Vallox 75 Specification sheet

INSTRUCTIONS FOR USE AND MAINTENANCE
• 1.09.292E
• 13.02.07
© VALLOX
For blocks of flats, terraced houses
and detached houses.
Supply and extract air
ventilation with heat recovery
Type: 3510

© VALLOX • We reserve the right to make changes without prior notification.
VALLOX 75/95 has been initially adjusted for
normal circumstances in your home.
Ventilation adjustment is needed mainly in the
following circumstances:
2
2
VALLOX 75/95
MAIN PARTS
2
2
VALLOX 75/95
1. Extract air fan
VALLOX 75 105 W
VALLOX 95 180 W
2. Supply air fan
VALLOX 75 105 W
VALLOX 95 180 W
3. Heat recovery cell
4. Damper for summer/
winter ventilation
5. Outdoor air coarse filter G3
EVERYDAY QUICK GUIDE
• Taking a bath
Boost ventilation in bathing and washing
facilities in order to ensure that the rooms
get dry as quickly as possible. It is recom-
mended to have boosted ventilation on for
2 to 3 hours after taking a sauna bath.
• Washing and drying clothes
Boost ventilation in washing and drying fa-
cilities during these activities.
• Sleeping
Ventilation in a bedroom has to be suffi-
cient throughout the night. The level is cor-
rect when air does not smell fusty when
you enter the room in the morning.
• Empty dwelling
To save energy, ventilation can be adjusted
to the minimum level.
• Cooking
When the ventilation unit is integrated with
a cooker hood, boost ventilation while
cooking food (the most common way in
blocks of flats to abate cooking fumes.
Small detached houses and terraced
houses are normally equipped with a sepa-
rate cooker hood.
6. Outdoor air fine filter F7
7. Extract air coarse filter G3
8. Electrical connection box
9. Post-heating radiator 500 W (in picture)
or, in VKL models, water radiator
10. Post-heating radiator regulating thermostat
11. Condensing water outlet (below the unit)
12. Cell antifreezing sensor
13. Safety switch
14. Electrical quick-connect terminal for fans
15. Overheat protection reset button
2
3
4
5 67 89
10
11
12 1 14
14
15 13

3© VALLOX • We reserve the right to make changes without prior notification.
Autumn
• Wash or change the coarse filter and clean
or change the fine filter if needed.
• Check that the heat recovery cell is clean.
• Check that the condensing water outlet is
not clogged.
Spring
• Wash or change the coarse filter and clean
or change the fine filter if needed.
• Clean the fan blades and the post-heating
unit if needed.
• Check that summer ventilation is in opera-
tion.
VALLOX 75/95
BASICS OF VENTILATION
THREE QUESTIONS ABOUT VENTILATION
Why is air replaced in dwellings?
Good ventilation promotes healthy living for both residents and the building. Air in a dwelling needs to
be replaced in order to remove humidity brought about by living and impurities emanating
from structures and human bodies. Impurities of indoor air include carbon dioxide, formaldehyde,
radon and other gases as well as dust.
Mechanical ventilation is needed for adjusting air circulation as needed by the residents.
In a well sealed house, air does not circulate sufficiently by natural means. Even in a poorly
sealed house air is only replaced because of differences between indoor and outdoor air
temperatures, or because of winds. This means that ventilation is dependent on weather
conditions and cannot be regulated.
It is especially important that humidity and carbon dioxide content of the indoor air stay at
a healthy level. Recommended humidity content of good indoor air is approximately 45%.
Humidity content is lower in winter and higher in summer and autumn. Dust mites thrive in
indoor air if humidity exceeds 50%, and if humidity stays at over 60% for a long time in
winter, water condenses in the cold structures of the house and mould starts to form.
The recommended maximum carbon dioxide content in good indoor air is circa 1,000 ppm.
What are the characteristics of adequate ventilation?
• Indoor air stays fresh in all the rooms of the dwelling, also in bedrooms during night.
Without adequate ventilation, carbon dioxide content tends to rise high especially in bedrooms.
• The bathroom and the sauna get dry quickly.
• During the heating season, the windows and other outer wall structures remain dry.
• Humidity in indoor air is not condensed in the ventilation ducts.
• Air is fresh in the toilet as well.
How much air is replaced?
For air to be clean to breathe, it has to be replaced with outdoor air every two hours. In a
new and a renovated house, air circulation needs to be boosted during the first year in order
to remove harmful gases and structural humidity. In buildings that are more than a year old
and dry, ventilation can be regulated as needed. Ventilation is boosted during for instance
a sauna bath, clothes washing and cooking, and reduced during very cold periods or when
there is nobody at home.
Window ventilation
Dwelling-specific supply / extract air circulation does by no means prevent you from opening
windows and the door to the balcony or airing through them.
In window or door ventilation attention needs to be paid to the following factors:
During the heating season window ventilation consumes, uncontrollably, a considerable
amount of energy.
An open window lets in dusty and dirty air.
An open window also lets in noise pollution.
3
SEASONAL CALENDAR
NOTE!
For further details, see inner
pages.

