Configuring Unit; Air Handler Control Checkout - Lennox CBX32MV-018/024 Manual

Configuring Unit

This section identifies the requirements for configuring the air handler unit for unit size, heat mode selection and EvenHeat.
Power-up - Unit Size Code (Number or letter) displayed represents air handler model size and
capacity. If three horizontal bars displays, Air Handler Control does not recognize unit size code (air
handler model size and capacity).
No
Finished
After all electric heat installations, Control must be
manually configured to detect number of heat
sections. Refer to Configuring/Detecting electric heat
sections flow diagram, Air Handler or ECB40 Electric
Heat installation
No
Refer to Heat Pump or Cooling
Sequence of Operation flow
diagrams, Air Handler or ECB40
Electric Heat installation
instructions.
NUMBER OF HEAT SECTIONS DETECTED
T-STAT CALL TWO (H1-H2)
ONE (H1)
W1
H1
W2
W3
A call for electric heating first, second or third stage is
initiated when 24 VAC (R) is detected on W1, W2 and
W3 inputs on Control. (Factory mounted metal jumpers
connect W1/2 and W2/W3.)
Indoor blower will immediately start to delivery CFM
as set by heating mode jumper on AHC with
activation of first electric heat pilot relay.
RECOMMEND — USE FIGURE 19 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
CBX32MV

Air Handler Control Checkout

Electric
heat
Yes
Installed?
Yes
Standard
W1 Call?
Yes
THREE (H1-H3) FOUR (H1-H4)
H1 H1 H1 AND H2
H2 H2 H3
H2 H3 H4
Figure 20. Air Handler Control Checkout
Control
No (Display Alarm
recognizes
Unit Size Code 203)
Code?
Refer to Configuring Unit Size Codes flow diagram, Air Handler or
ECB40 Electric Heat installation instructions.
IMPORTANT — Field replacement controls may need to be manually
configured to validate air handler unit size code.
Which Heat
EVENHEAT
Mode?
Refer to EVENHEAT Operation flow diagram, Air Handler or
ECB40 Electric Heat installation instructions.
FIVE (H1-H5) Pilot relays on AHC are energized one at a time.
There is a minimum of 10 seconds delay between
H1 AND H2
pilot relay activations.
NOTE - Control will not recognize higher heat
H3 AND H4
sections calls if lower heat section is not present.
H5
At the completion of each heat section demand (W1,
W2, and W3), the AHC will immediately de-energize
the corresponding pilot relay(s).
NOTE — If the call for lower heat section is removed,
Control will automatically de-energize higher heat
sections.
At the completion of all heating demands, the indoor
blower will run for an additional 10 seconds before
de-energizing.
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