SYSTEM OPERATION
11
during the next cycle. If
the heat pump can satisfy the thermostat in less
than the System Target Runtime the temporary
heat pump hold will be completely removed and
the heat pump will become the primary heat
source again. if it fails to do so, the strike count
against the furnace will be reset and the furnace
will remain the temporary primary heat source
until the Under Target Threshold is reached again.
The system will automatically make adjustments in an attempt
to satisfy the thermostat as close to this target runtime as
possible. After a power cycle or mode change (cooling to
heating or heating to cooling) the system will run full capacity
for the selected mode during the rst thermostat call. Based
on the selected target runtime and how long the initial cycle
takes to satisfy the thermostat, the control algorithm will adjust
the system stage times for a 2 stage unit or the capacity
demand percentage for an inverter / modulating unit for the
next cycle. Note: actual runtimes may change depending on
variations of load throughout the day.
The following table shows the default values for all
Comfort Setting Options (1 – 5)
Over Target
Threshhold
(Strike Count)
Under Target
Threshhold
(Strike Count)
1 10 20 20 2 10
2 15 20 20 4 8
3 20 20 20 6 6
4 25 20 20 8 4
5 30 20 20 10 2
The following table shows the ranges for each of item
when the adjustable Comfort Setting Option 6 is selected.
The table shows the minimum value, the maximum value
and the defaulted value. All items can be adjusted up or
down by increments of 1 which provides full exibility
for all items. Note: it is critical that these numbers be
set properly. If Comfort Setting option 3 is desired but
a target time of 60 is preferred, select Comfort Setting
Option 6 to enable all the adjustable menus, set the Target
Time to 60 and make sure the other menus are set to
match that of Comfort Setting Option 3.
Menu Minimum Value Maximum Value Default Value
Target Time (t9t) 1 minute 240 minutes 60 minutes
Stage Up Percent (SUP) 0% 100% 20%
Stage Down Percent (SdP) 0% 100% 20%
Over Target Threshold (Ott) 1 strike 254 strikes 20 strikes
Under Target Threshold (Utt) 1 strike 254 strike s 20 strikes
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