CSZ EZT-570i, Technical Manual

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EZT-570i Technical Manual
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Do not change the refrigeration type to any selection other than what is installed on
the chamber and called out on the EZT Configuration form supplied with the chamber
or the refrigeration system may not operate properly and damage may occur.
Cmp On %: Sets the loop percentage of output required to turn enable the refrigeration
system because cooling is required.
Cmp On Dly: Sets the delay in seconds for which the loop output must exceed the cmp on %
before the refrigeration system is turned on.
Cmp Off %: Sets the loop percentage of output required to disable the refrigeration system
because cooling is no longer required.
Cmp Off Dly:
Sets the delay in seconds for which the loop output must exceed the cmp off %
before the refrigeration system is turned off.
Stager Dly: Sets the stager start delay time in seconds for system 2 on cascade systems.
Defrost: Sets the defrost mode based on installed defrost components.
- “Defrost On” is used for smaller compressors (typically smaller than 7.5hp)
- “Large HP Defrost” is used for larger systems (typically larger than 7.5hp)
The large horsepower defrost is used to control the cascade condenser liquid line
cooling solenoids on cascade systems. It cycles the solenoids on and off to
maintain system 2 head pressures rather than cycling the system 1 compressor
on and off. Cycling large horsepower compressors is detrimental to the life of the
compressor and is not recommended by the manufacturer.
The “
alternating ” defrost selections are only used for redundant refrigeration
systems that use independent conditioning plenums. This allows one system to
go into defrost while the other system conditions the chamber. The “Ind Plenum”
(independent plenums) selection under the advanced settings must be selected
prior to selecting an alternating defrost mode or the selection will not be
accepted.
Pumpdown On/Off: Enables or disables pumpdown mode.
PumpDown Reset Time Out: Sets the time in seconds for which the chamber can be without
power before pumpdown will be disabled and require manual
reset or the four hour automatic reset delay.