Drazice OKC 300 NTR/HP Manuale operativo e di installazione - Pagina 8
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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.
8.
SPARE PARTS
- Magnesium anode
- contact thermometer
When ordering spare parts, give part name, type, and type number from the heater label.
9.
HEATER CLEANING AND ANODE ROD EXCHANGE
Repetitive water heating causes limestone sediment on both the enamelled tank walls and chiefly the flange lid. The
sedimentation depends on the hardness of water heated, its temperature, and amount of hot water consumed.
We recommend checking and cleaning the tank from scale and eventual replacement of the anode rod after
two years of operation. The anode life is theoretically calculated for two years of operation; however, it changes
with water hardness and chemical composition in the place of use. Based on such an inspection, the next term of
anode rod exchange may be determined. Have the company in charge of service affairs clean and exchange the anode.
When discharging water from the heater, the combination faucet hot water valve must be open in order to avoid
creating underpressure that would prevent water discharge.
10.
INSTALLATION REGULATIONS
Regulations and instructions that must be obeyed during heater assembly:
a)
to the heating system
ČSN 06 0310 – Thermal systems in buildings – Designing and Installation
ČSN 06 0830 – Thermal systems in buildings – Protecting devices
b)
to the electrical network
ČSN 33 2180 - Connecting of electric devices and appliances
ČSN 33 2000-4-41 - Low voltage electric installations Protective measures to ensure safety – Protection against
electric shock
ČSN 33 2000-7-701 - Low voltage electric installations Single-purpose devices and devices in special premises -
Premises with tub or shower to hot service water heating system
c)
to the hot water heating system
ČSN 06 0320 - Thermal systems in buildings - Hot water preparation – Design and Project Engineering
ČSN 06 0830 – Thermal systems in buildings – Protecting devices
ČSN 73 6660 – Internal water mains
ČSN 07 7401 - Water and steam for thermal energy equipments with working steam pressure up to 8 MPa
ČSN 06 1010 - Tank water heaters with water and steam heating; and combined with electric heating
Technical requirements. Testing.
ČSN EN 12897 – Water supply – Indirectly heated closed tank-type water heaters
Both electric and water installation must follow and meet requirements and regulations relevant in the country of use.
Safety valve
Admissible operating
starting pressure
(MPa)
pressure (MPa)
0.6
0.7
1
8
Max. pressure in
water heater
the cold water pipe
0.6
0.7
1
(MPa)
do 0.48
do 0.56
do 0.8