MANUALP/4000_SERVICE_0712 July2012
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[8-.-] Moderate Electrical Noise on mains power supply
Interference has affected the microprocessor. This should occur
only rarely. If persistent, check mains for Electrical Noise.
Cancelled by pressing TEMP button.
[9-.-] Severe Electrical Noise on Mains
As above for [8-.-] but more serious, check mains wiring and
earthing. Look for outside interference. Turn off, turn on, Check
Set points and recalibrate.
Cancelled by pressing TEMP button.
CO
2
CHANGEOVER
If the CO
2
CHANGEOVER option has been purchased it will allow the cabinet to
automatically change from the current bottle (when empty) to the next bottle in
the sequence No1-No2-No1-No2-No1 etc. The detection of a bottle being
empty is determined from the recovery time to reach the CO
2
set point.
There is one alarm associated with the CO
2
control. [2-.-].
Alarm [2-.-] is associated with the controller being unable to detect a rise in the
CO
2
level in the cabinet even though it is attempting to inject CO
2
. It will usually
be due to the CO
2
bottle being empty.
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