Drazice OKHE ONE/E 30 Fiche technique

OPERATING AND

INSTALLATION MANUAL

FLAT TANK-TYPE WATER HEATER FOR

VERTICAL MOUNTING

Electric water heaters

OKHE ONE/E 30

OKHE ONE/E 50

OKHE ONE/E 80

OKHE ONE/E100

OKHE ONE/E 120

Družstevní závody Dražice-strojírna s.r.o.

Dražice 69, 294 71 Benátky nad Jizerou

tel.: +420 / 326 370 911

fax: +420 / 326 370 980

e-mail: [email protected]

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CONTENTS 
PRODUCT TECHNICAL SPECIFICATION....................................................................................................... 4 
1 FUNCTION DESCRIPTION ................................................................................................................... 4 
2 ADVICE FOR CUSTOMERS.................................................................................................................. 4 
2.1 HOT WATER CONSUMPTION..................................................................................................... 4 
2.2 ENERGY SAVING......................................................................................................................... 4 
2.3 EMERGENCY POWER CONSUMPTION....................................................................................... 4 
3 DESIGN AND GENERAL HEATER DIMENSIONS................................................................................... 6 
OPERATION AND FITTING INSTRUCTIONS................................................................................................. 8 
1 OPERATING CONDITIONS .................................................................................................................. 8 
2 WALL MOUNTING.............................................................................................................................. 8 
3 PLUMBING FIXTURE......................................................................................................................... 10 
4 ELECTRICAL INSTALLATION.............................................................................................................. 12 
4.1 GENERAL INFORMATION FOR ELECTRICAL INSTALLATION ..................................................... 12 
5 OPERATING ACTIVITY ...................................................................................................................... 13 
6 FIRST COMMISSIONING................................................................................................................... 13 
7 PUTTING OUT OF SERVICE, DISCHARGE .......................................................................................... 14 
8 INSPECTION, MAINTENANCE & CARE FOR THE APPLIANCE............................................................ 14 
9 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 16 
OPERATION OF THERMOSTAT................................................................................................................. 17 
1 OPERATING DEVICES OF THE HEATER............................................................................................. 17 
1.1 TEMPERATURE SETTING.......................................................................................................... 17 
IMPORTANT NOTICES.............................................................................................................................. 18 
1 INSTALLATION REGULATIONS.......................................................................................................... 18 
2 TRANSPORT & STORAGE INSTRUCTIONS ........................................................................................ 18 
3 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 19 
PRODUCT ACCESSORIES .......................................................................................................................... 19 
 
 

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CAREFULLY READ THIS MANUAL BEFORE INSTALLING THE WATER HEATER!

Dear Customer,

Družstevní závody Dražice - strojírna s.r.o., 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 enameled thermally insulated tank at the time

defined by the power supplier. At the time of the heating, the element is controlled by thermostat on which

the desired temperature can be set (ranging from 0 °C to 77 °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

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

According to current legislation, the standby consumption is stated in the value of annual

consumption of electric energy (kWh), which is measured according to the corresponding load

profile and calculated according to the formulas and requirements of EU Regulation

No. 812/2013.

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Table 1

TYPE

OKHE

ONE/E 30

OKHE

ONE/E 50

OKHE

ONE/E 80

OKHE

ONE/E 100

OKHE

ONE/E 120

VOLUME

MAX OPERATING

OVERPRESSURE

IN THE TANK

bar

ELECTRICAL CONNECTION

1/N/PE ~ 230V/50Hz

RECOMMENDED BREAKER

10 A

16 A

INPUT

1100

2000

EL. PROTECTION

IP 44

MAX OPERATING

TEMPERATURE OF HOT

WATER (HW)

°C

RECOMMENDED HOT

WATER (HW)

TEMPERATURE

°C

HEIGHT OF THE HEATER

617

845

1112

1327

1552

HEATER DIMENSION

width x depth

523x318

MAX WEIGHT OF THE

HEATER WITHOUT WATER

TIME OF EL. HEATING

FROM 10°C TO 60°C

hours

1,5

2,5

MIXED WATER V40

39.37

72.16

88.77

113.12

118.16

LOAD PROFILE

ENERGY EFFICIENCY CLASS

ENERGY EFFICIENCY

ANNUAL CONSUMPTION

OF ELECTRIC ENERGY

kWh

561

1353

1378

1405

1403

- 6 -

1.3 DESIGN AND GENERAL HEATER DIMENSIONS

The heater tanks are made of a steel plate and tested by 1.5 multiple of operation pressure value. The inside

of the tank is enameled. A flange is welded onto the bottom of the tanks 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 tone flange lid, and the safety fuses and the second flange

lids are without thermowells. 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.

Figure 1

1. Enameled steel receptacle

2. Heater shell

3. Polyurethane insulation

4. The heating element well, ceramic heating unit 2000 W, OKHE ONE/E 30 - 1100 W

5. Thermostat sensor well and temperature indicator

6. Mg anode

7. Filling-in tube

8. Electric installation cover

9. Thermometer

10. Service thermostat with external control and safety fuse

11. Drain tube

- 7 -

OKHE ONE/E 30 - 120

Figure 2

Table 2



3/4" outer

OKHE ONE/E 30

OKHE ONE/E 50

OKHE ONE/E 80

OKHE ONE/E 100

OKHE ONE/E 120

617

845

1112

1327

1552

318

523

500

730

920

1135

1360

350

560

750

950

1150

110

190

110

180

- 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 55 °C (setting to position „OPTIMUM“) - Figure 10. 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 4 bolts for suspending the

heater is 8 mm. When mounting the anchor bolts follow the manual provided by the anchor

bolts' manufacturer.

Thermostat and no other part of the control panel is not a bearing part which can be used for

any handling with 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 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.

- 9 -

Mount the water heater in vertical position. The fixing wood screws must have guaranteed

spacing t=180 mm and spacing F according to the heater volume (Figure 3) or with hinges.

2 upper hinges are attached to the wall and 2 lower hinges are fitted into the bottom holes on

the heater, the lower hinges serve as abutment (Figure 4). Hinges (4 pcs) are included in

package.

Figure 3

Figure 4

The ONE heater can also be installed in a horizontal position. Considering the laws of physics,

its energetic performance drop will always occur due to deteriorated stratification of water.

However, neither lifecycle nor terms of warranty are changed thereby. Our heaters are tested

for operation in the horizontal position. In use in the horizontal position it is recommended that

the user set a temperature higher on the thermostat than factory optimum value.

Recommended value is 65 °C.

Direction of placement - to the left due to the fact the heating flange must be placed in a lowered

reservoir.

When installing in a horizontal position, only two bolts may be used for hanging (upper holes).

OKHE ONE/E 30

350

OKHE ONE/E 50

560

OKHE ONE/E 80

750

OKHE ONE/E 100

950

OKHE ONE/E 120

1150

- 10 -

For proper operation in the horizontal position it is necessary to change the cold water input

for hot water output and vice versa (swap of blue and red ring is recommended as well); at the

same time it is necessary to remove PEX tube from the left (lower in the horizontal position)

mouthpiece.

Figure 5

2.3 PLUMBING FIXTURE

The heater connects to water distribution tubes with G 3/4“ 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.

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 6). 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 table below - 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.

Remove

PEX tube.

Hot water (after swap)

Swap blue and red ring.

Cold water (after swap)

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