On the display
The control center shows CONDENSER - HIGH PRESSURE as a safety shutdown message. This wording is the only display form the manual gives for it. While the message is active the chiller is shut down, and it can only be started again once the pressure and clearing conditions described on this page are met.
What it means
The condenser pressure, as sensed by the Condenser Transducer, has increased to greater than 200 psig on shells with 235 psig DWP, or to greater than 295 psig on shells with 350 psig DWP. Because shells with 235 psig DWP and shells with 350 psig DWP trip at different pressures, the control determines the shell DWP by the condenser model number on the Sales Order Screen — which of the two thresholds applies to the machine depends on the condenser specified on the sales order.
Why it appears
- Condenser pressure rising above the trip threshold — greater than 200 psig on shells with 235 psig DWP, or greater than 295 psig on shells with 350 psig DWP — as sensed by the Condenser Transducer. This is the only cause the manual lists for the message.
What to check
- Confirm which shell rating the control is using: it determines the shell DWP by the condenser model number on the Sales Order Screen, and the trip and restart pressures differ between shells with 235 psig DWP and shells with 350 psig DWP.
- Watch the condenser pressure and wait until it has fallen below the restart threshold for that shell rating before attempting to clear the fault.
Setpoints and thresholds
- Safety trip: condenser pressure greater than 200 psig on shells with 235 psig DWP.
- Safety trip: condenser pressure greater than 295 psig on shells with 350 psig DWP.
- Restart permitted: condenser pressure less than 140 psig on shells with 235 psig DWP.
- Restart permitted: condenser pressure less than 235 psig on shells with 350 psig DWP.
- Shell DWP determination: by the condenser model number on the Sales Order Screen.
Reset and restart
The message does not clear by itself while the pressure is still high; the clear fault button must be pressed after the pressure has dropped. The chiller can be started after the pressure decreases to less than 140 psig for shells with 235 psig DWP and 235 psig for shells with 350 psig DWP and the clear fault button is pressed.
Questions engineers ask
What pressure causes CONDENSER - HIGH PRESSURE on a YORK YMC2?
Greater than 200 psig on shells with 235 psig DWP, or greater than 295 psig on shells with 350 psig DWP, as sensed by the Condenser Transducer. The control takes the shell DWP from the condenser model number on the Sales Order Screen.
How do you reset a CONDENSER - HIGH PRESSURE trip on a YMC2?
Wait until the condenser pressure falls to less than 140 psig (235 psig DWP shells) or less than 235 psig (350 psig DWP shells), then press the clear fault button. The chiller can then be started.
Why will the YMC2 not restart after a high condenser pressure shutdown?
The restart is held off until the condenser pressure has decreased below the restart threshold for the shell DWP and the clear fault button has been pressed.
Messages next to this one
The same message on other models
Source
Written from the manufacturer's manuals for the YORK YMC2; every number and designation on this page is checked against them before publication. The row of the manual this message comes from:
All YORK YMC2 messages: fault codes · YORK YMC2 documentation · YORK manuals