© VALLOX • We reserve the right to make changes without prior notification.
VALLOX TSK
INSTRUCTIONS FOR USE
6
Heat recovery cell bypass with
summer / winter damper
In summer when there is need for cooling, the damper (B) can be
released from the spring behind the support (A). The damper then
goes down upon the cell, preventing flow through the cell. At the
same time, a duct opens behind the cell, letting extract air flow past
the cell. In autumn when the heating season starts, the damper must
be put in winter position by lifting it on top of the spring behind the
support. Damper position change can take place during the
maintenance of filters, for instance. If the unit has electric post-heating,
turn the thermostat to +2
°
C (C) and change it back for winter when
bypass has been turned off, to +13
°
C.
Heat recovery cell antifreeze
The cell is kept unfrozen by a thermostat (inside the electric box),
which stops the outdoor air fan in advance. The thermostat has been
set at the factory to stop the fan when exhaust air temperature goes
down to +5
°
C. The fan restarts as soon as exhaust air temperature
goes up to +10
°
C. The setpoint of the thermostat can be changed
afterwards. If freezing takes place in the cell, the threshold may be
raised by turning the spindle clockwise, and if the fan keeps stopping
too early, the threshold may be lowered. Spindle positions have
been marked on the inner surface of the electric box cover. NOTE!
Even a change of one or two degrees has a substantial impact.
Post-heating
The unit may have electric (D, 1000 W) or water-based post-heating.
The thermostat (C) for electric heating is confined to about
2…14
°
C. The water radiator may be controlled by a self-actuated
thermostat, which has been installed inside the ceiling behind the
unit, or inside the room. Post-heating does not require special
maintenance.
Heat recovery
bypass on
(summer position)
Heat recovery
bypass off
(winter position)
A
B
A
B
C
Thermostat and post-
heating radiator
D
