Drazice OKC 400 NTR/1MPa Manual - Halaman 4

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Halaman Cetak
Drazice OKC 400 NTR/1MPa Manual
Chart 2
Type
Tank capacity
Diameter
Weight
Operating hot service water pressure
Operating heating water pressure
Max temperature of heating water
Max temperature of hot service water
Upper exchanger heat surface
Lower exchanger heat surface
Exchanger performance at temperature drop 80/60°C
Performance number accord.to DIN 4708 upper exchanger
Performance number accord.to DIN 4708 lower exchanger
Permanent TUV performance* of upper exchanger
Permanent TUV performance* of lower exchanger
TUV*heating time by exchanger at temperature drop 80/60°C
Heat losses
*TUV - Hot service water 45°C

6. CONNECTING A HEATER TO A HOT WATER DISTRIBUTION

Implement the connection in accordance with the scheme on page 6.
Scheme of Heater's Water Inputs and Outputs
OKC 300 NTR/1MPa, OKC 400 NTR/1MPa
OKC 500 NTR/1MPa
OKC 750 NTR/1MPa, OKC 1000 NTR/1MPa
The heater's cold water inlet must be fitted with T-fittings with a discharge valve for any discharge of water from the
heater (see Section No. 11).
On the hot water input, each individually closable heater must have a test cock, backflow valve, safety valve, and a
manometer.

7. SECURITY EQUIPMENT

Each hot service water pressure heater must have a safety valve with a membrane spring. Nominal clearance of
safety valves is defined in the ČSN 06 0830 standard. The heaters are not equipped with a safety valve. The safety
valve must be easily accessible, as close to the heater as possible. The input pipes must have at least the same
clearance as the safety valve. The safety valve is placed high enough to secure dripping water drain by gravity. We
recommend mounting the safety valve onto a branch pipe. 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. If the water main pressure exceeds such value, a reduction
valve must be added to the system. No stop valves can be put between the heater and the safety valve. During the
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 heater, use a recommended
draining valve. First, close water input into the heater.
Find necessary pressure values in the following table.
For proper safety valve operation, a backflow valve
must be mounted on the inlet pipes, preventing
spontaneous heater draining and hot water penetrating
back into the water main.
When assembling the security equipment, follow ČSN 06 0830.
OKC 300
OKC 400
NTRR/1MPa
NTRR/1MPa
l
295
mm
670
kg
124
MPa
1
MPa
1,6
°C
110
°C
95
m2
1
m2
1,5
kW
35/27
57/31
NL
2,9
NL
4,2
l/h
1100
1395
l/h
670
min
24/16
20/14
kWh/24h
1,68
OKC 300 NTRR/1MPa, OKC 400 NTRR/1MPa,
OKC 500 NTRR/1MPa,
OKC 750 NTRR/1MPa, OKC 1000 NTRR/1MPa
Safety valve
starting pressure
(Mpa)
0,6
0,7
1
4
OKC 500
OKC 750
NTRR/1MPa
NTRR/1MPa
380
470
700
700
144
183
1
1
1,6
1,6
110
110
95
95
1,05
1,3
1,8
1,9
65/40
3,4
5,9
15,2
19,1
1590
740
970
23/16
2
2,3
Admissible operating
water heater pressure
(MPa)
0,6
0,7
1
OKC 1000
NTRR/1MPa
750
995
910
1010
245
315
1
1
1,6
1,6
110
110
95
95
1,17
1,12
1,93
2,45
60/33
76/32
6,2
7,1
21
26
1460
1490
815
780
37/28
43/37
3,6
3,9
Max pressure in
the cold water
pipe (Mpa)
do 0,48
do 0,56
do 0,8