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1. Stage Up Percent (7 segment menu SUP): This is a
value that determines how far past the target runtime
the system should continue running the heat pump be-
fore transitioning to the furnace. For example, assume
this menu was set to 20% with a target runtime of 20
minutes. If the thermostat did not remove the heating
call after 20 minutes, the system would allow for an ad-
ditional 20% heat pump run (20% of the 20 minute tar-
get is an additional 4 minutes). In this case, the system
would turn on back up electric heat after 24 minutes
if the thermostat call was still present. Each time this
occurs, the system records this as a strike against the
heat pump (the strike is important when looking at the
Over Target Threshold)
2. Over Target Threshold (7 segment menu Ott): If the
heat pump has consecutively activated back up electric
heat for the selected Over Target Threshold amount of
times, meaning for this many consecutive cycles it has
been unable to satisfy the target time by itself, then
the heat pump will be temporarily locked out and the
furnace will become the primary heat source.
3. Stage Down Percent (7 segment menu SdP): This
only applies when the heat pump and back up electric
heat are activated on initial start-up. In this case, the
system will try to determine when the best time to op-
erate the heat pump individually again. To determine
this, the system looks at how easily the air handler is
able to satisfy the thermostat using the heat pump with
back up electric heat. Assume this setting is 15% and
the target time is 20 minutes. If the heat pump with
back up electric heat can satisfy the thermostat in less
than 17 minutes (20 minutes - 15% = 17 minutes) then
the algorithm records a strike against the air handler
(this strike is important when looking at the Under Tar-
get Threshold).
4. Under Target Threshold (7 segment menu Utt): If
the air handler is able to satisfy the thermostat using
the heat pump with back up electric heat for the se-
lected number of consecutive cycles the electric heat
operation will be temporarily removed. The heat pump
will then be used during the next cycle. If the heat pump
can satisfy the thermostat in less than the System Tar-
get Runtime the back up heat operation will be com-
pletely 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 first 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 run times
may change depending on variations of load throughout the
day.
The following table shows the default values for all Comfort
Setting Options (1 – 5)
Stage Up
Comfort
Target
Percentage
Setting
Time
Option
(Minutes)
(%)
1
10
20
2
15
20
3
20
20
4
25
20
5
30
20
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 flexibility 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
Target Time (t9t)
Stage Up Percent (SUP)
Stage Down Percent (SdP)
Over Target Threshold (Ott)
Under Target Threshold (Utt)
13 Electrical and Control Wiring
IMPORTANT: All routing of electrical wiring must be made
through provided electrical knockouts. Do not cut, puncture
or alter the cabinet for electrical wiring.
13.1
Building Electrical Service Inspection
This unit is designed for single-phase electrical supply
only. DO NOT OPERATE ON A THREE-PHASE
POWER SUPPLY. Measure the power supply to the
unit. The supply voltage must be measured and be in
agreement with the unit nameplate power requirements
and within the range shown.
Nominal Input
Minimum Voltage
208-240
13.2
Wire Sizing
Wire size is important to the operation of your
equipment. Use the following check list when selecting
the appropriate wire size for your unit.
12
Stage Down
Over Target
Percentage
Threshhold
(%)
(Strike Count)
20
2
20
4
20
6
20
8
20
10
Minimum Value Maximum Value Default Value
1 minute
240 minutes
0%
100%
0%
100%
1 strike
254 strikes
1 strike
254 strikes
Maximum Voltage
197
ELECTRICAL VOLTAGE
Table 10
Under Target
Threshhold
(Strike Count)
10
8
6
4
2
60 minutes
20%
20%
20 strikes
20 strikes
253
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