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RT-SVP07B-EN
125
DIAGNOSTICS Menu
Entering Evaporator
Temperature Sensor
Failure (Ckt-1 or Ckt-2)
Used With: DX cooling.
Module: MCM
Problem: The Entering
Evap Temp Sensor input for
the given circuit is out of
range. (Temperature <-55
F or Temperature > 209 F)
Check: The HI value and
wiring between the MCM
and specific sensor.
Removing the plug from the
MCM there should be no
shorts, opens and sensor
resistance should be
between 830 ohms and
345.7Kohms.
The Low Charge Protection
function (either Ckt-1 or
Ckt-2) is disabled on units
with that function and all
compressors on the given
circuit will be locked out
and prevented from
operating.
(PAR) An automatic reset
occurs after the entering
Evaporator Temperature
Sensor input returns to
within range continuously
for 10 seconds.
Evaporator
Temperature Sensor
Failure (Ckt-1 and
Ckt-2)
Used With: DX cooling.
Module: MCM
Problem: The Evap Temp
Sensor input for the given
circuit is out of range.
(Temperature <-55 F or
Temperature > 209 F)
Check: The HI value and
wiring between the MCM
and specific sensor.
Removing the plug from the
MCM there should be no
shorts, opens and sensor
resistance should be
between 830 ohms and
345.7Kohms.
The Coil Frost Protection
function for the given
refrigeration is disabled.
The Low Charge Protection
function (either Ckt-1 or
Ckt-2) is disabled on units
with that function and all
compressors on the given
circuit will be locked out
and prevented from
operating.
(PAR) An automatic reset
occurs after the evaporator
temperature input returns
to its allowable range for 10
seconds.
Exhaust Fan Failure
Used With: Power Exhaust
w/ or w/o Statitrac option,
and when Return Fan is not
installed.
Module: RTM
Problem: The unit has
power exhaust and the
exhaust proving switch
input has been detected
OPEN for 40 continuous
seconds during any period
of time in which the
Exhaust Fan binary output
is ON.
Check: Check belts,
linkages, etc. on the
exhaust fan assembly. If
these are ok, check field/
unit wiring between RTM
and exhaust fan. If exhaust
fan will run in service mode,
then verify airflow proving
switch and wiring.
A “minimum position”
request is issued to the
Economizer Actuator
Control function. And a
“Fan off” request is issued
to the Exhaust Fan Control
function.
Note: On units with an
exhaust fan installed, an
ECEM Comm Fail diagnostic
will also generate this
diagnostic to insure the
defined reaction is
observed.
(PMR) A manual reset is
required anytime after the
Diagnostic is set. The
Diagnostic can be reset by
the Human Interface or
Tracer, or by cycling power
to the RTM.
Table 11: Diagnostics Troubleshooting Chart (continued)