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16. Boiler Installation
Boilers are typically supplied to customers equipped with basic boiler regulation. The regulation ensures the required heating
water output temperature of 75 to 90° C. It does not cover the control of mixing valves and pumps. Each of the pumps within the
system must be operated by a separate, independent thermostat in order that the reverse operation is not overcooled (i.e. the
reverse temperature should not drop below 60°C). If a boiler is installed without a heat storage unit or without an equalizing
reservoir, any pump located within the heated spaces must be operated (switched on and off) by an independent thermostat or by
means of electronic regulation so that such pump only runs when the boiler circuit's pump is running. If you use two thermostats
(each of them to operate a single pump), then you should set the boiler pump's switch-on temperature to 75 °C and the switch-on
temperature for the heating circuit's pump to 80 °C. At least one pump need to be equipped with filter.
The selection of the required temperature for the water running into the heated building (spaces) is done using a 3 -way of 4-way
mixing valve. The 3-way valve itself does not provide boiler's only-hot-water security. Such mixing valve can either be operated
manually or through an electronic regulating device that will provide a more comfortable and more economic operation of the
boiler. Any related electrical wiring and devices must be done/installed by authorized professional personnel in accordance with
the STN EN standard.
Protecting your boiler from low-temperature corrosion.
The boiler is required to be installed/connected with a Laddomat or thermoregulating valve. This way of connection
provides the thermal separation of the boiler and the heating circuits so that it can ensure a minimum temperature of 60
°C for the return water running back to the boiler. The output water temperature must be kept constant within the range
from 75 to 90 °C. Under normal operating conditions, the temperature of the combustion products must never fall below
the minimum of 110 °C. A low temperature of the combustion products results in the condensation of tars and acids
although the output water temperature is kept within the range of 75 - 90 °C and the return water temperature is kept at
60 degrees centigrade. Such conditions may occur, for instance, during the heating of hot tap water in the summer seasons
or when only a portion of a building is being heated. In such cases we recommend that the boiler be connected with heat
storage units (tanks) or lighting the boiler on a daily basis. The boiler must not be operating for a long time period below
60% of its maximum output capacity.
Boiler Installation/Connection with Laddomat
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