STARTUP FOR SYSTEMS CON-
FIGURED WITH COMMUNICA-
TIONS
INSTALLATION OF LINE VOLTAGE
AND GAS MUST BE PERFORMED
ACCORDING TO INSTRUCTIONS
WRITTEN IN THIS MANUAL. FAIL-
URE TO DO SO COULD RESULT
IN INJURY OR DEATH.
When the furnace is configured for
communications, the components on
the network (i.e. furnace, thermostat
and condenser) must establish com-
munications before engaging a heat
(or other) thermostat demand. The
procedure for establishing communi-
cations is automatic and is
described below. Once communica-
tions is established, the start-up pro-
cedure will be the same as the gen-
eral start-up instructions described
in the section of this manual titled
SSTTAARRTT--UUPP PPRROOCCEEDDUURREESS
.
Once the communicating wiring is
properly installed and the furnace is
connected to line voltage, the sys-
tem can be turned on. The thermo-
stat will display the following text:
“SEARCHING”
is displayed several times for sever-
al seconds. Next, the text
“FURNACE FOUND”
and
“AIR CONDITIONER FOUND”
or
“HEAT PUMP FOUND”
(depending on which is installed in
the system) will be displayed. The
process can take several minutes
(up to a maximum of 30) to com-
plete. If these messages are not
displayed within 30 minutes after
energizing the system, communica-
tions can not be established. There
are many reasons why communica-
tions may not be established –
including improper settings of the
“TERM” and “BIAS” switches (see
BIAS / TERMINATION) and improp-
er wiring (see WIRING A FURNACE
FOR COMMUNICATIONS above).
The order in which these messages
will be displayed will depend on
which components are energized
first. The order listed here assumes
that the furnace and condenser are
energized at the same time. If not,
the order of display will be in the
order that the components are
turned on.
!
WARNING
FIGURE 39
WIRING DIAGRAM – COMMUNICATING CONFIGURATION
ST-A-1114-01
50
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