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Design information
A
Tank below oil burner pump
A Foot valve
B Fuel oil filter
C Fuel oil air vent valve
D Shut-off assembly
Suction head H in m Max. pipe length in m when the suction
line has the following diameter:
+4.0
+3.5
+3.0
+2.5
+2.0
+1.5
+1.0
+0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
Prevention of damage due to corrosion on the water side
The service life of any boiler as well as that of the complete heating
system is influenced by the quality of the water.
The cost of a water treatment facility is certainly less than the cost of
repairing damage to the heating system.
Adherence to the following requirements is a warranty condition. The
manufacturer's warranty excludes damage due to corrosion and scal-
ing.
The following is a summary of essential water qualities.
A chemical water treatment can be ordered from Viessmann for fill-
ing.
Prevention of damage through corrosion on the water side
The corrosion resistance of ferrous materials on the heating water side
of heating systems and boilers depends on the absence of oxygen in
the heating water.
The oxygen, which enters the water in the heating system when it is
filled for the first time or topped up, reacts with system materials with-
out causing any damage.
The characteristic blackening of the water after some time in use indi-
cates that free oxygen is no longer present.
PYROMAT ECO
(cont.)
B
C
D
6x1 mm
8x1 mm
100
95
89
83
77
71
64
58
52
46
40
33
27
21
15
9
—
At the max. pipe run, a total pressure drop of 0.35 bar is assumed,
based on fuel oil EL with 6.0 cSt (DIN 51603-1) when used with 1 shut-
off valve, 1 foot valve and 1 fuel oil filter.
100
100
100
100
100
100
100
100
100
100
100
100
100
100
75
44
12
The technical rules and in particular VDI Directive 2035-2 therefore
recommend that heating systems are designed and operated so that
a constant ingress of oxygen into the heating water is prevented.
Opportunities for oxygen ingress during operation:
■ Through open expansion vessels receiving a flow
■ Through negative pressure in the system
■ Through gas-permeable components
Sealed unvented systems, e.g. with a diaphragm expansion vessel,
offer good protection against the ingress of airborne oxygen into the
system, if correctly sized and operating at the correct pressure.
At all points in the heating system, including on the intake side of the
pump, the pressure must be higher than the pressure of the surround-
ing atmosphere in all operating states.
The pre-charge pressure of the diaphragm expansion vessel should
be checked at least during the annual service.
7
47
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