Installation manual

182
8.5.4
Fig. 8.12: Dimensions of the PSP 140E built-under buffer tank for air-to-water heat pumps installed indoors (see also Table 8.4 on p. 181)
Fig. 8.13: Dimensions of the 200 l and 500 l buffer tanks (see also Table 8.4 on p. 181)
8.5.4 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.
Dimensioning is dependent on the heating water volume and the
maximum system temperatures.
An impermissibly high pressure can build up in the heating
system when the system is being filled or the water is being
heated. This excess pressure must be discharged via a safety
valve according 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).
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