Section 3 – SR-2 Software Description
Setpoint High Limit
Micro Rev
All
HMI Rev
All
Choices
Maximum of 90°F (32°C)
Minimum is Setpoint Low Limit
Factory Set
80°F (27°C)
Exceptions If OptiSet is active this feature is set
from the OptiSet Menu. The setting selected is used
for all ranges.
Description Setpoint High Limit allows the
upper setpoint limit to be set to a maximum of 90°F
(32°C) in one degree increments. The minimum
setting is determined by the setting of Setpoint Low
Limit. If the driver attempts to select a setpoint
higher than the Setpoint High Limit, the display will
show Setpoint Limit, indicating that the selected
Setpoint High Limit has been reached. Setting
Setpoint High Limit and the Setpoint Low Limit to the
same temperature results in a single setpoint
temperature available.
Setpoint Low Limit
Micro Rev
All
HMI Rev
All
Choices
Minimum of –30°F (-35°C)
Maximum is Setpoint High Limit
Factory Set
-20°F (-29°C)
Exceptions If OptiSet is active this feature is set
from the OptiSet Menu. The setting selected is used
for all ranges.
Description The Setpoint Low Limit allows the
lower setpoint limit to be set to a minimum of -30F
(-35°C) in one degree increments. The maximum
setting available is determined by the setting of
Setpoint High Limit. If the driver attempts to select a
setpoint lower than the Setpoint Low Limit, the
display will show Setpoint Limit, indicating that the
selected Setpoint Low Limit has been reached.
Setting the Setpoint High Limit and the Setpoint Low
Limit to the same temperature results in a single
setpoint temperature available.
Fuel Saver II
Micro Rev
All
HMI Rev
All
Choices
ENABLED or DISABLED
Factory Set
ENABLED
Exceptions If OptiSet is active this feature is set
from the OptiSet Menu.
Description If Fuel Saver II is ENABLED, and
the box temperature changes a predetermined
amount from setpoint in Cycle Sentry mode
operation, or if the box 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,
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
FS-II is DISABLED, high speed cool and high speed
heat are allowed with no delay.
The FS-II feature does not apply to modulation
operation.
3-14
31 January 2005
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