Venstar T1070 - Manual (Page 18)

About Advanced Features & Operation
Page 17
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.
TEMPERATURE DECREASE INCREASE
Cool
SP
Heat
SP
Med-
speed
fan
Med-
speed
fan
Heating Cooling
Lo-
speed
fan
Hi-
speed
fan
Lo-
speed
fan
Hi-
speed
fan
DEADBAND OPERATION - Controls one Heat and
one Cool stage with a three speed fan (see below).
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 #7, page 12), plus the 2nd stage dead-
band. This 2nd stage deadband is fixed at one degree
and is not adjustable.
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 #7, page 12). This 1st stage deadband is
adjustable from 1-6 degrees and the default is two
degrees.
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 #7, 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.
DB 3
1
DB 2
1
DB 1
1-6
DB 1
1-6
DB 2
1
DB 3
1