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Heat Pump, Split System, Single Service, 3 phase
24
Maintenance
Document
1394-1
Faults external to the heat pump
Any safety device (e.g. thermostat pressure switch)
wired to input Ex6 (E20) allows external problems to
be reported and the heat pump to be immediately
stopped. For example, a safety thermostat on the
heating floor can be wired to input Ex6 (E20) to avoid
excessively high temperatures in the floor.
Figure 1: Typical Wiring of External Devices
If the control unit does not provide a potential-free
contact, the contact will have to be relayed to obtain
an equivalent wiring.
In any case, you should refer to the manuals for the
external devices (e.g. load shedders, electricity
meters) to perform the wiring.
…
Phase
Neutral
He
at pump c
o
n
n
ec
ting
bloc
ks
…
X5
X6 X7 X8
to inputs Ex4,
Ex5 or EX6
External
device
contact
(e.g. load-
shedder,
electricity
meter)
Heat pump
Hydraulic Unit