Helmer Scientific i.Series
®
Ultra-Low Freezer
Service and Maintenance Manual
360173-A/C
33
Problem
Possible Cause
Action
The chart recorder is not
marking the temperature.
The chart paper knob is not tight.
Tighten the chart paper knob.
Stylus pressure is not correct.
Confirm stylus is pressing firmly against paper.
The chart recorder motor has
stopped running.
Remove the chart paper and press the reset button (behind the chart paper).
Reinstall the chart paper.
The chart recorder is defective.
Replace the chart recorder.
6.2
Chamber Temperature Problems
Problem
Possible Cause
Action
The freezer triggers
an “Emergency Mode”
alarmwhen performing a high
temperatur alarm test.
Temperature reading of chamber
probe is too high.
Clear alarm by turning the back-up battery switch and the main power switch
OFF. After 10 senconds, turn back-up battery switch and main power
switch ON.
The “clean Filter” alarm is
activated.
The clean filter time interval has
been reached.
Clean the condenser filter, then acknowledge the clean filter alarm in the event
log to clear the alarm.
The condenser filter is dirty/clogged.
Verify the fan is not physically impeded and check voltage going to the fan
motor. Replace if necessary.
The condenser fan is not operating.
The chamber temperature
displayed is higher or lower
than the actual temperature.
Chamber temperature sensor is not
calibrated.
Check the chamber temperature calibration. Change the calibration if
necessary.
Connections for the chamber
temperature sensor are loose.
Check the sensor wire connection to the control board and secure the
connection if necessary.
Check the continuity of the sensor wiring. Replace the sensor if necessary.
Confirm the sensor is providing resistance in the range of 73 Ω to 110 Ω.
Replace the sensor if resistance is outside of specified range.
Check the CP performance by utilizing jumper at J11. Place the jumper across
both pins. The screen should display 4.0°C +/-1°C.
Digital electronics are locked
because of an interruption in power.
Reset the monitoring system by turning battery and AC power off and back on.
Compressor solid state relay is faulty.
Confirm the relay is operating correctly. Replace the relay if necessary.
A component is faulty or internal
connections are loose.
Contact Helmer Technical Service.
The compressors run
continuously.
Freezer setpoint is set too low.
Confirm the setpoint is set within the operating range and change it if
necessary.
Chamber temperature sensor is not
calibrated.
Check the chamber temperature sensor calibration. Change the calibration if
necessary.
Compressor solid state relays are
faulty.
Confirm the control board indicates both compressors should not be running.
Touch i.C³ APPS, Settings (enter the Settings password), Device Status.
If both compressors should not be running, check the compressor solid state
relays.
If the compressor solid state relays are closed, replace the relays.
i.C³ control board is faulty.
Confirm the control board is calling for both compressors to be running. Touch
i.C³ APPS, Settings (enter the Settings password), Device Status.
If both compressors should be running, no further action is needed.
If both compressors should not be running, check the control board
compressor relays. If the relays are closed, replace the control board.
The chamber temperature
meets an alarm condition, but
the appropriate temperature
alarm is not active.
Temperature alarm setpoint was
changed.
Check the current setpoints for the temperature alarms. Change the setpoints
if necessary (refer to Section II, Item 8.3.1).
