Section 3 - Types of Analog Economizers
33 Honeywell Economizers 63-8594-02
W7459
The W7459 was similar to the H705 in that
only the enthalpy high limit function is provided
and the mixed air control circuit is in the
M7415 actuator. This restricted the W7459
use to the M7415, M7405 and M8405
actuators and it installed directly onto them.
Unlike the H705 there was not a sensor built
into the W7459 so wiring connections were
required for one or two enthalpy sensors. It
was also used with direct digital (W7459B),
SPDT mixed air controllers (W7459C) or as a
stand-alone mixed air controller with a mixed
air sensor (W7459A or D).
Commercial
thermostat
One enthalpy or dry bulb and
one mixed/supply air sensor
required. Second enthalpy
sensor optional.
W7459 install
on actuator
M7405, M7415
or M8405
actuators
only
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