Drazice OKC 250 NTR/HP Betriebs- und Installationshandbuch - Seite 12
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2.2 CONNECTING A TANK TO HOT WATER SYSTEM
Figure 5
The output hot water pipe on heaters with a volume of more than 200 litres is fitted with another DN 20
safety valve and opening pressure identical to the maximum operating pressure of the heater tank. This
safety valve does not replace the safety valve on the cold water inlet. No shut-off valve, non-return valve or
filter may be placed between the safety valve and the heater.
T fixtures with discharge valve for potential drain of water from the tank have to be mounted
on the cold water inlet of the tank.
The cold water inlet of each individually closable heater must be fitted with a seal, test tap
or plug to check the non-return valve, as well as a non-return valve and safety valve. Heaters
with a volume of more than 200 litres must also be fitted with a pressure gauge. Each
independently closing tank must be further provided on the hot water inlet with a test valve,
backflow valve, safety valve and manometer.
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