Issue:
Low Evaporator Temperature: Unit Off
Resolution:
CH530 Controls:
Any of the evaporator saturated temperatures fell below the water temperature cutout setting while the respective evaporator liquid level was greater than 21.2mm (-0.83 inch) for 30 degree F seconds while Chiller is in the Stop mode, or in Auto mode with no compressors running.
- Energize Evap Water pump Relay until diagnostic auto resets, then return to normal evaporator pump control.
- Automatic reset occurs when either the evaporator temp rises 2F (1.1C) above the water temp cutout setting or the liquid level falls below 21.2mm (-0.83 inch) for 30 minutes.
LWTC - Leaving Water Temperature Cutout
- The LWTC (or Chilled Water Temperature Cutout) should be set to 5F below the lowest allowable Chilled Water Set Point based on the % Glycol.
Notes:
Changes:
Other Question/Problem/Cause Statements:
- Low Evaporator Temperature...Unit Off?
- Low Evaporator Temperature Circuit 1: Unit OFF?
- Low Evaporator Temperature Circuit 2: Unit OFF?
- Low Evap Temp Unit Off?
Facts:
- Air-Cooled Chiller (Pueblo) (RTAC)
- Water-Cooled Chiller (Pueblo) (RTHD)
- Chiller has glycol.
- Cold ambient temperatures.
Document Identifier: DOC-86091
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.