VALLOX 75/95
4
VENTILATION SYSTEM
WARNING
Shutting down ventilation in the
dwelling also prevents the inflow of
new fresh outdoor air to the dwelling
and the outflow of dirty air and
impurities emanating from human
bodies, structures and the soil, such as
carbon dioxide, humidity, odours,
formaldehyde, dust and radon.
These impurities quickly spoil indoor
air and cause health problems,
whereas excessive humidity may spoil
structures and cause mould and fungus
growth. Therefore, the building
regulations require ventilation to be
continually in operation and the level
of ventilation to be adjusted as needed
by the user.
!
As the name says, a dwelling-specific ventilation system (blocks of flats, terraced houses,
small detached houses) is meant for only one dwelling.
The system includes two sides. The extract air side takes dirty and humid air out, while the
supply air side brings a corresponding amount of outdoor air in.
Ventilation in the rooms is continual and can be regulated as needed. Outdoor air is mainly
brought to the bedrooms, sitting room, fireplace room, dining room and sauna. From these
rooms supply air can flow freely, for instance through door vents, to the bathroom, sauna,
toilet, walk-in closet, kitchen and other rooms with air vents. If cold outside air can be let in
to the sauna, only use it when it is needed as combustion air for a wood-heated sauna oven.
The resident may regulate the power of ventilation (air circulation) as needed.
Filtering
Outdoor air is filtered before taking it in to the dwelling. A coarse filter first removes the
biggest litter particles, thereby preventing the system from getting dirty. After that air passes
through a fine filter, which catches finer dust and even the smallest pollen particles.
Filter guard (option)
An optional filter guard for the unit monitors the cleanliness of the unit and the filters. The
setpoint of the filter guard is set individually for each dwelling so that the filter guard indicator
lights up at fan speed 3 or 4 when the filters are clean .
Heating of outdoor air
During the heating season, heat included in extract air is used to heat air coming from the
outside. Heat is transferred in the heat recovery cell through laminas, and extract air never
mixes with air coming inside. This may provide all the heating needed. The ventilation units
are, however, equipped with a post-heating radiator, which can be used to warm air if more
heating is needed.
Warm
extract air
+22 °C
Fresh
outdoor air
-5 °C
Preheated
fresh air coming in
+13 °C
Cooled
extract air going out
+12 °C
HEAT RECOVERY UNIT
Winter and frosts
When temperature in winter falls below –10…–20 °C, the intake of outdoor air is limited
by stopping the supply air fan. This prevents the water condensing in the unit from extract
air from freezing.
For indoor air to stay healthy and beneficial also for the structures of the dwelling, ventilation
has to be in operation continually. It is not advisable to stop ventilation even for longer
holidays, because it makes indoor air stuffy. Also, during the heating season indoor air
humidity may condense in the ducts and structures and therefore cause humidity damage.
Filter guard indicator lamp

