Drazice OKHE ONE20 Technisches Datenblatt

OPERATING AND

INSTALLATION MANUAL

FLAT WATER TANK-TYPE WATER HEATER FOR

VERTICAL MOUNTING

Electric water heaters

OKHE ONE20

Družstevní závody Dražice-strojírna s.r.o.

(Works Cooperative - Dražice - Machine Plant, Ltd.)

Dražice 69, 294 71 Benátky nad Jizerou

tel.: +420 / 326 370 911

fax: +420 / 326 370 980

e-mail: expo[email protected]z

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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

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

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

2PERATION AND FITTING INSTRUCTIONS ................................................................................................... 7

2.1 OPERATING CONDITIONS .................................................................................................................. 7

2.2 WALL MOUNTING.............................................................................................................................. 7

2.3 PLUMBING FIXTURES......................................................................................................................... 8

2.4 ELECTRICAL INSTALLATION.............................................................................................................. 10

2.4.1 GENERAL INFORMATION FOR ELECTRICAL INSTALLATION ..................................................... 10

2.5 OPERATION...................................................................................................................................... 10

2.6 FIRST COMMISSIONING................................................................................................................... 11

2.7 PUTTING OUT OF SERVICE, EMPTYING............................................................................................ 11

2.8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE............................................................ 12

2.9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 13

3OPERATION OF THERMOSTAT................................................................................................................. 14

3.1TEMPERATURE SETTING .................................................................................................................. 14

4IMPORTANT NOTICES .............................................................................................................................. 14

4.1 INSTALLATION REGULATIONS.......................................................................................................... 14

4.2 TRANSPORT & STORAGE INSTRUCTIONS ........................................................................................ 15

4.3 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 15

5PRODUCT ACCESSORIES .......................................................................................................................... 15

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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.

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.

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1PRODUCT TECHNICAL SPECIFICATION

1.1 FUNCTION DESCRIPTION

Tank type water heater (the heater hereinafter) is designed for the accumulation heating of service water

by electric energy. Water is heated by an electric element in an enamelled thermally insulated tank.

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. How water drains

off the upper part, and incoming water stays in the bottom part of the heater. The pressure principle allows

hot water withdrawal at any place away 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

The heater is insulated with quality polyurethane Freon free foam. Set 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 body.

1.2.3 EMERGENCY POWER CONSUMPTION

Even if no heated water is withdrawn from the heater, there is some minor leakage of heat.

That 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.

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TYPE OKHE ONE 20

VOLUME L 20

MAX OPERATING

OVERPRESSURE IN THE

TANK

MPa 0.6

ELECTRICAL CONNECTION V 1/N/PE ~ 230V/50Hz

RECOMMENDED BREAKER 10 A

INPUT W 2200

EL. PROTECTION IP 44

MAX OPERATING

TEMPERATURE OF HOT

WATER (HW)

°C 80

RECOMMENDED HOT

WATER (HW)

TEMPERATURE

°C 60

HEIGHT OF THE HEATER mm 591

SIZE OF THE HEATER

width x depth mm 523x301

MAX WEIGHT OF THE

HEATER WITHOUT WATER kg 17

TIME OF EL. HEATING FROM

10°C TO 60°C* hrs 0.5

LOAD PROFILE S

ANNUAL CONSUMPTION

OF ELECTRIC ENERGY kWh 485

MIXED WATER V40 l14.24

ENERGY EFFICIENCY CLASS A

Table 1

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1.3 DESIGN AND GENERAL HEATER DIMENSIONS

The receptacles of the heater tank are made of steel plate and tested by 1.5 MPa multiple of operation

pressure value. The inside of the receptacle is enamelled. In the bottom part of the tank there are wells

for placing the heating, regulation and safety element of the water heater (heating element with right thread

G 5/4“, thermostat sensor and thermal fuses). A thermometer is installed in the top part of the heater that

transmits information on heating the volume of service water. The receptacle of the heater is provided with

a quality polyurethane insulation that ensures minimum heat losses.

Wiring is installed in the bottom part of the heater. Water temperature may be set by a thermostat

in the range from 5 °C to 74 °C. Cold water inlet is marked with a blue circle, hot water is marked with a red

circle. All other steel parts are protected against corrosion by paint and galvanic coating. To ensure protection

against corrosion there is an anode rod installed in the head of the heating element that dissolves during the

operation of the heater and must be replaced after 2 to 3 years of service (depending on the chemical

composition of water).

Dimensions of heaters - Figure 1

Technical description: OKHEONE20

Figure 1

Table 2

OKHE ONE 20

A 591

B 301

D 523

E 345

H 246

K 120

R 180

1/2" outer

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2PERATION AND FITTING INSTRUCTIONS

2.1 OPERATING CONDITIONS

The heater may only be used in accordance with the conditions specified on the nameplate

and the instructions contained in this manual. Besides the legally acknowledged national

regulations and standards, also conditions for the 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 heater has to be mounted at such a place that can be counted

with as handy; it means that the appliance must be easily accessible for possibly necessary

maintenance, repair or replacement, as the case may be.

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 60°C (Figure 6). For proper operation, drinkable water of adequate quality shall

be used.

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.

Neither the control knob of the thermostat, nor another part of the control panel is a bearing

part which may be used for any handling of the heater!

If the hot water heater is mounted in a tight, smaller 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 left available under the heater.

When mounted directly under the ceiling, the distance from the ceiling has to be 100 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.

The heater is mounted in vertical position directly on the wall. Fastening screws must have

guaranteed spacing t = 180 mm.

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180mm

Figure 2

2.3 PLUMBING FIXTURES

The heater connects to water distribution tubes with G1/2“ 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 1/2“.

The safety valve is mounted on the cold water inlet identified with a blue ring.

The heater must be equipped with a membrane, spring-loaded safety valve. Safety valves with

fixed pressure settings from the manufacturer are used for the assembly. Each individually

lockable heater must be fitted with a cap on the cold water inlet, a test valve or a stopper

to check the operation of the check valve, with a check valve and a relief valve (Figure 3).

The safety valve with a check valve is supplied with the heater.

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.

Find necessary pressure values in the below.

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.

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Table 3

Figure 3

Figure 4

SAFETY VALVE

START-UP

PRESSURE [MPa]

ALLOWABLE

OPERATING

OVERPRESSURE

OF WATER HEATER

[MPa]

MAXIMUM

PRESSURE IN COLD

WATER PIPES

[MPa]

0.6 0.6 up to 0.48

0.7 0.7 up to 0.56

11up to 0.8

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2.4 ELECTRICAL INSTALLATION

2.4.1 GENERAL INFORMATION FOR ELECTRICAL INSTALLATION

Execute the connection as indicated in the wiring diagram. Factory connection must not be changed!

The degree of protection of electric parts of the heater is IP 44. Power input of electric element is 2200 W.

Figure 5

It is necessary to observe the below requirements during the electric wiring.

•Heater is connected to 230V/50Hz power supply via a fixed movable cable (depending

on the method of wiring)

•The circuit must contain a breaker disconnecting all poles of the network, and a circuit

breaker (protector).

•Installations in bathrooms, lavatories and showers must comply with the standards

that require that the heater is fitted with a safety terminal for connecting via protective

conductor of yellow-green colour of minimum cross section of 4 mm2.

•Access to the power section of the heater is only possible once the heater is disconnected

from the power supply and the cover of the heater unscrewed.

•Adhere to the protection against electric shock injury according to standard.

2.5 OPERATION

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 thus 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. Setting the thermostat

to the 0 symbol doesn't mean that the appliance has been turned off.

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