CSZ EZT-570i, Technical Manual

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EZT-570i Technical Manual
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redundant operation is specified, the EZT-570i will display the readings from the
operating plenum. If tandem operation is specified, the EZT-570i will display the
average reading from both plenum control loops.
Refrig Cycle Time
The refrigeration cycle time sets the interval period used for redundant refrigeration in which the EZT-
570i will alternate between systems to equalize run time.
Refrig Overlap Time
The refrigeration overlap period sets the time period for redundant refrigeration in which the systems
will overlap to allow the system that is just starting enough time to get to operating temperature.
Typically required for cascade systems to allow the stager start delay period to expire prior to turning
off the currently operating system.
Floodback Alm Band
The floodback alarm band is used for Tundra II systems to set the mnimum superheat allowed at the
suction of the compressor to prevent liquid floodback from damaging the compressor. The “Tundra
Floodback Alarm” must be enabled for this setting to be used. When enabled, and the superheat falls
below this setting, the maximum cool output is disabled and the alarm delay is activated.
Floodback Alm Dly
The floodback alarm delay is used for Tundra II systems to set the alarm delay period when a
floodback condition is detected based on the superheat falling below the floodback alarm band
setting. The “Tundra Floodback Alarm” must be enabled for this setting to be used.
Tundra Floodback Alarm Enable/Disable
The Tundra floodback alarm is used for Tundra II systems to detect a floodback condition at the
compressor which could lead to compressor damage due to liquid slugging. When enabled, logic in
the EZT-570i will be activated and use a 9300 controller to monitor the suction temperature and
pressure at the compressor and shut down the system if a floodback condition is detected.