Model Data Card; Dual 7-Segment Display - Rheem *96V series Installation Instructions Manual

MODEL DATA CARD & DUAL SEVEN-SEGMENT DISPLAY
13. MODEL DATA CARD CONNECTOR (P6)
There is a factory-installed model data card which is
wire-tied to the furnace. At no time should this card be
removed from the furnace except during replacement
of the control.

MODEL DATA CARD

A model data card is defined as an electronic card that
carries a copy of the furnace model data.
DO NOT REPLACE THE FURNACE CONTROL OR
MEMORY CARD OF THE FURNACE WITH A FUR-
NACE CONTROL OR MEMORY CARD OF AN-
OTHER 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 NEC-
ESSARILY LIMITED TO) REDUCED AIRFLOW
DURING HEATING CAUSING EXCESSIVE UNDE-
SIRED 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 INFORMA-
TION SHOULD NOT BE TRANSPORTED FROM ONE
FURNACE (OR COMPONENT) TO ANOTHER.
The furnace control receives model-specific data from
the model data card.
Replacement memory 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
memory card is lost, the original furnace control has been
replaced and there is no furnace model data, the replace-
ment memory 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 cor-
rect furnace model data. When no furnace model data is
present either at the memory or on the furnace micro-
processor a "d1" (NO MODEL DATA) fault code will be dis-
played at both the thermostat active fault screen and at
the furnace control (I.F.C.) seven-segment displays.
If the original memory card is lost, it should be replaced
even if there is valid furnace model data on the IFC micro-
processor. The valid furnace model data on the IFC mi-
croprocessor should only be considered as a backup to
the memory card.
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14. DUAL SEVEN-SEGMENT DISPLAY AND FAULT
CODES (U38)
NOTE: Verify display orientation is correct before in-
terpreting fault codes. Otherwise the fault codes may
be upside down.
A dual seven segment display shall be provided to dis-
play 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 severe enough that it prevents furnace
or other critical (e.g. cooling) operation. Level 1 faults
generally permit operation to continue but operation
may not be at optimum performance (e.g. blower op-
erating 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 indi-
cations of current modes of operation which are con-
sidered normal (some operational codes are displayed
simultaneously with low level faults which do not inter-
rupt operation - see paragraphs below for details).
Since usually only one fault can be displayed at the
seven-segment display at any given time (see excep-
tions 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. Lower numbers are considered higher
priority than larger numbers. Therefore, fault code pri-
ority 0 has the highest priority and shall be displayed
when present regardless of any other fault that might
also be present at the same time. This mechanism
does not prevent simultaneous faults from being
logged into the fault code buffer.
The mode displays for heat mode ("h" "H") shall reflect
the demand from the thermostat. This includes when
only a first stage heat call; "W1" is present ("W2" not
present), the mode displayed should reflect the first
stage demand by displaying the lower-case "h" and
not the actual output of the furnace during ignition
(since this configuration ignites at high stage).
Three exceptions to this rule exist as follows:
1. When the thermostat demand is for high stage and
only low heat can be provided because the high
pressure switch will not close or has opened and
will not re-close. In this case, the mode "h" (low
heat) shall be displayed alternately along with the
fault "57" (open high pressure switch) (See item 5
below in this section).
2. When autostaging has been activated and a re-
sponse to "W1" heat has been increased to high
heat by the furnace control after the user-specified
time even though a call for high heat ("W2") is not
present. In this case a capital "H" shall be dis-
played and not a lower-case "h".