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2. Configuring Unit Size Codes
To enter Field Test
Mode; Push and
hold button next to
7−segment
display until dash
symbol
appears,
release button.
Solid
starts
on
LED display.
Push and hold button until the solid P
symbol is displayed on the 7−segment
LED, then release button. This mode
allows the user to select a unit size code
(number or letter) that matches the air
handler model size and capacity.
IMPORTANT: Field replacement controls may need to be
manually configured to validate air handler unit size code.
Solid
blinking
7−Segment LED
Push and hold button to allow AHC to display
unit size code (letter or number) for each
different air handler model for three seconds.
CBX40UHV
Power−up − Unit Size Code (number or letter) displayed represents unit size code (air handler
model size and capacity). If three horizontal bars display, Air Handler Control (AHC) does not
recognize unit size code (air handler model size and capacity).
Yes
_
LED
dash
_
blinking
7−segment
P
starts
P
on
Figure 34. Configuring Unit Size Codes
AHC in IDLE mode
(No heating, cooling or indoor fan
operation)
P
When the correct unit sized code is displayed,
release button. Selected code will flash for 10
second period. During that period, hold push button
until code stops blinking. AHC will store code in
memory and will automatically exit Field Test Mode
and reset. (If then second period expires or push
button is held less than three seconds, control will
automatically exit Field Test Mode and go into
IDLE mode without storing unit size code. If this
happens, configuring 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 AHC. (At 24 volt
power−up of the AHC, the 7−segment LED will
display a unit size code. If three horizontal bars
display, board does not recognize unit size
code.
repeated)
Page 39
− −
−
No
Turn room thermostat to OFF
UNIT SIZE
AIR HANDLER
CODE
MODEL
0
CBX32MV−018/024
1
CBX32MV−024/030
2
CBX32MV−036
3
CBX32MV−048
4
CBX32MV−060
5
CBX32MV−068
6
CBX40UHV−024
7
CBX40UHV−030
8
CBX40UHV−036
9
CBX40UHV−042
L
CBX40UHV−048
U
CBX40UHV−060
Programming
function
must
− −
−
be
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