33
ECONOMIZER SYSTEMS
The 50KC units may be equipped with a factory-installed or
accessory (field-installed) economizer system. Three types are
available: with a logic control system (EconoMi$er IV and
EconoMi$er X) and without a control system (EconoMi$er2).
See Fig. 50-52 for component locations on each type. The
W7212 controller is used for EconoMi$er IV and the W7220
controller is used for EconoMi$er X. See Fig. 53-56 for econo-
mizer section wiring diagrams.
All three economizers use direct-drive damper actuators.
Fig. 50 — EconoMi$er X Component Locations
Fig. 51 — EconoMi$er IV Component Locations
Fig. 52 — EconoMi$er2 Component Locations
OUTSIDE AIR
TEMPERATURE SENSOR
WIRING HARNESS
ECONOMI$ER IV
CONTROLLER
OUTSIDE AIR
TEMPERATURE SENSOR
LOW AMBIENT
SENSOR
ACTUATOR
WIRING
HARNESS
ECONOMI$ER2
PLUG
BAROMETRIC
RELIEF
DAMPER
OUTDOOR
AIR HOOD
HOOD
SHIPPING
BRACKET
GEAR DRIVEN
DAMPER
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