Drazice NADO 500/200v7 Specification sheet

Operation and Installation Manual
Accumulation Tanks
NADO 500/200v7
NADO 750/200v7
NADO 1000/200v7
Družstevní závody Dražice-strojírna s.r.o.
(Works Cooperative - Dražice – Machine Plant, Ltd.)
Dražice 69
294 71 Benátky nad Jizerou
Tel.: [phone], fax: [phone]
www.dzd.cz
[e-mail]

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1. Description
Accumulation 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 tanks allow
combination of connecting even multiple sources.
The NADO type tanks serve accumulation of heat in the heating system and allow heating or
preheating of HSW (Hot Service Water) in an inner tank. Incorporation of an accumulation 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 tank.
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. The tanks are manufactured in 500, 750 and
1000-litre volumes. The 500-litre version is additionally equipped with a tubular exchanger of 2.5m2
surface and the 750 and 1000 litre version with a tubular exchanger of 3.3 m2 surface and two funnels
G1½“ mm, with the possibility to install an electric heating element of TJ 6/4“ series with an extended
cooling compartment, up to 6 kW.
The NADO type enables direct heating of HSW (Hot Service Water) in an inner enamelled tank,
or preheating of water for another water heater. Connection to a boiler usually allows direct HSW
heating in an inner tank 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
reheat the water to the desired temperature, or final electric reheat has to be fitted in the accumulation
tank which is enabled by a TJ 6/4“ series electric heating unit with an extended compartment of up to
6 kW output.
2. 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).
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!!

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3. General dimensions
NADO
500/200 v7
NADO
750/200 v7
NADO
1000/200v7
Tank capacity (l)
500
750
1000
Inner tank capacity (l)
200
200
200
Tank weight (kg)
166
214
228
Tank diameter
600
790
790
Diameter of tank with insulation
800
990
990
Heating surface of the exchanger (m2)
2,5
3,3
3,3
Maximum tank pressure (MPa)
0,3
0,3
0,3
Maximum pressure of the inner accumulator (MPa)
0,6
0,6
0,6
Maximum pressure of exchanger (MPa)
1
1
1
Maximum temperature of water in the tank and
exchanger (°C)
90
90
90
Maximum output of el. heating element of TJ 6/4"
series ( kW)
-
2x6
2x6
Recommendation
It is recommended to use the product in an indoor environment with air temperatures from +5°C to
45°C and a maximum relative humidity up to 80%.
Connection of the inner tank to HSW must comply with ČSN 060830, a safety valve has to be fitted
on the cold water inlet.
We recommend checking and cleaning the inner tank from scale and eventual replacement of the
anode rod after two years of operation. The anode life is theoretically calculated for two years of
operation; however, it changes with water hardness and chemical composition in the place of use.
1. Technical description

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NADO 500 / 200v7
Funnels 6/4“ are fitted only with NADO750,1000/200v7, for the electric heating element of TJ6/4“
series with an extended cooling compartment!!!

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NADO 750 / 200v7, NADO 1000 / 200v7
TYPE
NADO
750/200 v7
NADO
1000/200v7
A
1940
2240
B
1606
1906
C
-
1560
E
-
1406
F
1606
1896

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Thermal insulation
Polyester sheet of 100 mm thickness. It consists
of an upper cover, flange cover and hole caps.
Insulation is supplied in a separate packaging.
We recommend that the insulation was fitted at
room temperature. At temperatures significantly
below 20°C the insulation shrinks. This disables
its easy fitting.
04- 2012