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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 *MVC960804CN** 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 *MVC960804CN**. 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
installation requirements and/or homeowner preference. Refer to the following figures for switch
positions 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.
T
IMINGS
42
Sw itch Bank S4
DIP Sw itch No.
Heating
Airflow
3
A
OFF
B*
ON
C
OFF
D
ON
(Indicates factory setting)
Sw itch Bank : S1
DIP Sw itch No.
Heat OFF Delay
1
90 s econds
OFF
120 seconds
ON
150 seconds*
OFF
180 seconds
ON
(*Indicates f actory setting)
Heat Off Delay Dip Switches
4
OFF
OFF
ON
ON
2
OFF
OFF
ON
ON
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Troubleshooting
