507404-02Page 44 of 80 Issue 1448
Non-Communicating
In non-communication applications this furnace is designed
to operate in a SINGLE-STAGE mode or TWO-STAGE mode
using a convention thermostat.
For optimal performance in non-communicating applications,
use a high quality electronic digital thermostat or any other
with adjustable settings for 1st stage / 2nd stage ON/OFF
differentials and adjustable stage timers.
Communicating
In communicating applications the Comfort Sync™
thermostat must be used. Refer to the instructions provided
with the thermostat for installation, set-up and operation. In
communicating systems all unused thermostat wire in the
wire bundle needs to be terminated inside and out. The
extra wires can terminate on the “C” terminal of the Comfort
Sync™ communication terminal strip. Using an additional
wire come off “C” terminal and wire nut all the extra wires
together. Termination on the outdoor control must match
the indoor control.
Indoor Blower Speeds
Non-Communicating
When the thermostat is set to “FAN ON”, the indoor blower
will run continuously at approximately 38% of the second
stage cooling speed when there is no cooling or heating
demand.
When the furnace is running in the heating mode, the indoor
blower will run on the heating speed designated by the
positions of DIP switches 11, 12 and 13.
When there is a cooling demand, the indoor blower will run
on the cooling speed designated by the positions of DIP
switches 5 and 6. First stage cooling will run at 70% cool
speed.
Communicating
NOTE: When this furnace is used with a Comfort Sync™
thermostat, proper indoor blower speed selections are made
by the communicating thermostat.
When the thermostat is set to “FAN ON”, the indoor blower
will run at setting determined during system conguration.
When there is a heating demand the fan will run on heating
speeds for ring rate.
When there is a cooling demand, the fan will run on the rst
stage and second stage cooling speed set using the Comfort
Sync™ thermostat in the installer setup mode. The factory
default is based upon 400 CFM per ton.
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