Trane SCWM Series Installation, Operation And Maintenance Manual page 76

Diagnostics
Table 29. Compressor warning (continued)
Warning: Compressor 1 Frostat Limit Status (In Alarm)
Notification Class
Compressor speed will be
limited to keep the
HVAC Warning. compressor from causing
frost buildup on the
evaporator coil.
Warning: Compressor (2-4) High Discharge Press Warning (In Alarm)
Notification Class
No action is taken on the
fixed speed compressor, this
HVAC Warning.
is an informational warning
only.
Warning: Compressor (2-4) FrostatWarning (In Alarm)
Notification Class
No action is taken on the
fixed speed compressor, this
HVAC Warning.
is an informational warning
only.
Note: These warnings are generated to alert the end user to a potential condition.
Table 30. Supply fan alarms
Supply Fan (1-6) Failure (In Fault)
Notification Class
Fan will be locked out and
prevented from running
HVAC Critical Alarm.
until this diagnostic is
cleared.
Note: These failures are generated by each fan and will lock out that fan when active.
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Action Reason
The Saturated suction
refrigerant temperature is
calculated to be below 36
degrees.
Action Reason
Head Pressure has exceeded
the condenser Control
Pressure Setpoint.
Action Reason
The Saturated suction
refrigerant temperature is
calculated to be below 36
degrees.
Action Reason
The supply fan was
commanded on and a VFD
Fault was detected.
Typical Causes
• Low Airflow across the coil
• Malfunctioning TXV.
No Reset required, Warning
• Dirty Air Filters
clears when conditions no
• Dirty Evaporator Coil
longer exists.
Typical Causes
• High Condenser Water
Temperature
• Malfunctioning TXV.
No Reset required, Warning
• Non Condensable in the
clears when conditions no
refrigerant.
• Low water flow in the
longer exists.
condenser, or no water flow.
• Condenser Valve
malfunctioning.
Typical Causes
• Low Airflow across the coil
No Reset required, Warning
• Malfunctioning TXV.
clears when conditions no
• Dirty Air Filters
longer exists.
• Dirty Evaporator Coil
Typical Causes
• VFD Fan circuit Breaker is Manual Reset Required once
open.
the issue is resolved. User
• VFD Fan has over amped.
must toggle the Supply
• VFD Fan has lost a phase.
Failure Reset
Reset Required
Reset Required
Reset Required
Reset Required
PKG-SVX027A-EN