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figure 2 - Typical Wiring of External Devices
EX1
EX2
EX3
X86
L
X84
X11
6
5
4
5 6
M B9
1
1
2 1
3 2
6
5
4
1
3 2
Power shedding or EJP
(peak day removal)
Tariffs, peak times/off-peak times,
day / night
External fault
** Room
thermostat
T55
** Room
thermostat
radio T58
Outdoor
sensor
** Room
control unit
T75
** Room control
unit radio
T78
External component
contact*
(faults, load
shedder, power meter)
or
or
or
* If the control device does not provide a potential-free contact,
the contact must be relayed to create equivalent wiring
In all cases, please refer to the instruction manuals for the external
components (load shedder, power meters) to create the wiring
** Option
T75 : The connection of terminal 3 of the room control unit T75 is
not mandatory (lighting of the room control unit
* If the control device does not provide a potential-free contact,
the contact must be relayed to create equivalent wiring
In all cases, please refer to the instruction manuals for the external
components (load shedder, power meters) to create the wiring
** Option
The connection of terminal 3 of the remote control is not mandatory
(lighting of the remote control)
Faults external to the heat pump
Any safety device (e g thermostat pressure switch) wired to input Ex3 (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 Ex3 (E20) to avoid excessively high temperatures in the floor.
2 1 2
Outdoor Unit Fault
When the system is switched back on after a power outage, the Hydraulic Unit may display fault 370 for a few tens
of seconds This is not a serious problem It simply means that the outdoor unit is running its tests Once the tests
have been completed, the fault should disappear
Faults are coded by LED located on the hydraulic unit interface board (see
Maintenance document "1792 - EN"
- 7 -
Split system single phase type