Drazice OKCV 180 Technisches Datenblatt

OPERATION AND

INSTALLATION MANUAL

TANK-TYPE WATER HEATERS FOR

HORIZONTAL MOUNTING

4 kW/400 V

OKCV 180 OKCEV 180

OKCV 200 OKCEV 200

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]

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CONTENT

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

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

1.2 ADVICE FOR CUSTOMERS .................................................................................................................. 5

1.2.1 HOT WATER CONSUMPTION..................................................................................................... 5

1.2.2 ENERGY SAVING......................................................................................................................... 5

1.2.3 EMERGENCY POWER CONSUMPTION ....................................................................................... 5

1.3 CONSTRUCTION AND GENERAL HEATER DIMENSION....................................................................... 6

2 OPERATION AND FITTING INSTRUCTIONS................................................................................................. 9

2.1 OPERATING CONDITIONS .................................................................................................................. 9

2.2 WALL MOUNTING.............................................................................................................................. 9

2.3 PLUMBING FIXTURE......................................................................................................................... 10

2.4 ELECTRIC INSTALLATION.................................................................................................................. 12

2.5 CONNECTION OF INDIRECT HEATER TO HOT WATER HEATING SYSTEM........................................ 13

2.6 PUTTING THE HEATER INTO OPERATION ........................................................................................ 14

2.7 PUTTING OUT OF SERVICE, DISCHARGE .......................................................................................... 14

2.8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE ............................................................ 15

2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 16

3 OPERATION OF THERMOSTAT................................................................................................................. 17

3.1 SERVICING........................................................................................................................................ 17

3.1.1 OPERATING DEVICES OF THE HEATER ..................................................................................... 17

3.1.2 TEMPERATURE SETTING .......................................................................................................... 17

4 IMPORTANT NOTICES .............................................................................................................................. 18

4.1 INSTALLATION REGULATIONS.......................................................................................................... 18

4.2 PRODUCT ACCESSORIES AND SPARE PARTS.................................................................................... 18

4.3 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 19

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Meaning of pictograms used in Manual

Important information for heater users

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

operation and long service life of the product.

CAUTION!

Important notice to be observed.

READ CAREFULLY THE BELOW INSTRUCTIONS PRIOR TO THE INSTALLATION

OF THE HEATER!

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

water heaters.

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.

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1TECHNICAL SPECIFICATION OF PRODUCT

1.1 FUNCTION DESCRIPTION

The heater is designed for accumulation heating of service water using electricity or thermal energy via an

exchanger (for the combined design only). Water is heated by an electric element (or a heat exchanger) in

an enamelled thermally insulated accumulator at the time defined by the power supplier. The element is at

the time of heating controlled by a thermostat the temperature of which can be adjusted continuously

(within the range between 5°C and 74°C). Once the selected temperature is reached, heating interrupts

automatically. Water accumulated in the tank is then used for consumption. The tank keeps constant

pressure of water from the water main. If the combination faucet hot water valve is opened, water from

the water supply conduit pressed out by cold water pressure flows out of the heater. Hot water flows out

through the top part, and water flowing in remains in the bottom part of the heater. Pressure principle

allows hot water withdrawal at any place from the heater (Figure 7, Figure 8).

Operating activity:

a) Water heating by electric energy

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

water in the hot water heating system. A combined heater 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.

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1.2 ADVICE FOR CUSTOMERS

1.2.1 HOT WATER CONSUMPTION

Consumption of hot water in households depends on the number of people, amount of

sanitary equipment, length, diameter and insulation of piping in the flat, or on individual

habits of users. The cheapest option of water heating comes at the time when the

electricity rate is reduced.

Find out in what time intervals your electricity supplier provides reduced tariff and,

depending on that information, select relevant volume and power input of the heater so that

your hot water consumption covered the needs of your household.

1.2.2 ENERGY SAVING

Hot utility water reservoir is insulated by means of a top-quality polyurethane foam with

zero CFCs content. Adjust the temperature of the heater's thermostat to that level only that

you need to run your home. Thus you will reduce electricity consumption, as well as the

amount of lime sediments on the walls of the receptacle and on the electric element's pit.

1.2.3 EMERGENCY POWER CONSUMPTION

If no heated water is taken from the tank, a small amount of heat leaks. This loss is

measured for a period of 24 hours at the temperature of 65°C in the heater, and at 20°C in

its ambient area. The resulting value is expressed in kWh/24h and indicates the amount of

power needed to maintain the set temperature (Table 1).

