OUMAN EH-800, Руководство пользователя

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32
EH-800 cords with plugs
Meas. 3 and 4
Outdoor temp.
Voltage 24 V
e.g.
Belimo HTC24-SR
max. 24 VDC/3W actuator
Hybrid heating uses two parallel heating systems. The more inexpen-
sive heat source is used as much as possible and the parallel system is
used as needed, for example, during long periods of very low subzero
temperatures when additional heating capacity is needed. Hybrid hea-
ting may use, for example, solar collectors as the primary heat source,
and any traditional heat source, such as oil or electricity, as the secon-
dary heat source (see the diagram).
Hybrid heating uses relative power control, which helps obtain better
efficiency that with cascade control (see p. 31). In hybrid heating cont-
rol, it is also possible to cool the accumulator if it overheats. Cooling
may be necessary, for example, in solar heating if the accumulator is
small and the solar collectors produce too much heat.
Hybrid heating control requires that either EXU-800 extension unit or
EXP-800 expansion package has been connected to the controller. If hy-
brid heating has been selected in the controller, H2 circuit is not avai-
lable.
Hybrid heating
Device settings -> Hybrid heating
Hybrid heating
Not in use
In use
Hybrid heating can not be taken into use if:
1. Cascade control has been taken into use (see Device settings ->
H1 process settings –> Cascade control).
2. H2 circuit is in use (see Device settings -> H2 Process settings).
3. Relay control has been taken into use (See Device settings ->
Relay control).
If “Hybrid heating” is not selectable in device settings, make sure that
cascade control, H2 circuit and relay control are in “Not in use” state.
A diagram illustrating hybrid heating control.
See www.ouman.fi for more diagrams.
Accumulator
temperature
measurement,
e.g. TME
Solar collector temperature measurement
Solar
collector
Supply water sensor
TE5
Power supply from centre
Outdoor temperature sensor
Room temperature sensor
Heating
circuit
EXU-800
TE4
E.g. oil-fired
boiler
Hybrid
accumulator
When hybrid heating is taken into use, the cont-
roller automatically reserves measurements 4 and
5 to hybrid heating use. Accumulator temperatu-
re measurement is connected to measurement
channel 4, and solar collector temperature measu-
rement is connected to measurement channel 5.
Connecting charge pump
actuator and solar collector tem-
perature sensor to EXU-800 ex-
tension unit.
8
(24 VDC OUT)
24 VDC 0 - 10 V
Meas. 5:
Solar
collector
9
(Y)
11
(UI)
Extension unit EXU-800
Meas. 3
Meas. 4:
Accum.
temp.
Wh
Re Bl
Measurements 3 and 4
are connected
using a connecting cord.
RJ45-2 plug
connection