SUMMARY Legacy Micro-Processor compatibility with remote and Chiller Guard Ethernet IP device. RESOLUTION The attached chart provides detailed compatibility information on Legacy’s micro processor controllers. Customers looking to add a remote micro-processor or Chiller Guard Ethernet IP device should review this document. In cases that existing host micro-processor controllers have firmware that is out of […]
Micro processor – Dual Compressor Lag Lead
SUMMARY Micro processor – Dual Compressor Lag Lead. Understanding how it works. SYMPTOMS On a dual compressor system CP2 may start on a first stage cooling call. CAUSE The chillers micro-process controller logs total run hours of each compressor. From a NO call condition, when process fluid gets to SP1 + dif1 the micro-processor will […]
Micro Processor J10 Alarm Contacts
SUMMARY Article covers basic information on the Legacy Micro Processor J10 alarm relays. RESOLUTION Located on the back of the Legacy chiller micro processor controller (top right), there is a J10 terminal designation that is used for remote alarm connections. This block contains a Common (com), normally open (NO) and normally closed (NC) set of […]
Water Cooled Condenser Design Flow Rate Issues
SUMMARY How to determine design flow rate on a water cooled condenser – By Legacy Chiller Systems. SYMPTOMS Water cooled chiller tripping on hi1 (high head) or running higher than normal head pressures. CAUSE This can be caused by several factors: 1. Low condenser cooling water flow. 2. Higher than normal condenser water inlet temperature. […]
Micro-Processor showing 32 and 32
SUMMARY Micro-Processor showing 32 and 32. SYMPTOMS Micro-processor displays 32 and 32 on both top and bottom temperature displays. While in this condition, these temperatures do not change. CAUSE Possible defective sensor(s). One or both temperature sensors are not working property. RESOLUTION Replace both sensors. Note: Replacement may arrive with plastic molded plugs. Older micro-processor […]
hi1 or hi2 compressor shut down
SUMMARY Chiller trip on high head pressure after 60-90 seconds. Possible issue hang with liquid line solenoid. SYMPTOMS Compressor runs for 60 to 120 seconds then shuts down on micro processor hi1 or hi2 pressure trip. CAUSE Possible issue with liquid line solenoid no fully opening. In rare cases, the Sporlan liquid line solenoid my […]
Remote Micro – Can’t turn chiller on and off
SUMMARY Remote micro-processor use – By Legacy Chiller Systems. SYMPTOMS Using remote micro processor user can’t turn chiller on and off. CAUSE Remote micro processor is in review mode. RESOLUTION Press and hold the PUMP and UP buttons at the same time for 3-5 seconds. Control will as for pass code. Using the UP and […]