CSZ EZT-570i, Техническое руководство

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EZT-570i Technical Manual
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requires pumpdown, this input is wired to a low pressure switch
on the suction line of system 1 compressor. When the pressure
rises, the switch closes and turns on the input.
The EZT then turns on the system 1 compressor output (Q3)
until the input turns off. When the input turns off, indicating that
the compressor has pumped down, the EZT turns off the system
1 compressor output. During pumpdown, the system 1 solenoids
output (Q30) remains off in order to isolate the low side of the
refrigeration system so it can be pumped down.
Sys1 Oil Pressure Safety (I33):
The system 1 oil pressure safety input is used to indicate that the
system 1 compressor oil pressure is below the proper operating
range (if equipped). This input is active low, i.e., the input must
be off in order for the alarm to be indicated. When active (input
off), the EZT shuts down the chamber until the alarm is
acknowledged (silence button pressed on alarm monitor screen)
and the input is on (requires manual reset of oil pressure safety).
Sys1 Protection Module (I34):
The system 1 compressor protection module input is used to
indicate that the system 1 compressor protection module has
detected an improper phase condition/loss or the compressor
motor windings have overheated (if equipped). This input is
active low, i.e., the input must be off in order for the alarm to be
indicated. When active (input off), the EZT shuts down the
chamber until the alarm is acknowledged (silence button pressed
on alarm monitor screen) and the input is on (automatically
resets after built-in timeout period).
Sys2 Discharge Thermostat (I35): The system 2 discharge thermostat input is used to indicate that
the system 2 compressor discharge temperature has exceeded
the maximum operating range (if equipped). This input is active
low, i.e., the input must be off in order for the alarm to be
indicated. When active (input off), the EZT shuts down the
chamber until the alarm is acknowledged (silence button pressed
on alarm monitor screen) and the input is on (automatically
resets after allowed to cool down).
Sys2 Oil Pressure Safety (I36):
The system 2 oil pressure safety input is used to indicate that the
system 2 compressor oil pressure is below the proper operating
range (if equipped). This input is active low, i.e., the input must
be off in order for the alarm to be indicated. When active (input
off), the EZT shuts down the chamber until the alarm is
acknowledged (silence button pressed on alarm monitor screen)
and the input is on (requires manual reset of oil pressure safety).
Sys2 Protection Module (I37): The system 2 compressor protection module input is used to
indicate that the system 2 compressor protection module has
detected an improper phase condition/loss or the compressor