Drazice OKC 300 NTR/BP, OKC 750 NTR/BP, OKC 750 NTRR/BP, OKC 250 NTR/BP, OKC 400 NTR/BP Operating And Installation Manual
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OPERATING AND
INSTALLATION MANUAL
STATIONARY HOT WATER TANKS
OKC 160 NTR/BP OKC 300 NTR/BP OKC 750 NTR/BP
OKC 200 NTR/BP OKC 300 NTRR/BP OKC 750 NTRR/BP
OKC 250 NTR/BP OKC 400 NTR/BP OKC 1000 NTR/BP
OKC 200 NTRR/BP OKC 400 NTRR/BP OKC 1000 NTRR/BP
OKC 250 NTRR/BP OKC 500 NTR/BP
OKC 500 NTRR/BP
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
1 PRODUCT TECHNICAL SPECIFICATION ....................................................................................................... 4
1.1 FUNCTION DESCRIPTION ................................................................................................................... 4
1.2 OPERATING AND INSTALLATION MANUAL FOR TYPES: OKC 160 NTR/BP, OKC 200 NTR/BP, OKC
250 NTR/BP, OKC 200 NTRR / BP, OKC 250 NTRR / BP ................................................................................ 4
1.2.1 PRODUCT DESCRIPTION............................................................................................................. 4
1.2.2 CONSTRUCTION AND BASIC DIMENSIONS OF TANK ................................................................. 5
1.2.3 TECHNICAL PARAMETERS .......................................................................................................... 7
1.3 OPERATING AND INSTALLATION MANUAL FOR TYPES: OKC 300 NTR / BP, OKC 400 NTR / BP, OKC
500 NTR / BP, OKC 300 NTRR / BP, OKC 400 NTRR / BP, OKC 500 NTRR / BP ............................................ 8
1.3.1 PRODUCT DESCRIPTION............................................................................................................. 8
1.3.2 DESIGN AND BASIC DIMENSIONS OF TANK ............................................................................... 9
1.3.3 TECHNICAL PARAMETERS ........................................................................................................ 11
1.4 OPERATING AND INSTALLATION MANUAL FOR TYPES: OKC 750 NTR / BP, OKC 1000 NTR / BP, OKC
750 NTRR / BP, OKC 1000 NTRR / BP ......................................................................................................... 12
1.4.1 PRODUCT DESCRIPTION........................................................................................................... 12
1.4.2 DESIGN AND BASIC DIMENSIONS OF TANK ............................................................................. 13
1.4.3 TECHNICAL PARAMETERS ........................................................................................................ 15
2 OPERATION AND FITTING INSTRUCTIONS ............................................................................................... 16
2.1 OPERATING CONDITIONS ................................................................................................................ 16
2.2 ELECTRICAL INSTALLATION .............................................................................................................. 16
2.2.1 TECHNICAL PARAMETERS OF ELECTRIC HEATING UNITS ........................................................ 17
2.2.2 HEATING UNIT - FLANGES ........................................................................................................ 18
2.3 PLUMBING FIXTURE ......................................................................................................................... 22
2.4 PRESSURE LOSSES ............................................................................................................................ 23
2.5 EXAMPLES OF TANKS CONNECTION ................................................................................................ 24
2.6 FIRST COMMISSIONING ................................................................................................................... 28
2.7 TANK CLEANING AND ANODE ROD EXCHANGE .............................................................................. 28
2.8 SPARE PARTS.................................................................................................................................... 29
3 IMPORTANT NOTICES .............................................................................................................................. 30
3.1 INSTALLATION REGULATIONS.......................................................................................................... 30
3.2 TRANSPORT & STORAGE INSTRUCTIONS ........................................................................................ 31
3.3 DISPOSAL OF PACKAGING MATERIAL AND NON-FUNCTIONING PRODUCT.................................... 31
4 ASSEMBLY GUIDE FOR ZIP-FASTENER INSULATION ................................................................................ 32
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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 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.
