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About Advanced Features & Operation
DEADBAND OPERATION - Controls one Heat and
one Cool stage with a three speed fan (see below).
The low speed fan for heat or cool is turned on when:
The temperature spread from the setpoint is equal to
or greater than: the setpoint plus the 1st stage dead-
band (step #6, page 12). This 1st stage deadband is
adjustable from 1-6 degrees and the default is two
degrees.
The medium speed fan for heat or cool is turned on
when: The temperature spread from the setpoint is
equal to or greater than: the setpoint plus the 1st stage
deadband (step #6, page 12), plus the 2nd stage dead-
band. This 2nd stage deadband is fixed at one degree
and is not adjustable.
The high speed fan for heat or cool is turned on when:
The temperature spread from the setpoint is equal to or
greater than: the setpoint plus the 1st stage deadband
(step #6, page 12), plus the 2nd stage deadband, plus
the 3rd stage deadband. This 3rd stage deadband is
fixed at one degree and is not adjustable.
Heating
1
1
DB 3
DB 2
Hi-
Med-
Lo-
speed
speed
speed
fan
fan
fan
DECREASE
TEMPERATURE
The above figure assumes the minimum on time for the
prior stage has been met to allow the next stage to turn
on, once the deadbands have been exceeded.
Cooling
1-6
1-6
1
DB 1
DB 1
DB 2
Heat
Lo-
Cool
SP
speed
SP
fan
INCREASE
Page 17
1
DB 3
Med-
Hi-
speed
speed
fan
fan
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