STXC2 User’s guide
Version 2.0
28 of 30
3.3 Clean blowing function - heat wheel.
The heat wheel is rotated for 1 minute every hour if there has been no rotation during one-hour (5V
control signal) to prevent a build up of particulate.
3.4 De-icing function.
If the differential pressure across the heat exchanger rises above a set point value measured by an
extra mounted pressurestat (extra), then de-icing will take place.
3.5 Fan override.
When the measured input value (0-10V the same as 0-100%) on analogue input IN1 on the control
circuit board STXC2 rises above the setpoint, the fan speed will increase so that the air volume
gradually increases to the maximum value, keyed in under the menu “Override set points” See
further information in section 2.9 Reading technical data/Override set points for setting of set points
and maximum air volume.. The display shows the text ”Fan override”.
3.5.1 Override humidity.
The fresh air damper and the exhaust air damper (modulating damper motors) in a mixing section
are overridden to open 100% if the measured humidity is between the setpoint and 10% above the
setpoint. If the humidity rises further, the fan speed increases gradually to set max value.
When the humidity has fallen beneath the setpoint, the fans run for further 10 minutes at the actual
speed.
A ventilation unit equipped with ON/OFF damper motors, only the fan speed increases to 100%,
when the measured humidity is 10% above the setpoint.
At an outdoor temperature in the range from +10 to -10°C the humidity setpoint is gradually
reduced to 10%. Settings see chapter 2.9 Reading technical data / Override set points.
Actual room temp C +20,7
Supply m3h 02500
Monday 12:21
Actual prog no 01
Fan override
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