- 4 -
1 PRODUCT TECHNICAL SPECIFICATION
1.1 FUNCTION DESCRIPTION
Thanks to their construction and number of variants, the OKC 160 – 1000 NTR(R)/BP series water tanks enable
economic preparation of hot service water (HSW) by means of various power sources. Their nominal
performance provides sufficient amount of hot water for flat units, premises, restaurants, and similar
establishments. For HSW reheat, electricity, various types of central heating boilers, recoverable energy
sources (heat pumps, solar collectors) and combination of those can be chosen.
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 OPERATING AND INSTALLATION MANUAL FOR TYPES:
OKC 160 NTR/BP, OKC 200 NTR/BP, OKC 250 NTR/BP, OKC 200 NTRR / BP, OKC
250 NTRR / BP
1.2.1 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. For additional corrosion protection a magnesium anode is mounted
in the upper part of the tank to adjust the electric potential inside the tank, reducing the risk of corrosion.
The vessels have outlets of hot and cold water and a circulation opening welded to them. At the tanks on the
side under the plastic cover, there is a cleaning and revision opening ended with a flange; various
performance heating units may be mounted into the opening. The tank 200 - 250 l includes opening
G 6/4" which enables the assembly of heating unit series TJ G 6/4". Such version is used when the tank is
connected in solar system or a system with a heat pump, to heat water in the upper part of the tank to the
temperature required. The tank is placed on the ground, next to the heating water source, or in its vicinity.
The tank is tested with pressure of 0.9 MPa, heat exchangers with 1.5 MPa. Temperature indicator is placed
on the heater’s housing. The tank is insulated with 42 mm of polyurethane foam. The heater housing is made
of steel sheet provided with a powder coating.
The NTR version has a heat exchanger located in the bottom part of the tank, and one heating water source
is used for heating.
The NTRR version is equipped with two exchangers for an optional combination of two heating water sources;
both exchangers can be combined in a series. The NTR/BP and NTRR/BP series do not have a heating element.
The tank cannot be used for flow heating of hot water in an exchanger.
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1.2.2 CONSTRUCTION AND BASIC DIMENSIONS OF TANK
OKC 160 NTR/BP
Figure 1
Table 1
neck # 1
3/4" outer
neck # 2
1" outer
neck # 3
3/4" inner
neck # 4
1/2" inner
TYP
OKC 160 NTR/BP
A
1047
B
660 C 705 D 584 E 80 F 966 G 649 J 259 L 209 M 779 P 355
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OKC 200 NTR/BP, OKC 250 NTR/BP, OKC 200 NTRR/BP, OKC 250 NTRR/BP
Figure 2
Table 2
neck # 1
3/4" outer
neck # 2
1" outer
neck # 3
3/4" inner
neck # 4
1/2" inner
neck # 5
6/4" inner
TYP
OKC 200 NTR/BP
OKC 200 NTRR/BP
OKC 250 NTR/BP
OKC 250 NTRR/BP
A
1357
1357
1537
1537
B
660
660
660
660
C
705
705
705
705
D
584
584
584
584 E 80
80
80
80
F
1280
1280
1460
1460
G
949
859
1060
1060
I
813
680
813
680
J
259
259
259
259
L
209
209
209
209 M 779
649
779
649
N - 709 - 889
O - 1149
-
1329
P
355
355
355
355
R - 920 - 1100
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1.2.3 TECHNICAL PARAMETERS
MODEL
OKC 160
NTR/BP
OKC 200
NTR/BP
OKC 200
NTRR/BP
OKC 250
NTR/BP
OKC 250
NTRR/BP
VOLUME [l]
148 208 200 242 234
WEIGHT WITHOUT WATER [kg]
76 92 103 94 107
MAXIMUM TANK PRESSURE
[MPa]
0.6
OPERATING EXCHANGER
