1.
Important information
1.1
Safety
Installation and maintenance work can – due to the high
system pressures, high temperatures and live electrical
parts – be associated with hazards and may only be per-
formed by specialists. Heat pumps may only be installed
by capable specialists and only put into operation by spe-
cialists who have been specially trained by Hoval for this
purpose. Power supply to the system should be switched
off when work is being performed on the heat pumps and
safeguarded against inadvertent reswitching. Moreover,
all safety instructions in the respective documents, as
well as on adhesive labels on the heat pumps themsel-
ves and in other applicable safety regulations, must be
observed.
The instructions in your possession for our UltraGas®
condensing boilers (250D-2000D) provide additional in-
formation about setup and commissioning of the double-
boiler plant.
Basic information about the technical details,
commissioning, maintenance and operation
can be found in the supplied instructions:
Technical information and installation instruc-
tions
Operating instructions
It is essential for the boiler to be commissi-
oned by a Hoval service technician or a trai-
ned Hoval partner.
WARNING
Risk of poisoning and explosion if gases leak
out.
Immediately disconnect the gas supply.
WARNING
The heat generator can only be de-energised
by disconnection from the mains (e.g. all-po-
le switch).
WARNING
All electric power supply circuits must be
switched off before accessing the terminals.
NOTICE
Maximum over pressure in the common flue
gas conduit 60 Pa.
1.1.1 Signal words
!
DANGER
... indicates a situation of immediate danger
which will lead to serious or fatal injuries if
not avoided.
!
WARNING
... indicates a situation of possible danger
which can lead to serious or fatal injuries if
not avoided.
!
CAUTION
... indicates a situation of possible danger
which can lead to minor or slight injuries if
not avoided.
NOTICE
... indicates a situation of possible danger
which can lead to damage to property if not
avoided.
Structure
!
CAUTION
Nature of hazard,
Possible consequences,
Measures to avert danger.
3
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IMPORTANT INFORMATION
