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Page 28 of 33
Electrical connection
The heat pump must be connected to electri-
cal installation by an authorised electrician.
2x230 V, N + PE, - 13 A, 50 Hz
1x230 V, N + PE, - 20 A, 50 HZ
Supply cable: 4x1,5mm², HO5W-F
The supplied electrical diagram shows how to
connect the system to the grid
Floor heating loop
IMPORTANT: An overflow valve must be installed (Figure 5, no. 28) in the floor heating loop with a
fixed-speed circulation pump. Alternatively, individual thermostats must be installed to maintain
sufficient flow.
It is possible to connect an external run signal to the pump control unit (see wiring diagram) from
eg a floor heating system.
Starting with software version 1.10 of LMC223, this works as an external summer-/winter shift. In
the controller menu SERVICE SELECT USER FUNK can be select HEATING. . When HEATING is
chosen you make and extreme change between winter - and summer operation. The controller is
forced to run in winter operation when the digital input 4 is close. Conversely, the control is forced
to run in summer operation when the digital input 4 is open. In winter operation the pump in central
heating is running. User Function HEATING assumes that the system is in DRIFT-AUTO.
Ground source loop
When setting up a ground source loop, there are a number of clearance requirements which must
be complied with to ensure efficient and trouble-free operation. Furthermore, local authorities often
stipulate their own requirements for installation and approval of the system before it is commis-
sioned.
