36 / 156
00BNO9168-I (U0606551)
VARMAX -
Installation, Use and Maintenance
4.12. Hydraulic connection
The presence of an integrated irrigation pump in the boiler and an
intelligent control logic enables optimal operation up to IUP/30 (IUP =
Instant Useful Power expressed in Th/h - 1Th/h = 1.163 kilowatts).
Below this throughput of IUP /30, the boiler will continue to operate, but
will gradually lose power (boiler stops below IUP /46).
In connector sleeves 3 and 4, there is no minimum throughput constraint
on the condenser.
In the main heat exchanger, as in the condenser, you must ensure
that you never exceed the throughput prescribed in section 3.4 (boiler
nominal useful power / 10).
Sizing the pipes connecting the boiler to the installation must be done
carefully, to minimise the pressure losses and so avoid oversized circulating
pumps.
In some cases the diameter of the connection pipes will be greater than the
diameter of the boiler tappings. The diameter can then be usefully increased
after the union connectors, the stop valves, and/or the hydraulic balancing
valves.
VARMAX boilers are equipped with the following elements:
•
main exchanger drain valve,
• condenser drain valve.
It is mandatory to fit the boiler and its installation with the following elements:
•
isolating valves on the flow and return tappings,
•
an expansion vessel. In the case of a cascade of boilers in 3 nozzles, we
recommend connecting the expansion to the high temperature common return,
•
an efficient bleed device*,
•
a safety valve set to 6 bar*,
•
A shut-off on the boiler's fill circuit in relation to the main supply.
(*Supplied and mounted on the future "condenser" circuit of the 4-pronged
versions but to be installed on the main exchanger)
VARMAX boilers are available with 2/3 tappings or 4 tappings. It is not
possible to transform a version with 2/3 tappings into a version with 4
tappings and vice versa.
4.12.1.
Warranty conditions for Varmax connection in 2, 3 or 4 connections:
•
Respect the maximum flow rates of the condenser and the main
exchanger equal to P / 10, P being the nominal useful power of the boiler
in Th / h.
•
No minimum flow rate in the VARMAX condenser.
•
Instantaneous DHW production without the presence of a primary flask
is prohibited.
Instantaneous DHW production generates premature aging of the
generator with a very large number of M / A cycles.
The sizing of the primary balloon must make it possible to avoid an
excessive number of cycles M / A of the generators.
