COMMUNICATING SYSTEMS
The modulating furnace is capable
of communicating with a thermostat
and condenser to improve cooling
and heat-pump airflow, displaying
active faults and active furnace
information at the thermostat and
improved diagnostics and trou-
bleshooting.
WIRING A FURNACE FOR COM-
MUNICATIONS.
Maximum wire lengths and notes
about wiring communicating sys-
tems are noted below.
MAXIMUM COMMUNICATING
WIRE LENGTHS (1, 2, R & C)
Max Wire Length – Thermostat to
Furnace = 100 FT @ 18 AWG*
Max Wire Length – Furnace to
Condenser = 125 FT @ 18 AWG*
Notes:
1. When using twisted pairs, be
sure the wires connected to pins
labeled “1” (recommended wire
color = green) and “2” (recom-
mended wire color = yellow) are
a twisted pair.
2. Wires may be solid or stranded..
3. *Wire gage smaller than 18 AWG
is not approved or recommended
for this application.
4. When using existing wire from a
previous installation, be sure to
trim the tip of the wire back past
the insulation and strip a small
amount of insulation from the
wire to expose clean new copper
for the communicating connec-
tions. Fresh copper must be
exposed when making the com-
municating connections or com-
munications may not be properly
established.
Figure 39 is the wiring diagram for
connecting the furnace to an
approved ClimateTalk communicat-
ing thermostat and approved Rheem
or Ruud communicating condenser.
The only approved configuration is
to install dedicated wires directly
from the furnace to the thermostat
and a separate set of dedicated
wires directly from the furnace to the
condenser. Note: The only
approved configuration requires that
four dedicated wires (1, 2, R and C)
be installed from the furnace to the
condenser.
TABLE 16
LIST OF FAULT CODES AND NORMAL OPERATION CODES
NOTE: To clear current fault codes in the furnace control buffer, turn dipswitch SW3-3 on, off, on, off,
or off, on, off, on within 30 seconds. The right-most seven-segment display will energize the upper
and lower horizontal members for four seconds as confirmation that the faults have been cleared. Be
sure to return the dispswitch (SW3-3) to its original position after clearing the faults. The fault buffer
can also be cleared at the user menu under “FAULT HIST” in the sub-menu titled “CLEAR FAULT
HISTORY”.
Either procedure will clear the fault codes in the buffer displayed at the dual seven-segment displays
on the I.F.C. AND
at the Fault History user menu on communicating thermostats.
NOTE: The following fault codes will not be stored back-to-back in the fault buffer. These will only be
stored in the buffer if the previous fault stored was a different fault. 82, 11, 45, 46 & 57.
49
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