Drazice OKCE 100 NTR Fiche technique

OPERATING AND

INSTALLATION MANUAL

STATIONARY STORAGE TANKS

OKCE 100 NTR/2,2 kW

OKCE 125 NTR/2,2 kW

Družstevní závody Dražice - strojírna s.r.o.

Dražice 69, 294 71 Benátky nad Jizerou

tel.: +420 / 326 370 990

fax: +420 / 326 370 980

e-mail: [email protected]

- 2 -

CONTENT

1 TECHNICAL SPECIFICATION OF PRODUCT ................................................................................................. 4

1.1 FUNCTION DESCRIPTION ................................................................................................................... 4

1.2 PRODUCT DESCRIPTION .................................................................................................................... 4

1.3 DESIGN AND GENERAL DIMENSIONS ................................................................................................ 5

1.4 TECHNICAL PARAMETRES.................................................................................................................. 6

2 OPERATION AND FITTING INSTRUCTIONS................................................................................................. 7

2.1 OPERATING CONDITIONS .................................................................................................................. 7

2.2 ELECTRIC INSTALLATION.................................................................................................................... 7

2.2.1 WIRING FOR: OKCE 100 S/2,2 kW, OKCE 125 S/2,2 kW ............................................................ 7

2.3 PLUMBING FIXTURE........................................................................................................................... 8

2.4 PRESSURE LOSSES.............................................................................................................................. 9

2.5 CONNECTION OF STORAGE TANK TO HOT WATER HEATING SYSTEM............................................ 10

2.6 EXAMPLES OF STORAGE TANKS CONNECTION................................................................................ 10

2.7 PUTTING INTO OPERATION ............................................................................................................. 13

2.8 STORAGE TANK CLEANING AND ANODE ROD EXCHANGE .............................................................. 13

2.9 SPARE PARTS.................................................................................................................................... 14

3 OPERATION OF THERMOSTAT................................................................................................................. 14

3.1 SERVICING........................................................................................................................................ 14

3.1.1 OPERATING DEVICES OF THE STORAGE TANK......................................................................... 14

3.1.2 TEMPERATURE SETTING .......................................................................................................... 15

3.2 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 15

4 IMPORTANT NOTICES .............................................................................................................................. 16

4.1 INSTALLATION REGULATIONS.......................................................................................................... 16

4.2 DISPOSAL OF PACKAGING MATERIAL AND FUNCTIONLESS PRODUCT ........................................... 17

- 3 -

Meaning of pictograms used in Manual

Important information for storage tank users.

Recommendations of manufacturer, observance of which will ensure trouble-free

operation and long service life of the product.

CAUTION!

Important nice to be observed.

READ CAREFULLY THE BELOW INSTRUCTIONS PRIOR TO THE INSTALLATION OF

THE STORAGE TANK!

Dear customer,

The Works Cooperative of Dražice - Machine Plant, Ltd., would like

to thank you for your decision to use a product of our brand. With

this guide, we will introduce you to the use, construction,

maintenance and other information on electrical storage tanks.

The manufacturer reserves the right for engineering modification of the product. The product is designed for

permanent contact with drinkable water.

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.

- 4 -

1TECHNICAL SPECIFICATION OF PRODUCT

1.1 FUNCTION DESCRIPTION

Thanks to their construction and number of variants, the OKCE 100, 125 NTR series storage tanks enable

economic preparation of hot service water (HSW) by means of various power sources. Their nominal

performance provides sufficient amount of hot water for flat units, premises, restaurants, and similar

establishments. For HSW reheat, electricity, various types of central heating boilers, recoverable energy

sources (heat pumps, solar collectors) and combination of those can be chosen.

Service water heating via thermal energy through heat exchanger

Closing valves of the heat exchanger must be opened which ensures heating water flow from the hot water

heating system. Together with a closing valve, it is recommended to install an air outlet valve at the inlet to

the heat exchanger in order to bleed the heat exchanger as needed, in particular before the beginning of

the heating season. The time of heating using the heat exchanger depends on the temperature and flow of

water in the hot water heating system.

1.2 PRODUCT DESCRIPTION

The storage tank vessel is welded from a steel sheet; the exchangers from a steel tube and, as a unit, it is

entirely coated with hot water resistant enamel. A flange is welded onto the upper bottom of the

receptacle with a flange lid screwed to it. A sealing ring is inserted between the flange lid and the flange.

