To Next Page

To Previous Page

Page 9

Heat Mode Selection -

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.

Which Heat

Mode?

Set desired Heating Mode Blower Speed jumper pin.

Electric heat is stages by room thermostat. (AHC

comes with factory jumper between W1/W2 and

W2/W3)

Refer to Air Handler Control Checkout flow diagram for

operation.

Configuration

Standard

EVENHEAT

AHC in Idle Mode

(No heating cooling or

indoor fan operation)

To enter electric heat configuration,

push and hold button next to single

character display until dash symbol

(solid bar) appears, then release

button.

Turn room thermostat to

OFF.

Ye s

Solid dash

starts

blinking on

single

character

display.

Push and hold button until the solid H symbol is displayed on the single character

display, then release button.

Finished

NOTE - All field replacement AHC will require

configuring/detecting electric heat sections.

Set desired Heating Mode Blower Speed jumper pin.

Install and wire discharge air temperature sensor.

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 flow diagram for

operation.

1AHC 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)

2AHC waits for maximum of ten seconds to detect electric heat 22 volt DC relay coils are energizing:

AIf relay coil current is detected within ten seconds,

AHC will show a “1” on the single character display indicating that the first stage has been detected. As

each additional heat section is detected, single character display on the AHC will display that electric element number. (Example: Last number displayed by

the single character display is 3, the AHC is configured to operate three electric heat sections.)

B If relay coil current is not detected within ten seconds,

the AHC will exit the test mode and resume operation with electric heat disabled.

3AHC will automatically exit configuration when 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 displayed 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.

4Verify that the indoor blower motor 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.

AIR HANDLER CONTROL (AHC)

SINGLE CHARACTER

DISPLAY

PUSH BUTTON

FIGURE 12. Heat Mode Selection