AHRI (-)98VA060M317USA, Installation Instructions Manual, Page: 72 / 108

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WARNING
DO NOT REPLACE THE FURNACE CONTROL OR
MEMORy CARD OF THE FURNACE WITH A
FURNACE CONTROL OR MEMORy CARD OF
ANOTHER FURNACE OR ANOTHER COMPONENT
(E.G.: A MEMORy CARD FROM A CONDENSER OR
AIR HANDLER). THE WRONG FURNACE CONTROL
OR MEMORy CARD MAy SPECIFy PARAMETERS
WHICH WILL MAkE THE FURNACE RUN AT UNDE-
SIRED CONDITIONS INCLUDING (BUT NOT
NECESSARILy LIMITED TO) REDUCED AIRFLOW
DURING HEATING CAUSING ExCESSIVE
UNDESIRED OPERATION OF THE MAIN LIMIT
CONTROL. FURTHER, THE MEMORy CARD IS
SPECIFIC TO THE MODEL NUMBER AND BTU
INPUT RATING FOR A SPECIFIC FURNACE AND
THIS INFORMATION SHOULD NOT BE
TRANSPORTED FROM ONE FURNACE (OR
COMPONENT) TO ANOTHER.
INTEGRATED FURNACE CONTROL
SW16 (“2F/4F”) is mapped as follows:
SW16 OFF = 2 Deg F Temperature Rise Adjustment*
SW16 ON = 4 Deg F Temperature Rise Adjustment.
Additionally, the adjustment to the low-end will affect a lin-
ear adjustment to the entire range of heating airflow ex-
cept at the 100% rate. The adjustment to the range will be
such that the 40% heating rate will be adjusted up or
down as specified by the dipswitch settings, the 100%
heating rate may also be adjusted up or down and all
points in between will fall on a line created by the adjusted
40% heating airflow rate and the adjusted (or unadjusted)
100% heating airflow rate.
Further, for communicating systems, the above selections
(made with dipswitches SW13, SW14, SW15, and SW16
in legacy mode) can be made via the Econet control cen-
ter.
Heat Blower Off Delay; SW17
One dipswitch (SW17) is to be provided for heat blower off
delay selection.
SW17 = Off 90 second*
SW17 = On 120 second
Efficiency or Comfort Select; SW18
SW 18 will select between comfort heat (off –factory set-
ting) and efficiency heat (on).
SW18 = Off Comfort = Target Temp rise = +10°F
above mid Rise*
SW18 = On Efficiency = Target Temp rise = mid-rise
(as specified on rating label).
*Factory Setting
Bias/Termination; S4
For current installations, all three of the dipswitches
in bank S4 must be in the “OFF” position.
If not, the system may not be able to communicate.
13. MODEL DATA CARD CONNECTOR (P6)
There is a factory-installed model data card which is
plugged into the furnace control and wire-tied to the
furnace. At no time should this card be removed from the
furnace except during replacement of the card itself.
MODEL CARD
A model data card is defined as an electronic card that
carries a copy of the furnace model data.The furnace
control receives model-specific data from the model data
card. Replacement model data cards with the appropriate
furnace model data for any given model can be ordered
from the Replacement Parts division. In the event that the
original model data card is lost, the original furnace control
has been replaced and there is no furnace model data,
the replacement model data card must be ordered and
installed into the connector at P6 to give the furnace valid
furnace model data. The furnace will not operate properly
without the correct furnace model data. When no furnace
model data is present either on the model data card or on
the furnace microprocessor a "d1 " (NO MODEL DATA)
fault code will be displayed at both the thermostat active
fault screen and at the furnace control (I.F.C.) seven-
segment displays.
If the original model data card is lost, it should be replaced
even if there is valid furnace model data on the IFC
microprocessor. The valid furnace model data on the IFC
microprocessor should only be considered as a backup to
the model data card.
14. DUAL SEVEN-SEGMENT DISPLAy AND FAULT
CODES (U38)
NOTE: Verify display orientation is correct before
interpreting fault codes. Otherwise the fault codes maybe
upside down.
A dual seven-segment display is provided to display status
and diagnostic code information. A fault level 1 is a low-
level fault. In general, a level 2 fault is a fault that is se-
vere enough that it prevents furnace or other critical (e.g.
cooling) operation. Level 1 faults generally permit opera-
tion to continue but operation may not be at optimum per-
formance (e.g. blower operating at power maximum).
Standard operating codes (e.g. C for high-stage cooling)
are considered fault level “0” as they are not faults at all
but only indications of current modes of operation which
are considered normal (some operational codes are dis-
played simultaneously with low-level faults which do not
interrupt operation - see paragraphs below for details).
Since usually only one fault can be displayed at the
seven-segment display at any given time (see exceptions
below), the fault displayed when two or more faults are
present at the same time shall be resolved by the fault
code list below which calls out the fault code priority.
Smaller numbers are considered higher priority than larger