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OPTIONAL ECONOMI$ER IV AND ECONOMI$ER2 —
See Fig. 21 for EconoMi$er IV component locations. See
Fig. 22 for EconoMi$er2 component locations.
NOTE: These instructions are for installing the optional
EconoMi$er IV and EconoMi$er2 only. Refer to the accessory
EconoMi$er IV or EconoMi$er2 installation instructions when
field installing an EconoMi$er IV or EconoMi$er2 accessory.
1. To remove the existing unit filter access panel, raise the
panel and swing the bottom outward. The panel is now
disengaged from the track and can be removed. See
Fig. 23.
2. The box with the economizer hood components is
shipped in the compartment behind the economizer. The
EconoMi$er IV controller is mounted on top of the
EconoMi$er IV in the position shown in Fig. 21. The
optional EconoMi$er2 with 4 to 20 mA actuator signal
control does not include the EconoMi$er IV controller.
To remove the component box from its shipping position,
remove the screw holding the hood box bracket to the top
of the economizer. Slide the hood box out of the unit. See
Fig. 24.
IMPORTANT: If the power exhaust accessory is to be
installed on the unit, the hood shipped with the unit will not
be used and must be discarded. Save the aluminum filter
for use in the power exhaust hood assembly.
3. The indoor coil access panel will be used as the top of the
hood. Remove the screws along the sides and bottom of
the indoor coil access panel. See Fig. 25.
4. Swing out indoor coil access panel and insert the hood
sides under the panel (hood top). Use the screws provided
to attach the hood sides to the hood top. Use screws pro-
vided to attach the hood sides to the unit. See Fig. 26.
5. Remove the shipping tape holding the economizer baro-
metric relief damper in place.
6. Insert the hood divider between the hood sides. See
Fig. 26 and 27. Secure hood divider with 2 screws on
each hood side. The hood divider is also used as the bot-
tom filter rack for the aluminum filter.
7. Open the filter clips which are located underneath the
hood top. Insert the aluminum filter into the bottom filter
rack (hood divider). Push the filter into position past the
open filter clips. Close the filter clips to lock the filter into
place. See Fig. 27.
8. Caulk the ends of the joint between the unit top panel and
the hood top. See Fig. 25.
ECONOMI$ER2
PLUG
BAROMETRIC
RELIEF
DAMPER
Fig. 22 — EconMi$er2 Component Locations
22
WIRING
HARNESS
ACTUATOR
Fig. 21 — EconoMi$er IV Component Locations
9. Replace the filter access panel.
10. Install all EconoMi$er IV accessories. EconoMi$er IV
wiring is shown in Fig. 28. EconoMi$er2 wiring is shown
in Fig. 29.
Barometric flow capacity is shown in Fig. 30. Outdoor air
leakage is shown in Fig. 31. Return air pressure drop is shown
in Fig. 32.
ECONOMI$ER IV STANDARD SENSORS
Outdoor Air Temperature (OAT) Sensor — The outdoor air
temperature sensor (HH57AC074) is a 10 to 20 mA device
used to measure the outdoor-air temperature. The outdoor-air
temperature is used to determine when the EconoMi$er IV can
be used for free cooling. The sensor is factory-installed on the
EconoMi$er IV in the outdoor airstream. See Fig. 21. The
operating range of temperature measurement is 40 to 100 F.
Supply Air Temperature (SAT) Sensor — The supply air
temperature sensor is a 3 K thermistor located at the inlet of the
indoor fan. See Fig. 33. This sensor is factory installed. The
operating range of temperature measurement is 0° to 158 F. See
Table 5 for sensor temperature/resistance values.
The temperature sensor looks like an eyelet terminal with
wires running to it. The sensor is located in the "crimp end"
and is sealed from moisture.
Outdoor Air Lockout Sensor — The Economi$er IV is
equipped with an ambient temperature lockout switch located
in the outdoor air stream which is used to lockout the compres-
sors below a 42 F ambient temperature. See Fig. 21.
GEAR DRIVEN
DAMPER
ECONOMI$ER IV
CONTROLLER
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
OUTDOOR
AIR HOOD
HOOD
SHIPPING
BRACKET
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