14
Vallox
Multi
200
MLV
Vallox
Multi
250
MLV
Air cooling and things to take into
account
Carrying air cooler than the dew point, i.e. cooler than
the surrounding air, in the supply air duct in summer
may cause moistening, or condensation, on the outer
surface of the duct. When the duct is located in roof or
intermediate-floor insulation, the risk of insulation getting
wet around the duct is particularly high.
Only a proper anti-condensation insulation can prevent
condensation in the duct. It can only be implemented
reliably when the supply air duct is situated in a warm
room indoors (e.g. suspended ceiling space).
Thermostat T1 ensures that the duct will not carry too
cold air, which could cause moisture damage. The risk is
small when the heat collection pipes of the heat pump
are situated in the ground or in a water system and the
liquid received from them is warmer in summer than the
liquid circulating in a drilled well.
If the duct is not in an indoor space and insulated
against condensation, the temperature of air travelling
in it must be confined to below the dew point, which
depends on the ambient temperature and relative hu-
midity. In hot weather, supply air temperature should not
go below +16... +20 °C. Supply air temperature must be
monitored at duct thermometer L. The controller of Vallox
Digit SED units also shows the temperature of supply air.
OPERATING INSTRUCTIONS
TECHNICAL DATA
MLV 200
MLV 250
Product codes
Vallox-code
LVI-code
3416800
7912008
3517800
7912032
Outer dimensions Width
Debth
Height
450
420
320
542
590
385
Duct outlet collars
ø 200 mm
ø 250 mm
Filtering
G4
G4
Weight
16 kg
30 kg
Pipe connection
Cu ø 12 mm, 2 pcs
Cu ø 18 mm, 2 pcs
Equipped with
ceiling/wall mounting
plate
ceiling/wall mounting
plate
condensing water outlet,
R 1/2
Vallox Silent Klick
water seal
Condensation must be monitored during the cooling
period. If moisture begins to forms in e.g. the supply air
valve, supply air temperature is too low and must be
raised at thermostat T1.
Operation
Thermostat T3 is used to choose the outdoor air tempe-
rature at which cooling is started. The temperature may
be for instance
12...15 °C, and it can be changed if necessary. Thermos-
tat T3 opens the solenoid valve and starts the pump. The
pump stops and the solenoid valves closes if supply air
temperature goes below the setpoint of thermostat T1.
Boosted cooling in bedrooms
A cooling radiator may also be installed in the supply air
duct leading to bedrooms. In this case all cooling power
can be directed to bedrooms. After the radiator, the duct
has to be unobstructed in the living area and must be
insulated against condensation. If the radiator is used
only for cooling, thermostat T2 is not needed. The ra-
diator for bedrooms can also be an extra radiator. In this
case, anti-condensation insulation is done as explained
in the preheating example. If the radiator is mounted in
the supply air duct, the filter is removed from it.
Outdoor air preheating
The use of ground collector enables the preheating of
outdoor air during the heating season:
• The radiator increases the temperature of outdoor air
coming to the unit, which directly saves energy.
• Preheating lowers or even eliminates the risk of the
heat recovery cell freezing and frosting.
• Observe the frost resistance of the liquid used in the
ground collector (pages 4 and 5).
Operation
The outdoor temperature starting preheating is set at
the thermostat. The value has to be lower than the tem-
perature of the liquid coming from the ground collector.
When this is the case, the liquid helps to heat outdoor
air. Thermostat T2 starts the pump and opens the sole-
noid valve when outdoor air goes below the setpoint of
the thermostat.
OPERATING INSTRUCTIONS
IN ENGLISH
