Configuring Unit; Checkout - Lennox 16B27 Manuallines

Configuring Unit

This section identifies the requirements for configuring the air handler in non-communicating mode for unit size, heat mode
selection and EvenHeat. For communicating configuration see the iComfort
c
heckout
Air Handler
Control Checkout
Power-up- Unit Size Code (Number or letter) displayed
represents unit size code (air handler model size and capacity).
If three horizontal bars displays, air handler control (AHC) does
not recognize unit size code (air handler model size and
capacity).
No
Finished
After all electric heat installations, AHC 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
diagrams, Air Handler or ECB40
Electric Heat installation
instructions.
T-STAT CALL 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 AHC. (Factory mounted metal jumpers
connect W1 to W2 and W2 to W3.)
Indoor blower will immediately start to delivery CFM as
set by heating mode jumper on board with activation of
first electric heat pilot relay.
Electric
heat
Yes
Installed?
Yes
Standard
W1 Call?
flow
Yes
NUMBER OF HEAT SECTIONS DETECTED
TWO (H1-H2) THREE FOUR (H1-H4)
(H1-H3)
H1 H1 AND H2
H1
H2
H2
H2
H3
PUSH
BUTTON
AHC
recognizes
Unit Size
No (Display
Code?
Alarm Code 302)
Which Heat
EVENHEAT
Mode?
Refer to EVENHEAT operation flow diagram, air handler or
ECB40 Electric Heat installation instructions.
FIVE (H1-H5)
H1 AND H2
H3 H3 AND H4
H4 H5
Figure 6. Checkout
Page 19
installation instruction.
®
AIR HANDLER CONTROL (AHC)
Refer to Configuring Unit Size Codes flow
diagram, Air Handler or ECB40 Electric Heat
installation instructions.
IMPORTANT: Field replacement controls
MUST be manually configured to validate
air handler unit size code.
22 VDC pilot relays on board are energized one at a
time. There is a minimum of 10 seconds delay between
pilot relay activations.
NOTE - AHC will not recognize higher heat section
demand if lower heat demand is not present.
At the completion of each heat section demand (W1,
W2, and W3), the control board will immediately
de-energize the corresponding pilot relay(s).
NOTE - If the call for lower heat section is removed,
AHC 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.
SINGLE
CHARACTER
DISPLAY