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vwr.com I Instruction manual VWR
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ULT Freezer 352/528 Eco Premium 02/2022
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Alarm messages overview:
Condition
Alarm message
Moment of Alarm message and
switching the zero-voltage relay
alarm output
Chamber door open
“Door open”
after configurable time (chap. 14).
Factory setting: 1 minute
Exceeded setpoint of the safety
controller
“Safety controller”
immediately
The current actual temperature
value is outside the tolerance range
(chap. 14)
“Temp. range”
after configurable time (chap. 14).
Factory setting: 60 minutes
Continuous compressor operation,
refrigeration system defective. Con-
tact Avantor Services.
“Continuous operation”
•
12 hours after start-up, if the set-
point wasn’t reached
•
60 minutes after reaching the set-
point
Clean / replace the condenser air
filter (chap. 23.3.1)
“Condenser temp.”
immediately
Compressor defective. Contact
Avantor Services.
“Compressor defective”
immediately
Inner temperature sensor defective.
Control continues using the safety
controller temperature sensor
“Inner temp. sensor”
immediately
Safety controller temperature sen-
sor defective
“Safety control sensor”
immediately
Inner temperature sensor and
safety controller temperature sen-
sor defective. Refrigeration is
turned on permanently.
Temperature display
shows “- - - - “ or
“<-<-< “ or “>->->”
Messages alternating:
Inner temp. sensor and
Safety control sensor
immediately
Failure of Pt100 temperature sen-
sor on the condenser of the refrig-
erating machine. Refrigeration is
turned on permanently.
“Condensate temp.
sensor”
immediately
Failure of Pt100 temperature sen-
sor on the cascade of the refrigerat-
ing machine.
“Cascade temp. sensor”
immediately
Failure of Pt100 temperature sen-
sor for ambient temperature or air
intake of the 1
st
stage cooling (re-
frigerating machine).
“Ambient temp. sensor”
immediately
Power failure
--
immediately (alarm output only)
Press the
OK button
to confirm the alarm.
•
Confirmation while the state of alarm persists: Only the buzzer is muted. The visual alarm message
continues to be displayed until the alarm condition is removed. Then it is reset automatically.
•
Confirmation after the alarm has ended: The buzzer and the visual alarm message are rest together.