Drazice OKH 100 NTR/HV Hoja de especificaciones

OPERATING AND

INSTALLATION MANUAL

INDIRECT HOT WATER TANKS

OKH 100 NTR/HV OKH 100 NTR

OKH 125 NTR/HV OKH 125 NTR

OKH 160 NTR

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 ADVICE FOR CUSTOMERS .................................................................................................................. 4

1.2.1 HOT WATER CONSUMPTION ..................................................................................................... 4

1.2.2 ENERGY SAVING......................................................................................................................... 4

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

2OPERATION AND FITTING INSTRUCTIONS.................................................................................................9

2.1 OPERATING CONDITIONS .................................................................................................................. 9

2.2 PLUMBING FIXTURE........................................................................................................................... 9

2.3 ELECTRICAL INSTALLATION.............................................................................................................. 11

2.3.1 GENERAL INFORMATION FOR ELECTRICAL INSTALLATION ..................................................... 11

2.3.2 ELECTRONIC THERMOSTAT WIRING METHODS ...................................................................... 11

2.4 CONNECTION OF INDIRECT TANK TO HOT WATER SYSTEM............................................................ 12

2.5 FIRST COMMISSIONING................................................................................................................... 13

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

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

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

3OPERATION OF THERMOSTAT ................................................................................................................. 15

3.1 SERVICING........................................................................................................................................ 15

3.1.1 OPERATING DEVICES OF THE TANK ......................................................................................... 15

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

4IMPORTANT NOTICES .............................................................................................................................. 16

4.1 INSTALLATION REGULATIONS.......................................................................................................... 16

4.2 SPARE PARTS.................................................................................................................................... 17

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

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Meaning of pictograms used in the Manual

Important information for tank 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.

PRIOR TO THE INSTALLATION OF THE TANK, READ CAREFULLY THIS

MANUAL!

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. The present instructions will introduce you to the use,

construction, maintenance and other information regarding

electrical water tanks.

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.

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1PRODUCT TECHNICAL SPECIFICATION

1.1 FUNCTION DESCRIPTION

Indirect stationary NTR and NTR/HV series tanks are used to prepare HSW in combination with another hot

water supply, mostly gas boiler. Their rated power output guarantee sufficient amount of HSW even for

large dwelling units - premises, restaurants and similar facilities. In case of higher HSW consumption tanks

heat water continuously and operate in a manner that is similar to that of instantaneous tanks.

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.

1.2.2 ENERGY SAVING

Hot utility water reservoir is insulated by means of top-quality polyurethane foam with zero

CFCs content.

Set the temperature on the tank thermostat to that you need for the operation of your

household. 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.

Benefits of using indirect tank:

-Easy installation and connection to hot water supply,

-Very fast hot utility water heating,

-Enamelled steel tank ensures compliance with all hygienic requirements for the

quality of HSW,

-Integrated protective magnesium anode increases corrosion resistance,

-Quality polyurethane insulation ensures minimum heat losses,

-Smoothly settable HSW temperature up to 74°C,

-multiple supply points,

-Light indication of tank's run,

-Accurate HSW temperature control,

-Possibility of connecting HSW circulation.

- 5 -

1.3 DESIGN AND BASIC DIMENSIONS OF TANK

The tank receptacle is made of steel plate and tested at 0.9 MPa of overpressure. The inside of the

receptacle is enamelled. A flange is welded onto the lower bottom of the receptacle with a flange lid

screwed onto it. A sealing ring is inserted between the flange lid and the flange. Thermowells for

thermostat sensors and thermometer installation are placed 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. Heat

exchanger is welded in pressure receptacle.

Technical description: OKH 100 NTR, OKH 125 NTR, OKH 160 NTR

Figure 1

Technical description: OKH 100 NTR/HV, OKH 125 NTR/HV

Figure 2

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Dimensions of tanks

OKH 100 NTR, OKH 125 NTR, OKH 160 NTR

Figure 3

neck # 1

1" outer

neck # 2

3/4" inner

neck # 3

3/4" outer

neck # 4

1/2" inner

A [mm]

B [mm]

C[mm]

D[mm]

E[mm]

F[mm]

L[mm]

