Drazice OKC 80 Specification sheet

OPERATING AND

INSTALLATION MANUAL

Combined water heaters and tanks for vertical assembly

TANK-TYPE WATER HEATER HOT WATER TANKS

OKC 80

OKC 100 OKC 100/1 m2

OKC 125 OKC 125/1 m2

OKC 160 OKC 160/1 m2

OKC 180 OKC 180/1 m2

OKC 200 OKC 200/1 m2

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

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CONTENTS

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

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

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

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

1.2.2 ENERGY SAVING......................................................................................................................... 4

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

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

2OPERATION 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........................................................ 13

2.6 FIRST COMMISSIONING................................................................................................................... 14

2.7 PUTTING OUT OF SERVICE, DISCHARGE .......................................................................................... 15

2.8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE............................................................ 16

2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 17

3OPERATION OF Thermostat..................................................................................................................... 18

3.1 SERVICING........................................................................................................................................ 18

3.1.1 OPERATING DEVICES OF THE HEATER ..................................................................................... 18

3.1.2 TEMPERATURE SETTING .......................................................................................................... 18

4IMPORTANT NOTICES .............................................................................................................................. 19

4.1 INSTALLATION REGULATIONS.......................................................................................................... 19

4.2 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 20

5 PRODUCT ACCESSORIES .......................................................................................................................... 20

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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 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%. 80%.

Product’s reliability and safety is proven by tests implemented by the Engineering Test Institute in Brno.

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1PRODUCT TECHNICAL SPECIFICATION

1.1 FUNCTION DESCRIPTION

The heater is designed for the so-called accumulation heating of service water by electric energy, or by

thermal energy through exchanger. Water is heated by an electric element or heat exchanger in an

enamelled thermally insulated tank at the time specified by the electricity supplier. At the time of the

heating, the element is controlled by thermostat on which the desired temperature can be set (ranging

from 5 and 74℃).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 (Fig. 6).

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 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.

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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.

TANK

HEATER

TYPES

NOMINAL CAPACITY

(L)

HEATING TIME FROM 10°C TO

60°C (hours)

ELECTRICITY

CONSUMPTION FOR

HEATING OF VOLUME

FROM 15

℃

TO 65

℃

kWh)

OKC 80

2,2

4,8

OKC 100;

OKC 100/1

95 2,8 6

OKC 125;

OKC 125/1

120 3,5 8

OKC 160;

OKC 160/1

147 4,3 9,6

OKC 180;

OKC 180/1

175 4,6 10,6

OKC 200;

OKC 200/1

195 5,2 12

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 inside of the tank 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.

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Technical description: OKC 80, OKC 100, OKC 125, OKC 160, OKC 180, OKC 200, OKC 100/1m2, OKC

125/1m2, OKC 160/1m2, OKC 180/1m2, OKC 200/1m2

Figure 1

①

3/4" outer

②

1" outer

③

3/4" inner

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*Distance from the upper heater's edge to the end of the water inlet and outlet tubes. Check the B and N dimensions before

drilling.

The values behind the slash apply to heaters with a 1 m2exchanger.

Table 2

TYPE

OKC 80

OKC 100

OKC 125

OKC 160

OKC 180

OKC 200

OKC 100/1m2

OKC 125/1m2

OKC 160/1m2

OKC 180/1m2

OKC 200/1m2

757

902

1067

1255

1187

1287

748

893

1058

1246

1176

1278

615

765

1001

792

794

524

584

281

193

195

172

498

648

676

208

238

-/438

-/498

-/828

-/886

-/889

450

- 8 -

TYPE

OKC 80 OKC 100 OKC 125 OKC 160 OKC 180 OKC 200

OKC 100/1 m

OKC 125/1 m

OKC 160/1 m

OKC 180/1 m

OKC 200/1 m

VOLUME L 75 95 120 147 175 195

MAX OPERATING

OVERPRESSURE IN THE

TANK

MPa 0,6

MAX MAXIMUM

OPERATING

OVERPRESSURE IN THE

EXCHANGER*

MPa 1

ELECTRICAL

CONNECTION

V 1 PE-N 230V/50Hz

INPUT W 2200 2200

EL. PROTECTION

IP 44

MAX TEMPERATURE OF

HOT WATER

°C 90

MAX OPERATING

TEMPERATURE IN THE

EXCHANGER

°C 110

RECOMMENDED

TEMPERATURE OF HOT

WATER

°C 60

HEIGHT OF THE HEATER

757

902

1067

1255

1187

1287

DIAMETER OF THE

HEATER

mm 524 524 524 524 584 584

MAX WEIGHT OF THE

HEATER WITHOUT

WATER

kg 42 52/58 58/64 66/72 72/77 78/83

TIME OF EL. HEATING

FROM 10°C TO 60°C*

hrs 2,2 2,8 3,5 4,3 4,6 5,2

TYPE

OKC 80 OKC 100 OKC 125 OKC 160 OKC 180 OKC 200

EXCHANGER HEAT

TRANSFER SURFACE

m20,41 0,68 0,68 0,68 0,68 0,68

HEATING TIME BY

EXCHANGER FROM 10°C

TO 60°C AT FLOW 720

l/h

min 32 23 28 35 40 45

RATED THERMAL

OUTPUT AT HEATING

WATER TEMPERATURE

80°C AND FLOW 310 l/h

W 6000 9000 9000 9000 9000 9000

HEATING TIME BY

EXCHANGER FROM 10°C

TO 60°C AT FLOW 310

l/h

min 50 48 55 67 77 86

LOAD PROFILE M M M L XL XL

DAILY ELECTRICITY

CONSUMPTION kWh 6,19 6,31 6,59 12,03 20,11 20,34

MIXED WATER V40 L 138,7 165,41 231,1 242,83 297,01 331,26

TYPE

OKC 100/1m2OKC 125/1m2OKC 160/1m2OKC 180/1m2OKC 200/1m2

EXCHANGER HEAT

TRANSFER SURFACE

m2- 1,08 1,08 1,08 1,08 1,08

RATED OUTPUT AT

HEATING WATER

TEMPERATURE OF 80°C

AND FLOW 720 L/H

W - 24000 24000 24000 24000 24000

HEATING TIME BY

EXCHANGER FROM 10°C

TO 60°C

min - 14 17 21 25 28

STATIC LOSS W - 47 57 67 70 72

Table 3

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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 performance

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 temperature in the heater

installation location must not exceed +2 °C. The appliance has to be mounted at a

convenient place; it means that the appliance must be easily accessible 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 device

was installed with the appliance, or the thermostat to be set to the 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 vertical position so that the lower edge of the heater was

placed at least 600 mm above the floor (Figure 1). In combined heaters, elbows have to be

attached to the heating water inlet and outlet and, by turning them, the mounting either

from the right or from the left has to be determined (Figure 4). 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. We recommend an authorised company

perform mounting on the wall and anchorage, or discuss the anchorage with a professional.

- 10 -

Figure 2

2.3 PLUMBING FIXTURE

Heaters are connected to plumbing fixtures as shown in (Figure 3, Figure 6).

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 a membrane spring.

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.

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