Drazice OKC 80 Fiche technique

OPERATION AND

INSTALLATION MANUAL

TANK-TYPE WATER HEATERS FOR VERTICAL

MOUNTING

Combined water heather

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

tel.: +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

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

2OPERATION AND FITTING INSTRUCTIONS.................................................................................................8

2.1 OPERATING CONDITIONS .................................................................................................................. 8

2.2 WALL MOUNTING.............................................................................................................................. 8

2.3 PLUMBING FIXTURE........................................................................................................................... 9

2.4 ELECTRIC INSTALLATION.................................................................................................................. 11

2.4.1 ELECTRIC INSTALLATION GENERAL INFORMATION.................................................................11

2.5 CONNECTION OF INDIRECT HEATER TO HOT WATER SYSTEM........................................................ 11

2.6 FIRST HEATER COMMISSIONING ..................................................................................................... 13

2.7 PUTTING OUT OF SERVICE, DISCHARGE .......................................................................................... 13

2.8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE............................................................ 14

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

3OPERATION OF THERMOSTAT................................................................................................................. 16

3.1 SERVICING........................................................................................................................................ 16

3.1.1 OPERATING DEVICES OF THE HEATER ..................................................................................... 16

3.1.2 TEMPERATURE SETTING .......................................................................................................... 16

4IMPORTANT NOTICES .............................................................................................................................. 17

4.1 INSTALLATION REGULATIONS.......................................................................................................... 17

4.2 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 17

5 PRODUCT ACCESSORIES .......................................................................................................................... 18

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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 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.

- 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. 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.

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 5).

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.

- 5 -

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)

ELECTRICICTY

CONSUMPTION FOR

HEATING THE VOLUME

FROM 15°C TO 65°C IN

kWh

OKC 80

2,5

4,8

OKC 100;

OKC 100/1 m295 36

OKC 125;

OKC 125/1 m2120 3,8 8

OKC 160;

OKC 160/1 m2147 5 9,6

OKC 180;

OKC 180/1 m2175 5 10,6

OKC 200;

OKC 200/1 m2195 5,5 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. Thermo wells 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.

- 6 -

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

*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 m2 exchanger.

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

736

881

1046

1235

1187

1287

731

876

1041

1230

1182

1282

615

765 / 636

765/801

1005

793

524

584

501

651 / 701

685

- / 551

- / 831

- / 895

G3/4"

G3/4" / G1"

- / G3/4"

211

211 / 261

245

720 / 815

600

Upper and lower suspension

160,180,200L

4 anchor bolts

Dimensions 450mm and E

Double check before drilling

Upper suspension

and support

80-125L

2 anchor bolts

- 7 -

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

In 1 PE-N 230V/50Hz

INPUT

2000

2200

EL. PROTECTION IP 45

MAX TEMPERATURE

TUV

°C 80

RECOMMENDED TUV

TEMPERATURE

°C 60

HEIGHT OF THE HEATER

736

881

1046

1235

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 2,5 33,8 5 5 5,5

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

RATED THERMAL

OUTPUT AT HEATING

WATER TEMPERATURE

OF 80°C AND FLOW 720

L/H

W 9000 17000 17000 17000 17000 17000

HEATING PERIOD WITH

EXCHANGE FROM 10°C

TO 60°C WITH FLOW 720

l/h

min 32 23 28 35 40 45

RATED THERMAL

OUTPUT AT HEATING

WATER TEMPERATURE

OF 80°C AND FLOW 310

l/h

W 7000 9000 9000 9000 9000 9000

HEATING PERIOD WITH

EXCHANGE FROM 10°C

TO 60°C WITH FLOW 310

l/h

min 50 48 55 75 77 86

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

TIME OF HEATING BY

EXCHANGER FROM 10°C

TO 60°C

min - 14 17 23 26 28

Table 3

- 8 -

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. 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 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 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 3).

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.

- 9 -

Figure 2

2.3 PLUMBING FIXTURE

Connection of heaters to plumbing fixtures is illustrated on (figure 4, 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. 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.

If the water main pressure exceeds such value, a reduction valve must be added to the

- 10 -

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 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. Find

necessary pressure values in the following table. 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.

Required pressures – Table 4.We recommend that the hot water distribution from the heater was as short

as possible to minimise heat losses.

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

Table 4

Heaters must be provided with a discharge valve mounted on the cold service water inlet to the heater

for potential disassembly or repair.

O - Air outlet valve

U – Shut-off valve

P1 - Safety valve with backflow flap

P2 - Safety valve for heating circuit

M - Manometer

Z – Test valve

V - Drain valve

Figure 1

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