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7. Select the heating speed for your model from the heating speed chart in the Specification Sheet. The adjust setting (already
established by the cooling speed selection) determines which set of speeds are available. The selected speed must provide a
temperature rise within the rise range listed with the particular model.
Example:
If the *M96VC0804CN** is set for 1210 CFM on cooling, the "ADJUST" is set to "+" (plus). The four heating
speeds available are "A Plus", "B Plus", "C Plus", and "D Plus". "A Plus" has a
rise of 46°F for both stages which is within the 30-60°F rise range for the
*M96VC0804CN**. This setting will keep electrical consumption to a minimum.
Set the "Heat" speed DIP switches to "A".
8. Select the desired "heating" speed tap by positioning switches S4- 3,4 appropriately. Refer
to figure above. Verify CFM by noting the number displayed on the dual 7-segment LED
display.
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. The speeds
available allow the blower performance to be optimized for the particular homeowner's needs.
Continuous fan speeds that provide 25, 50, 75 and 100% of the furnace's maximum airflow capability are selectable via dip
switches S5- 3, 4.
Example:
If the furnace's maximum airflow capability is 2000 CFM and 25% continuous fan speed is selected, the
continuous fan speed will be 0.25 x 2000 CFM = 500 CFM.
B
H
O
D
LOWER
EAT
FF
ELAY
The integrated control module provides a selectable heat off delay function. The heat off delay
period may be set to 90, 120, 150, 180 seconds using the DIP switches or jumper provided on the
control module. The delay is factory shipped at 150 seconds but may be changed to suit the instal-
lation requirements and/or homeowner preference. Refer to the following figures for switch posi-
tions and corresponding delay times.
C
N
™ S
OMFORT
ET
YSTEM
O
VERVIEW
The ComfortNet system is a system that includes a ComfortNet compatible furnace and air conditioner or heat pump with a CTK0*
thermostat. A valid ComfortNet system could also be a compatible furnace, CTK0* thermostat and non-compatible, single stage air
conditioner. Any other system configurations are considered invalid ComfortNet systems and must be connected as a traditional (or
non-communicating) system (see Electrical Connections for wiring connections).
A ComfortNet heating/air conditioning system differs from a non-communicating/traditional system in the manner in which the
indoor unit, outdoor unit and thermostat interact with one another. In a traditional system, the thermostat sends commands to the
indoor and outdoor units via analog 24 VAC signals. It is a one-way communication path in that the indoor and outdoor units typically
do not return information to the thermostat.
In a ComfortNet system, the indoor unit, outdoor unit, and thermostat comprising a ComfortNet system "communicate" digitally
with one another, creating a two-way communications path. The thermostat still sends commands to the indoor and outdoor units.
However, the thermostat may also request and receive information from both the indoor and outdoor units. This information may
be displayed on the ComfortNet thermostat. The indoor and outdoor units also interact with one another. The outdoor unit may
send commands to or request information from the indoor unit. This two-way digital communications between the thermostat and
subsystems (indoor/outdoor unit) and between subsystems is the key to unlocking the benefits and features of the ComfortNet
system.
Two-way digital communications is accomplished using only two wires. The thermostat and subsystem controls are power with 24
VAC. Thus, a maximum of 4 wires between the equipment and thermostat is all that is required to operate the system.
A
C
IRFLOW
ONSIDERATIONS
Airflow demands are managed differently in a fully communicating system than they are in a non-communicating wired
system. The system operating mode (as determined by the thermostat) determines which unit calculates the system
airflow demand. If the indoor unit is responsible for determining the airflow demand, it calculates the demand and sends
it to the ECM motor. If the outdoor unit or thermostat is responsible for determining the demand, it calculates the demand
T
IMINGS
41
Sw itch Bank S4
DIP Sw itch No.
Heating
3
4
Airf low
A
OFF
OFF
B*
ON
OFF
C
OFF
ON
D
ON
ON
(Indicates f actory setting)
Sw itch Bank: S1
DIP Sw itch No.
Heat OFF Delay
1
2
90 seconds
OFF
OFF
120 seconds
ON
OFF
150 seconds*
OFF
ON
180 seconds
ON
ON
(*Indicates factory setting)
Heat Off Delay Dip Switches
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Troubleshooting