PRESSURE [MPa]
1
MAX. TEMPERATURE
OF HEATING WATER [°C]
110 110 110 110 110
WARM WATER MAXIMUM
TEMPERATURE [°C]
80 80 90 80 80
HEATING SURFACE OF BOTTOM
EXCHANGER [m2]
1.45 1.45 1 1.45 1
HEATING SURFACE OF UPPER
EXCHANGER [m2]
- - 1 - 1
OUTPUT OF LOWER/ UPPER
EXCHANGER AT HEATING WATER
TEMPERATURE OF 80 °C AND
FLOW 720 l/h [kW]
32 32 24/24 32 24/32
PERMANENT OUTPUT
OF WARM WATER 1 OF LOWER/
UPPER EXCHANGER [l/h]
990 990
670/650
*1080
990
670/650
*1080
TIME OF HEATING
BY EXCHANGER FROM 10°C TO
60 °C [min]
16 23 14/14 26 14/17
STATIC LOSSES [W]
75 82 82 87 87
1
Warm water 45 °C
2
The data do not relate to NTR/BP types without the unit
* Exchanger connected to series
Table 3
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1.3 OPERATING AND INSTALLATION MANUAL FOR TYPES:
OKC 300 NTR / BP, OKC 400 NTR / BP, OKC 500 NTR / BP, OKC 300 NTRR / BP,
OKC 400 NTRR / BP, OKC 500 NTRR / BP
1.3.1 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. For additional corrosion protection a magnesium anode
is mounted in the upper part of the tank to adjust the electric potential inside the tank, reducing the risk of
corrosion. The vessels have outlets of hot and cold water and a circulation opening welded to them. At the
tanks on the side under the plastic cover, there is a cleaning and revision opening ended with a flange; various
performance heating units may be mounted into the opening. The tank includes opening G6/4“ which
enables the assembly of heating unit series TJ G6/4“. Such version is used when the tank is connected in solar
system or a system with a heat pump, to heat water in the upper part of the tank to the temperature required.
The tank is placed on the ground, next to the heating water source, or in its vicinity. The tank is tested with
pressure of 0.9 MPa, heat exchangers with 1.5 MPa. Temperature indicator is placed on the heater’s housing.
The tank is insulated with 50 mm of polyurethane foam. The plastic housing (reinforced with polystyrene) is
fitted on the tank.
The NTR version has a heat exchanger located in the bottom part of the tank, and one heating water source
is used for heating.
The NTRR version is equipped with two exchangers for an optional combination of two heating water sources;
both exchangers can be combined in a series. The NTR/BP and NTRR/BP series do not have a heating element.
The tank cannot be used for flow heating of hot water in an exchanger.
- 9 -
1.3.2 DESIGN AND BASIC DIMENSIONS OF TANK
OKC 300 NTR/BP, OKC 300 NTRR/BP
Figure 3
Table 4
neck # 1
1" outer
neck # 2
1/2" inner
neck # 3
3/4" inner
neck # 4
6/4" inner
TYP
OKC 300 NTR/BP
OKC 300 NTRR/BP
A
1558
1558
B
750
750
C
810
810
D
670
670 E 77
77 F 1579
1579
G
760
760
I
895
895
J
325
325
L
330
330
M
858
858 N -
939 O -
1291
P
438
438
R
1148
1148
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OKC 400 NTR/BP, OKC 400 NTRR/BP, OKC 500 NTR/BP, OKC 500 NTRR/BP
Figure 4
* at NTR neck #3 3/4" inner, neck #4 1/2" inner
Table 5
neck # 1
1" outer
neck # 2
3/4" outer
neck # 3
1/2" inner
neck # 4
3/4" inner
neck # 5
6/4" inner
TYPE
OKC 400 NTR/BP
OKC 400 NTRR/BP
OKC 500 NTR/BP
OKC 500 NTRR/BP
A
1926
1926
1920
1920
B
755
755
800
800 C 79
79
55
55 D 650
650
700
700 E 329
329
220
220 F 944
944
965
965 G 304
304
288
288
I
1005
1005
1040
1040
J
515
515
380
380
K
1289
1289
1409
1409
L
1194
1194
1264
1264 M -
1094
-
1114 N -
1446
-
1604
O
1799
1799
1790
1790
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