Technical data

www.dimplex.de 01.2012 | Project planning manual for heat pumps for heating and domestic hot water preparation | 107
Integration of the heat pump in the heating system 8.6.5
Fig. 8.23: Dimensions of the 200 l and 500 l buffer tanks (see also Table 8.6 on page 105)
Fig. 8.24: Dimensions 1000l buffer tank
8.6.4 Expansion vessel / safety valve in the heat pump circuit
When water is heated up, there is an increase in pressure in the
heat pump circuit (due to the expansion of the heating water)
which must be compensated for by the expansion vessel. The
design is dependent on the heating water volume and the maxi-
mum system temperatures.
An impermissibly high pressure can build up in the heating sys-
tem when the system is being filled or the water is being heated.
This excess pressure must be discharged via a safety valve ac-
cording to EN 12828.
Bivalent systems
The expansion vessel and safety valve integrated in the boiler
circuit is ineffective if the mixer is closed tightly. For this reason,
each heat generator must be equipped with a separate safety
valve and expansion vessel. These are dimensioned according
to the total volume of the system (heat pump, cylinder, radiators,
pipework, boiler).
8.6.5 Check valve
If a water circuit contains more than one circulating pump, each
pump unit must be equipped with a check valve to prevent mixing
from other heating circuits. It should be ensured that check
valves close tightly and are noiseless during flow-through.
NOTE
Dirt particles can prevent the valves from fully closing. This could, for ex-
ample, lead to insufficient domestic hot water temperatures and swim-
ming pool temperatures if cold heating water is added during domestic
hot water preparation and swimming pool heating.
&\OLQGHUFRYHU
7\SHSODWH
+HDWLQJZDWHU RXWIORZ
5HGLWHP³³
9HQWLODWLQJYDOYH
,QVWDOODWLRQLQIRUPDWLRQ
7\SHSODWH
,QVWDOODWLRQLQIRUPDWLRQ
%ODQNIODQJH
6HDO
,QVXODWLRQ
)ODQJHFRYHU
&\OLQGHUFRYHU
5HGLWHP³³
9HQWLODWLQJYDOYH´
+HDWLQJZDWHU LQIORZ
(OHFKHDWLQJHOHPHQW
(OHFKHDWLQJHOHPHQW
(OHFKHDWLQJHOHPHQW
(OHFKHDWLQJ HOHPHQW
(OHFKHDWLQJ HOHPHQW
(OHFKHDWLQJ HOHPHQW
+HDWLQJZDWHU RXWIORZ
+HDWLQJZDWHU LQIORZ