© VALLOX • We reserve the right to make changes without prior notification.
VALLOX 75/95
INSTRUCTIONS FOR USE
5
Initial adjustment
The ventilation system works properly when air flows in the rooms have been measured and
adjusted with the valves in accordance with the planned values. After the initial adjustment, the
position of the ventilation valves must not be changed. If there is an outlet valve with a knob in the
ceiling of the sauna, it can be adjusted as needed. The initial adjustment ensures that a
sufficient amount of air is circulated and that extract air flow is always greater than supply
air flow, i.e. the dwelling is negatively pressured compared to outdoor air. If the dwelling
is positively pressured, air in the dwelling penetrates the outer envelope of the building and
between windows, which may cause humidity damage during the heating season.
In normal conditions basic ventilation with change of air every two hours is sufficient in living
areas. Boosting is needed during for example sauna baths, cooking, clothes washing or
family parties.
If the user does not know the measured air flows, the adjacent table shows approximate
extract air flows as well as the total electricity consumption of the fans at various fan speeds.
The table also shows the fan speed that is sufficient for recommended basic ventilation in
dwellings of different sizes.
The switch positions, i.e. fan speeds, displayed in the table on a darker background are
factory preset values. If needed, an expert or electrician can change (or has changed during
the initial adjustment) settings and select speeds shown on a white background instead.
Voltage changes are also made by an expert, not the user himself.
SWITCH POSITION 1
70 V
1.1
90 V
VALLOX 95 (180 W fan)
Living area (m2)
Air flow (dm3/s)
Total electricity
consumption of
fans (W)
2
120 V
2.1
135 V
3
160 V
3.1
180 V
4
230 V
40
20
40
70
30
63
140
50
103
150
55
124
200
70
158
210
75
183
240
85
225
SWITCH POSITION 1
70 V
1.1
90 V
VALLOX 75 (105 W fan)
Living area (m2)
Air flow (dm3/s)
Total electricity
consumption of
fans (W)
2
120 V
2.1
135 V
3
160 V
3.1
180 V
4
230 V
30
15
25
45
20
38
85
30
63
110
40
78
140
50
104
150
55
128
200
70
182

1234
Separate cooker hood (most often in detached houses)
If there is a cooker hood independent of the ventilation system in the dwelling, only use it when
needed. Using it does not affect the operation of the ventilation unit, because the unit replaces
air in other rooms. There is in this case minor ventilation in the kitchen connected to the ventilation
unit. The unit is controlled with a separate control centre.
Cooker hood LTX
Control centre with a separate switch
© VALLOX • We reserve the right to make changes without prior notification.
VALLOX 75/95
6
INSTRUCTIONS FOR USE
Adjustment of the power of ventilation
VALLOX 75 and VALLOX 95 ventilation units can be controlled with either a cooker hood or
a separate control centre.
Cooker hood control
The cooker hood is connected to the ventilation unit and is used to control air circulation in the
whole dwelling. Four power ranges are available.
Speed 1.
Use during absence. When the dwelling is empty,
ventilation can temporarily be diminished.
Speeds 2 and 3.
These are speeds that are normally used.
Speed 2 is used when the need of
ventilation is fairly small and air is good.
Speed 3 is used when there is a need for boosting,
for instance in the following situations: cooking,
taking a sauna bath, drying clothes, use of toilet,
guests, excess heat and "large dwellings".
Speed 4.
This boosting position is used as needed, for example during
cooking, parties and hot weathers.
Cooking
Open the flap of the cooker hood during cooking. At other times,
the flap must be kept closed. An open flap decreases the power
of ventilation in other rooms.
There are different kinds of cooker hoods. For more details, see
the instructions of the hood in question.
Separate control centre
The regulator (switch) is only used to control the ventilation unit. There are four power ranges
available.
Speed 1.
Use during absence. When the dwelling is empty, ventilation can temporarily be diminished.
Speeds 2 and 3.
These are speeds that are normally used.
Speed 2 is used when the need of ventilation is fairly small and air is good.
Speed 3 is used when there is a need for boosting – for instance in the following situations:
cooking, taking a sauna bath, drying clothes, use of toilet, guests, excess heat and "large
dwellings".
Speed 4.
Boosting position, used as needed for example during cooking, parties and hot weathers.
Cooking
Cooking fumes are taken out with a cooker hood or an integrated hood and ventilator.
For more instructions, see the instructions of the equipment in question.
Detailed instructions for special control centres are available.
The table on the preceding page
indicates rated speeds and air
flows for dwellings of different
sizes.
The table also indicates the total
electricity consumption of the fans
at each speed.

