20
TECHNIC
AL SPECIFIC
ATIONS
Always follow first and foremost the connection diagram
provided by the HVAC designer or heat pump manufacturer.
Also read the duct radiator manual.
The accompanying figure shows an example of the
arrangement for connecting the heating/cooling radiator unit
to the heat collection circuit.
Connect the radiator output pipe to the heat collection
circuit return pipe. Direct the fluid returning from the radiator
unit to the heat collection circuit return pipe. If you know
that there is a large loss of internal pressure inside the heat
pump, the heat pump should be bypassed. If this is done,
the fluid circuit will come into operation when the heat pump
comes to a halt. When this happens the pressure loss in the
one-way bypass valve Y2 must be lower than the pressure
loss in the heat pump.
Heating:
The pump starts when the outdoor air temperature
drops below the winter limit value set at the factory (-5 °C).
Cooling
The supply air setpoint value for the active mode
(for example, At home) controls the pump start-up. The pump
starts when the supply air setting is below the temperature
of the supply air that is blown into the apartment.
The duct radiator can be installed in both the supply air
duct and the outdoor air duct. If the radiator is installed in
the outdoor air duct, it can be used for both preheating and
cooling, or for preheating or cooling alone. If the radiator
is installed in the supply air duct, it can be used only for
preheating or cooling.
The duct radiator can be set to function either automatically
or manually.
• Automatic
- In summer, the supply air temperature will
be maintained at the level specified in the temperature
setting. In winter, the duct radiator will turn on, when the
outdoor temperature falls below the winter setting.
• Manual
- In summer, the duct radiator will turn on,
when the outdoor temperature rises above the summer
setting. In winter, the duct radiator will turn on, when the
outdoor temperature falls below the winter setting.
To prevent the risk of condensation in the supply air
duct, you can set the adjustment of the supply air limit to
automatic or manual.
• Automatic
- The supply air limit is adjusted automatically
based on the dew point of the extract air. When the
supply air temperature falls too low, the duct radiator will
turn off.
• Manual
- The supply air limit can be set manually. When
the supply air temperature falls down to the set value,
the duct radiator will turn off.
If an external sensor is in use, it is selected from the settings
of the external sensor whether it is used to control the
outdoor air duct radiator or the supply air duct radiator.
NOTE:
If the duct
radiator is used in
the supply air duct, it
can only be used for
cooling.
NOTE:
When used to
control the outdoor air
duct radiator, the exter-
nal NTC sensor is ins-
talled in the outdoor air
duct before the radiator.
When used to control
the supply air duct ra-
diator, the external NTC
sensor is installed after
the radiator.
NOTE:
When selecting the
relay (C), take account
of the maximum
allowed combined
power supply (6W) of
the circuit board in the
external MV electrical
box, if the relay power
supply comes from the
circuit board’s +24V
connector.
NOTE:
Due to the risk of humi-
dity damage, in a duct
that has not been insu-
lated for condensation
the supply air tempera-
ture must not fall below
+16 … 20 °C.
DUCT RADIATOR OPERATION
Summary of Contents for Vallox 245 MV VKL
Page 23: ...CONFORMITY CERTIFICATES...
