Heat production

F1345/F1355 is supplied with a heating control system, which means that the heating supply to the house takes place according to selected settings. For more information about heat production, see the Installer Manual.

Multiple heat pumps

Multiple heat pumps can be interconnected, by selecting one heat pump as the master and the others as slaves. The heat pump is always delivered as the master heat pump, and up to 8 subordinate heat pumps can be connected to it and supply up to 540 kW (with 9 x F1345-60 kW) in the same system. In systems with several heat pumps, each pump is given a unique name. External temperature sensors and control signals must be connected solely to the primary heat pump, except for external control of the compressor module and reversing valve(s) (QN10), which can be connected one to each heat pump.

External heating medium pump

With the accessory AXC 50 (one for each accessory function that will be used), an external heating medium pump (for the climate system) can be connected to the heat pump, if the alarm relay (AUX output) is activated for another function. If the AUX output cannot be used for an external circulation pump, the function can be found in:

• addition

• shunt-controlled additional heat

• pool

Extra brine pump

If there is a large pressure drop over the brine side, an external brine pump may be required.

Extra heating system

This function requires the ECS 40/41 accessory. Shunt valve, supply and return line sensors and circulation pump are connected to a second heating circuit with a lower temperature demand (e.g. underfloor heating system). The temperature in the extra heating system is in accordance with the selected curve slope and offset setting. Up to 8 extra heating systems can be connected to the installation, and each extra heating system must operate at a lower temperature than the system from which it is shunted. For further information, see the Installer Manual for the accessory.

Extra hot water heaters

For enhanced hot water.

Exhaust air recovery

Exhaust air recovery means that the heat pump recovers heat from the exhaust air and supplies it to the heating system.

This function requires the NIBE FLM accessory. The integrated fan in NIBE FLM extracts air from the various areas of the house to the recovery unit. Here, the heat energy is transferred to the installation, thereby increasing the temperature and raising the installation’s coefficient of performance.

For more information, see the manual for the ventilation.

Ground water system

With AXC 50 a ground water pump can be connected to the heat pump if the software controlled output (AUX output) is used for something else.

This connection enables the use of ground water as heat source. The ground water is pumped up to an intermediate heat exchanger. An intermediate heat exchanger is used to protect the heat pump's exchanger from dirt and freezing. The water is released into a buried filtration unit or a drilled well.

The ground water pump runs at the same time as the brine pump.

Passive cooling (cooling in 4-pipe system)

This function requires the AXC 50 accessory. The cooling system is connected to the heat pump brine circuit, through which cooling is supplied from the collector via the circulation pump and the shunt valve.

When cooling is required (activated from the outdoor temperature sensor and any room sensor), the shunt valve and the circulation pump are activated.

The shunt valve regulates so that the cooling sensor reaches the current set point value corresponding to the outdoor temperature and the set min. value for the cooling temperature (to prevent condensation).

Active/passive cooling (cooling in 4-pipe system)

This function requires the ACS 45 accessory. The cooling system is connected to the heat pump’s brine circuit, through which cooling is supplied from the collector via circulation pump and shunt valve.

When cooling is required (activated from the outdoor temperature sensor and any room sensor), the shunt valve and the circulation pump are activated.

This function permits the distribution of heat and cooling independently of each other.

Pool

POOL 40 is an accessory that enables pool heating with a compressor in your installation.

For further information, see the Installer Manual for the accessory.

Compressor selection

During pool operation and hot water production, you can choose which of the compressors will be responsible for operation. More compressor selections can be made. An example with one or two compressors for the main heat pump is shown here.

Step controlled additional heat

Additional heat that requires the AXC 50 accessory. AXC 50 via a control signal, can control step-controlled additional heat. The additional heat is used for heat production.

For further information, see the Installer Manual for the accessory.

Shunt controlled additional heat

Additional heat that requires the AXC 50 accessory. AXC 50 via a control signal, can control additional heat, which can also be prioritised. The additional heat is used for heat production.

For further information, see the Installer Manual for the accessory.

District heating additional heat

This function enables district heating additional heat to assist with heating.

For more information about district heating additional heat, see its manual.

District heating additional heat

This function enables district heating additional heat to produce both heat and hot water, including hot water circulation.

For more information about district heating additional heat, see its manual.

Shunt controlled brine

This connection makes it possible to control a shunt valve that regulates the incoming brine temperature.

The heat pump controls a shunt valve (QN41) to limit the maximum incoming brine temperature via temperature sensor (BT26). If the sensor registers a value above the maximum set temperature, the shunt valve is closed to reduce the mix of incoming brine.

The function is only active when a compressor in the system is running and requires the accessory AXC 50.

Buffer vessel (UKV)

A buffer vessel is an accumulator tank that is suitable for connection to a heat pump or another external heat source, and can have several different applications. It can also be used during external control of the heating system.

For further information, see the Installer Manual for the accessory.

Hot water circulation

A circulation pump can be controlled by F1345/F1355 to circulate the hot water. The circulating water must have a temperature that prevents bacterial growth and scalding, and national standards must be satisfied. See the appropriate Installer Manual for more information.

Hot water circulation with district heating

The hot water is enhanced with district heating, which is used with hot water circulation.

Heat dump

In the event of excess heat, this is dumped to the collector or outdoor air via a fan battery outdoors.