESS
RED WIRE FROM
ECONOMIZER SWITCH 3
(NORMALLY CLOSED)
TR
TR1
SO +
+
SR
2
3
1
LED
A
B
C
D
LED
A
B
C
D
TR TR1
SO
SR
2
3
1
+
+
S
+
(HH57AC078
SENSOR)
24 VAC SUPPLY FROM
ECONOMIZER CONTROL
SECTION (RED TO TR,
BRN TO TR1)
TO SENSOR MOUNTED
ON BACK OF CONTROL
GRAY WIRE FROM
ECONOMIZER HARNESS
RED WIRE FROM
ECONOMIZER SWITCH 3
(NORMALLY CLOSED)
NOTES:
1. Remove factory-installed jumper across SR and +
before connecting wires from HH57AC078 sensor.
2. Switches shown in high outdoor-air enthalpy state.
Terminals 2 and 3 close on low outdoor air enthalpy
relative to indoor air enthalpy.
Fig. 24 — Wiring Connections for
Differential Enthalpy Control
(Durablade Economizer)
NOTE: Switches shown in the high enthalpy state. Termi-
nals 2 and 3 close on enthalpy decrease.
Fig. 25 — Wiring Connections for
Solid-State Enthalpy Control
(Durablade Economizer)
*Wiring is generic for all EconoMi$ers with the exception of the actuator. Refer to Fig. 29 and 30 for specific actuator production dates.
Fig. 26 — EconoMi$er Wiring for Units Produced 5/1999 through 2/2002*