Thermowells for placing a heating element and sensors of regulation thermostat and safety fuse are

located in the flange lid. Electric wiring is placed underneath the plastic removable cover. The temperature

of water can be set using the thermostat.

For additional corrosion protection a magnesium anode is mounted in the upper part of the storage tank to

adjust the electric potential inside the tank, reducing the risk of corrosion. The storage tanks have outlets of

hot and cold water and a circulation opening welded to them. The tank is insulated with polyurethane foam

of 40 - 65 mm thickness. The storage tank shell consists of a steel, powder-paint coated, sheet; the

connecting parts are metal coated. The entire storage tank stands on three rectification screws with a

possibility of levelling floor unevenness within the range of 10 mm. The storage tank is to be placed on the

ground. The tank is tested with pressure of 0.9 MPa, heat exchangers with 1.5 MPa.

The NTR version has a heat exchanger located in the bottom part of the storage tank and one heating water

source is used for heating.

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A885 1050

B881 1049

C127 128

D524 524

E182 182

F622 752

L522 622

Type

OKCE 100 NTR/2,2 kW

OKCE 125 NTR/2,2 kW

1.3 DESIGN AND GENERAL DIMENSIONS

OKCE 100 NTR/2,2 kW, OKCE 125 NTR/2,2 kW

Figure 1

①

1" vnější

②

3/4" vnitřní

③

3/4" vnější

④

1/2" vnitřní

Hot utility water

outlet

Cold water inlet

- 6 -

1.4 TECHNICAL PARAMETRES

TYPE

OKCE 100 NTR/2,2kW

OKCE 125 NTR/2,2 kW

CAPACITY [l]

115

WEIGHT[kg]

OPERATING PRESSURE IN THE TANK [MPa]

0,6

OPERATING OVERPRESSURE IN THE

EXCHANGER [MPa]

MAX RATING WATER TEMPERATURE [°C]

110

MAX TEMPERATURE OF HSW [°C]

LOWER EXCHANGER HEAT DELIVERY SURFACE [m2]

1,45

BOTTOM EXCHANGER OUTPUT AT RATING WATER

TEMPERATURE OF 80 °C AND FLOW 720 l/h [kW]

PERMANENT OUTPUT HSW [l/h]

610

990

TIME OF HEATING BY EXCHANGER FROM 10°C TO

60 °C [min]

TIME OF RATING WITH ELECTRICITY FROM 10°C TO

60 °C [h]

3,5

POWER INPUT [kW]

2,2

ELECTRIC CONNECTION OF CONTROL ELEMENTS

1 PE-N 230 V/50 Hz

IP PROTECTION

IP 44

STANDING LOSS [W]

Table 1

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2OPERATION AND FITTING INSTRUCTIONS

2.1 OPERATING CONDITIONS

The tank shall only be used in accordance with the conditions specified on the power plate

and in instructions for electric wiring. Besides legally acknowledged national regulations and

standards, also conditions for connection defined in local electric and water works have to

be adhered to, as well as the installation and operation manual.

The temperature at the place of storage tank installation must be higher than +2°C; and the

room must not freeze. 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.

If water is strongly calcareous we recommend that any of the common decalcifying devices

was installed with the appliance, or that the thermostat was set to the minimum operating

temperature of 60°C (setting to position “60“). For proper operation, drinkable water of

adequate quality shall be used. To avoid potential sediments we recommend that the device

was installed together with a water filter.

2.2 ELECTRIC INSTALLATION

2.2.1 WIRING FOR: OKCE 100 S/2,2 KW, OKCE 125 S/2,2 KW

The electric wiring scheme is attached to the storage tank on the side of the electric installation guard.

Connection, repairs, and wiring inspections may only be implemented by a company (person) authorised to

such activity.

The storage tank is connected to the 230 V/50 Hz electric network using a fixed moving conductor with a

switch that turns off all network poles and the circuit breaker (protector). The degree of protection of

electric parts of the storage tank is IP 44.

Wiring scheme:

Figure 2

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2.3 PLUMBING FIXTURE

Power water connects to pipes with 3/4“ thread in the bottom part of the storage tank. Blue

- cold water supply, red - hot water outlet. For potential disconnection of the storage tank,

the service water inlets and outlets must be provided with screw coupling Js 3/4“. The safety

valve is mounted on the cold water inlet identified with a blue ring.

