Alarms
The controller is preset with an alarm that will sound, should the monitored temperature go
outside of the official Controlled Room Temperature range (+15°C – +25°C) for more than 2
minutes.
*
In the case of an alarm, the screen will show
or
(according to the nature of the alarm) and the
alarm LED ( ) will light.
To silence the sounder, press
. If the alarm condition continues for some time, the sounder will
resume (it can be silenced again if required)
There are voltage free contacts on the rear of the unit, which can be connected to an external
alarm system if required. These will activate whenever the unit is in an alarm state. There are
three contacts: COM, NO and NC. To attach these to an external system, contact your alarms
systems administrator.
Set Temperature
The cabinet is preset to control with the official Controlled Room Temperature range (+15°C –
+25°C). As control is based on measured temperature, rather than heating / cooling power, in
normal circumstances it will not be necessary to change the set point (control temperature) of the
controller.
To change the set point, if desired, from the main screen press P. The screen will alternate between
�
and the current set point. Use the arrows to adjust it and press P again to confirm. Please note
that the set point is limited to between 17 and 21 °C
If the monitored temperature is regularly reaching outside Controlled Room Temperature limits
(causing high or low alarms), please call your supplier for technical assistance.
Please note that the ambient temperature around the cabinet will affect the rate of change of the
internal temperature and extremes may lead to high or low alarm states.
Regular calibration and servicing is recommended to ensure continued correct operation and so as
to avoid reducing the life of the cabinet.
Defrosting
Due to the temperature range of the cabinet, regular frosting of the evaporator plate should not be
an issue, however it is possible to perform a short off-cycle defrost. Should you need to force a
defrost, press and hold
until the defrost LED ( ) lights.
Lock
For security, the cabinet is fitted with a key lock (in the control panel). Please keep the key(s) safe
and keep a record of any key numbers so that replacements can be issued if required.
*
To allow the cabinet to reach temperature, the alarm is inhibited for the first 45 minutes after start up.
MCRTL21.1 5
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