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COMPACT
COMPACT Control System
Controls
The rotary heat exchanger starts up on a heating load. On
an increasing heating load, the control system regulates
the rotation speed of the heat exchanger rotor and thus
the degree of heat recovery efficiency.
Defrosting
In environments where the extract air can occasionally be
humid, the defrosting function can be activated to protect
the heat exchanger from frosting. The function continu-
ously monitors the condition of the heat exchanger rotor
to prevent it from becoming clogged due to condensate
that has frozen inside the rotor passages.
The function requires the connection of a separate pres-
sure sensor (accessory).
When the function is activated the pressure drop across
the heat exchanger is continuously measured. If the pres-
sure drop exceeds the preset limit value, a defrosting se-
quence is carried out. This involves, decreasing the rotor
speed to allow warm extract air to melt any possible frost.
Cooling Energy Recovery
The heat exchanger rotates at max. speed and in this way
recovers the relative cooling energy available inside the
premises. Switches in when there is a cooling load and
when the outdoor air temperature is higher than the ex-
tract air temperature.
Air Purging Operation
The air purging function prevents clogging in the air pas-
sages inside the heat exchanger rotor. Purging opera-
tion is activated when the unit is operating but there is
no heating load and the heat exchanger rotor is idle. The
heat exchanger rotor then rotates for 10 seconds every 10
minutes to purge its surfaces clean of impurities.
Rotation Monitor
The rotation monitor sensor continuously monitors the
heat exchanger. If a malfunction forces the heat exchang-
er to stop, an alarm is initiated and the air handling unit is
stopped if the outdoor temperature is low.
Prolonged Heat Exchanger Operation
After the unit has been ordered to stop, the fans contin-
ue to operate for a certain period before they come to a
stop.
To prevent the supply air from chilling down the premises
when the unit is shut down, the rotary heat exchanger
automatically continues to rotate for about one minute.
Temperature Efficiency Calculation
The temperature efficiency is calculated and displayed (0
– 100%).
General
As the filters become fouled, the pressure drop across
them increases and the speed of the fans automatically
increases to compensate the resistance caused by the
clogged filter medium.
The control system continuously compares the current
filter status with values determined by calibration that was
carried out in conjunction with commissioning and filter
change. An alarm is initiated when the preset alarm limit
for each filter is exceeded.
The current filter status reading can be viewed at any
time.
Filter Monitoring
Estimated Filter Monitoring
Standard function in which the current values are continu-
ously compared with values determined by calibration for
new filters and the degree of fouling is estimated.
Filter Monitoring by Means of Pressure Sensors.
If variations in pressure arise in the ventilation duct
system, for example when VAV regulation is used, the
filter monitoring function can be supplemented with
TBLZ-1-23 pressure sensors. The filter pressure sensors
then continuously measure the current pressure drop
across the filters and in this way ensure correct filter mon-
itoring in this type of ventilation system as well.
Rotary heat exchanger
Filters
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