65
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 fo
r o
ptimal operation.
The balance point is the point below
which gas heat will be used and above
which heat-pump heat will be used.
100 PRCNT TEST – (SW2-2 = OFF
and SW2-3 = ON) Represents the
mode of operation which will provide
100% heat rate for any heat call –
regardless of the rate transmitted by
the thermostat. This mode ends
automatically after the first 60 min-
utes of operation after power-up.
9. AC HP S
TG M
ULT
– 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.
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