Each hot service water pressure storage tank must have a safety valve with a membrane

spring. Nominal clearance of safety valves is defined by standard. Storage tanks are not

equipped with a safety valve. The safety valve must be easily accessible, as close to the

storage tank as possible. The inlet pipes must have at least the same clearance as the safety

valve. The 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 storage tank. 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 storage tank pressure and at least 20 % higher

than the maximum pressure in the water main (Table 2). 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 storage tank and the safety valve. During the 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 storage tank shutdown for more than 5

days. Water may be dripping off the drain pipe of the safety valve; the pipe must be open

into the air, pointed down; environment temperatures must not drop below zero. When

draining the storage tank, use the recommended drain valve. First, close the water supply

into the storage tank.

Please find necessary pressure values in the below Table 2. For proper safety valve operation, a backflow

valve must be mounted on the inlets pipes, preventing spontaneous storage tank draining and hot water

penetrating back into the water main. We recommend that the hot water distribution from the storage

tank was as short as possible to minimise heat losses. At least one demountable joint must be mounted

between the tank and every supply pipe.

Adequate piping and fittings with sufficiently dimensioned maximum temperature and pressure values

must be used.

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11,5 235

100

200

Výměník s teplosměnou

plochou 1 m2

Výměník s teplosměnou

plochou 1,45 m2

Průtok topné vody m3/h

Odpor topnévody

mbar

Type

1 2 3 4 5

Exchanger 1 m2 724 51 86 130

Exchanger 1.45 m2

932 68 115 174

Pressure loss mbar

tHV = 60 °C

Amount of heating water in m3/h

Storage tanks must be provided with a discharge

valve mounted on the cold service water inlet to the

storage tank for potential disassembly or repair.

When assembling the security equipment, follow

the standards.

SAFETY VALVE

STARTING

PRESSURE

[MPa]

ADMISSIBLE

OPERATING

STORAGE

TANK

PRESSURE

[MPa]

MAX

PRESSURE IN

THE COLD

WATER PIPE

[MPa]

0,6

up to 0,48

0,7

up to 0,56

up to 0,8

Table 2

2.4 PRESSURE LOSSES

Exchanger with heat

transfer surface 1.45 m2

Exchanger with heat

transfer surface 1 m2

Heating water flow m3/hour

Heating water resistance

mbar

- 10 -

2.5 CONNECTION OF STORAGE TANK TO HOT WATER HEATING

SYSTEM

a) Water heating by electric energy

After the storage tank is connected to electric network, the heating element starts heating water. The

element is turned on and off by a thermostat. After reaching the temperature set, the thermostat switches

off the electric circuit and thus discontinues water heating. The control light signals if the element is in

operation (light is on) or if it is off (the light goes out). In case of longer operation without using the heated

volume, the thermostat has to be set to position 5°C to 8°C (set the “snowflake” symbol on the thermostat

selector) to avoid its freezing, or electricity supply to the storage tank has to be switched off.

In combined versions, the stop valve on the inlet to the exchanger has to be closed, which prevents heating

water in the hot water heating system.

b) Service water heating via thermal energy through heat exchanger

Closing valves of the heat exchanger must be opened which ensures heating water flow from the hot water

heating system. Together with a closing valve, it is recommended to install an air outlet valve at the inlet to

the heat exchanger in order to bleed the heat exchanger as needed, in particular before the beginning of

the heating season (

Figure 4). . The time of heating using the heat exchanger depends on the temperature and flow of water in

the hot water heating system. A storage tank is made in universal design - depending on the need of

connecting the closing valves to the heating element either from the right, or from the left.

It is recommended to install stop valves on the heating water inlet and outlet (for possible

dismantling of the storage tank). The valves have to be as close to the storage tank as

possible to avoid higher thermal losses.

2.6 EXAMPLES OF STORAGE TANKS CONNECTION

Connecting a storage tank to a heating circuit

The storage tank is placed on the ground, next to the heating source, or in its vicinity. The heating circuit is

connected to marked inputs and outputs of the storage tank exchanger; the deaeration valve is mounted in

the highest place. It is necessary to install a filter into the circuit in order to protect the pumps, the three-

way valve, and backflow flaps, and the exchanger from sedimentation. It is recommended to flush the

heating circuit before the assembly. All wiring connections must be properly insulated from heat.

If the system works with priority heating of HSW using a three-way valve, always follow the installation

instructions of the three-way valve’s manufacturer.

Connecting a storage tank to a hot water distribution

Cold water shall be connected to an inlet marked with a blue ring and writing “HSW INLET”. Hot water shall

be connected to an outlet marked with a red ring or writing “HSW OUTLET”. If the hot service water (HSW)

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