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8. Return protection
This function permits setting the boiler protection against too cool
water returning from the main circulation, which could cause low-
temperature boiler corrosion. The return protection operates in the way
that when the temperature is too low, the valve is closed, until the short
circulation of the boiler reaches the appropriate temperature. This
function also protects the boiler against dangerously high temperature of
return in order to prevent boiling of water.
9.
Additional sensors
When two mixing valves are used and you select this function you will be
able to select the sensors from which temperature data are to be retrieved for a
valve (for return and outside temperature sensors). Temperatures can be
retrieved from the sensors of the valve being set (Own) or as per the controller
sensors (Main controller).
10.Pump activation temperature
This option is used to set CH and HUW pump activation temperature (this is the
temperature measured on the boiler). Both pumps do not operate below the set
temperature and above this temperature they are activated, but operate
depending on the operation mode (see: pump operation mode).
11. Changing the set valve
This setting is used to set the circuit temperature to be maintained by the
mixing valve. This is the main temperature based on which the room
thermostat reduction function is to be run (see Section III.a.10). The room
thermostat reduction function is set separately for the CH system (setting in the
user menu) and separately for each of the valves.
12. Room temperature difference
This function is active only when the unit is operated with a (standard or TECH)
room thermostat. When the room thermostat reaches the desired temperature
in the house/flat (reports heated up condition), the valve will close to such an
extent so that the temperature downstream of the valve drops by the <room
thermostat reduction> temperature.
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