17
Star Bushing
Bolt
Nut
Ambient Sensor
Plastic Clip
Nut
Figure 8. Ambient Sensor Mounting
Figure 7. Ambient Sensor Location
Figure 9. Comfort Alert
TM
Diagnostics Module
POWER LED
(Green)
TRIP LED
(Red)
ALERT LED
(Yellow)
Diagnostics
Key
Table 5. Demand Defrost Curve Profiles
Jumper
Position
Minimum Time
Between Defrosts
(min)
Terminate
Temperature
(° F)
Compressor
Delay Function
1
20
40
NO
2
20
40
YES
3
20
75
NO
4
20
75
YES
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 Figure 9.
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 cannot be powered by
the
C
terminal on a defrost board or other control board
without experiencing nuisance alerts.
NOTE:
The wiring
to the module’s
R
&
C
terminals must be routed directly
from the indoor unit or thermostat.
If the constant 24 VAC (
R
wire) is not present in the outdoor
unit, use one of the spare wires in the thermostat cable to
bring power to the module. Connect the other end of the
spare wire to
R
at the indoor unit or thermostat.
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
The
L
connection is used to communicate Alert codes to
compatible White-Rodgers thermostats. The
L
terminal
of the thermostat should be connected directly to the
Comfort Alert
L
terminal.
On some White-Rodgers 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.
If using a White-Rodgers compatible thermostat, DO
NOT connect the
L
terminal from the thermostat to
L
on
the terminal block in the unit, if it is already connected
to the Comfort Alert Module. Standard thermostats with
an
L
terminal which are not compatible with the Comfort
Alert Module, can only be connected to
L
on the terminal
block in the unit.
