Wall Mounting; Plumbing Fixture - Dražice OKHE 80-SMART Operating And Installation Manual

2.2 WALL MOUNTING

Prior to the mounting, check the bearing capacity of the wall and the material it is made of,
considering the weight of the heater filled with water. Depending on the wall material,
choose adequate fixtures. Should you have any doubts regarding the wall bearing capacity,
consult the suspension with a building specialist. The minimum diameter of the bolts for
suspending the heater is 12 mm. When mounting the anchor bolts follow the guide
provided by the anchor bolts' manufacturer.
Mount the anchors by the dimensional drawing on Figure 3 in 350 mm spacing, and screw firmly a steel
hinge onto the wall. Check its proper vertical positioning. Double check the torque of the suspension bolts
on the heater and suspend the heater. If needed, the suspension bolts can be shifted by 50 mm in vertical
direction. Using the detent support in the bottom part of the heater make sure it runs in parallel with the
wall!
Figure 3
If the hot water heater is mounted in a tight, small space, or in an intermediate ceiling, etc.,
you have to make sure that the connecting side of the appliance (connections to water
supply, area for electric plugging) remained accessible and no heat accumulation occurs.
Free space of up to 500 mm from the bottom edge of the heater has to be available under
the heater. When mounted directly under the ceiling, the distance from the ceiling has to be
50 mm at least.

2.3 PLUMBING FIXTURE

Power water connects to pipes with 3/4" thread in the bottom part of the heater. Blue - cold
water supply, red – hot water outlet. 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 safety valve with a membrane spring.
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 inlet pipes must have at least the same clearance as the safety valve.
Safety valves with fixed pressure settings from the manufacturer are used for the assembly.
Starting pressure of a safety valve must be identical with the maximum allowed heater
pressure, and at least 20% higher than the maximum pressure in the water main – see Table
3. 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.
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