Drazice NADO 500/300 v1 Specification sheet

OPERATING AND
INSTALLATION MANUAL
STORAGE TANKS
NADO 500/300 v1
NADO 750/250 v1
Družstevní závody Dražice-strojírna s.r.o.
Dražice 69, 294 71 Benátky nad Jizerou
tel.: +420 / 326 370 911
fax: +420 / 326 370 980
e-mail: [email protected]

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CONTENTS
1 FUNCTION DESCRIPTION ........................................................................................................................... 4
2 THE DESIGN OF SUITABLE VOLUME AND TANK INSTALLATION................................................................ 4
3 TECHNICAL PARAMETERS.......................................................................................................................... 5
4 DIMENSIONS AND CONNECTION .............................................................................................................. 6
5 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.............................................. 8

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CAREFULLY READ THIS MANUAL BEFORE INSTALLING THE TANK!
Dear Customer,
Družstevní závody Dražice - strojírna s.r.o., would like to thank you
for your decision to use a product of our brand.
The product is not intended to be controlled by
a) people (including children) with reduced physical, sensual or mental capacities, or
b) people with insufficient knowledge and experiences unless supervised by responsible person,
or unless properly instructed by such responsible person.
The manufacturer reserves the right for engineering modification of the product.
It is recommended to use the product in indoor environment with air temperatures from +2 °C to +45 °C
and a relative humidity up to 80 %.
Product’s reliability and safety is proven by tests implemented by the Engineering Test Institute in Brno.
Made in the Czech Republic.
Meaning of pictograms used in the Manual
Important information for heater users.
Abiding by the recommendations of the manufacturer serves to ensure trouble-free operation
and the long service life of the product.
Caution!
Important notice to be observed.

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1FUNCTION 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 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 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 tanks are made of steel, without any inner surface treatment, the outer surface of the tank is provided
with a protective paint. The tanks are manufactured in 500 and 750 litre volumes. Individual versions
are additionally equipped with an inner accumulator of 300 and 250 litre volumes, and funnels G1½“ mm,
with a possibility to install an electric heating element of TJ 6/4“ series. The 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 an inner accumulator or preheating
of water for another water heater. Connection to a boiler usually allows direct HSW heating in an inner
accumulator to the desired temperature whilst, on the contrary, connection to solar collectors or to a heat
pump only preheats HSW and this tank can be connected to e.g. an electric heater to complete heating
of the water to the desired temperature, or an electric reheat can be fitted in the storage tank which
is enabled by a TJ 6/4“ series electric heating unit. In the standard version, the flange is blinded.
2THE 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 authorised 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 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 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 pressurised to
higher than the maximum operating pressure, the inner enamelled tank may get permanently
damaged!

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The appliance has to be mounted at a convenient place, it means that the appliance must be
easily available for potential necessary maintenance, repair or replacement, as the case may
be.
No stop fitting can be put between the security fitting of the heating circuit and the storage
tank!!!
Connection of the inner tank to HSW must comply with ČSN 06 0830, a safety valve has to be fitted
on the cold water inlet.
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.
3TECHNICAL PARAMETERS
NADO 500/300 v1
NADO 750/250 v1
TANK CAPACITY
l
475
772
INNER TANK CAPACITY
l
279
260
WEIGHT
kg
153
180
MAXIMUM TANK PRESSURE
bar
3
3
MAXIMUM PRESSURE OF THE INNER
ACCUMULATOR
bar
6
6
40°C HOT WATER YIELD AT 53°C WATER
TEMPERATURE IN THE TANK INLET WATER 15°C /
HW FLOW RATE
l/(l/min)
*260 / 10
490 / 10
40°C HOT WATER YIELD AT 80°C WATER
TEMPERATURE IN THE TANK INLET WATER 15°C /
HW FLOW RATE
l/(l/min)
*650 / 10
1170 / 10
MAXIMUM OPERATING TEMPERATURE OF
WATER IN THE TANK
°C
90
90
MAXIMUM OPERATING TEMPERATURE OF
WATER IN THE ACCUMULATOR
°C
90
90
MAXIMUM OUTPUT OF EL. HEATING ELEMENT OF
TJ 6/4" SERIES
kW
1x9 (2x4.5)
3x9
ENERGY EFFICIENCY CLASS
B
C
STATIC LOSS
W
80
117
* value stated by calculation Table 1

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4DIMENSIONS AND CONNECTION
NADO 500/300v1
Figure 1
Table 2

G 1 1/4" inner

G 1/2" inner

G 1" outer

G 3/4" outer

G 1 1/2" inner
B
C
d
E
F
G
H
I
J
L
Lk
245
484
650
1524
584
1036
1690
327
1532
1821
1841

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NADO 750/250v1
Figure 2
Table 3

G 1 1/4" inner

G 1 1/2" inner

G 1" outer

G 3/4" outer
Sensor well
Φ 15x2-150
A
B
C
d
E
F
G
H
I
J
K
L
Lk
M
N
O
P
100
278
625
750
831
1656
278
1914
625
1070
1566
2041
2063
475
535
595
352

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Thermal insulation NEODUL LB PP
Insulation NEODUL of 80 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.
Figure 3
5DISPOSAL OF PACKAGING MATERIAL AND
NON-FUNCTIONING PRODUCT
A service fee for providing return and recovery of packaging material has been
paid for the packaging in which the product was delivered. The service fee was
paid pursuant to Act No 477/2001 Coll., as amended, at EKO-KOM a.s. The client
number of the company is F06020274. Take the water tank packages to a waste
disposal place determined by the municipality. When the operation terminates,
disassemble and transport the discarded and unserviceable heater to a waste
recycling centre (collecting yard), or contact the manufacturer.
14-2-2022