Drazice OKC 250 NTR/HP, OKC 300 NTR/HP, OKC 400 NTR/HP, OKC 750 NTR/HP, OKC 1000 NTR/HP Operating And Installation Manual
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OPERATING and
INSTALLATION MANUAL
INDIRECT WATER HEATER
OKC 250 NTR/HP
OKC 300 NTR/HP
OKC 400 NTR/HP
OKC 500 NTR/HP
OKC 750 NTR/HP
OKC 1000 NTR/HP
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: export@dzd.cz
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CONTENTS
1 TECHNICAL SPECIFICATION OF PRODUCT ................................................................................................. 4
1.1 FUNCTION DESCRIPTION .................................................................................................................. 4
1.2 DESIGN AND GENERAL HEATER DIMENSIONS .................................................................................. 4
1.2.1 PRODUCT DESCRIPTION ............................................................................................................ 4
1.2.2 TECHNICAL DATA ...................................................................................................................... 5
2 OPERATION AND FITTING INSTRUCTIONS .............................................................................................. 12
2.1 PUTTING THE HEATER INTO OPERATION ........................................................................................ 12
2.2 CONNECTING A HEATER TO A HOT WATER DISTRIBUTION ............................................................ 12
2.3 PLUMBING FIXTURE ........................................................................................................................ 13
2.4 CONNECTING A HEATER TO A HEATING SYSTEM ............................................................................ 14
2.5 HEATER CLEANING AND ANODE ROD EXCHANGE .......................................................................... 15
2.6 SPARE PARTS .................................................................................................................................. 15
3 IMPORTANT NOTICES ............................................................................................................................. 15
3.1 IMPORTANT NOTICES ..................................................................................................................... 15
3.2 INSTALLATION REGULATIONS ......................................................................................................... 16
3.3 DISPOSAL OF PACKAGING MATERIAL AND FUNCTIONLESS PRODUCT............................................ 16
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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.
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1 TECHNICAL SPECIFICATION OF PRODUCT
1.1 FUNCTION DESCRIPTION
Indirect stationary heater OKC 250 (300, 400, 500, 750, 1000) NTR / HP is designed for water heating in
conjunction with a heat pump. Reheat can be carried out by the electric heater TJ 6 / 4“.
1.2 DESIGN AND GENERAL HEATER DIMENSIONS
1.2.1 PRODUCT DESCRIPTION
The heater vessel is welded from a steel plate and as a whole is protected by enamel resistant to hot water.
Magnesium anode is added in the vessel as an additional protection against corrosion, which regulates the
electric potential of the inside of the vessel and thus reduces the effects of corrosion. Inside the vessel
there is a welded heat exchanger made of steel pipe with enamelled outer coating, and connections of hot
and cold water, circulation and thermostat tank.
The pipe heat exchanger is only intended for the heating circuit.
On the side of the heater there is a cleaning and inspection aperture ending with a flange of 110 mm
diameter, the pitch of eight M8 bolts is 150 mm. The heater is equipped with a G 1 ½ " aperture for
screwing an additional heater. This option is used, if the heater is connected into the system with a heat
pump, for water reheating at the top of the heater to the desired temperature. The tank is insulated by 50
or 60 mm of polyurethane foam not containing CFCs and the casing of the heater is made of plastic.
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1.2.2 TECHNICAL DATA
Table 1
Typ
OKC 250
NTR/HP
OKC 300
NTR/HP
OKC 400
NTR/HP
OKC 500
NTR/HP
OKC 750
NTR/HP
OKC 1000
NTR/HP
Capacity
l
245
295
356
440
727
945
Height
mm
1541
1580
1591
1921
2050
2083
Diameter
mm
584
670
700
700
990
1090
Maximum weight without
water
kg
119
138
172
203
263
335
Maximum operating
pressure in the tank
MPa 1 1 1 1 1 1
Maximum operating
overpressure in the
exchanger
MPa 1 1 1 1 1 1
Maximum heating water
temperature
°C
110
110
110
110
110
110
Maximum temperature of
HSW (Hot Service Water)
°C
90
90
90
90
90
90
Exchanger heat surface
m2
2,5
3,2 5 6,2
7,0
9,0
Exchanger volume
l
16
24
35
43
49
64
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