MELBURY HE 3800-10000 -
Installation, Use and Maintenance
18.12.2020
Page 25 / 36
4.3. Hydraulic connection
For the hydraulic connection of the heating system and
water heaters– in particular with regards to technical
safety devices such as safety valves, expansion tanks,
etc. – refer to generally accepted engineering rules as
well as locally applicable standards, specifications and
regulations.
If boilers are installed in
garret-based heating plants
or at the highest point of the heating system, then
boilers will have to be provided with additional safety
devices (such as protections against water shortage).
Observe the minimum operating pressure as specified
in chapter 2.2, page 11. Act in compliance with local
safety regulations in force at all times.
Before connecting the boiler to an
old installation
, it is
necessary to flush the whole heating system. It is also
recommended to provide for a sludge separator.
To protect the boiler from return temperatures below
the limits as specified in chapter 2.1, page 11, the
boiler should be provided with an
automatic return
temperature regulation
.
If the boilers are combined with a
water heater
, make
sure that their size and capacity correspond to the
installed boiler capacity.
A component-tested membrane safety valve must be
used to reliably prevent the permitted operating
overpressure in the water heater from being exceeded;
it must not be possible to shut the valve off from the
water heater.
When water heaters with an electrical auxiliary heater
are used, a reliable check valve must be installed in the
charging tube between the boiler and the water heater.
Boiler’s maximum operating pressure and the maximum
operating temperature are given in chapter 2.1, page
11.
No minimum level of the amount of circulating water is
required.
Damage can occur from
corrosion
when oxygen
continuously enters the heating water through open
installations, expansion tanks that are too small, floor
heaters with pipe material that is not oxygen-tight, etc.
If this cannot be prevented, additional measures are
necessary in the form of correctly used oxygen binding
agents or chemicals. If it is not possible to realize an
installation without oxygen entrance, a
system
separation
must be set up using heat exchangers.
4.4. Electrical installation
4.4.1. General notice
The electrical installation must be carried out by an
authorised electrician from beginning to end. In carrying
out the electrical installation, local regulations as well
as any standards and specifications in force must be
complied with.
The mounting instructions for the control panel and its
support can be found in the separate assembly guide.
The wiring diagram is joined with the control panel.
CAUTION:
Electrical connections, especially the connection to the mains, should only be made
after all other assembly and installation work has been completed.
Locally made installations (raceways, etc.) must not be clamped to the boiler’s
cladding!
4.4.2. Connecting to the supply mains
External supply is one-phase, alternate current type
230VAC, 50Hz or three-phase alternate current
400VAC, 50Hz, both max. 16A. The apparatus is
internally protected by a 6,3A delayed-action fuse
(burner/boiler) and by an additional 6,3A delayed-
action fuse for each additional governor or module.
The quality of the supply must respect norm EN50160
(voltage
±
10% maxi, frequency
±
1%).
All external connection cables to the boiler must be
suitably laid on site.
A DIN VDE 0116-compliant disconnecting device must
be provided on site.
!