About Advanced Features & Operation
25
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 #8, page 20). 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 #8, page 20), plus the 2nd stage dead-band. This 2nd
stage deadband is xed 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 #8, page 20), plus the 2nd stage deadband, plus the 3rd
stage deadband. This 3rd stage deadband is xed at one degree and is not
adjustable.
The above gure 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
DECREAS
NCREASE
Cool
SP
Heat
SP
Med-
speed
fan
Med-
speed
fan
Heating
Cooling
Lo-
speed
fan
Hi-
speed
fan
Lo-
speed
fan
Hi-
speed
fan
DB3
1˚
DB2
1˚ 1˚ 1˚
DB1
1˚-6˚1˚- 6˚
DB1 DB2DB3
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