Dražice NADO 300/20v6 Instruction Manual

Operation and Installation Manual
Accumulation Tanks
NADO 300/20v6
NADO 500/25v6
NADO 750/35v6
NADO 1000/45v6
Družstevní závody Dražice – strojírna s.r.o. (Works Cooperative - Dražice – Machine Plant, Ltd.)
Dražice 69
29471 Benátky nad Jizerou
Tel.: [phone], fax: [phone]
www.dzd.cz
[email protected]

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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 stainless 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 are manufactured in 300, 500, 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, 25, 35 and 40 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 tanks are equipped with a removable 100 m thick insulation –polyester
foam (Symbio) 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
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).
Notice: When putting into operation, water has to be filled first into the inner stainless HSW
exchanger 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 above the maximum operating pressure of 0.3 MPa in
the accumulation tank heating water compartment may occur, if the heating system is
pressurised to higher than the maximum operating pressure, the inner stainless exchanger 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 Technical Parameters
NADO
300/20v6
NADO
500/25v6
NADO
750/35 v6
NADO
1000/45v6
Tank capacity (l)
300
500
750
1000
Weight (kg)
100
145
176
208
Heating surface of the stainless exchanger (m2)
4,5
6,25
8,5
10
Heating surface of the exchanger (m2)
1,6
2,2
2,2
3,3
Maximum tank pressure (MPa)
0,3
0,3
0,3
0,3
Maximum pressure of stainless exchanger (MPa)
0,6
0,6
0,6
0,6
Maximum pressure of exchanger (MPa)
1
1
1
1
Maximum temperature of water in the tank and exchanger (°C)
90
90
90
90
Amount of hot water at 40°C at water temperature of 53°C in the
tank (l)
210
260
490
750
Amount of hot water at 40°C at water temperature of 80℃in the
tank (l)
520
650
1170
1450
Maximum output of el. heating element of TJ 6/4" series ( kW)
2x4,5
2x6
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.
Prior to commissioning, we recommend that you run the heating circuit and any impurities that are
trapped in the filter clean, then the system is fully operational.
4. Technical description
1Bleeding (heating water outlet)
2Hot water outlet G 1¼“
3Funnel for additional heating element TJ
6/4“ with an extended cooling
compartment 2x
4Funnel for a thermowell 4x G 1/2“
5Funnel for connecting another heating
water source 6x G 1 ¼“
6Inlet into exchanger G 1“ (SOLAR)
7Cold water inlet G 1 ¼“
8Outlet from exchanger G 1“ (SOLAR)
9Funnel for discharge G 1“
10 Steel receptacle
11 Exchanger for connecting solar collectors
(heat pump)
12 Buried stainless exchanger for service
water heating by flow

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NADO 500/25v6, 750/35 v6, 1000/45 v6
Thermal insulation: SYMBIO
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.
TYPE
NADO
500/25v6
NADO
750/35 v6
NADO
1000/45v6
A
1992
2031
2058
B
90
98
90
C
915
882
1035
D
800
950
1000
d1
440
550
600
d2
600
750
850
E
255
255
282

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NADO 300/20v6
Thermal insulation: BALCALDO
10-2012