2
Vallox
90
K
MC
© VALLOX • We reserve the right to make changes without prior notice.
What the units include can vary depending on the sales area.
Adjustment of supply air temperature and summer/
winter function
The temperature of air coming to the dwelling can be adjusted between circa +10 °C and
+30 °C. The midpoint of the adjustment range is circa +20 °C. When supply air temperature
adjustment has been turned in the OFF position, post-heating is not active. This means that
summer function is activated for the ventilation unit. The unit has a motorised summer/winter
function. When the summer function is on, the heat recovery cell is bypassed as soon as
outdoor air temperature has risen above +14 °C. When outdoor air temperature goes below
+12 °C, the unit starts to recover heat. When supply air temperature adjustment is in the
AUTO position, automatic function is activated for the unit. In this case, the setpoint for post-
heating is +17 °C and the heat recovery cell is bypassed automatically according to outdoor
temperatures as indicated above. When the unit bypasses the heat recovery cell, in which
case summer function is activated, post-heating is off.
Fireplace switch function
It is possible to connect a timer-operated switch to the unit. The switch stops the extract air fan
during the time when the fireplace is heated. NOTE! The starting of the extract air fan may
weaken draught in the fireplace! In winter, this situation may disturb the winter function of the
unit. The situation will normalise in a while, after the fireplace function stops.
Winter function of ventilation unit
A threshold value has been set at the factory for the freezing of the heat recovery cell. When
the threshold is exceeded, the ventilation unit starts to melt the heat recovery cell. Melting is
done by stopping the supply air fan.
A normal melting period takes from 15 to 45 minutes depending on the extent of ice on
the heat recovery cell and on the amount of extract air flow. The unit has been optimised to
operate on the factory settings in normal operation in dwellings and detached houses. The
winter function parameters can be adjusted in extreme conditions, such as in a swimming
bath, but even then it is advisable to contact Vallox Maintenance.
Adjustment of the relationship between supply and extract air
This feature may be useful when adjusting air flows at the valves during mounting. After
the valves have been adjusted, a user does not need, and must not, touch the adjustment.
When needed, supply or extract air flow can be reduced at the potentiometer. When the
potentiometer is approximately halfway, supply and extract air flow have not been reduced.
Turning the potentiometer anticlockwise reduces the air flow on the supply side, and turning it
clockwise reduces the air flow on the extract side.
Maintenance reminder
The unit reminds of the need for maintenance every six months if an indicator (not standard)
has been connected to the connectors of the fault signal relay. The indicator then blinks at
one-second intervals. The maintenance reminder is reset when the door of the ventilation unit
is opened. See the maintenance instructions for information on the necessary maintenance
activities.
Fan speed adjustment
The cooker hood is connected to the ventilation unit and is used to control air circulation in
the whole dwelling. Four operating ranges are available.
Speeds 1, 2, 3 and 4 can be selected at the control switch.
1. Operation during absence. When the dwelling is empty, ventilation can be reduced
temporarily.
2–3. Normal operation. In normal operation, air has to be replaced once every two hours.
4. Boosted operation. Cooking, taking a sauna bath, washing, drying clothes, using
the toilet, having guests or a corresponding situation may cause a need for higher
ventilation than in normal operation.
Cooking
Open the boost flap of the cooker hood during cooking.
At other times, the flap must be kept closed.
An open flap reduces the power of ventilation in other rooms.
Adjustment of supply
air temperature
Supply and extract
air flow adjustment
potentiometer
Fireplace switch,
flush mounting (option)
OPERATING INSTRUCTIONS
Fan speed adjustment
This appliance can be used by children
aged from 8 years and above and
persons with reduced physical, sensory or
mental capabilities or lack of experience
and knowledge if they have been given
supervision or instruction concerning
use of the appliance in a safe way and
understand the hazards involved.
Children shall not play with the appliance.
Cleaning and user maintenance shall not
be made by children without supervision.
