Installation of heat pump and domestic hot water tank
21.11.2015
44 / 76
Z20469
Copyright
2013 by: WATERKOTTE GmbH. Subject to changes.
8.6.5
Natural cooling
By use of natural cooling the whole plant is to be filled with water/ethylene-glycol
mixture (freezing point -15°C).
Heating- and heat source installation aren’t hydraulically separated.
To simplify the ventilation of the installation, the heat source- and heating installa-
tion should be filled and ventilated separately.
8.6.6
Water-Glycol mixture in the installation
Ground water plants with cooling: Minimum 15 % WATERKOTTE ethylene-glycol
in the heating plant and the separating heat exchanger – vaporizer circle.
Ground water plants without cooling: Minimum 15 % WATERKOTTE ethylene-
glycol in the separating heat exchanger – vaporizer circle.
Earth plants with cooling: Minimum 25 % WATERKOTTE ethylene-glycol in the
heating- and heat source circle.
Earth plants without cooling: Minimum 25 % WATERKOTTE ethylene-glycol in the
heat source circle.
If cooling is not wanted or not possible, the heating- and heat source circles in the
installations must be separated hydraulically. For that the ball valve No. 18 must
be closed and for safety reasons the two way motor ball valve No. 17 disconnect-
ed electrically.
Additionally a pressure expansion tank and a safety fitting are to set in at the heat
source side (see scheme).
