Step 10- Optional EconoMi$er IV- The option-
al EconoMi$er IV comes from the factory fnlly wiled. Out-
door air hoods must be installed. No field wiring or assembly
is required for standard outdoor c_h'ybulb changeover opera-
tion. Field wiring of accessory sensors is required for diffelent
operational modes.
INSTALL OUTDOOR AIR HOODS -- Perform the follow-
ing procedure to install the outdoor-air hoods:
1. Economizer and barometric relief hoods are located in the
condenser section under the slanted coil for shipping. See
Fig. 14. Barometric relief/power exhaust hood is shipped
inside of economizer hood. Remove screws that secure
the wooden rails of the hood assemblies to the unit. Save
screws. Slide complete assembly from condenser section.
2. Remove the screws that secure the economizer and
barometric relief/power exhaust hoods to the wooden
railing. Discmd or lecycle wooden rails. Save screws.
3. The barometric relief dmnper is secured to the economiz-
er panel for shipping. Remove the screw holding the
barometric relief damper to the panel. Damper should be
fiee to swing open during operation. See Fig. 15.
4. Hang the barometric relieffpower exhaust hood on the
mounting fange on the economizer panel. Secure hood to
panel with sclews saved from Step 2. See Fig. 15 and 16.
5. Align hole in flange of economizer panel with left edge of
hood. Hang economizer hood on the top flange of the
economizer panel by rotating hood until top flange of the
economizer hood engages the bent flange on the econo-
mizer panel. Rotate hood until hood is flush with the
economizer panel. Hood will support itself fiom flange.
Align holes in hood with holes in panel and secure
hood to panel with sclews saved from Step 2. See Fig. 15
and 17.
ECONOMISER IV STANDARD SENSORS
Outdoor Air Temperature (OAT) Sensor -- The outdoor air
temperature sensor is a 10 to 20 mA device used to measure the
outdoor-air temperature. The outdoor-air temperature is used to
determine when the EconoMiSer IV can be used for flee cool-
ing. The sensor is factory-installed on the EconoMi$er IV in
the outdoor airstremn. The operating range of temperature
measurement is 40 to 100 E
MOUNTING /
FLANGE
ECONOMIZER
HOOD
POWER EXHAUST/
BAROMETRIC
RELIEF HOOD
\
ECONOMIZER BAROMETRIC
PANEL RELIEF DAMPER SCREW
Fig. 15- Hood Installation
POWER EXHAUST/
BAROMETRIC
RELIEF HOOD
/
/
/
/ POWER EXHAUST/
// BAROMETRIC
/,//' / RELIEF HOOD
Fig. 16- Barometric Relief/Power Exhaust
Hood Flange
WOODEN RAILS
_ ECONOMIZER
HOOD
Fig. 14 -- Economizer and Barometric
Relief/Power Exhaust Hoods Shipping Positions
MOUNTING
FLANGE
ECONOMIZER
HOOD
Fig. 17- Economizer Flange
13
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