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Liquid fuel boiler protection
If liquid boiler temperature drops below the minimum boiler temperature - parameter P5.1,
the mixing valve will gradually begin to close.
In case if liquid boiler temperature exceeds the maximum boiler temperature - parameter
S5.1, boiler protection is activated.
At this point, the maximum boiler temperature - parameters S2.6 and S3.6 is set for the
calculated stand-pipe temperature. The d. h. w. warming pump is also activated. The pro-
tection is deactivated, when boiler temperature drops below the maximum boiler tempera-
ture.
Control of a two-stage burner
To control the two-stage burner, set the parameter S1.11=1. The first stage of the burner is
controlled by relay R1, and the second stage is controlled by relay R0.
The second stage is switched on, when boiler temperature drops 4°C below the switch-on
temperature for the first stage, or if boiler temperature remains below the switch-on tem-
perature for the first stage for more than 15 minutes.
The second stage is switched off when the temperature in the boiler is less than 4°C below
the switch-off temperature for the first stage.
SoLID FUEL BoILER
Solid fuel boiler protection
If solid boiler temperature drops below the minimum temperature - parameter P5.2, the
mixing valve will gradually begin to close. In case if solid boiler temperature exceeds the
optimal operation temperature, the controller proportionally increases the calculated stand-
pipe temperature.
In such way boiler overheating is prevented and the surplus heat is dissipated into the
building.
If solid fuel boiler temperature exceeds the maximum boiler temperature - parameter
S5.13, the mixing valve gradually opens up to the maximum stand-pipe temperature -
parameters S2.6 and S3.6. The protection is deactivated, when boiler temperature drops
below the maximum boiler temperature.
hEAT ACCUMULAToR
If temperature of heat accumulator drops below the set minimum heat accumulator tem-
perature (parameter P5.3), the mixing valve will gradually begin to close. If heat accumula-
tor temperature exceeds the maximum heat accumulator temperature (parameter S5.13),
the heat accumulator overheating protection is activated, which opens the mixing valve
up to the maximum stand-pipe temperature (parameters S2.6 and S3.6). The protection is
deactivated, when heat accumulator temperature drops below the maximum temperature.
Service setting manual
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