Drazice Okce 100 Fiche technique

OPERATING AND

INSTALLATION MANUAL

STATIONARY ELECTRICAL HOT WATER TANKS

OKCE 100 NTR/2,2 kW

OKCE 125 NTR/2,2 kW

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 PRODUCT DESCRIPTION .................................................................................................................... 4

1.3 DESIGN AND BASIC DIMENSIONS OF TANK....................................................................................... 5

1.4 TECHNICAL PARAMETERS.................................................................................................................. 6

2OPERATION AND FITTING INSTRUCTIONS.................................................................................................7

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

2.2 ELECTRICAL INSTALLATION................................................................................................................ 7

2.2.1 ELECTRIC INSTALLATION FOR:OKCE 100 S/2.2 kW; OKCE 125 S/2.2 kW;.................................7

2.3 PLUMBING FIXTURE........................................................................................................................... 8

2.4 PRESSURE LOSSES.............................................................................................................................. 9

2.5 CONNECTION OF INDIRECT TANK TO HOT WATER SYSTEM.............................................................. 9

2.6 EXAMPLES OF tankS CONNECTION.................................................................................................. 10

2.7 FIRST COMMISSIONING................................................................................................................... 12

2.8 CLEANING OF TANK AND EXCHANGE OF ANODE ROD.................................................................... 12

2.9 SPARE PARTS.................................................................................................................................... 13

3OPERATION OF THERMOSTAT................................................................................................................. 13

3.1 SERVICING........................................................................................................................................ 13

3.1.1 OPERATING DEVICES OF THE HEATER ..................................................................................... 13

3.1.2 TEMPERATURE SETTING .......................................................................................................... 13

3.2 MOST FREQUENT FUNCTION FAILURES AND THEIR CAUSES .......................................................... 14

4IMPORTANT NOTICES .............................................................................................................................. 15

4.1 INSTALLATION REGULATIONS.......................................................................................................... 15

4.2 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 16

- 3 -

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.

- 4 -

1PRODUCT TECHNICAL SPECIFICATION

1.1 FUNCTION DESCRIPTION

The construction of the OKC 100,125 NTR series tanks and their variety allow economic preparation of hot

service water (HSW) using different energy sources. Their nominal performance provides sufficient amount

of hot water for flat units, premises, restaurants, and similar establishments. HSW can be heated by electric

energy, different types of central heating boilers, and combinations of those.

Service water heating via thermal energy through heat exchanger

Closing valves of the heat exchanger must be opened which ensures heating water flow from the hot water

heating system. Together with a closing valve, it is recommended to install an air outlet valve at the inlet to

the heat exchanger in order to bleed the heat exchanger as needed, in particular before the beginning of

the heating season. The time it takes to heat up using the heat exchanger depends on the temperature and

flow of water in the hot water heating system.

1.2 PRODUCT DESCRIPTION

The tank receptacle is welded from a steel plate; the exchangers from a steel tube and, as a unit, it is

entirely coated with hot water resistant enamel. A flange is welded onto the upper bottom of the

receptacle 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. Electric wiring is placed underneath the plastic removable cover. The temperature

of water can be set using the thermostat.

For additional corrosion protection a magnesium anode is mounted in the upper part of the tank to adjust

the electric potential inside the receptacle, thus reducing the risk of its corrosion. Tanks have hot and cold

water outlets welded on, and a circulation opening. The tank is insulated with polyurethane foam of 40 -

65 mm thickness. The shell of the tank is steel plate coated with powder dye; connecting pieces are metal

coated. The entire heater stands on three rectification screws with a possibility of levelling floor

unevenness within the range of 10 mm. The heater is to be placed on the ground. The receptacle is tested

with pressure of 0.9 MPa, and exchangers with pressure of 1.5 MPa.

NTR version has one heat exchanger located in the lower part of the tank, and uses one source of heating

water for heating.

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A902 1062

B893 1059

C145 145

D524 524

E195 195

F635 765

L535 635

Typ

OKCE 100 NTR/2,2 kW

OKCE 125 NTR/2,2 kW

1.3 DESIGN AND BASIC DIMENSIONS OF TANK

OKCE 100 NTR/2,2 kW, OKCE 125 NTR/2,2 kW

Figure 1

①1" outer

②3/4" inner

③3/4" outer

④1/2" inner

Cold water inlet

Hot utility water

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1.4 TECHNICAL PARAMETERS

MODEL OKCE 100 NTR/2,2kW OKCE 125 NTR/2,2 kW

Capacity [l] 88 113

Weight without water [kg] 59 71

TANK OPERATING PRESSURE [MPa] 0,6

HEAT EXCHANGER OPERATING PRESSURE [MPa] 1

MAX TEMPERATURE OF HEATING WATER [°C] 110

MAX TEMPERATURE OF HOT WATER [°C] 80

Heating surface of bottom heat exchanger [m2]11,45

BOTTOM HEAT EXCHANGER POWER AT HEATING

WATER TEMPERATURE OF 80

℃

AND FLOW OF 720

l/h [kW]

24 32

PERMANENT HOT WATER POWER [l/h] 610 990

TIME OF HEATING BY EXCHANGER FROM 10°C TO 60

°C [min] 14 14

TIME OF HEATING BY ELECTRICITY FROM 10°C TO 60

°C [h] 33,5

INPUT [kW] 2,2

ELECTRICAL CONNECTION OF CONTROL ELEMENTS 1 PE-N 230 V/50 Hz

ELECTRICAL PROTECTION IP 42

STATIC LOSS [W] 42 54

Table 1

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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 power plate

and in instructions for electric wiring. Besides the legally acknowledged national regulations

and standards, also conditions for connection defined in the local electric and water works

have to be adhered to, as well as the installation and operation manual.

