WATERKOTTE EcoTouch DS 5027 Ai, Planning And Installation Manual

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Electrical work
2005/06/10
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Copyright

2013 by: WATERKOTTE GmbH. Subject to changes.

We recommend the use of an earth leakage circuit breaker (RCD), not
exceeding 30 mA.

Replacement of mains connection cables may only be performed by
customer service or a similarly qualified person.
8.2 Electrical heat generator for startup and standby
Initial heating of buildings during winter months:
Humid, cold building condition represents a deficiency due to neglected
drying measures. As a result, the initial heat requirement is significantly
higher. The reason for this:
The mass of the building must reach the required temperature. Turning on
the heat results immediately in a considerable evaporation in screed, ma-
sonry and ceilings.
About 1 kWh heat is required per kg water. As a result of the construction
humidity, the K-factor of the external walls can rise to twice its value. The
increased heat requirement for ventilation, particularly if interior is not fin-
ished yet, must be added.
In the process it is possible that power requirement and energy consump-
tion exceed the standard value by 100 %. Since the situation mentioned
happens quite frequently, the heat pump is equipped with an additional
electrical heat generator (EWE).
The additional energy consumption must be attributed to construction
costs and not to heating costs.
What must be considered when heat pump functions as heat generator?
When a heat pump uses groundwater as heat source, the extended
runtime is without consequence if the performance of the drawing well and
return well is secured. In this case, the support by the electrical heat gener-
ator is not even necessary, as long as the fact that room temperature is
reached only slowly is of no concern.
When using a heat pump with geothermal heat source, there are concerns
about the excessive demand of the heat source under the conditions stat-
ed. There is always a risk when the heat pump has to work in permanent
mode for days. The heat source cannot regenerate itself continuously; in
unfavourable cases the ground can be subject to frost action in areas with
horizontal withdrawal.
8.2.1 Startup of electrical heat generator (EWE)
The EWE is an additional device with many uses,
operation without heat pump (compressor automat switched off):
After the heating circuit has been filled and vented, the EWE can be operat-
ed ; the WWPR controller must be parameterised accordingly.
At the domestic distribution a check must be performed to ensure that the
automats are switched on and the electrical counter rotates accordingly.
Due to safety reasons, a label placed on the controller cover must refer to
the temporary solution, i.e. „Electrical heat generator temporarily activated“.