VOLTMAX ELECTRIC BOILER Installation and Operation Manual
(
Revised March 2019)
, Page
32.
Outdoor reset
This operating mode makes it possible to
modulate the boiler output set-point temperature
as a function of the outdoor temperature.
The outdoor temperature signal comes from the
temperature sensor supplied with the boiler,
which will be connected to the boiler controller.
The details of the parameters are presented in
Section 4.6.2.
Stop
Select this mode to stop the boiler. The heating
elements will not operate on a W1 demand.
HEATING MODE W2/DHW
This mode allows you to configure a second
heating demand (W2) or a demand from an
indirect domestic water heater (DHW).
Select
none
if none of these functions are used.
These modes are presented in detail in Section
4.7
.
W2
This mode allows the W2-DHW input to be used
to receive a signal (dry contact) from a 2nd stage
of heating.
When the contact on W2-DHW closes, the set-
point temperature changes to the set value (
T.
Set-point W2
), even if there is no demand on W1.
DHW
This mode allows you to configure the demand for
an indirect domestic water heater. When the
DHW mode is selected, the boiler is kept at a
minimum temperature (
T. Min Boiler
) and when
contact W2 closes (Dry contact) the set-point
rises to
T. DHW Set-point
. In addition, the PID
curve is more aggressive.
CAPACITY LIMITING
Adjusting the maximum authorized power
This menu allows you to configure the boiler
output limit. The selection of the limit mode can
be selected in the
Capacity limiting
menu
o
None
o
Manual
o
DDC 0-10 VDC
o
T. Ext
o
Schedule
Details of each of these options are presented in
Section 4.8 .
N.B:
It is not recommended to disconnect one of
the power relays inside the VoltMax boiler to
accomplish this function.
None
The boiler is not limited in power, the maximum
power it can deliver is equivalent to its maximum
rated power.
Manual
The maximum capacity permitted of the boiler is
configured in a fixed mode.
Details of the variables in this mode are
presented in
Section 4.8.1
DCC 0-10 VDC
A 0-10 VDC signal from a building management
system can be used. The signal is treated as a
function in order to limit the maximum power.
In order to configure this mode, you must connect
the 0-10 VDC signal to the terminal block
0-
10Vdc Cap.
and
0-10Vdc G
.
Details of the variables in this mode are
presented in
Section 4.8.2
T. ext
The maximum permitted power can be adjusted
according to the outside temperature sensor. The
outdoor temperature is used in order to limit the
maximum authorized power.
Details of the variables in this mode are
presented in
Section 4.8.3.
This
mode
of
operation
is
particularly
advantageous in applications where the boiler is
connected to an electrical network taking account
of demand peaks in order to determine the cost
of use (demand meter). Since the boiler will thus
be limited to a maximum power which will have to
be established as a function of the heating
requirements of the building and the outside
temperature, it will thus be possible to avoid
peaks of power not required to satisfy the heating
needs in periods of cold weather.
