Trane Technologies IntelliPak Signature SCWF Installation, Operation And Maintenance Manual page 100

Diagnostics
Category Diagnostic
Controls
The default HI-set SA temp heating setpoint becomes the active SA temp heating setpoint.
Reaction
Reset (PAR) An automatic reset occurs after the SA temp heating setpoint input returns to within range for 10 continuous seconds, or after a different
Required SA temp heating setpoint selection source is user-defined.
Supply Air Temperature Failure
The supply air temperature sensor input is out of range.
Problem
Sensor resistance should be between 830 ohms (200°F) and 345.7 ohms (-40°F). If so, check field/unit wiring between sensor and RTM.
Check
Reason for
The unit is reading a signal that is out of range for the supply air temperature input on the RTM (temp. < -55°F or temp > 209°F).
Diagnostic
These unit functions are disabled:
• Supply air tempering
Controls
• Economizing
Reaction
• Supply air temperature low limit function (CV units)
• Supply air temperature control heating and cooling functions (VAV units)
Reset (PAR) an automatic reset occurs after the designated S/A temperature input returns to its allowable range. To prevent rapid cycling of the
Required diagnostic, there is a 10 second delay before the automatic reset.
Supply Fan Failure
There is no supply airflow indication after the supply fan is requested on.
Problem
Check belts, linkages, etc. on the supply fan assembly. If these are ok, check field/unit wiring between RTM and supply fan. If the supply fan
Check
runs in service mode, then verify airflow proving switch and wiring.
• The supply airflow input is detected OPEN for 40 continuous seconds during any period of time in which the supply fan binary output is
Reason for
ON. between 830 ohms (200°F) and 345.7 ohms (-40°F). If so, check field/unit wiring between the sensor and MCM.
Diagnostic
• This input is ignored for up to 5 minutes after the supply fan starts, until airflow is first detected.
"Off" or "Close" requests are issued as appropriate to the following functions;
• Compressor staging/chilled water control
• Heat operation
• Supply fan control and proof of operation
Controls
Reaction
• Exhaust fan control and proof of operation
• Exhaust actuator control
• Economizer actuator control
• VFD control
Reset
(PMR) A manual reset is required anytime after the diagnostic is set. The diagnostic can be reset at the HI, Tracer Summit, or by cycling power
Required
to the RTM.
Supply Fan VFD Bypass Enabled
Data used
(module,
RTM
packet, byte,
bit)
Activation
Supply fan VFD bypass has been activated and supply fan vfd bypass is installed.
conditions
Time to React 10 sec < T < 20 sec
Diagnostic
text
(human
"SUPPLY FAN VFD BYPASS ENABLED"
interface
display)
Actions to be
NONE
Initiated
100 SCXF-SVX01T-EN