CSZ EZT-570i, Техническое руководство

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EZT-570i Technical Manual
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7.1.1.2 Custom Input Description of Use (Dual Refrigeration)
Sys ‘A’ Hi/Lo Pressure Safety (I3): The system ‘A’ hi/lo pressure safety input is used to indicate that
the system 1A or system 2A compressor has exceeded its high
or low pressure operating range. 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 high
pressure safety).
Sys ‘A’ Discharge Thermostat (I4): The system ‘A’ discharge thermostat input is used to indicate
that the system 1A or system 2A 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).
Sys ‘B’ Hi/Lo Pressure Safety (I5): The system ‘B’ hi/lo pressure safety input is used to indicate that
the system 1B or system 2B compressor has exceeded its high
or low pressure operating range. 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 high
pressure safety).
System ‘B’ Boiler Low Water (I30): The system ‘B’ boiler low water input is only used when there are
independent system plenums since this usually results in a boiler
on each plenum. Thus, this input is used to indicate that the
boiler on plenum ‘B’ is low on water. 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).
The low water safety has a built in delay to prevent the activating
of the alarm until the boiler has been given sufficient time to fill
(30 minute delay upon turning on the humidity event). If the
boiler has not filled up in the allotted time, the alarm will sound.
Once the boiler has reached the proper operating level, the
alarm will sound immediately upon loss of level.