Lennox A98USMV Installation Instructions Manual page 66

Program Unit Capacity / Size Mode
Power-Up - Number displayed by integrated control represents unit size code (furnace
model and capacity). If three horizontal bars are displayed followed by continuous E203,
furnace control does not recognize unit size code. Configure per the following:
To enter Field Test
mode: Push and
hold button next
to 7-segment LED
display until solid
dash symbol appears. Release button.
If alarm is present, furnace
control will display
code. If alarm is not present,
solid dash starts blinking on
7-segment LED display.
To enter Program
Unit Capacity/
Size mode: Push
and hold button
next to 7-segment LED display until solid
P
" " symbol appears. Release button.
IMPORTANT: Field replacement controls
may need to be manually configured to
validate furnace unit size code.
P
Solid starts blinking on
7-segment LED.
Push and hold button. Integrated control
will display unit size code number for
each furnace model for three seconds.
Page 66 of 74
Yes
error
P
P
Furnace control
in IDLE mode (No
heating, cooling, or
indoor fan operation)
UNIT SIZE
CODE
1
2
3
4
5
6
When the correct unit size code is displayed, release
button. Selected code will flash for 10-second period.
During that period, press and hold button for 5 seconds.
Integrated control will store code in memory and will
automatically exit Field Test mode and reset. (If second
period expires or button is held less than 5 seconds,
control will automatically exit Field Test mode and go
into Idle mode without storing unit size code. If this
happens, programming function must be repeated.)
Verify that the selected unit size code is correct and
stored in non-volatile memory by cycling the 24 volt
power to the furnace control. (At 24 volt power-up of
the furnace control, the 7-segment LED will display a
unit size code. If three horizontal bars display, the board
does not recognize the unit size code. The programming
function must be repeated.)
Issue 2346
Turn room thermostat to OFF.
No
FURNACE MODEL
A98USMV070B12S
A98USMV090C12S
A98USMV090C16S
A98USMV090C20S
A98USMV110C20S
A98USMV135D20S
FINISHED
508364-01