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Step 8 -- Optional EconoMi$er IV -- The optional

EconoMiSer IV comes flom file factory fully wired. Outdoor

air hoods must be installed. No field wiring is required for

standard outdoor dry bulb changeover operation. Field wiring

of accessory sensors is required for different operational

modes.

INSTALL OUTDOOR AIR HOODS -- Perform file follow-

ing procedure to install the outdoor-air hoods:

1. Economizer and barometric relief hoods abe located in the

condenser section under the slanted coil for shipping. See

Fig. 10. 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 flom condenser section.

2. Remove the screws that secure file economizer and

b;uometfic relief/power exhaust hoods to the wooden

r;filing. Discard or recycle wooden rails. Save screws.

3. The barometric relief dmnper is secured to the economizer

panel for shipping. Remove the screw holding the baro-

metric relief &tmper to the panel. Dmnper should be free

to swing open during operation. See Fig. 11.

4. Hang the barometric relief/power exhaust hood on the

mounting flange on the economizer panel. Secure hood to

panel with screws saved from Step 2. See Fig. 11 and 12.

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 fl_)m flange.

Align holes in hood with holes in panel and secure

hood to panel with screws saved from Step 2. See

Fig. 11 and 13.

ECONOMI$ER IV STANDARD SENSORS

Outdoor-Air Temperature (OAT)Sensor- The outdoo>air

temperature sensor is a 10 to 20 mA device used to measure the

outdoo>air temperature. The outdoo>air temperature is used to

determine when the EconoMi$er IV can be used for flee cool-

ing. The sensor is factou-installed on the EconoMi$er IV in

the outdoor airstmam. 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. 11 -- Hood Installation

POWER EXHAUST/

BAROMETRIC

RELIEF HOOD

POWER EXHAUST/

BAROMETRIC

f RELIEF HOOD

Fig. 12- Barometric Relief/Power Exhaust

Hood Flange

WOODEN RAILS

_ ECONOMIZER

HOOD

Fig. 10 -- Economizer and Barometric

Relief/Power Exhaust Hoods Shipping Positions

MOUNTING

FLANGE

ECONOMIZER

HOOD

Fig. 13- Economizer Flange

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 48 49

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