Section 3 - Types of Analog Economizers
63-8594-02 Honeywell Economizers 32
H705
The H705 was the base controller since the
mixed air circuitry was not included. Its
function was to provide SPDT high limit
switching in a separate mixed air control
circuit, typically series 90. It replaced the H205
without substantial wiring modifications and
could also be used in control circuits with other
company’s devices if a SPDT economizer high
limit was applicable.
Commercial
thermostat
Separate
Series
70 or 90
mixed air
controller
Mod IV actuator
Optional
second
enthalpy
sensor
H705 on plate,
one enthalpy
sensor on back
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