OKH 100 NTR

885

882

129

520

182

622

522

OKH 125 NTR

1050

1047

129

520

182

752

622

OKH 160 NTR

1235

1233

129

520

182

752

882

- 7 -

OKH 100 NTR/HV, OKH 125 NTR/HV

Figure 4

neck # 1

3/4" outer

neck # 2

3/4" outer

neck # 3

3/4" outer

neck # 4

3/4" outer

neck # 5

3/4" outer

neck # 6

1/2" inner

A [mm]

B [mm]

C[mm]

D[mm]

E[mm]

F[mm]

G[mm]

OKH 100 NTR/HV

885

882

127

520

165

119

182

OKH 125 NTR/HV

1050

1047

127

520

165

119

182

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TECHNICAL DATA

Table 1

TYPE

OKH 100

NTR

OKH 125

NTR

OKH 160

NTR

OKH 100

NTR/HV

OKH 125

NTR/HV

VOLUME

120

160

120

MAX WEIGHT OF THE

TANK WITHOUT

WATER

kg 57 71 78 56 70

EXCHANGER HEAT

TRANSFER SURFACE m21,08 1,45 1,45 1,08 1,45

MAXIMUM PRESSURE

OF THE RECEPTACLE MPa 0,6

MAXIMUM PRESSURE

OF THE EXCHANGER MPa 1

MAXIMUM HSW

TEMPERATURE °C 80

RECOMMENDED HSW

TEMPERATURE °C 60

HSW CONNECTION

G ¾“

HEATING WATER

CONNECTION G 1“ G 1“ G 1“ G ¾“ G ¾“

ELECTRICAL

PROTECTION IP42

CONNECTING

VOLTAGE 1 PEN AC 230V. 50 Hz

RATED THERMAL

OUTPUT AT HEATING

WATER

TEMPERATURE 80°C

AND FLOW 720 l/h

W 24000 32000 32000 24000 32000

TIME OF HEATING BY

EXCHANGER FROM

10°C TO 60°C

min 14 14 17 14 14

STATIC LOSS

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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 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. 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 emphasize that the tank shall not be connected to power supply if flammable liquids

(benzine, stain cleaner) or gases, etc., are handled in its proximity.

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. For proper operation, drinkable water of adequate quality shall be

used. To avoid potential deposits we recommend that water filter is connected in series with

the tank.

2.2 PLUMBING FIXTURE

Tanks are connected to plumbing fixtures as shown in Figure 5. For potential disconnection

of the tank, utility water inlets and outlets must be provided with Js 3/4“ screw coupling. If

the hot utility water (HSW) distribution is equipped with circulation circuit, the reverse pipe

is connected to the inlet identified as CIRCULATION. The 100, 125, 160 NTR and 100, 125

NTR / HV types are equipped with a discharge outlet. The tank shall be equipped with safety

valve to ensure operation. 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. Safety valve shall be easily accessible, fitted as close as possible to the tank.

Supply piping shall have minimum inside diameter identical with that of safety valve. Safety

valve is placed high enough to secure dripping water drain by gravity. We recommend

mounting the safety valve onto a branch pipe. Easier exchange without the necessity of

draining water from the tank. Safety valves with fixed pressure settings from the

manufacturer are used for the assembly. The starting pressure of the safety valve must be

identical to the maximum allowed pressure of the tank, and at least 20 % higher than is the

maximum pressure in the water main (Table 2). If the water main pressure exceeds such

value, a 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.

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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 regular operation, such a check needs to be carried

out at least once a month, and after each shutdown of the tank longer 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 following table. 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.

Required pressures - Table 2 - We recommend that the hot water distribution from the tank is as short as

possible in order to reduce heat losses

Table 2

Connection of tank exchanger (left, right) and fixture armature at cold water inlet.

Figure 5

SAFETY VALVE STARTING

PRESSURE (MPa)

ACCEPTABLE OPERATING OVER-

PRESSURE OF THE TANK (MPa)

MAX COLD WATER

PRESSURE IN PIPING

(MPa)

0,6

up to 0.48

0,7

up to 0.56

up to 0.8

O - bleeder valve

U - shutoff valve

P1 - Safety valve with backflow flap

P2 - safety valve for heating circuit

M - Manometer

Z – Test valve

V - Drain valve

Connection on cold water inlet must comply with the

standard effective in the country of installation.

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