Trane Symbio 700 - Compressor Protection - (HPC, DTL or aux Switch Proving Trip); Compressor X Proving Trip & Lockout; Two Cases Can Cause a Circuit X Proving Lockout Event; Compressor X Contactor Failure (Manual Reset)

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Compressor Protection – (HPC, DTL or Aux switch proving trip)
Compressor protection operates similar to Reliatel-based solutions, with some minor changes/additions.
In most cases, action is taken on a per-circuit basis, but often we have protection devices per
compressor.
Each compressor output will have a corresponding Compressor Proving input, which will be monitored
to determine the state of the compressor contactor (via Auxiliary switch). Depending on the state of the
contactor relative to the compressor output command, the following diagnostics will be generated:
Compressor “X” Proving Trip & Lockout
When a Compressor Output is Commanded ON, and it has been running for more than 5 seconds, if its
associated Proving input OPENs:
All compressor outputs on the circuit will shut down immediately.
The “Compressor X Proving Trip” diagnostic point will be annunciated.
The Compressor’s Proving Trip counter will be incremented.
The circuit will be disabled for 15 minutes.
After 15 minutes the circuit will attempt to restart
Two cases can cause a “Circuit X Proving Lockout” event:
If a circuit accumulates 4 “Compressor X Proving Trips” during the same compressor operating sequence
(cooling, heating, etc.), a “Compressor X Proving Lockout” will be generated.
At compressor startup, if its associated proving input does not CLOSE within 5 seconds, a “Compressor X
Proving Lockout” will be generated.
Once the “Lockout” has occurred the circuit will be locked out until a Diagnostic Reset is initiated
Compressor X Contactor Failure (Manual Reset)
If a Compressor Proving input becomes “Active” for 5 continuous seconds when the associated
Compressor Command output is Inactive, a “Compressor X Contactor Failure” diagnostic will be
generated; all compressors on the associated circuit will be de-energized immediately and they will be
locked out and the “Compressor X Contactor Failure” diagnostic point will be activated.
Once the Contactor Failure has occurred the circuit will be locked out until a Diagnostic Reset is initiated.