Robur K18 Hybrigas, Installation, Use And Maintenance Manual, Page: 26 / 60

Heating engineer
26
3
Figure 2.4
Minimum open area above the outdoor units
A 2,5 m min
2.5 MOUNTING BASE
Mounting base constructive features
▶
Place the appliance on a levelled flat surface made of fire-
proof material and able to withstand its weight.
In order to simplify maintenance operations even in case
of adverse weather conditions (snow, heavy rain ...) it is
suggested to install the unit at a height of about 300 mm
from the ground.
(1) - installation at ground level
▶
Failing a horizontal supporting base, make a flat and levelled
concrete base, at least 100-150 mm larger than the appli-
ance dimensions per side.
(2) - installation on terrace or roof
▶
The structure of the building must support the total weight
of the appliance and the supporting base.
▶
If necessary, provide a maintenance walkway around the ap-
pliance.
Anti vibration mountings
Although the appliance's vibrations are minimal, resonance
phenomena might occur in roof or terrace installations.
▶
Use vibration damper supports (available as optional fea-
tures).
▶
Also provide anti-vibration joints between the appliance
and water and gas pipes.
3 HEATING ENGINEER
3.1 WARNINGS
General warnings
Read the warnings in Chapter III.1 p. 4, providing im-
portant information on regulations and on safety.
Compliance with installation standards
Installation must comply with applicable regulations in
force, based on the installation Country and site, in mat-
ters of safety, design, implementation and maintenance
of:
„
heating systems;
„ cooling systems;
„ gas systems;
„
flue gas exhaust;
„
flue gas condensate discharge.
Installation must also comply with the manufacturer's
provisions.
3.2 INSTALLATION
3.2.1
Primary and secondary heating circuit
The K18 Hybrigas appliance can operate in plants with primary
circuit only, or in plants with primary and secondary circuits with
hydraulic separation: in the first case the water pump managed
by the K18 Hybrigas unit ensures water circulation also for the
users; in the second case water circulation in heating circuits is
ensured by dedicated water pumps.
With regard to the generation part, the layout must be set up
as shown in Figure 3.1 p. 27 (refer to Figure 3.2 p. 27 for the
corresponding K18 Hybrigas EVO version).
With regard to the heating distribution circuits, the solutions
described in Figures 3.3 p. 28, 3.4 p. 28, 3.5 p. 29 and
3.6 p. 29 are possible.
3.2.2
Constant ot variable water flow
The K18 Hybrigas unit may operate with constant or variable
water flow, according to electronic board settings (Paragraph
5.7 p. 45).
System and components must be designed and installed
consistently.
3.2.3 Minimum water content
High thermal inertia is conducive to efficient appliance opera-
tion. Very short ON/OFF cycles are to be avoided.
A buffer tank (input on the top and output on the bottom) is not
strictly required but suggested in systems with low water con-
tent in the primary circuit to ensure a minimum load during the
periods of medium to low thermal demand. It is recommended
in systems where the system water flow can be significantly re-
duced, and therefore, in the presence of:
▶
2-way zone valves;
▶
thermostatic valves on radiators;
▶
heating circuits with several zones.
A capacity of 80/100 liters is usually adequate.