Drazice OKCE 50 Specification sheet

OPERATION AND

INSTALLATION MANUAL

TANK-TYPE WATER HEATERS FOR VERTICAL

MOUNTING

Electric water heaters

OKCE 50

OKCE 80 OKHE 80

OKCE 100 OKHE 100

OKCE 125 OKHE 125

OKCE 160 OKHE 160

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 -

CONTENTS

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

1.2.3 EMERGENCY POWER CONSUMPTION ....................................................................................... 4

1.3 DESIGN AND GENERAL HEATER DIMENSIONS................................................................................... 6

2 OPERATION 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 GENERAL INFORMATION FOR ELECTRIC INSTALLATION ......................................................... 11

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

2.6 FIRST HEATER COMMISSIONING ..................................................................................................... 12

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

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

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

3.1.1 SERVICE HEATER DEVICES........................................................................................................ 16

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

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

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

4.2 DISPOSAL OF PACKAGING MATERIAL AND MALFUNCTIONING 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 -

1TECHNICAL SPECIFICATION OF PRODUCT

1.1 FUNCTION DESCRIPTION

The heater is designed for accumulation heating of service water using electricity. Water is heated by

an electric element in an enamelled thermally insulated tank 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.

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 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.

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TYPE

OKCE

80/

OKCE

100/

OKCE

125/

OKCE

160/

OKCE

180

OKCE

200

OKHE

100

OKHE

125

OKHE

160

CAPACITY

100

125

152/155

180

200

MAX OPERATING

OVERPRESSURE IN

THE TANK

MPa

0.6

MAX OPERATING

OVERPRESSURE IN

EXCHANGER*

MPa

ELECTRIC

CONNECTION

1 PE-N 230V/50Hz

INPUT

2000

2200

EL.PROTECTION

IP 45

MAX HSW

TEMPERATURE

°C

RECOMMENDED

HSW TEMPERATURE

°C

HEIGHT OF THE

HEATER

561

736

881

1046

1235

1187

1287

DIAMETER OF THE

HEATER

524

584

MAX WEIGHT OF

THE HEATER

WITHOUT WATER

36/37

48/49

EL.HEATING TIME

FROM 10°C to 60°C

hour

1.5

2.5

3.8

5.5

Table 1

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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, thermostat

sensors and safety fuses are located in the flange lid. An anode rod is mounted onto the M8 nut. Electric

wiring is placed underneath the plastic removable cover. Description of basic parts of the heater -Figure 1.

Heater dimensions - Figure 2 and Table 2.

Thermometer

heating element well

ceramic heating element 2000W

service thermostat with external control and

safety fuse

electric installation cover

cold water supply pipe

thermowell

hot water withdrawal pipe

Mg anode

10.

enamelled steel receptacle

11.

polyurethane insulation

12.

heater shell

Figure 1

- 7 -

Technical description: OKCE 50 –200, OKHE 80 - 160

Figure 2

OKCE 50

OKCE 80/

OKHE 80

OKCE

100/

OKHE 100

OKCE 125/

OKHE 125

OKCE 160/

OKHE 160

OKCE 180

OKCE 200

572

742/740

887/885

1052/1050

1240/1235

1189

1289

569

742/741

887/886

1054/1051

1237/1236

1178

1280

455

597/581

747/731

762/761

1020/1004

813

798

524

524/516

584

600

14/15

116

116/115

116

Table 2

Upper suspension

and support

50-160L

2 anchor bolts

Upper and lower

suspension 180, 200 I

4 anchor bolts

Dimensions 450mm

and E

Double check before

drilling

- 8 -

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.

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“) - Figure 8. 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 the mounting check the bearing capacity of the wall and the material it is made of,

considering the weight of the heater filled with water. Depending on the wall material

choose adequate fixtures.

Should you have any doubts regarding the wall bearing capacity, consult the suspension with

a building specialist.

The minimum diameter of the bolts for suspending the heater is 12 mm. When mounting

the anchor bolts follow the guide provided by the anchor bolts' manufacturer.

Mount the anchors by the dimensional drawing on Figure 2 in 450 mm spacing. Double check the torque

of the suspension bolts on the heater and suspend the heater. Using the detent support in the bottom part

of the heater make sure it runs in parallel with the wall!

Figure 3

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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 500 mm from the bottom edge of the heater has to be available under

the heater. When mounted directly under the ceiling, the distance from the ceiling has to be

50 mm at least.

If the water heater is mounted in enclosed areas, inter-ceilings, built-in structures and

recesses, ensure sufficient access to service fittings, electrical terminal boards, anodes and

manholes. Minimum spacing from manhole is 600 mm.

2.3 PLUMBING FIXTURE

Power water connects to pipes with ¾“ thread in the bottom part of the heater. Blue - cold

water supply, red –hot water outlet. 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.

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 3). 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.

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.

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Please find necessary pressure values in the below Table 3. For proper safety valve operation, a backflow

valve (Figure 4) must be mounted on the inlet pipes, preventing spontaneous heater draining and hot water

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

SAFETY VALVE

START-UP

PRESSURE

[MPa]

ALLOWABLE

OPERATING

OVERPRESSUR

E OF WATER

HEATER [MPa]

MAXIMUM

PRESSURE IN

COLD WATER

PIPES [MPa]

0.6

up to 0.48

0.7

up to 0.56

up to 0.8

Table 3

Heaters must be provided with a discharge valve

mounted on the cold service water inlet to

the heater for potential disassembly or repair. When

assembling the security equipment, follow

the standard.

Figure 4

This manual suits for next models

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