92
SCXF-SVX01T-EN
Additional Diagnostic Resources
Refer to the Self-Contained Programming Guide, PKG-
SVP01, for specific unit programming and troubleshooting
information. In particular, reference the “Service Mode
Menu” and “Diagnostic Menu” sections in the programming
guide. Refer to the following text for general diagnostic and
troubleshooting procedures.
Category Diagnostic
A
Auto Reset S/A Static Pressure Limit
Problem The supply air static pressure went too high. Reason for Diagnostic: The S/A static pressure exceeded the S/A static pressure limit setpoint for
at least one second continuously.
Controls
Reaction
A “supply air pressure shutdown” signal is sent to the following functions:
• Compressor staging control
• Economizer actuator control
• Heat operation
• Supply fan control,
• VFD control
• Exhaust fan control
• Exhaust actuator control
Reset
Required
(PAR)The supply fan is not allowed to restart for 15 seconds after the diagnostic occurs. An auto reset will also occur if the unit cycles out of
occupied mode and back.
C
CO2 Sensor Failure
Problem The VCM CO2 sensor input signal is out of range.
Check Check field/unit wiring between sensor and VCM.
Reason for
Diagnostic
The unit is reading a signal that is out of range for the CO2 sensor transducer input.
Controls
Reaction
The CO2 reset function disables.
Reset
Required
(PAR) An automatic reset occurs after the CO2 sensor transducer input receives a signal that is within range for ten continuous seconds.
Compressor Contactor Fail—Circuit 1, 2, 3, or 4
Problem
The compressor contactor for Ckt. 1, 2, 3, or 4 has malfunctioned.
Reason for
Diagnostic
The circuit compressor proving input is detected closed continuously for more than three seconds while neither compressor output on that
circuit closes.
Controls
Reaction
A “lockout ckt #1, 2, 3, or 4” request is issued to the compressor staging control function.
Reset
Required
(PMR) A manual reset is required after the diagnostic is set. It can be reset by the HI or Tracer Summit.
Compressor Trip—Ckt 1, 2, 3, or 4
Problem
The compressor ckt #1, 2, 3, or 4 has tripped.
Reason for
Diagnostic
• The ckt #1, 2, 3, or 4 compressor proving input is detected open continuously for more than 3 seconds when either or both compressor
outputs on that circuit energize (as described in the compressor protection function).
• The circuit compressor proving input is detected open continuously for more than 3 seconds when either or both compressor outputs on
that circuit energize (as described in the compressor protection function).
Controls
Reaction
A “lockout ckt #1, 2, 3, or 4” request is issued to the compressor staging control function.
Reset
Required
(PMR) A manual reset is required after this diagnostic occurs. The diagnostic can be reset by the unit mounted HI module or Tracer Summit.
Diagnostics
To Next Page
Loading...