55.. AACC--HHPP AADDJJ
– Adjusts the cooling
or heat-pump airflow slightly to
change or adjust the temperature
rise slightly. See the section of this
manual titled “DIPSWITCH” under
“SW1” (SW1-5 and SW1-6) for
details and selections.
66.. OONN DDEEMMAANNDD DDEEHHUUMM
– Toggles
the dehumidification feature on or
off. See the section of this manual
titled “DIPSWITCH” under “SW2”
(SW2-1) for details and selections.
77.. AACC HHPP SSTTGG MMUULLTT
– This allows
for adjustment to the airflow for
low-stage of cooling and heat-pump
operation. See the section of this
manual titled “DIPSWITCH” under
“SW2” (SW2-4) for details and
selections.
DUAL-FUEL OPERATION IN COMMU-
NICATING MODE
Systems configured for dual-fuel opera-
tion will include a communicating con-
denser with a reversing valve. Dual-
fuel systems will display “
HP
” for Heat-
Pump heat operation at the furnace
control’s (I.F.C.) dual seven-segment
displays. During defrost mode, “
dF
” will
be displayed. All other codes apply.
The balance point can be adjusted at
the thermostat for optimal operation.
The balance point is the point below
which gas heat will be used and above
which heat-pump heat will be used.
dipswitch selections without the need of
translating the settings manually.
Note: The “DIPSWITCH” menus will not
be displayed at the thermostat. They
are invisible to the thermostat and can
not be displayed. These menus can
only be viewed with the field service
tool. The reason is that dipswitch selec-
tions do not generally affect operation of
the furnace when using the communi-
cating mode of operation.
NOTE: The integrated furnace control
does not recognize switch setting
changes while energized. To change
settings, remove power to the board by
turning off the disconnect or switch to
the furnace control or removing power
at the breaker, make changes, then
return power.
11.. CCOOOOLL AAIIRRFFLLOOWW
– Displays the
value of the cooling airflow selected.
See the section of this manual titled
“DIPSWITCH” under “SW1” (SW1-1
and SW1-2) for details and selec-
tions.
22.. TTIIMMEEDD SSTTAAGGIINNGG FFEEAATTUURREE
–
OFF – 2 Stage Operation
ON – Timed Staging W/1 Stage
Thermostat
33.. HHEEAATT AADDJJ
– Displays the value
selected at SW3, positions 1 and 2.
It is the adjustment of the high heat
rate airflow. See the section of this
manual titled “DIPSWITCH” under
“SW3” for details and selections.
44.. FFAANN SSPPDD SSEELLEECCTT
– Displays the
fan speed selected. See the section
of this manual titled “DIPSWITCH”
under “SW1” (SW1-4) for details
and selections.
For dual-fuel systems, to protect
equipment, the supply air sensor
must be installed. When the supply
air sensor is properly installed and
the system is in defrost mode, the
gas heat will only operate when the
outlet air is below 110°F. When the
outlet air exceeds 110°F, the gas
valve is turned off and the Air
Circulating Blower (ACB) continues
to run. When the supply air tempera-
ture reaches 95°F, the gas heat will
again be turned on. This cycle will
continue until the call for defrost has
ended.
NOTE:
FOR DUAL-FUEL OPERA-
TION, THE SUPPLY AIR SENSOR
MUST BE INSTALLED AND THE
SELECTION FOR THIS SENSOR
SET TO “ON” IN THE “SETUP”
USER MENU UNDER THE SELEC-
TION “SUPPLY AIR SENS” FOR
DUAL-FUEL OPERATION. FAIL-
URE TO INSTALL THE SENSOR
AND TO TURN IT ON IN THE
USER MENUS COULD CAUSE
EXCESSIVE TRIPPING OF THE
PRESSURE LIMIT CONTROLS ON
THE AC SYSTEM.
56
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