VALLOX 75/95
T
T
P
L
Y
Y
ø 12mm
© VALLOX • We reserve the right to make changes without prior notification.
7
INSTRUCTIONS FOR USE
Curve 1 Temperature of the air coming from the unit to the dwelling at
different outdoor temperatures when the post-heating radiator
is not on.
Curve 2 Supply air temperature controlled by the thermostat of the
electric radiator, adjustment value 23 °C (air flow less than 38
dm3/s
Curve 3 500 W post-heating resistor can heat 50 dm3/s flowing air by
about 8 °C.
Curve 4 Supply air temperature with water radiator, water +25 °C and
flow 0.05 dm3/s.
Curve 5 Supply air temperature with water radiator, water +45 °C and
flow 0.05 dm3/s.
Electric radiator
Example: Warming of outdoor air in the HR cell with electric radiator Temperature of air going from the unit to the dwelling
HR cell antifreezing starts to function
Temperature of outdoor air coming to the unit
Because heat release of water radiator is dependent on many factors, the
curves are approximate. Glycol decreases radiator power with 10...20
% depending on mixture.
Post-heating
For most of the year, heat recovered from air to be 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 with the radiator delivered with the unit.
Post-heating with electric radiator
VALLOX 75 and VALLOX 95 come standard with a 500 W electric radiator for heating
supply air. The temperature of supply air is adjusted at the thermostat regulator located
inside the unit. Adjustment range of temperature is approximately +0...+25 °C.
It is advisable to set the thermostat at 0 °C in summer. In this case, the radiator does not
heat air, as the heat recovery cell is bypassed.
Post-heating with water radiator (VKL model)
VKL models come standard with a water radiator (P). Temperature of air going from the
unit is adjusted with the controller of self-actuated thermostat valve (T).
Water radiator defrosting
The defrost thermostat (T) of the post-heating radiator (P) stops the unit when the temperature
of water radiator goes below the threshold value, preventing the risk of freezing in the
water radiator. This also causes self-actuated one-way dampers (Y) to close, preventing
the flow of outdoor air to the unit. The unit starts automatically as soon as the risk of freezing
has passed. The threshold temperature of the risk of freezing can be set at the thermostat
(T).
WARNING!
Though VALLOX 75 / 95 VKL units have an efficient freezing protection for the radiator,
there is always a risk of freezing in the radiator unless non-freezing heat transfer solution
is used. If the unit stops altogether (extract and supply air fan) in winter, the cause must
be defined in order to prevent heat transfer solution (water) from freezing. In winter the
automatic defrost function of the heat recovery cell keeps stopping the supply air fan; this
is normal.
AIR FLOWS 35/30 dm3/s
Temperature of outdoor air coming to the unit
The curve is approximate; heating is always dependent
on operating conditions.
Temperature
of extract
air
coming to
the unit

VALLOX 75/95
INSTRUCTIONS FOR USE
In winter use
the heat recovery cell of VALLOX 75 and VALLOX 95 recovers heat from the air leaving
the dwelling and uses it to heat the air coming from the outside. The damper is in down
position.
In summer use
when it is warm outside, it is unnecessary to heat outdoor air. The heat recovery cells are
then bypassed with the damper (A) coming standard with the unit. The damper is lifted up
and locked with a lock (B). In the summer position air flow through the cell is prevented,
and heat recovery bypass is activated. In summer set the electric post-heating thermostat
at 0 °C position so that the radiator will not heat. If needed, the setpoint value of the water
radiator thermostat shall also be reduced.
Defrosting
Water condensing from extract air may freeze in the heat recovery cell. Freezing can be
prevented by stopping the supply air fan (standard function). The VKL model also includes
a water radiator defrost thermostat, which stops both fans when there is a risk of freezing
in the radiator.
Stopping of supply air fan
The defrost thermostat stops the supply air fan whenever the temperature of exhaust air goes
down to circa +4 °C. The fan restarts when temperature has risen by three degrees, i.e.
to 7 °C. The threshold value of the thermostat can be adjusted. The function starts at the
outdoor temperature of about -10…-15 °C.
A
B
A
B
SUMMER/WINTER VENTILATION

