Trane IntelliPak I - Page 130

130 RT-SVP04F-EN
System Testing & Troubleshooting
Evaporator Temperature
Sensor Failure - Circuit 1
Evaporator Temperature
Sensor Failure - Circuit 1
Problem: The Evaporator
Temperature Sensor (Circuit
#1) is out of range.
Check: Sensor resistance
should be between 830 ohms
(200 F) and 345.7Kohms (-40
F). If so, check field/unit
wiring between Sensor and
MCM/SCM.
The unit is reading a signal
that is out of range for the
circuit #1 Evaporator
Temperature sensor input
(Temp < -55 F or Temp > 209
F).
The Coil Frost Protection
function for refrigeration
circuit #1 only is disabled.
(PAR) An automatic reset
occurs after the #1 Evaporator
Temperature input returns to
its allowable range for 10
seconds.
Evaporator Temperature
Sensor Failure - Circuit 2
Problem: The Evaporator
Temperature Sensor (Circuit
#2) input is out of range.
Check: Sensor resistance
should be between 830 ohms
(200 F) and 345.7Kohms (-40
F). If so, check field/unit
wiring between Sensor and
MCM.
The unit is reading a signal
that is out of range for the
circuit #2 Evaporator
Temperature sensor. (Temp <
-55 F or Temp > 209 F).
The Coil Frost Protection
function for refrigeration
circuit #2 only is disabled.
(PAR) An automatic reset
occurs after the #2 Evaporator
Temperature input returns to
its allowable range for 10
seconds.
Exhaust Fan Failure
Problem: There is no exhaust
airflow indication after the
exhaust fan has been
requested 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.
The unit has power exhaust
and the Exhaust Proving input
is detected OPEN for 40
continuous seconds during any
period of time in which the
Exhaust Fan binary output is
ON.
Notes: If StatiTrac or an ECEM is
installed but not
communicating, Exhaust
Fan Failure will appear as
an active diagnostic at all
times.
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.
(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.
Final Filter Proving Failure
Problem: Final Filter switch is
closed.
Check: Status of Final Filters
"Final Filter switch is closed for
more than 60 seconds
continuously.
An Information Only
diagnostic is set.
(PAR) An automatic reset
occurs after the Final Filter
switch input reopens for 60
continuous seconds.
DIAGNOSTIC DISPLAYED REASON FOR DIAGNOSTIC UCM’S REACTION RESET REQUIRED