Vallox 280 SE Instructions for use and maintenance manual - Vallox 280 Se
VALLOX 280 SE
INSTRUCTIONS FOR USE
5
1.9. Post-heating (option)
For most of the year, heat recovered from the air being extracted is enough to warm the cold
air coming from the outside to a suitable temperature. If the heat of extract air is not enough,
air coming from the outside may be heated further, as needed, with a post-heating unit in the
unit.
The post-heating radiator may be electric or water-circulating. Heating can in both cases be
activated at the control panel (see the instructions for using the control panel, Section 2.1.).
When heating has been activated, the unit automatically adjusts the temperature selected.
1.10. Supply air constant temperature control
• VALLOX 280 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 for 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.
1.11. 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 colder,
supply air is higher than the setpoint by the difference.
If the temperature in the ventilation zone is 25
°
C and the setpoint is 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 within the
range of 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.
1.12. 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 higher than the setpoint by two degrees and extract air is warmer than
outdoor air.
• The setpoint can be changed within the range of 0…+25
°
C. (Factory setting 12
°
C.)
1.9.
© VALLOX • We reserve the right to make changes without prior notification.