Page 45
CBX40UHV
3.
Configuring / Detecting Electric Heat Elements
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?
S
Set desired
Heating Mode Blower Speed
jumper
pin.
Configuration
Standard
EVENHEAT
AHC in
Idle Mode
(No heating cooling or
indoor fan operation)
To enter
electric heat configuration
mode
, push and hold button next to
single character LED display until
dash
symbol (solid bar) appears,
then release button.
Turn room thermostat to
OFF
.
Yes
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
No
NOTE — All field replacement AHC will require configuring/detecting electric heat sections.
S
Electric heat is stages by room thermostat. (AHC
comes with factory jumper between W1 to W2 and W2
to W3)
S
Refer to Air Handler Control Checkout flow diagram for
operation.
S
Set desired
Heating Mode Blower Speed
jumper
pin.
S
Install and wire discharge air temperature sensor.
S
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) .
S
Refer to
EVENHEAT Operation
flow 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:
A.
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.)
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 active 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.
4.
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.
RECOMMEND
— USE FIGURE 12 AS A REFERENCE FOR SETTING
JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
Figure 35. Configuring / Detecting Electric Heat Elements
