SYSTEM OPERATION
12
3 Ton Models 1400 CFM
4 Ton Models 1760 CFM
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.
Tonnage
Selection
Airflow Tonnage
Selection
Airflow Tonnage
Selection
Airflow Tonnage
Selection
Airflow
1
400
2.3
920
3.6
1440
4.9
1960
1.1
440
2.4
960
3.7
1480
5
2000
1.2
480
2.5
1000
3.8
1520
5.1
2040
1.3
520
2.6
1040
3.9
1560
5.2
2080
1.4
560
2.7
1080
4
1600
5.3
2120
1.5
600
2.8
1120
4.1
1640
5.4
2160
1.6
640
2.9
1160
4.2
1680
5.5
2200
1.7
680
3
1200
4.3
1720
5.6
2240
1.8
720
3.1
1240
4.4
1760
5.7
2280
1.9
760
3.2
1280
4.5
1800
5.8
2320
2
800
3.3
1320
4.6
1840
5.9
2360
2.1
840
3.4
1360
4.7
1880
6
2400
2.2
880
3.5
1400
4.8
1920
Cooling Airflow Ramping Profiles
The multi-circulator blower also offers several custom
ON/ OFF ramping profiles. These profiles may be used to
enhance cooling performance and increase comfort level.
The ramping profiles are selected using the Cooling Airflow
Profile menu (if push buttons are used, use the CAP menu
to select the desired profile). Refer to the bullet points below
for a description of each ramping profile.
OFF
100% CFM
Cooling Demand
100% CFM
1 min
OFF
•
provides only an OFF delay of one (1) minute at 100% of the cooling demand
Profile A(1)
Cooling Demand
50% CFM
1/2 min
100% CFM
100% CFM
1 min
OFF
OFF
•
ramps up to full cooling demand airflow by first stepping up to 50% of the full
demand for 30 seconds. The motor then ramps to 100% of the required airflow. A one (1)
minute OFF delay at 100% of the cooling airflow is provided.
Profile B(2)
1 min
100% CFM
85
% CFM
7 1/2 min
Cooling Demand
100% CFM
OFF
OFF
•
ramps up to 85% of the full cooling demand airflow and operates there for
approximately 7 1/2 minutes. The motor then steps up to the full demand airflow. Profile C
also has a one (1) minute 100% OFF delay.
Profile C(3)
85
% CFM
7 1/2 min
100% CFM
50% CFM
1/2 min
50% CFM
Cooling Demand
1/2 min
OFF
OFF
•
ramps up to 50% of the demand for 1/2 minute, then ramps to 85% of the full
cooling demand airflow and operates there for approximately 7 1/2 minutes. The motor
then steps up to the full demand airflow. Profile D has a 1/2 minute at 50% airflow OFF delay.
Profile D(4 or 5)
In general lower heating speeds will: reduce electrical consumption,
lower operating sound levels of the blower, and increase the outlet
air temperature delivered to the home if heatmode is running.
If cooling mode is running the same airflow adjustment will
decrease the outlet air temperature delivered to the home.
The speeds available allow the blower performance to be
optimized for the particular homeowner’s needs.
Low Voltage Wiring - General Information
The Furnace functions with any thermostat that can be
configured to provide 24VAC on Y for cooling calls and 24VAC
on W for Heating calls. Based on these simple inputs, internal
algorithms will decide how to control two stages of furnace
heat in addition to any single or multi stage outdoor heating /
cooling operation (the algorithms will handle dual fuel multi-
stage systems as well). The thermostat must be setup to
provide only a Y call when cooling is required and only a W
call when heating is required. This is generally accomplished
by selecting single stage heat / single stage cool mode during
setup (if setup is required). Do not set thermostat to heat
pump operation as system will not operate properly.
Note: The only exception is if a single stage non-communicating
Heat Pump is connected to the furnace. Refer to Non-
Communicating Single Stage Heat Pump diagram for details.
Thermostat connections to the control board are R, C, G,
W, Y & Dehum. Provided the thermostat does not require a
common wire as few as two thermostat wires may be used
for heat only (R and W) or cool only (R and Y) systems. A
minimum three thermostat wires may be used for heating
and cooling systems (R, W and Y). Refer to thermostat wiring
diagrams below for your system configuration.
Low voltage connections can be made through either the right
or left side panel of the furnace. Thermostat wiring entrance
holes are located in the blower compartment.
