Controller / Display; Defrost Operation - Williams Medi+ LWMP620 Operating Manual

Natural refrigerant cabinets
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CONTROLLER
CONTROLLER

CONTROLLER / DISPLAY

The display should be checked daily to ensure that
the correct temperature is being maintained.
Temperature set point
To adjust the cabinet temperature set point;
Press the "i" button to display the set point
value.
Keeping the "i" button pressed, use the "▲" and
"▼" buttons to adjust the value.
Releasing the "i" buttons stores the new value.
Information menu
It is possible to display more temperature
information, such as maximum and minimum
temperatures by accessing the information menu.
This can be viewed by pressing the "i" button, and
releasing. Using the "▲" and "▼" buttons the
following information can be displayed;
"t1": Probe 1 (air) instantaneous temperature.
"t2": Probe 2 (evaporator) instantaneous
temperature.
"th1": Maximum probe 1 recorded temperature.
"tL1": Minimum probe 1 recorded temperature.
Whilst accessing the information menu, it is possible
to reset the "th1" or "tL1" recorded values as
follows;
First select either "th1" or "tL1" to reset using
the "▲" and "▼" buttons.
Display the value to reset by pressing the "i"
button.
While keeping the "i" button pressed, press the
"x" button to reset the value.
8
To exit the information menu, either wait 10
seconds, or press the "x" button.
Alarms
An alarm is reported via the display through the
flashing of an abbreviation indicating its cause:
"HI": Cabinet high temperature alarm.
"LO": Cabinet low temperature alarm.
"DO": Door open alarm.
"CL": Condenser cleaning warning (if enabled).
"E1": Failure of probe T1 (Air).
"E2": Failure of probe T2 (Evaporator).
Internal Light
If the Medi+ refrigerator is fitted with an optional
light(s), an independent light switch will be provided,
which will allow control over the internal light(s).

DEFROST OPERATION

The controller will instigate an automatic defrost
cycle. The refrigeration system is turned off whilst
the electric defrost system is switched on. This
defrosts the evaporator coil. The operation raises
the temperature of the Medi+ cabinet slightly for a
short period but does not affect the stored product.
When defrost is in progress, the defrost indicator on
the control panel will become illuminated and "dEF"
is displayed until the defrost cycle has finished.
A manual defrost can be activated by pressing and
holding the
"▼"
button on the controller for 2
seconds.

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