VOLTMAX ELECTRIC BOILER Installation and Operation Manual
(
Revised June 2017)
, Page
42.
Pump Configuration Options
On W1 Dem.
Contact of pump 1 is activated
only when there is a demand
on W1.
On W2 Dem.
Contact of pump 2 is activated
only when there is a demand
in W2.
Priority over
P1
When there is a request on
W2, contact of pump 2 is
activated and contact of pump
1 is deactivated.
Always On
The selected pump is always
on (contact is always on).
Stop
The selected pump is always
deactivated (contact is always
off).
Off Delay
The delay in seconds before
the contact of the pump is
deactivated.
4.3.4 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 4.9 .
N.B: It is not recommended to disconnect one of
the power relays to accomplish this function.
4.3.4.1 NONE
The boiler is not limited in power, the maximum
power it can deliver is equivalent to its maximum
rated power.
4.3.4.2 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 4.9.1
4.3.4.3 DCC 0-10 VDC
(Available only on SCR model)
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 4.9.2
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 .
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 gas or oil boiler. In order for the
VOLTMAX controller to be able to record a rise
in temperature caused by the operation of the
auxiliary boiler,
the piping installation must be
carried out in series. The heating return must
first pass through the auxiliary boiler before
entering the boiler.
Back up boiler operation
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