The temperature at the place of the tank 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 “ECO“). 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 ELECTRICAL INSTALLATION

2.2.1 ELECTRIC INSTALLATION FOR:OKCE 100 S/2.2 KW; OKCE 125 S/2.2 KW;

The wiring diagram is attached to the tank on the side of the electric installation guard.

Connection, repairs, and wiring inspections may only be carried out by a company authorised to such

activity.

Expert connection must be confirmed on the warranty certificate.

The tank is connected to the 230 V/50 Hz electrical network using a fixed moving conductor with a switch

that turns off all network poles and the circuit breaker (protector). The degree of protection of electric

parts of the heater is IP 44.

Wiring diagram:

Figure 2

- 8 -

2.3 PLUMBING FIXTURE

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

water supply, red – hot water outlet. For potential disconnection of the tank, the sanitary

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.

Every hot utility water pressure tank shall be equipped with membrane spring loaded with

safety valve. Nominal clearance of safety valves is defined by standard. Safety valve shall be

easily accessible, fitted as close as possible to the tank. 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 that safety valve is mounted on a branch. 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 2). If the water main pressure

exceeds that value, reduction valve must be added to the system. No closing armature may

be mounted between the tank 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

tank, use the recommended drain valve. First of all, close water inlet in the tank.

Find necessary pressure values in the below Table 2. For proper safety valve operation, a backflow valve

shall be mounted on the inlet pipes, preventing spontaneous heater draining of the tank and hot water

penetration 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.

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Type

12 3 4 5

Exchanger 1m2 724 51 86 130

Exchanger 1.45m2 932 68 115 174

Pressure loss mbar

tHV = 60 °C

Amount of heating water m3/h

11,5 235

100

200

Výměník s teplosměnou

plochou 1 m2

Výměník s teplosměnou

plochou 1,45 m2

Průtok topné vody m3/h

Odpor topné vody

mbar

Tanks must be provided with discharge valve

mounted on the cold sanitary water inlet to the tank

for potential disassembly or repair.

When assembling the security equipment, follow

the standard.

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 2

2.4 PRESSURE LOSSES

2.5 CONNECTION OF INDIRECT TANK TO HOT WATER SYSTEM

a) Water heating by electric energy

When the tank is connected to power supply, the heating element heats 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. In combined tanks, the stop valve on the

inlet to the exchanger has to be closed at the inlet to the heat exchanger which prevents heating the water

in the hot water heating system.

Exchanger with heat

transfer surface 1.45 m2

Exchanger with heat

transfer surface 1 m2

Heating water flow m3/hour

Heating water resistance

mbar

- 10 -

b) Service water heating via thermal energy through heat exchanger

Closing valves of the heat exchanger must be opened which ensures heating water flow from the hot water

heating system. Together with the closing valve, it is recommended to install an air outlet valve at the inlet

to the heat exchanger in order to bleed the heat exchanger as needed, in particular before the beginning of

the heating season (Figure 4). The time it takes to heat up using the heat exchanger depends on the

temperature and flow of water in the hot water heating system. A combined heater is made in universal

design – depending on the need of connecting the closing valves to the heating element either from the

right, or from the left.

It is recommended that heating water inlet and outlet are provided with shutoff valves ( in

case the tank has to be demounted). The valves have to be as close to the heater as possible

to avoid higher thermal losses.

2.6 EXAMPLES OF TANKS CONNECTION

Connecting a tank to heating system

The tank is placed on the floor next to the heating source or in its proximity. The heating circuit shall be

connected to marked tank exchanger inputs and outputs, and bleeder valve installed at the highest point. It

is necessary to install a filter into the circuit in order to protect pumps, three-way valve, backflow flaps and

the exchanger from sedimentation. It is recommended to flush the heating circuit before the assembly. All

wiring connections must be properly insulated from heat.

If the system works with priority heating of HSW using a three-way valve, always follow the installation

instructions of the three-way valve’s manufacturer.

Connecting a tank to HSW system

Cold water shall be connected to an inlet marked with a blue ring and writing “HSW INLET”.Hot water is

connected to outlet marked with red circle or inscription "HSW OUTLET". If the hot sanitary water (HSW)

distribution is equipped with circulation circuit, it shall be connected to the outlet marked with

“CIRCULATION”. For potential drain of heater, the HSW inlet has to be provided with a “T” fixture with a

drain valve. Each individually lockable tank must be on the cold water inlet provided with a stop gate, test

tap, safety valve with a reverse flap and a pressure gauge.

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