Return Air Enthalpy Sensor -- Mount the return-air enthalpy
sensor (HH57AC078) in the return-air duct. The return air
sensor is wired to the enth_dpy controller (HH57AC077). The
outdoor enth_dpy changeover set point is set at the controller.
To wire the return air enthalpy sensor, perform the follow-
ing (see Fig. 25):
1. Use a 2-conductor. 18 or 20 AWG, twisted pair cable to
connect the return air enthalpy sensor to the enthalpy
controller.
2.
3.
At the enthalpy control remove the factory-installed
resistor from the (SR) and (+) termin_ds.
Connect the field-supplied RED wire to (+) spade
connector on the return air enthalpy sensor and the (SR+)
terminal on the enthalpy controllel: Connect the BLK
wire to (S) spade connector on the return air enthalpy
sensor and the (SR) terminal on the enthalpy controllel:
ENTHALPY CONTROLLER [_
RED S (OUTDOOR
AIR
TRr'_TRI_- BRN + ENTHALPY
SENSOR)
sor
SR¢'I+lD"
LED
--q
BLK
RED
I [] S (RETURN AIR ]
r] + ENTHALPY
-- SENSOR
GRAY/ORN
LWIRE HARNESS
GRAY/RED JlN UNIT
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 outside
airstream.
Fig. 25 -- Outdoor and Return Air Sensor Wiring
Connections for Differential Enthalpy Control
HH57AC077
ENTHALPY
CONTROL AND
OUTDOOR AIR
ENTHALPY SENSOR
HH57AC078 ENTHALPY
SENSOR(USED WITH
ENTHALPY CONTROL
FOR DIFFERENTIAL
ENTHALPY OPERATION)
÷
÷
MOUNTING PLATE
Fig. 26 -- Differential Enthalpy Control,
Sensor and Mounting Plate (33AMKITENT006)
OPTIONAL ECONOMISERIV AND ECONOM[$ER2 --
See Fig. 27 and 28 for EconoMiSerIV component locations.
See Fig. 29 for EconoMi$er2 component locations.
NOTE: These instructions are for installing the optional
EconoMiSerIV and EconoMiSer2 only. Refer to the accessory
EconoMiSerIV or EconoMiSer2 installation instructions when
field installing an EconoMi$erIV or EconoMiSer2 accesso q.
To complete inst_dlation of the optional EconoMiSerIV. per-
form the following procedure.
1. Remove the EconoMiSerIV hood. Refer to Step 8 --[n-
stall Outdoor-Air Hood on page 10 for information on
removing and installing the outdoor-air hood.
2. Relocate outdoor air temperature sensor from shipping
position to operation position on EconoMiSerIV. See
Fig. 27.
I MPORTANT: Failure to relocate the sensor will result in
the EconoMiSerlV not operating properly.
3. Reinstall economizer hood.
4. Install all EconoMiSerIV accessories. EconoMiSeltV
wiring is shown in Fig. 30. EconoMiSer2 wiring is shown
in Fig. 31.
Outdoor air leakage is shown in Table 6. Return air pressure
drop is shown in Table 7.
OUTDOOR AIR
TEMPERATURE SENSOR
SCREWS ECONOMI$ERIV FTRAME SCR}EWS (/NSsTALoLN_D OPERATION
I ! LOW TEMPERATURE
I i COMPRESSOR
LOCKOUT SWITCH
_g kv _J
Fig. 27 -- EconoMi$erlV Component Locations --
End View
SUPPLY AIR
TEMPERATURE SENSOR
LOCATION
ECONOMI$ERIV
FLANGE
(HIDDEN)
r
Fig. 28 -- EconoMi$erlV Component Locations --
Side View
18
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