Adjusting The Deadband - Venstar T2900 Owner's Manual

Adjusting the Deadband

MULTI-STAGE OPERATION - Controls up to three Heat and two Cool
stages.
The 2nd Stage of heat or cool is turned on when:
(A) The 1st Stage has been on for the time required (step #27,
page 13.6). It is adjustable from 0-60 minutes and the default
is two minutes.
And
(B) The temperature spread from the setpoint is equal to or greater
than: the setpoint plus the 1st stage deadband (step #24, next
page), plus the 2nd stage deadband (step #25, next page).
This 2nd stage deadband is adjustable from 0-10 degrees and
the default is two degrees.
The 3rd Stage of Heat is turned on when:
(A) The 2nd stage has been on for the time required (step #28,
page 13.6). It is adjustable from 0-60 minutes and the default
is two minutes.
And
(B) The temperature from the setpoint is equal to or greater
than: the setpoint plus the 1st stage deadband (step #24,
next page), plus the 2nd stage deadband (step #25, next
page) plus the 3rd stage deadband (step #26, next page).
This 3rd stage deadband is adjustable from 0-10 degrees
and the default is two degrees.
Heating
Deadband Deadband
db 3 db 2
(adj. 0-10 ) (adj. 0-10 )
3rd Stage 2nd Stage 1st Stage
turn on turn on turn on
DECREASE
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
Deadband Deadband Deadband
db 1 db 1 db 2
(adj. 1-6 ) (adj. 1-6 ) (adj. 0-10 )
Heat Cool 1st Stage
turn on
Setpoint Setpoint
TEMPERATURE
INCREASE
Page 13.4
13
2nd Stage
turn on