VALLOX 75/95
9
MAINTENANCE INSTRUCTIONS
Filters and heat recovery cell.
The units are available in right and left handed
models. In the right handed model (model R)
outdoor air comes to the unit from the right side
of the centre line as shown in the instructions.
In the left handed model (model L) outdoor air
comes from the left side of the unit. The filters
and the heating radiator (D) change places
correspondingly.
In blocks of flats and terraced houses, the maintenance of the unit is taken
care of by a property maintenance company or the user, depending on the
contract.
Before starting maintenance activities, stop the machine either at the ON/OFF switch or by removing the
fuse from the fuse panel of the dwelling. The safety switch also turns the unit off when the door is opened.
FILTERS
Outdoor air is filtered in the unit with two types of filters. A G3 class coarse filter(A) filters
off insects, heavy pollen and other dust. A F7 class fine filter (B) filtersoff fine, invisible dust.
Extract air is filtered with similar G3 class filters as outsideair.
Clean the coarse filter (A) when needed for example by washing them 2 to 4 times a year
(and more often if needed). Wash a coarse filter with +25…30 °C warm water and washing-
up liquid, pressing it smoothly. Do not handle the filters with force.When washing is done
properly, filters stand cleaning 4…5 times. In otherwords, you have to replace them at least every
two years or when needed.
The fine filter (B) is not washable. Clean it at the same time as the coarse filters,using the
brush nozzle of a vacuum cleaner. When cleaning, be careful no tobreak filter material. To
ensure good supply air quality, replace the filter from every six months toyear (more often if needed)
depending on local air quality. It is recommended to replace filters in autumn. This way the
filters stay cleaner through the winter and can effectivelyfilter off dust in the following spring.
In connection with the cleaning of the filters, it is also advisable to check the cleanliness of
theheat recovery cell (C) every two years or so. Grab the ears at the ends of the cell and
pull thecell out of the unit. If the cell is contaminated, soak it in a solution of water and
washing-upliquid. Rinse the cell clean with a jet of water. When all the water has drained
from betweenthe laminas, push the cell back so that the sealings next to the sliding surfaces
are in place andthe "up" sticker at the end of the cell points to the corner next to the upper
support.
In addition, check in autumn and spring the position of the summer / winter damper and
theleaving of condensing water from the unit as well as the position of the post-heating
radiator thermostat.
Filter guard Vallox 75/95 (option)
VALLOX 75/95 can be equipped with an optional filter guard. The filter guard indicator
lights up at speeds 3 and 4 when the filters are clean; this is normal and does not call for
any maintenance activities. If the indicator does not light up at speed 4, the pressure over
the finefilter differs from the factory setting. When needed, an expert may change the setpoint.
If the filter guard symbol already lights up at fan speed 1 or 2, the filters need cleaning. If they are clean,
the lighting up may be caused by a clogged up dense mosquito net installed against mounting
instructions in the external grille or by the closing of the supply air valves in the rooms.
AB A
Filter guard indicator lamp

VALLOX 75/95
10
MAINTENANCE INSTRUCTIONS
FANS
The supply and extract air fans (D and E) have been fastened with rubber
collars (F). When removing the fans for maintenance, release the ear (K) fixed
to the fan over the rubber collar (F) flange by turning the ear to the upright
position. Lift the rubber collar out of the opening and turn the fan so that it
can be lifted away from the support (M). Remove the plug (G) of the fan.
Cleaning the fans
Clean the fan blades with compressed air or with brush. Each blade has to
be so clean that the fans stay balanced. Take care not to unfasten the balancing
pieces attached to the fan blades.
If you use water in cleaning the unit or its parts, do not let it flow into the electrical parts.
Unfastening and fastening of the self-actuated one-way
damper (vacuum damper)
Y
K
F
B
Y
K
F
C
Y
K
F
A
T
Thermostat sensor has been unlocked. Detach the sensor by turning the collar to
the direction shown by the arrow.
When remounting the sensor, turn the collar to the direction shown by the arrow
to make the claws lock in the open position, check that the green indicator dot is
visible and push the thermostat sensor to attach it to the body of the valve.
Y
F
T
K
Thermostat part and one-way damper in the VKL model
Unfastening and fastening of the thermostat part of the self-actuated valve
A
B
C
Put the hook on the edge of the damper (Y) under the back edge
of the fastening collar (K) of the fan (F) and push the damper
down till the guiding edges of the valve go inside the rubber
collar.
Push the front edge of the collar with your finger.
Put the hook on the front edge of the damper below
the front edge of the collar.
When unfastening the damper, take the same steps in the opposite
order.
Self-actuated one-way dampers are only used in VKL model units.
CONDENSING WATER
During the heating season, humidity of extract air condenses to water. Water
formation may be abundant in new buildings or if ventilation is low compared
to the humidity build-up caused by the residents.
OTHER CLEANING
In connection with maintenance, also check the inner surface of the unit and the condensing
water reservoir. If they are dirty, clean them gently with a damp cloth, brush, vacuum cleaner
or similar. Keep the unit clean to ensure its flawless operation and hygiene.
Condensing water needs to flow out from the ventilation unit without hindrance. In connection
with maintenance, e.g. in autumn before the beginning of the heating season, make sure that
the condensing water outlet in the bottom reservoir is not clogged. You may check it by
pouring a little water in the reservoir.
Do not let water flow into electrical devices.

