Drazice NADO 300/20v11 Operating And Installation Manual - Page 4
Browse online or download pdf Operating And Installation Manual for Water Heater Drazice NADO 300/20v11. Drazice NADO 300/20v11 10 pages. Storage tanks
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1 FUNCTION DESCRIPTION
Storage tanks serve accumulation of excessive heat from its source. The source may be a solid fuel boiler,
heat pump, solar collectors, fireplace inserts, etc. Some types of storage tanks allow combination
of connecting even multiple sources.
The NADO type storage tanks serve accumulation of heat in the heating system and allow heating
or preheating of HSW (Hot Service Water) in an inner stainless vessel. Incorporation of a storage tank
in the heating system with a solid fuel boiler allows an ideal run of a boiler at favourable temperature during
the boiler operation. The main benefit lies in the period of optimum operation (i.e. with maximum efficiency)
when the excessive unconsumed heat accumulates in the storage tank.
The storage tanks are manufactured in 300, 400, 750 and 1000-litre volumes. The tanks and tubular
exchangers are made of steel, without the inner surface treatment, the outer surface of the tank is provided
with a protective paint. Individual versions are additionally equipped with a tubular exchanger and a buried
stainless exchanger of 20 and 25 litre volumes, and two funnels G1½" mm, with the possibility
to install an electric heating element of TJ 6/4" series with an extended cooling compartment. The storage
tanks are equipped with a removable 80 mm thick insulation and a lock.
The NADO type enables direct heating of HSW (Hot Service Water) in a stainless exchanger, or its preheating
for another water heater. Connection to a boiler usually allows direct HSW heating in an inner stainless
exchanger to the desired temperature whilst, on the contrary, connection to solar collectors or heat pump
only preheats HSW and another, e.g. electric, heater has to be used, in order to complete heating
of the water to the desired temperature, or final electric reheat has to be fitted in the storage tank which
is enabled by a TJ 6/4" series electric heating unit with an extended compartment of up to 6 kW output.
2 THE DESIGN OF SUITABLE VOLUME AND TANK
INSTALLATION
An ideal size of the storage tank is designed by a design engineer, or a person sufficiently qualified
to design heating systems.
Product assembly must be implemented by an authorized person (confirmed in the warranty certificate).
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 storage tank, otherwise the product may get damaged!
The manufacturer explicitly emphasizes the necessity of being particular in testing the tightness
of the heating circuit (radiators, piping joints, floor heating, etc.) with the connection
of the storage tank. No pressure grow in the storage tank heating water compartment may occur
above the maximum operating pressure of 0.3 MPa, if the heating system is pressurized to
higher than the maximum operating pressure, the inner enameled tank may get permanently
damaged!
No stop fitting can be put between the security fitting of the heating circuit and the storage tank!!!
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