18
Optima 300
5. Function
5.1 Control system Optima 300
Room regulation:
The room temperature is controlled by the room sensor
T2, which is fitted in the control panel. If a temperature
of e.g. 21°C has been configured, the compressor will
start when the room temperature falls to 20.6°C the
compressor will stop when it has increased the room
temperature to 21.4°C. If the compressor cannot maintain
the room temperature, the motor-operated valve (devices
with water after-heat surface) will begin to regulate (PI
regulation) when the room temperature has fallen to
20°C.
For devices with electric after-heat surface divided into
up to 4 levels, the first level will engage when the room
temperature has fallen to 20°C. If the regulator time is set
to e.g. 3 minutes, the room sensor will measure after 3
minutes whether the room temperature is now above or
below 20°C.
Level 2 will engage if the temperature is still under 20°C.
When the room temperature at some point reaches
20°C, the electrical heat levels will begin to disconnect
at 3-minute intervals. When the cooling (from +3°C to
+10°C) starts, the diffusion and extraction fan engages
at speed 3 and the cooling valve MA 7 opens so that
the condenser on the diffusion side becomes a cooling
surface and the cooling surface on the extraction side
becomes a condenser.
When the room temperature has fallen 1°C, the
compressor stops and the fan returns to normal
operation.
The cooling valve MA 7 only closes when the bypass
function is closed.
If an extra cooling device is fitted to the system, this will
engage when the room temperature is 2°C higher than
start cooling.
Devices with an electrical pre-heat surface will regulate in
the same way as an electrical after-heat surface.
Defrosting
The device begins defrosting when the temperature
difference between the temperature before the cooling
surface and the cooling surface becomes too big, which
occurs when ice forms on the cooling surface.
The magnetic valve MA 4 opens, the diffusion fan and
the electric heats surfaces stop until the ice is melted and
the cooling surface has reached a temperature of about
5°C, after which the magnetic valve closes again and the
diffusion fan and electric heat surfaces start again.
5.2 Extra capacity
Electrical after-heat:
If there is a greater requirement for heat that the unit
can supply, the electric after-heat can be configured
(additional equipment) to ON in the main menu with the
shortcut key.
5.3 Operating reliability
High pressure switch:
In order to protect the compressor from running more
than intended, a high pressure switch is built in that will
disconnect when the pressure becomes too great. The
red reset button on the pressure switch is activated in the
cabinet when the cause of the fault has been found.
Overriding of the diffusion fan:
If the diffusion temperature increases to over 45°C, the
diffusion fan’s speed will begin to increase.
The diffusion temperature will be maintained at 45°C if
possible.
Overriding of the extraction fan:
If the discharge temperature for cooling increases to
over 45°C, and the extraction speed at level 3 is not
configured to 100 %, the extraction fan speed will
begin to increase. The discharge temperature will be
maintained at 45°C if possible.
