Drazice OKC 250 NTRR Betriebs- und Installationshandbuch - Seite 13
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2.2 EXAMPLES OF HEATERS CONNECTION
2.2.1 CONNECTING A HEATER TO A SOLAR SYSTEM
Heater shall be connected to a solar system by a person familiarised with these heating
systems. Temperatures in a solar circuit may achieve far over 100 °C, and there are
higher pressures than in typical heating systems, therefore correct selection if
interconnecting materials and its coupling is of great importance, as well as correct
dimensioning of the expansion tank connected to this system.
The heater is placed on the ground, next to the heating source, or in its vicinity. The heating circuit is
connected to marked inputs and outputs of the heater exchanger; the deaeration valve designed for solar
system is mounted in the highest place. It is recommended to flush the heating circuit before the assembly.
All wiring connections must be properly insulated from heat.
Connection of heater:
The manufacturer recommends mounting of a mixing valve on the hot water outlet, on
sunny days the temperature in the heater can achieve up to 90 °C which is a
temperature that, in case of scalding, may cause health complications. Output
temperature suitable for common use shall be set on the mixing valve.
Cold water shall be connected to an inlet marked with a blue ring or writing "HSW INLET". Hot water shall
be connected to an outlet marked with a red ring or writing "HSW INLET". If the hot service water (HSW)
distribution is equipped with circulation circuit, it shall be connected to the outlet marked with
"CIRCULATION". For potential drain of heater, the HSW inlet has to be provided with a "T" fixture with a
drain valve. Each individually lockable heater must be at the cold water inlet provided with a stop gate, test
cock, safety valve with a reverse flap and a pressure gauge.
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