Ahc System Status Codes; Ahc Configuration, Test And Error Recall (Fault And Lockout) Function; Configuring Electric Heat Sections; Indoor Blower Test - Lennox CBX40UHV Series Installation And Service Procedure

UNIT STATUS AND ALARM CODES

AHC Single Character
Display
Letter or Number
- -
-
.
A
C
d
d F
H
h
U
Table 12. AHC Configuration, Test and Error Recall (Fault and Lockout) Function
NOTE — AHC MUST BE IN IDLE MODE)
Single Character
Action
LED Display
-
Solid Push and hold button until solid appears, release button. Display will blink.
-
Blinking
Push and hold button until required symbol displays

CONFIGURING ELECTRIC HEAT SECTIONS

Release push button - control will cycle the indoor blower motor on to the selected heat speed and stage the electric heat
K
relays on and off to automatically detect number of electric heat sections. Control will store the number of electric heat sec­
Solid
tions. Control will automatically exit current active mode.

INDOOR BLOWER TEST

Release push button - control cycles indoor blower on for ten seconds at 70% of maximum air for selected capacity size unit.
A
Solid
Control will automatically exit current active mode.
CONFIGURING UNIT SIZE CODES
Single Character LED
Display
RELEASE push button - This mode allows the field to select a unit size code (number or letter) that matches the air handler
model size and capacity.
p
Solid
IMPORTANT — All field replacement controls may be manually configured to confirm air handler model size and ca­
pacity.
3-When the correct Unit Sized Code is displayed, RELEASE push button. Selected code will flash for 10 second period.
3-During ten second period, HOLD push button until code stops blinking (three seconds minimum).
3-Air Handler Control will store code in memory and exit current active mode . LED display will go blank and then the Unit Size
p
Code will display for 2 to 5 seconds.
Blinking
NOTE - If ten second period expires, or push button is held less than 3 seconds, control will automatically exit current active
mode and go into IDLE Mode without storing unit size code. If this occurs, then Unit Size Code configuring procedure must
be repeated.
ERROR CODE RECALL MODE (NOTE — CONTROL MUST BE IN IDLE MODE)
To enter Error Code Recall Mode — PUSH and HOLD button until solid E appears, then RELEASE button.
e
Solid
Control will display up to ten error codes stored in memory. If E000 is displayed, there are no stored error codes.
To exit Error Code Recall Mode — PUSH and HOLD button until solid three horizontal bars appear, then RELEASE
- -
button.
Solid
-
NOTE - Error codes are not cleared
c To clear error codes stored in memory, continue to HOLD push button while the three horizontal bars are displayed. Release
Solid
push button when solid c is displayed. Display will blink.
c
Blinking Push button to confirm command to delete codes. Error codes are cleared.
CBX40UHV
Table 11. AHC System Status Codes
Action
Unit Size Code (number or letter) displayed represents air handler model size and capacity.
If three horizontal bars are displayed, AHC does not recognize air handler model size and capacity.
Idle mode (decimal point / no unit operation)
Delivered CFM. Example: A1200
Stage Cooling (Shows active cooling stages)
Dehumidification mode (Unit in dehumidification mode only)
Shown only while in active defrost (Y, W and O call)
Stage heating (Shows number of active electric heat pilot relays) H1 or H2 or H3
Stage heat pump (shows active heat pump stages)
Discharge air sensor temperature (indoor blower must be operating)
Action
C1 or C2
h1 or h2
H A P
. or
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