4
CONTROLLER
CONTROLLER / DISPLAY
The display should be checked daily to ensure that
the correct temperature is being maintained.
Switching on your Appliance
Switch the appliance on or off by pressing and
holding
for 3 seconds when it is in standby
mode (display shows “- - -“).
Key to Controls
!
Maintenance indicator
Fan running indicator
LED display (temperature/alarm)
Up and down adjustmen
Enter button
Standby switch
Hi-Lo Alarm
The controller features a built in audio / visual Hi-
Lo alarm. If the temperature within the appliance
exceeds the factory set alarm temperatures for 60
minutes or more, the controller will emit an audible
alarm signal and ‘
AL
’ will flash until the temperature
returns to normal operation.
The audible alarm may be cancelled by pressing any
button. The alarm will go off again after 60 minutes
if the fault has not been addressed. However,
‘hi’
or
‘Lo’
will continue to show in the LED Display until
the cabinet returns to temperature or a fault is
corrected.
If the cabinet goes over a temperature greater than
114°C
, the cabinet will automatically cut out and
an engineer will be required to reset and check the
system.
ADJUSTING THE OPERATING
TEMPERATURE
The thermostat is built in to the controller and is
adjustable between factory set parameters.
All units are factory pre-set, however conditions
on site will vary compared with test conditions
and it maybe necessary to perform the following
adjustments in order to obtain a perfect
temperature cycle.
To adjust operating temperature;
Press and hold
Use keys to adjust.
Then release
.
If no further adjustments are made within 10
seconds, the desired operating temperature will
be stored, and the display will revert to the actual
cabinet operating temperature.
PROBE FAIL SAFE FEATURE
The controller features a fail-safe condition. In the
event of a temperature probe failure,
‘PF1’
will be
displayed.
Should a probe failure occur please contact Williams
Refrigeration Engineering Office on +44 (0) 1553
817000 for a replacement part stating the unit’s
serial number.
CONTROLLER
