Nibe F1345 Manual page 20

INSTALLATION
Step controlled additional heat
Heat pumps are not usually dimensioned to provide the entire heat out-
put requirement, which is why additional output is necessary during cold
days. The external step controlled additional heater (if connected) is au-
tomatically switched on (in different steps) if the output is not sufficient
to reach the temperature levels requested by the control computer.
F1345 provides 230 V control signals for the additional heat, that is
signals for controlling external relays, contactors etc, but not to supply
them with power.
External step controlled additional heat can be controlled by up to three
potential free relays in the heat pump (3 step linear or 7 step binary).
With the AXC 50 accessory a further three potential free relays are used
for addition control, which then gives max 3+3 linear or 7+7 binary
steps.
Step in occurs with at least 1 minute interval and step outs with at least
3 seconds interval.
Master/Slave
Several heat pumps (F1345) can be interconnected by selecting one heat
pump as master and the others as slaves.
The heat pump is always delivered as master and up to 8 slaves 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 must have
a unique name, that is only one heat pump can be "Master" and only
one can be for example "Slave 5".
External temperature sensors and control signals must only be connect-
ed to the master, except for external control of the compressor module
and reversing valve(s) (QN10) that can be connected one to each heat
pump.
Software controlled output (AUX output)
It is possible to have an external connection through the relay function
via a potential free variable relay (max 2 A) on the X5 terminal block.
Optional functions for external connection:
• Indication of buzzer alarm (preselected at the factory).
• Controlling ground water pump.
• Cooling mode indication (only applies if accessories for cooling are
present or if the heat pump has the integrated cooling function).
• Control of circulation pump for hot water circulation.
• External circulation pump (for heating medium).
• If any of the above is installed to terminal block X5 it must be
selected in the control system.
The accessory card is required if two or more of the above functions are
to be connected to terminal block X5 at the same time.
20 NIBE F1345
Load monitor
When many power consumers are connected in the property at the
same time as the electric additional heat is operating, there is a risk of
the property's main fuse tripping. The heat pump has integrated load
monitors that control the electrical steps for the electrical additional heat
by disconnecting step by step in event of overload in a phase. Reconnec-
tion occurs when other current consumption is reduced.
A current sensor should be installed on each incoming phase conductor
in to the distribution box to measure the current. The distribution box is
an appropriate installation point.
USB service outlet
F1345 is equipped with a USB socket in the display unit. This USB socket
can be used to connect a USB memory stick to update the software,
save logged information and handle the settings in F1345.