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DHW heating
6 720 645 817 (2010/09)
64
DHW expansion vessel
Installing an expansion vessel that is suitable for
drinking water can prevent unnecessary water loss.
Install it in the cold water supply line between the
cylinder and the safety assembly. The expansion vessel
must receive a DHW flow with every DHW drawing.
The following table represents an orientation aid for
sizing an expansion vessel. Different sizes may result if
other makes of expansion vessel have different
capacities. Details refer to a cylinder temperature of
60 °C.
Overheating/flow limitation
Junkers DHW cylinders are optimised for maximum
output (N
L
factor). In case of frequent successive
short-term drawing events, the set temperature may
overshoot and a hot layer may form in the upper section
of the cylinder. These overshoots are subject to type and
will not result in a reduction of comfort or convenience.
This temperature overshoot can be reduced by
connecting a DHW circulation line with a timer or
demand-controlled DHW circulation pump (Æ page 63).
For the best possible utilisation of the cylinder capacity
and to prevent premature mixing, we recommend
restricting the cold water inlet to the cylinder to the
following flow rate:
Constant DHW output
The constant outputs shown in the specification refer to
the following:
Flow temperature 90 °C
Outlet temperature 45 °C
Cold water inlet temperature 10 °C
Maximum heat input (heat source input at least the
same as the cylinder coil output)
Reducing the specified heat input will result in a
reduction in the constant output and the performance
factor (N
L
).
Cylinder type
(10 bar version)
Vessel
pre-charge
pressure
=
cold water
pressure
Vessel size in litres
according to the
safety valve
response pressure
6
bar
8
bar
10
bar
SK 300
SE 300-1
3 bar 18 12 12
4 bar 25 18 12
SK 400
SK 400-1
3 bar 25 18 18
4 bar 36 25 18
SK 500
3 bar 36 25 25
4 bar 50 36 25
SK 800 3 bar 80 60 60
SK 1000 4 bar 150 60 60
Tab. 36
Cylinder type Flow rate
SK 300-3 ZB, SE 300-1 30 l/min
SK 400-3 ZB 40 l/min
SK 500-3 ZB 50 l/min
SK 800-ZB 80 l/min
SK 1000-ZB 100 l/min
Tab. 37
64


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