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Page 21

electric heAt

Conguring/Detecting Electric Heat Sections

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,

Which Heat

Mode?

Set desired Heating Mode Blower Speed jumper

pin.

Conguration

Standard EVENHEAT

AHC in Idle Mode

(No heating cooling or

indoor fan 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.

Turn room thermostat to OFF .

Ye s

Solid dash

starts

blinking on

single

character

LED

display

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

character LED display, then release button.

Finished

NOTE — Electric heat can still be configured manually using the push button, if Auto Detect

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.

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 ow diagram for

operation.

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:

AIf 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.

RECOMMENDED — USE FIGURE 24 AS A REFERENCE FOR SETTING

JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

along with all the other air handler parameters.

is unavailable.

NOTE — Make sure power to control board is off before setting any jumpers. Once all jumpers are set, restore power to control board.

Figure 8. Heat Mode Selection