Drazice OKC 125 NTR Operation And Installation Manual - Page 5
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Setting blocked – set the selected temperature
pull off the thermostat knob without changing the setting and you will find two pins on the back
side of the knob; pull both of them and fit them into the holes corresponding with the selected
temperature so that the gap between the pins was without a hole, and the position was opposite
the set temperature.
6.
WALL MOUNTING
Prior to mounting, check the loading capacity of the wall and, depending on the type of masonry, choose a
suitable anchorage material, or reinforce the wall, if needed. The water heater shall only be mounted in vertical
position so that the lower side of the heater was placed at least 600 mm above the floor (Fig. 4, 5). In combined
heaters, elbows have to be attached to the heating water inlet and outlet and, by turning them, the mounting either
from the right or from the left has to be determined (Fig. 2).
With regard to various types of carrying masonry and broad assortment of special anchorage material
available at the market, we do not provide heaters with this material. The anchorage system has to be selected
individually, depending on the conditions. We recommend an authorised company perform mounting on the
wall and anchorage, or discuss the anchorage with a professional.
7.
PLUMBING FIXTURE
Connection of heaters to plumbing fixtures is illustrated on Figures 1 and 2. For potential disconnection of
the heater, the service water inlets and outlets must be provided with screw coupling Js 3/4". Safety valve is
mounted on the cold water inlet identified with a blue ring.
Each hot service water pressure heater must have a membrane spring loaded with a safety valve. Nominal clearance
of safety valves is defined in the ČSN 0 60830 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 to the right. 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
Regulation limited
Safety valve
starting pressure
(MPa)
0.6
0.7
1
5
Setting blocked
Admissible operating
water heater
pressure (MPa)
0.6
0.7
1
Max. pressure in
the cold water pipe
(MPa)
up to 0.48
up to 0.56
up to 0.8