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Low-Pressure Switch--(Select M odels) A low-
pressure switchis factory-installed andlocated
in the suctionline interna! t o the outdoorunit.
Theswitch isdesigned t oprotect thecompressor
froma lossofcharge. U ndernormal c onditions,
theswitchisclosed. I f thesuction pressure falls
below5 psig,thentheswitchwill openandde-
energize theoutdoorunit.Theswitchwillclose
again once thesuction pressure i ncreases a bove
20 psig.Pleasenotethatthe switchinterrupts
thethermostat inputstothe unit. T huswhenthe
switchopensandthencloses, t herewillbea 5
minuteshortcyclingdelaybeforethe outdoor
unitwillenergize.
High-Pressure S witch--AHigh-pressure switch
isfactory-installed andlocated inthecompressor
discharge line internal t o theoutdoorunit.The
switchis designed to de-energize the system
when veryhigh pressures o ccurduring abnormal
conditions. Undernormal c onditions, theswitch
is closed. I f thedischarge pressure risesabove
575psig,thentheswitch willopenandde-ener-
gizetheoutdoor u nit.The switchwillcloseagain
oncethedischarge pressure decreases to460
psig.Please notethatthe switchinterrupts the
thermostat i nputsto the unit.Thus,whenthe
switchopensandthencloses, t herewillbea 5
minuteshortcyclingdelaybeforethe outdoor
unitwillenergize.
Comfort
Alert
TM
Diagnostics
(Select Models)
--
The Comfort
Alert
TM
diagnostics
module
facilitates
troubleshooting
heat pump and air
conditioning
system
failures.
This
Comfort
Alert
TM
module is designed only for single-phase
systems
with scroll
compressors
that have
internal overload protection. By monitoring
and
analyzing
data from the compressor
and the
thermostat
demand, the module can detect the
cause of electrical
and system related failures
without any sensors. A flashing LED indicator
communicates
the ALERT code and guides the
service technician
more quickly and accurately
to the root cause of a problem.
NOTE: This module
does not provide safety
protection!
The Comfort
Alert
TM
module
is a
monitoring
device and cannot control or shut
down other devices.
LED Description
(See Figure 2)
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. The ALERT LED will flash a number
of times consecutively,
pause and then repeat
the
process.
The
number
of consecutive
flashes, defined as the Flash Code, correlates
to a particular
abnormal
condition.
Detailed
descriptions
of specific ALERT Flash Codes are
shown in Table 1 of this manual.
TRIP LED (Red): indicates there is a demand
signal from the thermostat
but no current to the
compressor is detected bythe module.TheTRIP
LED typically indicates the compressor protector
is open or may indicate missing supply power
to the compressor.
The scroll compressor's
run (R), common
(C)
and start (S) wires are routed through the holes
in the Comfort Alert
TM
module marked "R," "C"
and "S."
24 VAC Power Wiring
-- The Comfort Alert
TM
module
requires
a constant
nominal
24 VAC
power supply. The wiring to the module's R and
C terminals must be directly from the indoor unit
or thermostat.
The Comfort Alert
TM
module requires a thermostat
demand signal to operate properly.
NOTE: After the thermostat
demand
signal is
connected,
verify that 24 VAC across Y and C
when demand is present.
TROUBLESHOOTING
interpreting
The Diagnostic
LEDs - When
an abnormal
system
condition
occurs,
the
Comfort Alert
TM
module displays the appropriate
ALERT and/or TRiP LED will flash a number of
times consecutively,
pause and then repeat the
process.To identify a Flash Code number, count
the number of consecutive
flashes.
Every 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.
Cooling
--
Gradually
lower the thermostat
temperature
setpoint
below the actual
room
temperature
and observe that the outdoor unit
and indoor blower energize. Feel the air being
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