Issue:
Why is chiller tripping on low oil flow diagnostic compressor B (199)
Resolution:
RTAA 130-400 TON chillers. Not First Start Syndrome.
Items to check: Oil Line (King) Valve, Oil Filter, Differential Pressure Switch (DP Switch), DP Switch Schrader Oil Line Connection Point(s), DP Switch wiring, and lastly the Compressor Module Inputs.
- Verify the Oil Line King Valve is open and is working correctly.
- Verify the pressure drop across the oil filter to determine if the filter is plugged. Replace oil filter if necessary.
- Verify that the DP switch has not failed; or is chattering intermittently. Replace Oil DP switch.
- Verify the DP pressure lines/schrader fittings are making good mechanical connection. Verify that the schrader depressors are making a good mechanical connection on the schrader valve core.
- Verify the electrical wiring between the DP switch and the compressor modules is OK.
- Pull wires from compressor module at J3-1 and J3-2 and jumper across the module inputs
- If chiller still trips, replace module. This can be confirmed by swapping the compressor module with another compressor module on chiller to see if the problem follows the module.
- Per RTAA-SB-5 verify the Compressor Module is working correctly; if need be swap with other circuit(s) compressor module for testing.
Notes:
Refer to RTAA-SB-12 and/or Why is chiller tripping on low oil flow diagnostic compressor B (199) for more information.
Changes:
Piston has been rebuilt.
Installed swivel tees to show actual pressure drop and it only gets to 20 psid.
Disconnected wires from oil DP switch and wired them together, chiller still trips.
Other Question/Problem/Cause Statements:
- Why is chiller tripping on low oil flow diagnostic compressor B (199)
- What can cause low Oil Flow?
- What can cause low Oil Flow...diagnostic 198?
- What can cause low Oil Flow...diagnostic 199?
- What can cause low Oil Flow...diagnostic 19A?
- What can cause low Oil Flow...diagnostic 19b?
- What causes low Oil Flow...Compressor A?
- What causes low Oil Flow...Compressor B?
- What causes low Oil Flow...Compressor C?
- What causes low Oil Flow...Compressor D?
Facts:
- Air-Cooled Chiller (Pueblo) (RTAA 130-400 Ton)
Document Identifier: DOC-83037
Document Identifier: 83037
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.