Drazice TO 1 IN, Руководство по эксплуатации и установке

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- 30 -
EN
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.
We recommend that the hot water distribution from the heater was as short as
possible to minimise heat losses.
Heaters must be provided with a discharge valve mounted on the cold service water inlet
to the heater for potential disassembly or repair.
8. ELECTRIC INSTALLATION
The electric wiring scheme is attached in the manual to the water heater (Fig. 2). The heater has to be
connected via a separate supply with a front - end main switch. The heater is connected to the 230V/50Hz
electric network using a conductor with a contact plug fitted with a switch that turns off all network poles
and the circuit breaker (protector). Electric installation must comply with valid electrotechnical standards.
Connection of the heater to electric network shall be executed following the plumbing fixture. In order to
enhance the protection of coupling in bathrooms and shower corners pursuant to ČSN 332000 - 7 - 701, the
appliance is provided with a grounding terminal for connecting with a yellow - green protective conductor
on minimum section 4 mm2. Access to the electric part of the heater is enabled only upon disconnecting
the heater from power supply and unscrewing the guard of the heater.
The degree of protection of electric parts of the heater is IP 24.
Respect the rules of protection against electricity injuries in accordance with ČSN 33 2000 – 4 - 41.
Safety valve starting
pressure (MPa)
Admissible operating
water heater pressure
(MPa)
Max pressure in the
cold water pipe (MPa)
0.6 0.6 up to 0.48
0.7 0.7 up to 0.56
1 1 up to 0.8