15
Pump controlled pressure maintaining systems
!
Please note
Pressure fluctuations may cause
damage to the boiler or to other
system components.
In heating systems with auto-
matic pressure maintaining sys-
tems, and in particular pump con-
trolled systems with integral dea-
eration, we recommend the
installation of an expansion ves-
sel for individual boiler protec-
tion.
This reduces the frequency and
level of pressure fluctuations.
This contributes considerably to
improved operational reliability
and longer service life of the sys-
tem components.
Boiler
output
kW up to
300
up to
500
up to
1000
Expan-
sion ves-
sel
litre 50 80 140
!
Please note
The ingress of oxygen can result
in system damage as a conse-
quence of oxygen corrosion.
Ensure that only pump controlled
pressure maintaining systems
that are sealed against corrosion
and protected against oxygen
ingress into the heating water are
used.
Pump controlled pressure main-
taining systems with atmospheric
deaeration through cyclical pres-
sure release create a central
post-venting of the heating sys-
tem. However, this does not rep-
resent oxygen removal in the
sense of corrosion protection
according to directive VDI 2035
sheet 2.
Carry out all checks in accordance with
the manufacturer's instructions. Limit
pressure fluctuations to the lowest pos-
sible differential. Cyclical pressure fluc-
tuations and more significant pressure
differentials point towards a system fault.
Immediately remedy such faults, other-
wise other heating system components
may become damaged.
Checking the water quality
Observe the instructions in chapter
"Water quality requirements".
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5692 701 GB
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