25
© Vallox Oy - All rights reserved
S
P
V
K
C
IP
B
C
D
E
F
G
H
A
Operation and sample connection
Always follow first and foremost the connection
diagram provided by the HVAC designer or heat pump
manufacturer. Also read the duct radiator manual.
Enclosed is an example of connecting the duct radiator to
the heat collection circuit.
Connect the duct radiator output pipe to the heat collection
circuit return pipe. The fluid returning from the duct radiator
is directed back to the heat collection circuit return pipe.
If the pressure loss inside the heat collection circuit of the
heat pump is known to be high, it is recommended that the
heat pump be bypassed. When this happens the pressure
loss in the one-way bypass valve Y2 must be lower than the
pressure loss in the heat pump.
If the duct radiator is used both for preheating and cooling,
it must be installed in the outdoor air duct before the
ventilation unit. In this case, the pump and the solenoid
valve can be controlled using a Vallox MV ventilation unit,
and no separate thermostats are needed.
NOTE: HEATING
The pump starts
when the outdoor air
temperature drops
below the winter limit
value set at the factory
(-5 °C).
NOTE: COOLING
The value set for the
supply air temperature
of the active profile (e.g.
At home) controls the
startup of the pump.
The pump starts when
the supply air setting is
below the temperature
of the supply air that
is blown into the
apartment.
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.
P
Circulation pump. Not included in the delivery.
The pump must be compatible with the
fluid used in the heat collection circuit, and
its capacity must be correct (for example,
Grundfoss Magna 1 25-80).
V
Solenoid valve. Not included in the delivery. The
valve that is chosen must be compatible with the
heat collection circuit fluid (for example, Danfoss
032U157131, HVAC code 4122106).
K
Condensing water tube. Not included in the
delivery.
L
Supply air thermometer. Not included in the
delivery.
IP
De-aerator. Not included in the delivery.
S
External electrical box for the MV.
C
24 VDC relay/contactor for controlling the pump
and the solenoid valve. Not included in the
delivery. (For example, ABB CR-P024DC2)
Y
One-way valve. Not included in the delivery.
Y2
One-way valve. Not included in the delivery. The
pressure loss must be less than the pressure
loss of the heat pump.
DUCT RADIATOR OPERATION CHART
A
Ventilation unit
B
Supply air
C
Outdoor air
D
Feed from the distribution board
E
Air extraction
F
Duct radiator (reverse connection)
G
Heat pump
H
Heat collection circuit
TECHNIC
AL SPECIFIC
ATIONS
