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Connecting the domestic hot water side
Notes regarding the safety valve
The system must be equipped with a
type-tested diaphragm safety valve
as protection against overpressure.
Permiss. operating pressure: 10 bar.
The connection diameter of the
safety valve must be as follows:
H for 200 litre capacity at least R ½"
(DN 15), max. heating load 75 kW,
H for 300 to 1 000 litre capacity at
least R ¾" (DN 20), max. heating
load 150 kW,
H in excess of 1 000 to 5 000 litre
capacity at least R 1" (DN 25),
max. heating load 250 kW,
If the heating load of the DHW
cylinder lies above the max. heating
load allocated to the capacity, select
a larger safety valve that is big
enough for the actual heating load
(see DIN 4753 1, issue 3/88,
section 6.3.1).
Install the safety valve in the cold
water pipe. It must not be able to be
isolated from the DHW cylinder.
(cont.)
The pipework between the safety
valve and the DHW cylinder must not
be restricted in any way. The safety
valve blow-off line must not be able
to be closed. Expelled water should
be safely and visibly drained into a
dewatering unit. It is advisable to
place a sign close to the safety valve
blow-off line or on the safety valve
itself with the following inscription:
"For safety reasons, water may be
discharged from the blow-off line
during heating. Never seal off."
The safety valve should be installed
above the top edge of the DHW
cylinder.
11
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