V2.1.5
Subject to technical changes.
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Operating & installation instructions bravour
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8
Electrical connection
The module active cooling reveives the required electric power with the power supply of the heat pump. An additional
power supply is not required.
Hydraulic connection
For hydraulic connection there are no differences to heat pumps without the module active cooling. The outgoing and
backflow maintain their flow direction and are changing to cooling outflow and cooling backflow. Additional hydraulic
connections for cooling function are not available.
During start-up of the heat pump with module „Active Cooling“ take care of good
flow in heating circuit! Have a look at the data sheet of the heat pump! If this flow
is not ensured, there is the possibility of freezing of the heat exchanger, if the heat
pump operates in cooling mode during start-up unintentionally. This may lead to
damages at the heat exchanger! A flow monitoring in the heating system must be
guaranteed by the installation's operator.
During start-up with cold heating water this may be possible also at sufficient
volume flow! The water of heating circuit should not be colder than 25°C at the
first start-up!
4.2
Option N- Passive cooling
General notes
The module for externally/internal passive cooling extends the application range of your bravour heat pump by the
function to cool the building during the summer. This module is available for all bravour-models of the series BW
(brine/water) and WW (water/water). Cooling of the heating water during the summer months is achieved be transfer-
ring heat from the heating circuit to the brine circuit or the groundwater. When combining with a suitable heating and
cooling system in the house (combination of floor, wall and ceiling heating) the cooling effect can be realised for the
desired rooms. As the module for passive cooling goes without using the refrigerating circuit of the heat pump, this
gives a very reasonable possibility regarding energy consumption for cooling.
Application areas
The module for externally/internal passive cooling is based on a plate heat exchanger, as well as switching over compo-
nents (3-way-valve), which has to be installed externally/internal, and activating of cooling mode of the controller. Due
to this combination it is possible, to cool down the heating water during the summer via the plate heat exchanger. In
this case, the heat is taken up from the brine water or the ground-water and transported into the ground. The living
spaces will be cooled and the ground heated up.
By using the generously dimensioned heat exchanger, the separation of the heating water and brine water or ground-
water side continues to be kept. Filling of the heating side with antifreeze, like on the brine side, is not necessary. As
the module for passive cooling operates without using the heat pump compressor, the occurring electricity consump-
tion is low by comparison. Only the two circulating pumps of the heating side as well as the brine water side or ground-
water side will be operated.
As the function of the passive cooling is realised only via a heat exchange, a reduction of the cooling effect has to be
assumed with increasing ground or ground-water temperature. The heat, transferred into the ground will, at least in
part, be stored and taken back when need for heating starts. This leads to an improvement of the capacity and annual
operating data and can, by this, reduce the incurred electricity costs. In principle, the hot-water preparation has priority
over the cooling function.
The achievable cooling capacity cannot be given as a fixed value. It depends on the lay-out of the plate heat exchanger,
as well as dimensioning of the cooling surfaces and the brine water or well system. A reduction of the cooling capacity
during the summer can occur especially in brine water systems, as the ground continues to be heated up. With increas-
ing brine temperatures the transferable cooling capacity of the heat exchanger is decreasing.
Specification-conform application
Summary of Contents for bravour 008 BWi
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