VOLTMAX ELECTRIC BOILER Installation and Operation Manual
(
Revised March 2019)
, Page
21.
External alarm contact
An alarm signal (dry contact) is available on the
boiler to advise the user of an alarm situation. The
capacity of the contact is 5A resistive/1A inductive
on terminal
AL/AL
.
The dry contact between contactors AL/AL is
normaly open and will close in the event that any
of the following conditions appears:
•
A temperature high limit
•
A low level of water (if included)
•
Électric power loss or the control switch is
at OFF.
An internal audible alarm inside the controller is
available on all models. Just activate it in the
settings.
Connecting an external high
limit (EXT.HL)
An additional high limit control (pressure,
temperature, flow, water low level…) could be
required in a particular application. It shall be
installed outside of the unit and its contact shall be
connected the EXT. HL contactor of the terminal
bloc after removing the current jumper. This
contact is installed in series with the internal high
limits of the boiler and will stop completetly the
boiler and even engage a lock out if the contact
persists. Consequently, this contact shall not be
used to turn on the boiler. The heat demand or
running authorization should be connected on W1
or W2.
