Fan
Pulse control
To obtain energy savings it is possible to pulse control the power
supply to the evaporator fans.
Pulse control can be accomplished in one of the following ways:
- during the thermostat’s cutout period (cold room)
- during night operation and during the thermostat’s cutout pe-
riod (appliance with night lid /blind)
A period of time is set as well as the percentage of this period of
time where the fans have to be operating.
Cutout of fans during plant breakdowns
If the refrigeration in a breakdown situation stops, the
temperature in the cold room may rise quickly as a result of the
power supply from large fans. In order to prevent this situation the
controller can stop the fans if the temperature at S5 exceeds a set
limit value.
Light function
The function can be used for controlling the light in a refrigeration
appliance or in a coldroom. It can also be used for controlling a
motorised night blind.
The light function can be dened in three ways:
- the light is controlled via a signal from a door contact. Together
with this function a time delay can be set so that the light is kept
on for 2 minutes after the door has been closed.
- the light is controlled via the day/night function
- the light is controlled via the data communication from a system
unit.
Here there are two operational options if data communication
should fail:
- The light can go ON
- The light can stay in its current mode.
The light load must be connected to the NC switch on the relay.
This ensures that the light remains on in the appliance if power to
the controller should fail.
The light is switched o when "r12" (Main switch) is set to o (see
o98).
The light is switched o when the appliance cleaning function is
activated.
Night blind
Motorised night blind can be controlled automatically from the
controller. The night blinds will follow the status of the light
function. When the light is switched on, the night blinds opens
and when the light is switched o, the night blinds close again.
When the night blinds are closed, it is possible to open them using
a switch signal on the digital input. If this input is activated, the
night blinds will open and the refrigeration appliance can be lled
with new products. If the input is activated again, the blinds close
again.
When the night blind function is used, the thermostat function
can control with dierent weightings between the S3 and S4
sensors. A weighting during day operation and another when the
blind is closed.
A night blind is open when the appliance cleaning function is
activated.
A setting can dene that the night blind is open when "r12" (Main
switch) is set to o (see o98).
When the night blind rolls down, the fans will stop for three
minutes so that the air circulation does not interrupt the
positioning of the blind.
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