SYSTEM OPERATION
27
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)
Comfort
Setting
Option
Target
Time
(Minutes)
Stage Up
Percentage
(%)
Stage Down
Percentage
(%)
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 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
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 strikes
20 strikes
Circulator Blower Speed
The Airflow quantity is displayed as a number on the three
7 segment displays, rounded to the nearest 100 CFM.
The display alternates airflow amount and the system
operating status.
Each furnace has a “Maximum CFM” it is capable of
providing. All fan operations (Constant CFM, Cooling
Airflow Profiles, Low and High Stage gas heat airflow,
outdoor Air Conditioner / Heat Pump Airflow, etc.) are
based off of multipliers which are percentages of this
maximum CFM. Max CFM is as follows:
3 Ton Models 1400 CFM
4 Ton Models 1760 CFM (1650 CFM FOR 0803 MODELS)
5 Ton Models 2200 CFM
Setup Furnace Airflow: adjust the Gas Heating Airflow
menu (gAF) setting to the desired percentage of
maximum airflow. In most cases the default gas heat
airflow will provide a temperature rise near the middle of
the acceptable range. High Stage CFM can be calculated
by the following equation: CFM = Max CFM * Selected
Heating Airfow Percentage.
For Communicating Outdoor Units: Main airflow
adjustment is not required. The Outdoor unit will
determine the appropriate amount of indoor airflow to
request. Airflow Trims can be made if desired.
For Non-Communicating outdoor units, determine the
proper airflow (based off tonnage of) the outdoor unit.
Most cooling systems are designed to work with airflow
between 350 and 450 CFM per ton. 400 CFM/TON is
the industry standard. Once desired airflow has been
determined, see Tonnage / Airflow table to identify the
Tonnage Selection that is closest to the desired airflow.
This table is based on 400 CFM per ton where Airflow =
(400 CFM) x (Selected Tonnage).
Example: if 1520 CFM is the desired airflow the Tonnage
Selection that matches this is 3.8
Enter the Tonnage (ton) menu either by using the on
board push buttons or phone application and select the
Tonnage Selection you identified. Note: Trim is also
available if additional adjustment is required.
