NIBE NADO Storage Tank Instruction Manual

: June 11, 2024
: NIBE

Table of Contents

OPERATIONAL MOUNTING REGULATIONS
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NIBE NADO Storage Tank

OPERATIONAL MOUNTING REGULATIONS

DESCRIPTION

Accumulation tanks serve accumulation of excessive heat from its source. You can use solid fuel boiler, heat pump, solar collectors, fireplace insert, etc. as source. Some sorts tanks allow the combination and connection of more sources.

The NADO type tanks serve only for 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 potential 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, 700 and 1000 litre volumes.
Individual versions are additionally equipped with one or two tubular exchangers, each of 1.4 m2 area and an inspection hole of 182 mm clearance with an option of installation of an in-built electric heating unit TPK.

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 with boiler usually allows direct heating of HSW for required temperature inside the inner tank, but connection to the solar collectors or heat pump only preheats and it is necessary to place another electrical heater, which heats the water onto the requested temperature or to mount additional electrical heater into the accumulation container, which is compatible with electrical heater unit TJ 6/4” or heating flange TPK.

GENERAL DIMENSIONS

Volume [l]	Diameter [mm]	Height [mm]
500	600	1965
750	750	2022
1000	850	2035

DESCRIPTION OF INDIVIDUAL VERSIONS

NADO v1

Accumulation tank with a flange of 210 mm screw spacing. The flange can be used for assembly of an in-built electric heating TPK flange unit. In the standard version, the flange is blinded. Funnel G6/4“ can be used for fitting an electric heating unit TJ G 6/4“ for accumulation tanks NADO 140v1. The tank contains an inner enamelled accumulator of 140 or 200 litres.

NADO v2

Accumulation tank with a flange of 210 mm screw spacing for the assembly of an in-built electric flange heating unit TPK and one exchanger of 1.4 m2 area for connection of an additional heating system (e.g. SOLAR). In the standard version, the flange is blinded. Funnel G6/4“ can be used for fitting an electric heating unit TJ G 6/4“. The tank contains an inner enamelled accumulator of 140 litre capacity.

ILLUSTRATION OF NADO VERSIONS

NADO v1

Outlets:

water inlet to accu tank Inner GS/4″
HSW accumulator inlet and outlet outer G3/4″
hot water accumulator a outlet (bleeding) outer G1″
next inlet inner G5/4″
water inlet to accu tank (drain) outer G1″
thermowells (thermometer, thermostat) inner G1/2″
water outlet from accu tank (return water) inner G5/4″
Hanger, right 210 for assembly of TPK

NADO v2

Outlets:

water inlet to accu tank inner G5/4″
HSW accumulator inlet and outlet outer G3/4″
hot water accumulator aoutlet (bleeding) outer G1″
next inlet inner G5/4″
water Inlet to accu tank (drain) outer G1″
thermowells (thermometer, thermostat) inner G1/2″
water outlet from accu tank (return water) inner G5/4″
Hanger, right 210 for assembly of TPK separated heating system – solar,heat pump
heating water inlet outer G1″
hot water inlet outer G1″
inlet for electric heating T J inner G1 1/2

NADO v2 with inner vessel 140 l

Outlets:

water inlet to accu tank inner GS/4″
HSW accumulator inlet and outlet outer G3/4″
hot water accumulator aoutlet {bleeding) outer G1″
next inlet inner GS/4″
water inlet to accu tank (drain) outer G1 “
thermowells (thermometer, thermostat) inner G1/2″
water outlet from accu tank (return water) inner GS/4″
flanger, right 210 for assembly of TPK separated heating system – solar,heat pump
heating water inlet outer G1″
hot water inlet outer G 1″
inlet for electric heating T J inner G1 1/2″

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). 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.

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 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 openinto 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.

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.

We recommend that the hot water distribution from the heater was as short as possible to minimise heat losses.

Heaters must be provided with a discharge valve mounted on the cold service water inlet to the heater for potential disassembly or repair.

When assembling the security equipment, follow CSN 06 0830.

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.

We recommend checking and cleaning the 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.

Heat insulation

It is necessary to order the NEODUL isolation with 80 mm thickness together with the tank. 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.