Dettson HYDRAI016-208-3, Инструкция по установке и руководство пользователя, Страница: 9 / 20

to the number of elements programmed in the installer
menu. This function allows the building owner to reduce
his peak consumption. Refer to section 3.7.2 for more
details.
3.5 Low Flow
The boiler will automatically detect a low flow condition
using temperature sensors. It is also possible to connect
a low flow switch to the LF1 and LF2 terminals.
In
this case, a low flow condition would turn off the high
limit contactors, which would de-energize the heating
elements.
3.6 Communication
For installations needing more power, many appliances
can be connected in parallel. A serial communication
allows the different units to exchange operational
information.
There can be up to 255 appliances
connected on the same BUS.
The COM+ and COM- must be connected between
each appliance.
The master appliance will need to
be configured in the installer menu, while the others
must be configured as slaves.
When change in the
configuration is required, only the master appliance need
to be configured, while the others will be automatically
modified.
If an exterior sensor is used, it shall be connected to the
master appliance only.
Figure 3 – Connection of Multiple Boilers
3.7 ELECTRONIC CONTROL
Figure 4 shows how to navigate the various menus.
3.7.1 Display
P
UMP
: State of the pump.
S
ET
P: Temperature
setpoint.
T
ARGET
: Target temperature. This will vary according to
the outdoor temperature (Figure 5).
T°
IN
: Temperature inside the device.
T°
OUT
: Outdoor temperature.
C
MD
: Percentage of power sent to the elements.
From this screen and by pressing the directional buttons,
the user can switch from the various menus available.
3.7.2 Installer
The installer menu’s goal
is to make the technician’s
work easier.
This menu
is protected by a password
that can be found on the
electrical schematic affixed
to the plastic case of the
Hydra.
The password
consists of a combination
of characters entered with
the three buttons of the
Hydra (left,
center, right
then center).
Once the password is confirmed, press the center button
to enter the menu.
The homeowner shouldn’t try to
gain access to this menu as it is used to program the
behaviour of the appliance.
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