VOLTMAX ELECTRIC BOILER Installation and Operation Manual
(
Revised August 2017)
, Page
33.
4.3.4.4 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 4.9.3 .
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.
4.3.4.5 Schedule
The maximum authorized boiler power can be
programmed according to a schedule. See
section 4.9.4
for an explanation of how to
modify a schedule.
4.3.5
AUXILIARY BOILER
(Available only on SCR model)
The controller program has been designed to
allow the operation of a second boiler or
auxiliary boilier.
4.3.5.1 Select setpoint source for Auxiliary
Boiler
The source of the set-point temperature control
can be configured by selecting
STPT source
Aux.
consequently.
In the
Internal
mode, the terminal contact
Aux
closes when there is a request for W1 or
W2/DHW and the VOLTMAX output temperature
is below the setpoint temperature. In addition,
the Aux contact is opened when the output
temperature is higher than the setpoint
temperature.
In
External
mode, the Aux contact closes when
there is a request on W1 or W2 / DHW
regardless of the boiler output temperature
VOLTMAX. The VOLTMAX boiler thus has no
set temperature and is only used to activate the
auxiliary boiler relay.The various configurations
of the
Aux boiler
mode are the following:
None
No auxiliary boiler is present
Backup
Aux.
This mode allows the adjustment of a
second boiler to play a Backup role
Ext
Contact
Select the heating source using
electrical contact to the
BI-E
terminal.
BiE (BI-
Energy)
Select the heating source using
electrical contact to the BI-E terminal
with the possibility of support
mode of the auxiliary boiler.
Manual
Manually select the system operation
mode (Electrical or Auxiliary).
N.B.
The auxiliary boiler can only be switched on
when a heat demand is present on W1 or / and
W2 / DHW.
4.3.5.2 None
This mode must be active when there is no
auxiliary boiler on the hydronic heating system.
4.3.5.3 Backup Aux.
The boiler will be activated according to the
configuration of the lack of capacity of the
VOLTMAX boiler.
In the event of a lack of capacity, the boiler is
started to compensate.
The lack of capacity is defined by the fact that
the boiler output temperature is less than X
degrees (
Delta T. Start Aux
.) relative to the set-
point for duration of X min. (
Auxiliary Start
Delay
). The auxiliary boiler will be deactivated
when the temperature differential between the
water outlet temperature and the set-point
temperature is lower than
Delta T. Off Aux
.
The
calculation of the delay begins only when the
electric boiler reaches its maximum power (or
maximum power allowed).
The value of "Delta T." should be a negative
value.
Details of the variables in this mode are
presented in
Section 4.10.1