Filter
Top Products
—14—
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. 19.
To remove the component box from its shipping posi-
tion, remove the screw holding the hood box bracket
to the top of the economizer. Slide the hood box out of
the unit. See Fig. 21.
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 bot-
tom of the indoor coil access panel. See Fig. 22.
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 provided to attach the hood sides to the unit.
See Fig. 23.
5. Remove the shipping tape holding the economizer
barometric relief damper in place.
6. Insert the hood divider between the hood sides. See
Fig. 23 and 24. Secure hood divider with 2 screws on
each hood side. The hood divider is also used as the
bottom filter rack for the aluminum filter.
7. Open the filter clips which are located underneath
the hood top. Insert the aluminum filter into the bot-
tom 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. 24.
8. Caulk the ends of the joint between the unit top panel
and the hood top. See Fig. 22.
9. Replace the filter access panel.
10. Install all EconoMi$er IV accessories. EconoMi$er IV
wiring is shown in Fig. 25.
Barometric flow capacity is shown in Fig. 26. Outdoor air
leakage is shown in Fig. 27. Return air pressure drop is
shown in Fig. 28.
F. 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$er IV in the outdoor air-
stream. See Fig. 19. The operating range of temperature
measurement is 40 to 100 F.
Supply Air Temperature (SAT) Sensor
The supply air temperature sensor is a 3 K thermistor
located at the inlet of the indoor fan. See Fig. 29. This sensor
is factory installed. The operating range of temperature
measurement is 0° to 158 F. See Table 5 for sensor tempera-
ture/resistance values.
ECONOMI$ER IV
CONTROLLER
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
ACTUATOR
WIRING
HARNESS
Fig. 19 — EconoMi$er IV Component Locations
FILTER ACCESS PANEL
INDOOR COIL ACCESS PANEL
Fig. 20 — Typical Access Panel Locations
H
o
o
d
B
o
x
HOOD BOX
BRACKET
Fig. 21 — Hood Box Removal
SIDE
PANEL
INDOOR
COIL
ACCESS
PANEL
INDOOR
COIL
ACCESS
PANEL
CAULK
HERE
TOP
SIDE
PANEL
Fig. 22 — Indoor Coil Access Panel Relocation