Installation guide

AlertTM Diagnostics device provides around-the-clock
monitoring for common electrical problems, compressor
defects, and broad system faults.
If trouble is detected, an alert code is displayed with a
flashing LED indicator. Alert codes are listed in Figure 17.
The device is factory wired and requires no modification.
Low voltage lead wires are provided in the control box for
connection to thermostat wires (use wire nuts). The
Comfort Alert TM Diagnostics device must be powered to
properly stage compressor to high capacity. Energizing the
Y (Y1) terminal operates the compressor in low stage. Both
the Y (Y1) and Y2 terminals must be energized for
Figure 17 Comfort Alert TM Diagnostics
high?stage operation. The Comfort Alert TM Diagnostics
device device operates by monitoring the compressor
power leads and the thermostat demand signals Y (Y1) and
Y2 terminals. It draws constant 24 VAC power at the R and
C terminals. When the compressor is operating in low stage
(Y or Y1), the 24v DC compressor solenoid coil is
de?energized. When the compressor is operating in high
stage 0( or Yland Y2), the 24v DC solenoid coil is
energized. The 24v
DC plug that is connected to the compressor does NOT
have an internal rectifier. DO NOT INSTALL A PLUG WITH
INTERNAL RECTIFIER.
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COMBUSTION/INDOOR FAN CONTROL
All functions of the combustion and indoor blower are
controlled by the ignition control board and interface board.
On a call for gas heat:
The ignition control energizes the combustion blower on
high speed. Once the combustion air proving switch closes,
the ignition sequence begins. The ignition control will sense
when the main (low stage) operator of gas valve has been
energized thereby firing the burners and starting the "delay
on" timing sequence of the indoor blower. The unit will then
run in low stage gas heat or until the thermostat is satisfied,
whichever is shorter. If the thermostat is not satisfied ater 10
minutes, the unit will go to second stage gas heat and run
until the thermostat is satisfied.
NOTE: Ifthe control senses that one of the safety limits has
opened, the combustion and indoor fans will operate until
the limit resets.
On a call for cooling:
The fan interface control board starts the indoor blower on
full speed immediately or after a 30 second delay
(field-selectable). Once the thermostat is satisfied, the fan
control will operate the blower for 0 or 90 additional seconds
(field-selectable).
Defrost Mode
On a call for defrost:
When the defrost sensor closes in the heating mode, there
is a 30, 60, 90 or 120 minute delay before the defrost mode
begins. This delay is selected by the position of the
dipswitches on the defrost board. Defrost interval timing
can be configured by selection switch 1 and 2 on the
dipswitch per the following table.
Switch 1 Switch 2 Time
ON OFF 30 Minutes
OFF ON 60 Minutes
OFF OFF 90 Minutes
ON ON 120 Minutes
NOTES:
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