VALLOX 90 SE
6
INSTRUCTIONS FOR USE
Remember!
Switch post-heating off when it gets too
warm in the dwelling.
Switch post-heating on again when it gets
cooler in autumn.
2.9. Supply air constant temperature control
• VALLOX 90 SE has a relative post-heating control; when the temperature selected
exceeds supply air temperature by more than 2.5˙C, the radiator is on 100%, and
when the temperature difference gets smaller, the period of active operation is
automatically reduced in two-minute sequences. The adjustment range of heating is
10...30˙C.
• The heating radiator is on when the ( ) sign is displayed.
• Temperature control is only active when post-heating has been switched on.
2.10. Supply air cascade control
• Supply air temperature control can be changed into cascade control.
• It changes the controlling principle of the post-heating radiator. The temperature of air
blown to the ventilation zone is controlled on the basis of extract air.
• The program tries to keep supply air temperature at a value determined by the
difference between extract air and the setpoint as follows: if extract air is warmer than
the setpoint, supply air temperature is lower than the setpoint by the difference. If
extract air is cooler, supply air is warmer by the difference. As an example, if room
temperature is 25˙C and the setpoint 24˙C, the aim is to blow 23˙C air to the
ventilation zone. If the temperature in the ventilation zone is 24˙C and the setpoint is
25˙C, the aim is to blow 26˙C air to the ventilation zone.
• The aim is to keep the temperature of air blown to the ventilation zone always
between 10...30˙C.
• Cascade control can be selected at the control panel, and it is active when post-
heating has been switched on.
• The heating radiator is on when the ( ) sign is displayed.
2.11. Heat recovery bypass function
• The bypass function tries to get as cool supply air as possible to the ventilation zone
by comparing the measuring results of the outdoor air and extract air sensors.
• The heat recovery cell is bypassed when post-heating is switched off, outdoor air
temperature is two degreees more than the setpoint and extract air is warmer than
outdoor air.
• The setpoint can be changed between 0…+25˙C. (Factory setting 12˙C.)
2.12. Heat recovery defrost function and preheating
• Defrost prevents the heat recovery cell from freezing, thus ensuring proper ventilation
even in cold periods.
• In VALLOX 90 SE defrosting is implemented by intermittently stopping the supply air
fan. The stopping function is controlled on the basis of the temperature sensor
measuring the temperature of exhaust air after the heat recovery cell.
• The supply air fan stops when exhaust air temperature falls below +3˙C and starts
when exhaust air temperature has risen to the value set (the amount corresponding to
hysteresis, factory s3˙C. See sections 3.3.19 and 3.3.20).
Preheating
• VALLOX 90 SE is also equipped with an electric preheating radiator. The preheating
radiator enables the defrosting of the heat recovery cell without the stopping of the
supply air fan.
If you wish to use the preheating radiator, you have to change the setpoint for
preheating to +5˙C (factory setting is –3˙C, see section 3.3.21
).
• The preheating radiator switches on before the stopping of the supply air fan and
heats cold outdoor air, thereby preventing the heat recovery cell from freezing.
2.13. Maintenance reminder
• The maintenance reminder switches on the maintenance reminder symbol ( ) in the
main display of the control panel at defined intervals, the factory setting being 4
months.
• The maintenance reminder symbol is acknowledged at the control panel (see the
instructions for using the control panel, section 3.3.7.).
• The interval can be set between 1...15 months at the control panel.
Summary of Contents for 90 SE Series
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