Publicité
12.2
12.2 Cold Generation by Active Cooling
12.2.1 Heat Pumps without Additional Heat Exchangers
Cold is generated actively by reversing the process in the heat
pump. The refrigerating cycle is switched from heating to cooling
operation using a four-way reversing valve.
NOTE
The heat pump is blocked for 10 minutes when it is switched from heating
to cooling operation. This allows the different pressures in the
refrigerating cycle to equalize.
12.2.2 Heat Pumps with Additional Heat Exchangers for Waste Heat Recovery
A heat exchanger in the hot gas can use the waste heat
generated during cooling for DHW or swimming pool water
preparation. The heat exchanger menu item must be set to
"YES" to do this.
Requests are processed as follows:
Cooling first
DHW first
Swimming pool
Adjust the maximum temperature "Parallel operation heat –
domestic hot water" in the menu item "Settings – domestic
12.3 Cold Generation via Passive Cooling
In the summer, the ground and the ground water are significantly
colder at greater depths than the ambient temperature. A plate
heat exchanger installed in the ground water or brine circuit,
transfers the refrigerating capacity to the heating and cooling
circuit. The heat pump compressor is not active and is therefore
available for DHW preparation.
Activate parallel operation of cooling and DHW preparation in the
menu item "Settings - Domestic hot water - Parallel cooling -
DHW".
NOTE
Ensure that the special hydraulic installation requirements are fulfilled for
the parallel operation of cooling and DHW preparation (see Project
Planning and Installation Manual for Heating and Domestic Hot Water).
12.4 Cooling Program Description
12.4.1 Cooling Operating Mode
The cooling functions are manually activated as operating mode
6. There is no automatic switching between heating and cooling
operation. External switching is possible via input N17.1-J4-ID4.
The "Cooling" operating mode can only be activated if the
cooling function (active or passive) has been enabled in the
preconfiguration.
EN-34
Requests are processed as follows:
DHW first
Cooling first
Swimming pool
The heat pump operates as in heating operation during DHW or
swimming pool water preparation.
hot water". As long as the hot water temperature remains below
this limit, the hot water circulating pump runs during cooling
operation. Once the maximum set temperature has been
reached, the hot water pump is switched off and the swimming
pool pump is switched on (independent of the swimming pool
thermostat input).
If cooling has not been requested, requests for domestic hot
water or the heating requirements of the swimming pool can be
processed. However, if cooling has been requested, these
functions are each cancelled after a maximum continuous
runtime of 60 minutes and priority is given to the cooling request.
Passive Cooling with Borehole Heat Exchangers
(Bridge A6/ID7 removed)
If cooling is required, an additional primary cooling pump (M12)
can be connected to output NO6. The output of the primary
circulating pump M11 is only active in heating operation.
Passive Cooling with Ground Water
(Bridge A6/ID7 fitted)
If there is a request for cooling, the primary pump M11 is
activated, i.e. the same primary pump is used in both heating and
cooling operation (e.g. well pump with water-to-water heat
pumps).
Switching off cold generation
The following limits are provided as safeguards:
The flow temperature falls below a value of 7 °C
Activation of the dew point monitor at vulnerable points in
the cooling system
The dew point is reached with silent-only cooling
Publicité
Chapitres
