Electric Heat - Lennox 16B27 Manuallines

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lectric eAt
IMPORTANT — When connected to an iComfort thermostat, all jumper settings can be made during con guration of the system in the thermostat.
After all electric heat installations, the Auto Detect function in the control will detect how much electric heat is available. That information will be sent to the Smart Hub,
along with all the other air handler parameters.
NOTE — Electric heat can still be configured manually using the push button, if Auto Detect
NOTE — Make sure power to control board is off before setting any jumpers. Once all jumpers are set, restore power to control board.
RECOMMENDED — USE FIGURE 24 AS A REFERENCE FOR SETTING
JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
Set desired Heating Mode Blower Speed jumper
pin.
Electric heat is staged by room thermostat. (AHC
comes with factory jumper between W1 to W2 and W2
to W3)
Refer to Air Handler Control Checkout ow diagram for
operation.
To enter electric heat mode
con guration , push and hold button
next to single character LED display
until dash symbol (solid bar)
appears, then release button.
Solid dash
starts
blinking on
single
character
LED
display
1. AHC will start the indoor blower motor to the selected heat jumper speed setting and cycle the electric heat relays ON to automatically detect number of electric
heat sections. (Electric heat section may be wired to energize more than one element)
2. AHC waits for maximum of ten seconds to detect electric heat 22 volt DC relay coils are energizing:
A If relay coil current is detected within ten seconds, AHC will show a 1 on the single character LED display indicating that the rst stage has been detected. As
each additional heat section is detected, single character LED display on the AHC will display that electric element number. (Example: Last number displayed
by the single character LED display is 3, the AHC is con gured to operate three electric heat sections.)
B If relay coil current is not detected within ten seconds, the AHC will exit the current active mode and resume operation with electric heat disabled.
3. AHC will automatically exit current con guration mode when con guration is completed. To verify that the number of electric sections detected matches the
installed electric heat package, the eld MUST CONFIRM that the last number the single character LED display before exiting the Con guring/Detection Mode
matches the number of installed electric heat sections. AHC stores the number of electric heat stages in non-volatile memory.
4. After the detection is nished, unit will continue to operate for an additional 30 seconds.
NOTE — If AHC push button is pushed or power is cycled on AHC is unable to verify all 22 volt DC electric heat relay(s) were energized using electric heater
detection, configuration will be stopped. Configuration function must be repeated.
Con guring/Detecting Electric Heat Sections
Standard
AHC in Idle Mode
(No heating cooling or
Yes
indoor fan operation)
Push and hold button until the solid H symbol is displayed on the single
character LED display, then release button.
Figure 8. Heat Mode Selection
is unavailable.
Which Heat
EVENHEAT
Mode?
Set desired Heating Mode Blower Speed jumper
pin.
Install and wire discharge air temperature sensor.
Con guration
Set desired Target Discharge Temperature jumper
pin. If jumper pin is missing or discharge air
temperature sensor is not detected, AHC defaults to
Standard Heat Mode . Target settings are 85, 100, 115
and 130ºF) .
Refer to EVENHEAT Operation ow diagram for
operation.
No
Turn room thermostat to OFF .
Finished
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