Installation and connection
04.12.2015
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Copyright
2014 by: WATERKOTTE GmbH. Subject to changes.
7.3.3
Flow monitoring
When using water as heat source, the evaporator of the heat pump can be
destroyed by ice formation due to lack of water (frost damage). Repeated
switching on of heat pump in an improper forced manner may easily result
in total loss. For this reason, we specify a reliable protective measure
against lack of water. The protective measure consists of two devices that
function independently of one another:
a)
Temperature limit by controller: For this purpose, the controller is config-
ured for operating mode "Heat source water" This solution allows that:
a warning is generated if value drops below +1 °C and
operation is interrupted when value drops below -1 °C.
b)
Because the measure mentioned under a) cannot react quick enough in
case of sudden lack of water, an additional low water safety device must
be provided.
A low water safety device consists of a float-type volume display with ad-
justable limit indicator (limit indicator is a Reed contact).
Function:
The heat pump control switches the compressor on with a time delay to
"pump heat source". The start of the compressor is only enabled if the min-
imum water volume is present during the lead time and the limit indicator
did not respond. This device remains active during the entire operation of
the heat pump. If water volume drops below the permissible level during
operation, the heat pump is shut down. This device provides maximum se-
curity because it virtually covers all risks, such as filter contamination, evap-
orator contamination, overloaded well, etc.
Damages caused by freezing of evaporator result in exclusion of warranty!
Heat pump
Optimized volume flow in l/h when
ground water is 10 °C / 6 °C
(
t=4K)
Min. volume flow in l/h when
ground water is 10 °C / 4 °C
(
t=6K)
EcoTouch
DS 5028.5
5000
3300
EcoTouch
DS 5034.5T
6200
4134
EcoTouch
DS 5045.5T
8100
5400
EcoTouch
DS 5056.5T
10100
6734
Table for setting the limit contact at 10 °C inlet temperature. The volume flow correspond to a cooling of 6K.
The volume flow has to be increased at a lower inlet temperature
(< 10 °C). The outlet temperature of the heat pump should not fall below a
value of 4 °C !
