Rheem 96MDV Series, Installation Instructions Manual

Page: 95 / 128

95
INTEGRATED FURNACE CONTROL
PUSHBUTTON
15. PUSHBUTTON (S8)
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 fol-
lowed by the appropriate value for one second. This
cycle repeats until 60 seconds has expired or the
pushbutton as been pushed again for less than two
seconds. If the button is pressed again for less than 2
seconds within the 60 second period, the next 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.
If within the status menu, if the button is pressed for
more than 2 seconds but less than 5 seconds, the dis-
play will exit the status menu upon release of the
push-button. Otherwise, the status menu will automat-
ically exit if no activity is sensed on the pushbutton for
60 seconds.
The categories will be displayed in the following se-
quence:
Category Information
FL Up to six faults (Example: —21-14-29—)
AF IBM CFM
(Example: 1251 = 12-51, 745 = 7-45)
Fr Fire rate % (Example: 70)
UI Furnace size
tr Temperature Rise in Degrees F
(example 75)*
*If the Supply air temp sensor is not available the cat-
egory 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.
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 least most sig-
nificant SSD for ½ second to indicate the beginning of the
fault recall. Each fault shall be displayed steady for one
second followed by energizing the top segment (A or D
depending on the position of the Display Orientation Dip-
switch) of the least significant (right most) Seven-segment
display for ½ 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 significant S.S.D. for ½ second.
Airflow Display (AF)
Displayed CFM range is between 100 and 9999 per fol-
lowing sequence:
The sequence repeats until the status menu is exited or
the pushbutton is pressed again.
Fire Rate Display (Fr)
Gas heat fire rate is displayed for 1 second as follows:
“0” is displayed when flame is not lit.
“HI” is displayed when flame is lit and the fire rate is high.
“Lo” is displayed when flame is lit and the fire rate is low.
Model BTU Capacity/1000 (Unit Input) (UI)
The furnace input BTU will be taken from the model data
field
Furnace BTU’s/1000 . Values less than 100 will be
displayed as two digits (example 70 displayed as 70). Val-
ues of 100 or greater will be displayed as three digits. The
most significant digit will be displayed for one second on
the left SSD followed by the remaining two digits which
are also displayed for one second. Example: 117 would be
displayed as 1 followed by 17.
Temperature Rise (tr)
Temperature rise is to be displayed (Supply Temp – Re-
turn Temp). If the Supply air temp sensor is not available
the category will not be displayed.
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