Trane Symbio 700 - Defrost Fault

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ACC-APG001A-EN
Defrost Fault
The below list of diagnostics are associated with the Demand Defrost Function.
Fault Fault Detection Symbio 700 Response
Response
Type
Diagnostic: Demand
Defrost Disabled
• Set Diagnostic:
Demand Defrost
Disabled with any
Demand Defrost Fault
on non-independent
circuit heat pumps.-
• Set Diagnostic
Demand Defrost
Disable Ckt X with
any Demand Defrost
Fault on any circuit for
independent
condenser systems.
• Set Diagnostic: Demand Defrost
Disabled
• For Independent Circuit Heat Pump
units, set Diagnostic Demand
Defrost Disable Ckt X (depending
on the associated circuit)
• Revert to Default Defrost operation.
• See Demand Defrost Faults below
Manual
Reset
Diagnostic: Demand
Defrost Disabled Ckt 1
Diagnostic: Demand
Defrost Disabled Ckt 2
Diagnostic: Demand
Defrost Fault A
∆T is below minimum
value 12 minutes after
defrost is terminated.
• Initiate Defrost
• If Low ∆T > 2 hours:
– Set Diagnostic: Demand
Defrost Disabled
– Set Diagnostic: Default
Defrost Fault A
• For Independent Circuit Heat Pump
units, set Diagnostic: Demand
Defrost Disable Ckt X
• Set Diagnostic: Default Defrost
Fault A CKt X
• Initiate Defrost
Reset timer if ∆T returns within bounds
Manual
Reset
Diagnostic: Demand
Defrost Fault A Ckt 1
Diagnostic: Demand
Defrost Fault A Ckt 2
Diagnostic: Demand
Defrost Fault B
Defrost terminated on
time requirement
If defrost is terminated on time
requirement (vs differential temp)
• Set Diagnostic: Default Defrost
Fault B
• For Independent Circuit Heat Pump
units, set Diagnostic: Default
Defrost Fault B Ckt X
• Increment Demand Defrost Fault B
counter
After counter = 10
Set Diagnostic: Demand
Defrost Disabled
or for Indepentent Circuit unit
• For Independent Circuit Heat Pump
units, set Diagnostic: Demand
Defrost Disable Ckt X
Manual
Reset
Diagnostic: Demand
Defrost Fault B Ckt 1
Diagnostic: Demand
Defrost Fault B Ckt 2
Diagnostic: Demand
Defrost Fault C
∆T is above Maximum
Value 12 minutes after
defrost is terminated
• Set Diagnostic: Default Defrost
Fault C
or for Independent Circuit units, set
Diagnostic: Default Defrost Fault C
Ckt X
• Initiate Defrost Increment Demand
Defrost Fault C counter
• After counter = 16
• Set Diagnostic: Demand Defrost
Disabled
or for Independent Circuit units
• Set Diagnostic: Demand Defrost
Disable Ckt X
Manual
Reset
Diagnostic: Demand
Defrost Fault C Ckt 1
Diagnostic: Demand
Defrost Fault C Ckt 2
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