Drazice Okcv 200 Scheda tecnica

OPERATING AND

INSTALLATION MANUAL

TANK-TYPE WATER HEATERS FOR

HORIZONTAL MOUNTING

4 kW/400 V

OKCV 200 OKCEV 200

Družstevní závody Dražice - strojírna s.r.o.

Dražice 69, 294 71 Benátky nad Jizerou

Phone.: +420 /326 370 990

Fax: +420 / 326 370 980

e-mail: prodej@dzd.cz

- 2 -

CONTENTS

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

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

1.1.1 OPERATING ACTIVITY................................................................................................................. 4

1.2 ADVICE FOR CUSTOMERS .................................................................................................................. 4

1.2.1 HOT WATER CONSUMPTION..................................................................................................... 4

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

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

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

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

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

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

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

2.4 ELECTRICAL INSTALLATION.............................................................................................................. 12

2.4.1 GENERAL INFORMATION FOR ELECTRICAL INSTALLATION ..................................................... 12

2.5 CONNECTION OF INDIRECT HEATER TO HOT WATER SYSTEM........................................................ 12

2.6 FIRST COMMISSIONING................................................................................................................... 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 ACCESSORIES AND SPARE PARTS..................................................................................................... 19

4.3 TRANSPORT & STORAGE INSTRUCTIONS ........................................................................................ 19

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

- 3 -

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.

CAREFULLY READ THIS MANUAL BEFORE INSTALLING THE WATER 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 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. 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.

Made in the Czech Republic.

- 4 -

1PRODUCT TECHNICAL SPECIFICATION

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 the 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).

1.1.1 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 at the inlet to the heat exchanger while heating using el.

energy, 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. Along with a closing valve at the inlet to the heat exchanger, it is recommended to install

an air removal valve, in order to bleed the heat exchanger as needed, in particular before the beginning

of the heating season. The time it takes to heat up using the heat exchanger depends on the temperature

and flow of water in the hot water heating system.

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.

- 5 -

1.2.2 ENERGY SAVING

Hot utility water reservoir is insulated by means of 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 heat exchanger.

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 units [kWh/24h] and indicates

the amount of power needed to maintain the set temperature.

HEATER TYPE NOMINAL CAPACITY (L) TIME OF CONTENT

HEATING (HOURS)

ELECTRICITY

CONSUMPTION FOR

HEATING THE VOLUME

FROM 15oC TO 65oC (kWh)

OKCV 200; OKCEV 200

200

2.9

Table 1

1.3 DESIGN AND GENERAL HEATER DIMENSIONS

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 1.5 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. An anode rod is mounted onto the 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. Heater types OKCV 200 are produced in the right

and left design.

Heater dimensions - Figure 1, Figure 2, Figure 3 and Table 3, Table 4.

- 6 -

* OKCEV series heaters do not include the heat exchanger.

Table 2

TYPE

OKCV 200

OKCEV 200

VOLUME

200

MAX OPERATING OVERPRESSURE

IN THE TANK

MPa 0.6

MAX OPERATING OVERPRESSURE

IN THE EXCHANGER*

MPa 0.4

ELECTRICAL CONNECTION

3 PE-N ~ 400 V/50Hz

INPUT

4000

EL. PROTECTION

IP 42

MAX WARM WATER TEMPERATURE

°C

RECOMMENDED WARM WATER

TEMPERATURE

°C 60

HEIGHT OF THE HEATER mm 1290

DIAMETER OF THE HEATER mm 584

MAX WEIGHT OF THE HEATER

WITHOUT WATER

kg 86/72

TIME OF EL. HEATING FROM 10°C

TO 60°C*

hrs 2.9

LOAD PROFILE

DAILY ELECTRICITY CONSUMPTION

kWh

19.88

MIXED WATER V40

301.93

TYPE

OKCV 200

EXCHANGER HEAT TRANSFER

SURFACE

m20.75

RATED THERMAL OUTPUT AT

HEATING WATER TEMPERATURE OF

W 18000

TIME OF HEATING BY EXCHANGER

FROM 10°C TO 60°C

min 43

RATED THERMAL OUTPUT AT

HEATING WATER TEMPERATURE OF

W 11000

TIME OF HEATING BY EXCHANGER

FROM 10°C TO 60°C

min 72

- 7 -

OKCEV 200

Figure 1

Table 3

TYP OKCEV 200

A 1290

B 600

C 936

D 584

E 258

F 246

G 250

H 618

L 610

①neck 3/4" inner

- 8 -

OKCV 200 – right design

Figure 2

OKCV 200 – left design

Figure 3

Table 4

TYP

OKCV 200

1290

600

936

584

258

246

250

618

670

439

610

①neck 3/4" inner

- 9 -

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 room, in which

the appliance will be operated, must be frost-free. 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 the thermostat to be set to minimum operation

temperature of 60oC. 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. The water heater shall

only be mounted in horizontal position so that the electrical installation cover of the heater was

placed at least 600 mm from the opposite side. 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 the anchoring material. The anchorage system has to be selected individually, depending

on the conditions. We recommend an authorised company perform mounting on the wall and

anchorage, or discuss the anchorage with a 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

- 10 -

2.3 PLUMBING FIXTURE

Connection of heaters to plumbing fixtures is illustrated on (Figure 4, Figure 5).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. We recommend that the hot water distribution from the heater was as short as

possible to minimise heat losses.

Each hot service water pressure heater must have a safety valve with a 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. 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 assembly, follow

the guide provided by the safety equipment manufacturer. The cold water inlet of each

individually closable heater must be fitted with a seal, test tap or plug to check the non-return

valve, as well as a non-return valve and safety valve. Heaters with a volume of more than

200 litres must also be fitted with a pressure gauge.

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 open into 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 shall be mounted on the inlet pipes, preventing spontaneous

heater draining and hot water penetrating back into the water main.

Required pressures: Table 5

Table 5

SAFETY VALVE STARTING

PRESSURE (MPa)

ACCEPTABLE OPERATING OVER-

PRESSURE OF THE WATER

HEATER (MPa)

MAX COLD WATER PRESSURE IN

PIPING (MPa)

0.6

up to 0.48

0.7

up to 0.56

up to 0.8

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