Lennox CBX32MV Installation Instructions Manual page 30

Multi?position air handler

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RECOMMEND

USE FIGURE 21 AS A REFERENCE FOR SETTING

JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

Set desired Heating Mode Blower Speed jumper

pin.

Electric heat is stages by room thermostat. (AHC

comes with factory jumper between W1 to W2 and W2

to W3)

Refer to Air Handler Control Checkout flow diagram for

operation.

To enter electric heat mode

configuration, 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

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)

AHC waits for maximum of ten seconds to detect electric heat 22 volt DC relay coils are energizing:

If relay coil current is detected within ten seconds, AHC will show a 1 on the single character LED display indicating that the first 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 configured to operate three electric heat sections.)

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.

AHC will automatically exit current configuration mode when configuration is completed. To verify that the number of electric sections detected matches the

installed electric heat package, the field MUST CONFIRM that the last number the single character LED display before exiting the Configuring/Detection Mode

matches the number of installed electric heat sections. AHC stores the number of electric heat stages in non−volatile memory.

After the detection is finished, 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.

Configuring/Detecting Electric Heat Sections

IMPORTANT

All electric heat installations require the Air Handler Control (AHC) to be manually

configured to detect number of heat sections.

NOTE

All field replacement AHC will require configuring/detecting electric heat sections.

Standard