Drazice NADO v1, Инструкция по эксплуатационной установке

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5. Designing the size and connection of ACCU tank to the heating system
An ideal size of the accumulation tank is designed by a design engineer, or a person sufficiently qualified to design
heating systems.
Product assembly must be implemented by an authorised person (confirmed in the warranty certificate). It is
necessary to activate the heating circuit and remove potential impurities that are captured in the filter; after that
the system is fully functional.
6. General Technical Parameters
The maximum operating pressure in the tank is 0.3 MPa. The maximum heating water temperature in the tank is 90°C.
The maximum operating pressure in the inner tank is 0.6 MPa. The maximum hot service water temperature in the
inner tank is 90°C.
In version 2 a 3 additionally:
The maximum operating pressure in the exchanger is 1 MPa, the maximum temperature of heating water in the
exchanger is 110°C.
Important: When putting into operation, water has to be filled first into the inner tank for HSW
and the operating
pressure inside it has to be kept, only then heating water can be filled into the outer accumulation tank,
otherwise the product may get damaged!
The manufacturer explicitly emphasises the necessity of being particular in testing the tightness of the heating
circuit (radiators, piping joints, floor heating, etc.) with the connection of the accumulation tank. No pressure grow
in the accumulation tank heating water compartment may occur above the maximum operating pressure
of 0.3 MPa, if the heating system is pressurised to higher than the maximum operating pressure, the inner
enamelled tank may get permanently damaged!
No stop fitting can be put between the security fitting of the heating circuit and the accumulation tank!!!
It is recommended that the product is used in an indoor environment with air temperatures from +5°C to 45°C and
a maximum relative humidity up to 80 %.
Safety valve has to be fitted on the cold water inlet. Each hot service water pressure heater must have a safety valve
with a membrane spring. Nominal clearance of safety valves is defined by standard ČSN 06 0830. Heaters are not
equipped with a safety valve. The safety valve must be easily accessible, as close to the heater as possible. The inlet
pipes must have at least the same clearance as the safety valve. Safety valve is placed high enough to secure dripping
water drain by gravity. We recommend mounting the safety valve onto a branch pipe. This allows easier exchange
without having to drain the water from the heater. Safety valves with fixed pressure settings from the manufacturer
are used for the assembly. Starting pressure of a safety valve must be identical to the maximum allowed heater
pressure, and at least 20% higher than the maximum pressure in the water main. If the water main pressure exceeds
such value, a reduction valve must be added to the system. No stop valves can be put between the heater and the
safety valve. During assembly, follow the guide provided by the safety equipment manufacturer. It is necessary to
check the safety valve each time before putting it into operation. It is checked by manual moving of the membrane
from the seat, turning the make-and-break device button always in the direction of the arrow. After being turned, the
button must click back into a notch. Proper function of the make-and-break device results in water draining through
the safety valve outlet pipe. In common operation, such a check needs to be implemented at least once a month, and
after each heater shutdown for more than 5 days. Water may be dripping off the drain pipe of the safety valve; the
pipe must be open into the air, pointed down; environment temperatures must not drop below zero.
When draining the heater, use the recommended drain valve. First, close the water supply into the heater.
Find necessary pressure values in the following table.
For proper safety valve operation, a backflow
valve must be mounted on the inlet pipes,
preventing spontaneous heater draining and hot
water penetrating back into the water main.
Safety valve
starting
pressure (MPa)
Admissible
operating water
heater pressure
(MPa)
Max. pressure in
the cold water
pipe (MPa)
0.6 0.6 do 0.48
0.7 0.7 do 0.56
1 1 do 0.8