Drazice OKC 250 NTRR Betriebs- und Installationshandbuch - Seite 6
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When the heater is in use without blocking the daily rate, we do not recommend the temperature to be set above 65°C.
The maximum value to select is "60".
Limiting the regulation range; locked settings.
For various safety reasons (unintentional scalding, preventing children or unauthorised person from handling), the
regulation range can be limited, or the setting on the thermostat blocked.
Regulation limited: - pull off the thermostat knob (it will be hard for the first time), and you will find two φ2.15mm
cylindrical pins on the back side of the knob
- pull off one pin and insert it to the corresponding hole of the selected maximum temperature.
- put the knob back on to the stop
To block the setting:
- set the selected temperature
- pull off the thermostat knob without changing the setting, there are two pins on the back side of
- pull off both of them and fit them into the holes corresponding with the selected temperature so
6.
PLUMBING FIXTURE
Connection of heaters to plumbing fixtures is illustrated on Fig.1. For potential disconnection of the heater, the
service water inlets and outlets must be provided with screw coupling Js 3/4". If the hot service water (HSW) distribution
is equipped with circulation circuit, the reverse pipe is connected to the inlet identified as CIRCULATION.
The 100, 125, 160 NTR and 100, 125, 160 NTR / HV types are equipped with a discharge outlet. In 200 and 250 NTR(R)
types, the HSW inlet has to be provided with a "T" fixture with a drain valve.
For operation, the heater must be equipped with a safety valve. Safety valve is mounted on the cold water inlet
identified with a blue ring.
The heaters must be equipped with a drain valve.
Each hot service water pressure heater must have a safety valve with a membrane spring. 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 drain 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.
Regulation limited
the knob
that the gap between the pins was without a hole, and the position was opposite the set
temperature.
Setting blocked
Safety valve
Admissible operating
starting pressure
water heater
(MPa)
pressure (MPa)
0.6
0.7
1
6
Max. pressure in
the cold water pipe
(MPa)
0.6
do 0.48
0.7
do 0.56
1
do 0.8