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BACKUP BOILER CONECTION
The controller can control the operation of the backup boiler (gas or oil). In this case, it is
not necessary to switch this boiler on or off manually. The backup boiler will be switched
on in case the temperature of the pellet boiler drops below the set temperature in the
service menu. The backup boiler is switched off when the pellet boiler reaches the required
temperature. Connection to a backup - e.g. gas boiler must be performed by a qualified
technician in accordance with the technical documentation of this boiler. The backup
boiler must be connected to terminals 46-47 via a relay.
Example of a system diagram for connecting a backup boiler to the controller, 1 -
controller, 2 - backup boiler (gas or oil), 3 - relays RM 84-2012-35-1006 and base GZT80
RELPOL.
To enable backup boiler control, set H outputs for backup boiler control in the menu:
Service settings ĺ Output H ĺ Backup boiler
ĺ Boiler settings ĺ Replacement boiler
To additionally enable backup boiler control, you must set the Backup boiler shutdown
temperature parameter to a value other than zero. The switch-off of the backup boiler
control follows the setting of the zero value of the switch-off of this parameter.
The control output for the backup boiler is also shared with the alarm
output. Disabling the backup boiler control will cause the output to be
controlled by the alarm module.
If the pellet boiler is in operation and its temperature exceeds the set value - e.g. 25 ° C, the
controller switches off the backup boiler (supply voltage 12V at terminals 46-47). This will
power the relay coil and open the contacts. When the boiler temperature falls below the
set value of the backup boiler switch-off, the controller stops supplying voltage to
terminals 46-47, which switches on the backup boiler.
47


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