© VALLOX • We reserve the right to make changes without prior notification.
VALLOX 75/95
11
MAINTENANCE INSTRUCTIONS
Other parts of the ventilation system
Ductwork
In blocks of flats and terraced houses, the housing company takes care
of the maintenance and cleaning of the ductwork in accordance with
the regulations and instructions. In detached houses, the owner takes
care of the cleaning.
Valves
The valves may be gently cleaned on the surface. It is forbidden to
remove the valves and to change their adjustment values. Room dust
may also gather around the supply air filter. The easiest way to remove
it is to vacuum the valve with a brush nozzle. Dirt does not come from
the ductwork with ventilation, but consists of dust in indoor air. This dust
sticks to the ceiling or the wall caused by the flow coming from the
valve.
Cooker hood (connected to the ventilation unit)
The most important object of maintenance is the grease filter. To
ensure sufficient absorption capacity it needs to be cleaned sufficient-
ly frequently, once or twice a month. The filter can usually be cleaned
in a dishwasher for example. It is also important to keep the whole
cooker hood clean. Neglecting the cleaning of the filter reduces the
abatement of fumes and may cause a risk of fire. For more detailed
maintenance instructions for instance on the changing of lamps, see
the instructions of the cooker hood.
Cooker hood (with an integrated fan)
Follow the same instructions as for the cooker hood connected to the
ventilation unit. For special instructions, see the instructions of the
cooker hood.
NOTE! It is absolutely forbidden to flambé under the cooker hood.
VALVE OPERATION
Dusty indoor air sticks to
the ceiling drawn by
clean air.
Clean air

© VALLOX • We reserve the right to make changes without prior notification.
Vallox Oy FIN-32200 Loimaa Finland Telephone [phone] Fax [phone]
www.vallox.com
VALLOX 75/95
TROUBLESHOOTING
2. Other possible disturbances
1. Outdoor air coming to the dwelling is cold.
In case of failure in a block of flats or terraced house, contact the person responsible for maintenance or
a maintenance company.
• Outdoor air fan stops at too high outdoor temperatures.
• Both fans of the VKL model have stopped.
DO THIS
• If the fan keeps stopping at too high outdoor temperatures, check the operation of the defrost thermostat. The function
starts as soon as outdoor temperature goes below -10°C. The threshold is not absolute, but is dependent on the length
of the ductworks, insulation, the speed of the unit and other things.
• If both fans of the VKL model have stopped, the defrost function of water-operated radiator is active.
NOTE! If there is no non-freezing solution in the water of the radiator, the radiator is at risk of freezing and breaking
down. If the radiator breaks down, there is a risk of water damage. Immediately troubleshoot the situation. Check if
the circulation pump is broken, the boiler out of operation, etc. The situation may go return to normal by itself as soon
as supply air temperature rises over 10 °C, but do not wait till it happens.
You can influence the operation of the defrost thermostat as follows:
• If freezing occurs in the cell, you can put the sensor closer to the cell, which makes the fan stop earlier (the cell has to
be thawed out before closing the lid).
• If the fan keeps stopping at too high outdoor temperatures (no humidity, no freezing), you can move the sensor further
away from the cell.
• An expert may also adjust the thermostat in the connection box by turning its spindle clockwise to +10°C or counter-
clockwise to 0°C. At 0°C freezing is unlikely; at 10°C no freezing occurs but extract air can be too warm when going
out. According to the factory setting, the defrost thermostat works at 4°C.
• Air cools down in the attic ducts.
• The heat recovery cell is frozen, which is why extract air cannot heat outdoor air.
• The post-heating radiator does not work.
• The extract air filter or cell is clogged.
• The initial adjustment of ventilation has not been done.
DO THIS
• Measure the temperature of supply air in the unit and compare it with the air coming from the valve. If air cools down
in the duct, check the insulation of the attic ducts.
• If the electric radiator does not heat up, check if the adjustment thermostat is in the desired position. (change the setting
if needed) or if overheat protection has tripped (press the black button at the end of the radiator). If the protector has
tripped, you hear a click when pressing the button. Pressing the button resets the radiator in working order after the
tripping of the overheat protector. Consult an expert to find out why the overheat protector tripped. If the water radiator
of the VKL model does not heat up, there might be many reasons for this: e.g. wrong position of thermostat; water does
not circulate in the radiator; pump may be stopped or some of the valves off; water circulating in the radiator may be
cold, etc. If necessary, consult an expert.
• If a filter or cell is clogged, clean it (see the instructions).
• If the initial adjustment has not been done, have it done.
• If the cell is frozen, check the operation of the defrost thermostat.
1.09.26S/13.02.2007/PDF