Section 3 – SR-2 Software Description
Cycle Sentry Mode OptiSet Features -
Both Frozen and Fresh Ranges
The features shown below can be modified in Cycle
Sentry Mode operation. They are the same for
Frozen and Fresh ranges.
Cycle Sentry High Speed Pulldown
Micro Rev
All
HMI Rev
All
Choices
Off or On
Factory Set
On
Exceptions
Description This feature allows High Speed Pull
Down for the selected range to be turned On or Off.
If High Speed Pull Down is turned On, the unit will
run in high speed on initial start until setpoint is
reached in both cool and heat mode. If High Speed
Pull Down is turned Off, the unit will switch to low
speed cool when the return air temperature is below
the programmed low speed switch point value, plus
setpoint.
There is a two minute delay on initial startup before
high speed operation is allowed.
If Fuel Saver II is turned On, there may be a delay
before high speed operation is allowed.
This feature does not apply to modulation operation.
Cycle Sentry Fuel Saver II
Micro Rev
All
HMI Rev
All
Choices
Off or On
Factory Set
On
Exceptions
Description This feature allows Fuel Saver II for
the selected range to be turned On or Off.
If Fuel Saver II is On, and the box temperature
changes a predetermined amount from setpoint in
Cycle Sentry mode operation, or temperature
indicates a need for high speed in Continuous mode
operation, the unit will first run in low speed. An 8-
minute timer is started and the control sensor air
temperature is monitored. As long as the
temperature falls (in cool mode operation) or rises
(in heat mode operation) a specified amount before
the timer expires, the 8-minute timer is reset and low
speed operation continues. If the temperature has
not changed the pre-determined amount when the
timer times out, then high speed operation is
resumed if allowed. This provides fuel savings by
delaying high speed operation, yet assures that the
temperature continues to fall or rise as required to
reach setpoint.
If the unit switches to high speed from FS-II the unit
will run in high speed until setpoint is reached. If set
to DISABLED, high speed cool and high speed heat
are allowed with no delay.
If Fuel Saver II is turned Off, there is a two-minute
delay on initial startup before high speed operation
is allowed.
3-31
31 January 2005
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