AHRI (-)98VA060M317USA, Installation Instructions Manual

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PUSHBUTTON
15. PUSHBUTTON (S8)
Activation of IFC Status Menu
The status mode is entered when the pushbutton is
pressed for less than 2 seconds. While in the Status menu
at the seven segment displays, the CATEGORy FIELD is
displayed first for one second immediately followed by the
appropriate value for one second. This cycle repeats until
60 seconds has expired or the pushbutton has been
pushed again for less than two seconds. If the button is
pressed again for less than 2 seconds within the 60 sec-
ond period, the next CATEGORy FIELD will be displayed
and the 60 second timer will be reset. After displaying all
of the categories listed, the control will loop back to the
first category when the button is pressed again for less
than 2 seconds.
While in the CATEGORy FIELD , if the pushbutton is
pressed for more than 2 seconds but less than 5 seconds,
the display will exit the CATEGORy FIELD upon release
of the pushbutton. Otherwise, the status menu will auto-
matically exit if no activity is sensed on the pushbutton for
60 seconds.
The categories will be displayed in the following sequence:
Category Information
FL Up to six faults
(Example: = 22-46-30=)
AF IBM CFM
(Example: 1251 = 12-51, 745 = 7-45)
Fr Fire rate
UI Furnace size (in thousands of Btu)
tr Temperature Rise in Degrees F
(example 55)*
*If the Supply Air Temperature Sensor is not available, the
category will not be displayed.
Fault history display (FL)
Up to 6 faults are stored in the buffer with the most recent
replacing the oldest fault.
Unless otherwise specified, when a fault becomes active it
is to be stored in non-volatile memory provided no more
than three occurrences of any given fault code are already
stored in the fault buffer. If a fault occurs and there are al-
ready 3 occurrences of the same fault in the buffer, the
current fault will replace the oldest of the same fault in the
buffer but will become the most recent fault displayed.
Before updating the fault history the history will be exam-
ined for the previous most recent record. If the most re-
cent record in the history is the same fault number but has
a lower fault level than the new fault, then instead of
adding the new fault to the buffer, the previous fault and
level are replaced with the new fault and level. The time
stamp will also be updated. This way, the existing fault will
be updated but a new fault will not be added.
Note: In case of active dual faults – e.g. typical for pres-
sure switch faults, where fault
"57"
and
"45"
can be active
and become promoted at the same time – the mechanism
from the previous paragraph can be omitted. IFC can add
new records into the fault history instead of replacing the
existing records if the active dual faults get promoted to
the higher fault level.
Faults older than 168 powered hours will be automatically
deleted from the fault buffer.
When fault recall is activated, the six most recent faults
which have occurred within 1 week (168 powered hours)
will be displayed on the seven segment display in succes-
sion from the most recent to the oldest.
When displaying fault codes stored in the buffer, the con-
trol will flash the A and D segments of the right SSD for
1/2 second to indicate the beginning of the fault recall.
Each fault shall be displayed steady for one second fol-
lowed by energizing the top segment (A or D depending
on the position of the Display Orientation Dipswitch) of the
least significant (right most) Seven-segment display for
1/2 second followed by the next fault displayed for one
second. This cycle repeats until all faults in the buffer are
displayed. After all of the faults are displayed, the control
will again energize the A and D segment of the least sig-
nificant S.S.D. for 1/2 second.
INTEGRATED FURNACE CONTROL
DUAL SEVEN SEGMENT DISPLAy
switch make (close) RPM is greater than the high
pressure switch make (close) RPM or, if the low pres-
sure switch break (open) RPM is greater than the high
pressure switch break (open) RPM, the high and low
pressure switches are assumed to be mis-wired such
that the high pressure switch is connected to the
wiring for the low pressure switch and vice-versa. In
this case the fault code “ 45” (Low Pressure Switch
Open, Inducer on High Speed) and “ 55” is to be dis-
played alternately as described above (A-D).
The fault and mode codes and fault priorities are listed
below. Priority is to be used to determine which fault to dis-
play when two or more faults are present simultaneously.
NOTE: Verify display orientation is correct before inter-
preting fault codes. Otherwise, the fault codes may be up-
side-down. If a code is not on this list, the display may be
upside-down.