TYPE

CAPACITY (l)

TIME OF HEATING (hrs)

ELECTRICAL

HEATING TIME

FROM

10oC NA 60oC

(kWh)

OKCV 180; OKCEV 180

180

10,

OKCV 200; OKCEV 200

200

5,5

Table 1

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1.3 CONSTRUCTION AND GENERAL HEATER DIMENSION

The heater tank is made of a steel plate and tested by 0.9 MPa overpressure. The heat exchanger is tested

with a pressure of 0.6 MPa. The inside of the receptacle is enamelled. A flange is welded onto the bottom

of the tank 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. Anode rod is mounted on M8 nut. The water reservoir is insulated by means of

polyurethane foam. Electric wiring is placed underneath the plastic removable cover. The temperature of

water can be set using the thermostat. In combined versions, a heat exchanger is welded in the pressure

tank. The heat exchanger is only intended for the heating circuit.

Heaters dimensions - (

Figure 1, Figure 2) a (Table 3, Table 4).

TYPE

OKCV 180

OKCV 200

OKCEV 180

OKCEV 200

CAPACITY

180

200

MAX OPERATING OVERPRESSURE IN THE

TANK

MPa

0.6

MAX OPERATING OVERPRESSURE IN THE

EXCHANGER*

MPa

0.4

ELECTRIC CONNECTION

3 PE-N 400 V/50Hz

POWER INPUT

4000

IP PROTECTION

IP 44

MAX TEMPERATURE OF HSW

°C

RECOMMENDED HSW TEMPERATURE

°C

HEIGHT

1187

1287

DIAMETER

584

MAX WEIGHT WITHOUT WATER

80/69

84/73

TIME OF HEATING WITH ELECTRICITY

FROM 10°C TO 60°C

hrs

2.7

LOAD PROFILE

DAILY CONSUMPTION OF ELECTRICITY

kWh

19.21

19.88

MIXED WATER V40

266.52

301.93

- 7 -

TYPE

OKCV 180

OKCV 200

EXCHANGER HEAT SURFACE

0,75

RATED THERMAL OUTPUT AT HEATING

WATER TEMPERATURE OF 80°C

AND FLOW 720 l/h

18000

TIME OF HEATING BY EXCHANGER

FROM 10°C TO 60°C

min

RATED THERMAL OUTPUT AT HEATING

WATER TEMPERATURE OF 80°C

AND FLOW 310 l/h

11000

TIME OF HEATING BY EXCHANGER

FROM 10°C TO 60°C

min

* The OKCEV series heaters do not have a heat exchanger.

Table 2

OKCV 180, OKCV 200

Figure 1

TYPE

OKCV 180

OKCV 200

1187

1287

600

936

584

258

570

670

256

618

359

246

Table 3

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OKCEV 180, OKCEV 200

Figure 2

TYPE

OKCEV 180

OKCEV 200

1187

1287

600

897

936

584

258

246

252

618

Table 4

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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 heater 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.

We would like to emphasise that the heater must not be connected to power supply if

work involving flammable liquids (petrol, spot remover) or gases, etc., is performed

nearby.

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 60oC (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 WALL MOUNTING

Prior to mounting, check the loading capacity of the wall and, depending on the type of

masonry, choose a suitable anchorage material, or reinforce the wall, if needed. Mount the

water heater only in horizontal position so that, from the front view, the right edge of the

heater was placed at least 600 mm from the opposite wall. In combined and electric

heaters, elbows have to be attached to the hot service water inlet and outlet prior to their

suspension in brackets right under the ceiling and, by turning these elbows, mounting left

has to be determined - either from the right, or from the left. With regard to various types of

carrying masonry and broad assortment of special anchorage material available at the

market, we do not provide heaters with this material. The anchorage system has to be

selected individually, depending on the conditions (Obrázek 3). We recommend an

authorised company perform mounting on the wall and anchorage, or discuss the anchorage

with professional.

If the hot water heater is mounted in a tight, small space, or in an intermediate ceiling, etc.,

you have to make sure that the connecting side of the appliance (connections to water

supply, area for electric plugging) remained accessible and no heat accumulation occurs.

Free space of up to 600 mm from the bottom edge of the heater has to be available under

the heater.

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Obrázek 3

2.3 PLUMBING FIXTURE

For potential disconnection of the heater, 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 heater must have a safety valve with membrane spring.

Nominal clearance of safety valves is defined by standard. 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. 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 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 (Table 5). 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 the assembly, follow the guide provided by the safety equipment manufacturer.

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