13
Figure 6. Comfort Alert
TM
Diagnostics Module
POWER LED
(Green)
TRIP LED
(Red)
ALERT LED
(Yellow)
Diagnostics
Key
Wire the humidistat through the low-voltage wire entrance in
the packaged unit to the screw terminals marked
R
&
DEHUM
.
Wire the humidistat to open on rise in humidity.
When the HI/LO Dehumidify
Green
LED status light is ON, it
signals Low Humidity and keeps 24V supplied to the motor
for normal airflow requirements. If the humidity level of the
conditioned space increases the humidistat will open. Loss of
the 24V signal to the indoor blower motor allows the motor to
reduce to approximately 75% of normal airflow selected until
the humidity level drops. The
Green
LED is OFF during high
Check all factory wiring to the units wiring diagram. Inspect the
factory wiring connections to be sure none loosened during
shipping or installation.
Optional Comfort Alert
TM
Diagnostics Module
The Comfort Alert
TM
Diagnostics Module is a breakthrough
innovation for troubleshooting heat pump and air conditioning
system failures. The module installs easily in the electrical box
of the outdoor unit near the compressor contactor. By monitoring
and analyzing data from the Copeland scroll compressor and
the thermostat demand, the module can accurately detect the
cause of electrical and system related failures without any
sensors. A flashing LED indicator communicates the ALERT
code and a diagnostic key is also imprinted on the side of the
module to quickly direct the technician to the root cause of a
problem. See
NOTE:
This module does not provide safety protection! The
Comfort Alert
TM
Diagnostics Module is a monitoring device and
cannot control or shut down other devices.
24 VAC Power Wiring
The Comfort Alert
TM
module requires a constant nominal 24
VAC power supply. The module should be powered by an
R
&
C
that doesn’t have the potential for loss of power due to
safety controls, defrost boards, or other control boards which
could lead to nuisance alerts.
Thermostat Demand Wiring
The Comfort Alert module requires a two stage thermostat to
operate properly. The
Y2
thermostat wire entering the outdoor
unit should be connected to the
Y2
input on the unit terminal strip.
While the compressor is running, Comfort Alert will provide
power to the second stage cooling solenoid inside the
compressor after
Y2
has been energized for 5 seconds. When
the compressor is not running, Comfort Alert will not power the
solenoid, regardless of the state of
Y2
. If Alert codes 1 or 9
appear while the compressor is running, Comfort Alert will turn
off the solenoid to prevent solenoid damage from overheating
conditions.
L Terminal Wiring
White-Rodgers Compatible Thermostats
- The
L
connection
is used to communicate Comfort Alert codes to compatible
White-Rodgers thermostats. The
L
terminal of these thermostats
should be connected directly to the Comfort Alert
L
terminal.
See
, or the units rating plate for correct
field wiring connections.
NOTE:
On some White-Rodgers combatible thermostats, an
icon on the thermostat display will flash at the same rate as
the Comfort Alert yellow Alert LED. An advanced option on
these thermostats is to lock out the compressor when certain
Alert codes are detected in indicating impending compressor
damage. Refer to White-Rodgers thermostat manuals for more
information.
DC SOL Connection
The two pin
DC SOL
connector provides a connection to the
Copeland UltraTech second stage compressor solenoid See
. This 24VDC solenoid is internal to the
compressor and will not operate properly if 24VAC is applied
to the compressor solenoid terminals.
To reduce the VA load of the solenoid on the system, Comfort
Alert uses a phase control method to reduce the DC voltage to
the solenoid to the minimum level required to keep the solenoid
pulled in. As the 24VAC supply voltage varies, Comfort Alert
intelligently changes the solenoid DC voltage supply to minimize
power consumption. A voltmeter attached to the
DC SOL
output
will measure 4 - 18VDC, when solenoid should be energized,
depending on the level of the 24 VAC supply.
Interpreting the Diagnostic LED’s
When an abnormal system condition occurs, the Comfort
AlertTM module displays the appropriate ALERT and/or TRIP
LED. The yellow ALERT LED will flash a number of times
consecutively, pause and then repeat. To identify a Flash Code
number, count the number of consecutive flashes. See
for flash code identification or
for module wiring troubleshooting.
Each time the module powers up, the last ALERT Flash Code
that occurred prior to shut down is displayed for one minute.
The module will continue to display the LED until the condition
returns to normal or if 24 VAC power is removed from the module.
LED Description
• POWER LED (Green): indicates voltage is present at the
power connection of the module.
• ALERT LED (Yellow): communicates an abnormal
system condition through a unique flash code.
NOTE:
The ALERT LED will flash consecutively, pause and
then repeat the process. The number of consecutive flashes,
referred to as the Flash Code, correlates to a particular
abnormal condition. Detailed descriptions of these ALERT
Flash Codes are listed in
.
• TRIP LED (Red): indicates a demand signal is received
from the thermostat, but current to the compressor is not
detected by the module. The TRIP LED typically indicates
if the compressor protector is open or the compressor has
no power.
