Fujitsu WATERSTAGE 112 Maintenance Document page 24

Heat Pump, Split System, Single Service, 3 phase
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
If the control unit does not provide a potential-free
contact, the contact will have to be relayed to obtain
an equivalent wiring.
24
External
device
contact
(e.g. load-
shedder,
electricity
meter)
Figure 1: Typical Wiring of External Devices
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.
Phase
Neutral
to inputs Ex4,
Ex5 or EX6
Heat pump
Hydraulic Unit
In any case, you should refer to the manuals for the
external devices (e.g. load shedders, electricity
meters) to perform the wiring.
Maintenance Document 1394-1