Symbio 700 Compressor Circuit(s) Troubleshooting for Precedent and Odyssey
Summary:
This compressor circuit troubleshooting is for the Precedent and Odyssey with Symbio 700 unit controller. The following images illustrate the route the circuit follows for the auxiliary, and safety components to the contactor to ensure that the compressor circuit is properly connected and closed.
Precedent:
Circuit 1 Run Command Path
- Compressor 1 run command from UC P8-5 to Adapter Board J20-5.
- Then to Adapter Board J13-1 by board trace.
- Out to the HPC1 and back to Adapter Board J13-2.
- Then to Adapter Board J13-3 by board trace.
- Out to DTL1 and back to the Adapter Board J13-4.
- Then to Adapter Board J5-9 by board trace, then out to CC1 coil.
Notes:
- Between the adapter board and the CC1 coil, there are two plugs: PPF81/PPM81 and PPF/PPM23
- Between the adapter board and the CC1(AUX1) there is one plug: PPF81/PPM81
Circuit 1 Proving Circuit Path
- The Proving Circuit is UC P8-2 to J20-2.
- To Adapter Board J5-5 by board trace.
- Through the Aux switch to J5-6.
- To Adapter Board J20-3 by board trace.
- Then to UC P8-3
Circuit 2 Run Command Path
- Compressor 2 run command from UC P9-5 to Adapter Board J20-11.
- Then to Adapter Board J11-1 by board trace.
- Out to the HPC2 and back to Adapter Board J11-2.
- Then to Adapter Board J11-3 by board trace.
- Out to DTL2 and back to the Adapter Board J11-4.
- Then to Adapter Board J5-11 by board trace, then out to CC2 coil.
Notes:
- Between the adapter board and the CC2 coil, there are two plugs: PPF81/PPM81 and PPF/PPM24
- Between the adapter board and the CC2(AUX1) there is one plug: PPF81/PPM81
Circuit 2 Proving Circuit Path
- The Proving Circuit is UC P9-2 to J20-8.
- To Adapter Board J5-7 by board trace.
- Through the Aux switch to J5-8.
- To Adapter Board J20-9 by board trace.
- Then to UC P9-3
Odyssey:
Circuit 1
- Compressor 1 run command from UC P8-5 to Adapter Board J20-5.
- Then to Adapter Board J13-1 by board trace.
- Out to the HPC and back to Adapter Board J13-2.
- Then to Adapter Board J13-3 by board trace.
- Out to DTL and back to the Adapter Board J13-4.
- Then to Adapter Board J7-1 by board trace, then out to CC1 coil.
- The Proving Circuit is J5-1 to J22-1 through the Aux switch, to J22-2 to J20-3, then to UC P8-3.
Circuit 2
- Compressor 2 run command from UC P9-5 to Adapter Board J20-11.
- Then to Adapter Board J11-1 by board trace.
- Out to the HPC and back to Adapter Board J11-2.
- Then to Adapter Board J11-3 by board trace.
- Out to DTL and back to the Adapter Board J14-4.
- Then to Adapter Board J7-3 by board trace, then out to CC2 coil.
- The Proving Circuit is J5-1 to J22-3 through the Aux switch, to J22 -4, to J20-9, then to UC P9-3.
Compressor Proving Alarms
Possible Alarms:
Alarm - Compressor Proving Trip Diagnostic – 15-minute lockout
- The HPC or DTL opens while the compressor is running, (after the circuit has proved) and the Compressor Contactor loses its 24 VAC, causing the Aux Switch to open
Alarm - Compressor Proving Lockout Diagnostic – INSTANT UNIT LOCKOUT!
- The Symbio Board calls for the Compressor Contactor, and the Contactor doesn’t pull in within 7 seconds.
Possible causes:
The HPC and or the DTL are open.
Contactor Coil open.
Wiring error.
Alarm - Compressor Proving Lockout Diagnostic – INSTANT UNIT LOCKOUT!
- The Symbio Board calls for the Compressor Contactor, it pulls in and drops back out after 7 seconds.
Possible causes:
No 24 VAC at black wire on the Aux Switch
Bad Aux Switch.
Aux Switch is not on the contactor correctly.
Alarm - Compressor Contactor Fail Diagnostic – INSTANT UNIT LOCKOUT!
- The Compressor Contactor Aux Switch closes before it is supposed to
Possible causes:
The technician pushes in the contactor manually.
The contactor welded shut.
Note:
A good way to find out if the pressure switches or the board/wiring is the issue is to unwire the line voltage from the compressor in question and isolate it.
Have the Symbio 700 Board turn on the circuit.
If the circuit operates normally with the compressor line voltage unwired then you may have a refrigeration issue, if you still get a proving diagnostic, then you may have a board/wiring/issue.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.