Electrical work
21.11.2015
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Z20469
Copyright
2013 by: WATERKOTTE GmbH. Subject to changes.
Install and remove relay circuit board only in voltage-free state.
All connections performed directly at the plug connections of the relay circuit
board must be established with flexible lines; if necessary, intermediate termi-
nals must be used.
We recommend the use of an earth leakage circuit breaker (RCD), not ex-
ceeding 30 mA.
Replacement of mains connection cables may only be performed by customer
service or a similarly qualified person.
If variable speed pumps are operated (electronic frequency control), you have to
add a separation or coupling relays for inductive or capacitive loads (AC3 / 16 A /
230 V). In no case, the variable-speed pumps are directly wired to the relay of the
heat pump. The installation is carried out on site by a qualified electrician. For fur-
ther inquiries, we advise you gladly.
9.2
Electrical heat generator for startup and standby
9.2.1
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 tempera-
ture. Turning on the heat results immediately in a considerable evaporation in
screed, masonry and ceilings.
About 1 kWh heat is required per kg water. As a result of the construction humidi-
ty, the K-factor of the external walls can rise to twice its value. The increased heat
requirement for ventilation, particularly if interior is not finished yet, must be added.
In the process it is possible that power requirement and energy consumption ex-
ceed 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 se-
cured. In this case, the support by the electrical heat generator is not even neces-
sary, 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 stated. 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.
