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The mode jumper should be set to M3 for 4 to 20 mA
output. The factory test jumper should remain on OFF or the
enthalpy sensor will not calculate enthalpy.
ENTHALPY SENSORS AND CONTROL — The enthalpy
control (HH57AC077) is supplied as a field-installed accessory
to be used with the EconoMi$er2 damper control option. The
outdoor air enthalpy sensor is part of the enthalpy control. The
separate field-installed accessory return air enthalpy sensor
(HH57AC078) is required for differential enthalpy control.
NOTE: The enthalpy control must be set to the “D” setting for
differential enthalpy control to work properly.
The enthalpy control receives the indoor and return
enthalpy from the outdoor and return air enthalpy sensors and
provides a dry contact switch input to the PremierLink™
controller. Locate the controller in place of an existing econo-
mizer controller or near the actuator. The mounting plate may
not be needed if existing bracket is used.
A closed contact indicates that outside air is preferred to the
return air. An open contact indicates that the economizer
should remain at minimum position.
Outdoor Air Enthalpy Sensor/Enthalpy Controller
(HH57AC077) — To wire the outdoor air enthalpy sensor,
perform the following (see Fig. 31 and 32):
NOTE: The outdoor air sensor can be removed from the back
of the enthalpy controller and mounted remotely.
1. Use a 4-conductor, 18 or 20 AWG cable to connect the
enthalpy control to the PremierLink controller and power
transformer.
2. Connect the following 4 wires from the wire harness
located in rooftop unit to the enthalpy controller:
a. Connect the BRN wire to the 24 vac terminal (TR1)
on enthalpy control and to pin 1 on 12-pin harness.
b. Connect the RED wire to the 24 vac GND terminal
(TR) on enthalpy sensor and to pin 4 on 12-pin
harness.
c. Connect the GRAY/ORN wire to J4-2 on Premier-
Link controller and to terminal (3) on enthalpy
sensor.
d. Connect the GRAY/RED wire to J4-1 on Premier-
Link controller and to terminal (2) on enthalpy sensor.
NOTE: If installing in a Carrier rooftop, use the two gray wires
provided from the control section to the economizer to connect
PremierLinkcontrollertoterminals2and3onenthalpysensor.
Return Air Enthalpy Sensor
— Mount the return-air enthalpy
sensor (HH57AC078) in the return-air duct. The return air
sensor is wired to the enthalpy controller (HH57AC077). The
outdoor enthalpy changeover set point is set at the controller.
To wire the return air enthalpy sensor, perform the follow-
ing (see Fig. 31):
1. Use a 2-conductor, 18 or 20 AWG, twisted pair cable to
connect the return air enthalpy sensor to the enthalpy
controller.
2. At the enthalpy control remove the factory-installed
resistor from the (SR) and (+) terminals.
3. Connect the field-supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the (SR+)
terminal on the enthalpy controller. Connect the BLK
wire to (S) spade connector on the return air enthalpy
sensor and the (SR) terminal on the enthalpy controller.
OPTIONAL ECONOMI$ERIV AND ECONOMI$ER2 —
See Fig. 33 and 34 for EconoMi$erIV component locations.
See Fig. 35 for EconoMi$er2 component locations.
NOTE: These instructions are for installing the optional
EconoMi$erIV and EconoMi$er2 only. Refer to the accessory
EconoMi$erIV or EconoMi$er2 installation instructions when
field installing an EconoMi$erIV or EconoMi$er2 accessory.
To complete installation of the optional EconoMi$erIV, per-
form the following procedure.
1. Remove the EconoMi$erIV hood. Refer to Step 11 — In-
stall Outdoor-Air Hood on page 16 for information on
removing and installing the outdoor-air hood.
2. Relocate outdoor air temperature sensor from shipping
position to operation position on EconoMi$erIV. See
Fig. 33.
3. Reinstall economizer hood.
4. Install all EconoMi$erIV accessories. EconoMi$erIV
wiring is shown in Fig. 36. EconoMi$er2 wiring is shown
in Fig. 37.
IMPORTANT: Failure to relocate the sensor will result in
the EconoMi$erIV not operating properly.
BRACKET
+
C7400A1004
Fig. 32 — Differential Enthalpy Control,
Sensor and Mounting Plate (33AMKITENT006)
HH57AC077
ENTHALPY
CONTROL AND
OUTDOOR AIR
ENTHALPY SENSOR
HH57AC078 ENTHALPY
SENSOR (USED WITH
ENTHALPY CONTROL
FOR DIFFERENTIAL
ENTHALPY OPERATION)
MOUNTING PLATE
LED
A
B
C
D
TR TR1
SO
SR
2
3
1
+
+
BRN
RED
GRAY/ORN
GRAY/RED
WIRE HARNESS
IN UNIT
BLK
RED
S
+
(RETURNAIR
ENTHALPY
SENSOR)
S
+
(OUTDOOR
AIR
ENTHALPY
SENSOR)
ENTHALPY CONTROLLER
NOTES:
1. Remove factory-installed jumper across SR and + before con-
necting wires from return air 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.
3. Remove sensor mounted on back of control and locate in out-
side airstream.
Fig. 31 — Outdoor and Return Air Sensor Wiring
Connections for Differential Enthalpy Control