507746-01
Issue 1821
Page 31 of 39
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.
Configuration
Standard
Air handler control
in
Idle Mode
(No heating cooling or
indoor fan 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.
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 air handler controls must be configured to detect electric heat sections.
Electric heat is staged by room thermostat. (air handler
control includes factory-installed jumper between W1
and W2 and jumper between W2 and W3)
Refer to Air Handler Control Checkout flow diagram for
operation.
1.
The air handler control 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.
The air handler control 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, air handler control 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. (If last number
displayed by the single character LED display is 2, the air handler control is configured to operate two electric heat sections.)
B
If relay coil current is not detected within ten seconds, the air handler control will exit the current active mode and resume operation with electric heat disabled.
3.
The air handler control 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 befor
tion Mode matches the number of installed electric heat sections. The air handler control 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.
H
NOTE — If air handler control push button is pushed or power is cycled on and air handler control 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.
NOTE - USE FIGURE 19 AS A REFERENCE FOR SETTING JUMPER
CONFIGURATIONS ON THE AIR HANDLER CONTROL.
-
-
Figure 22.
Heat Mode Selection
