Ferroli Optimax HE 31 C Instructions For Installation, Use And Maintenance Manual page 17

OPTIMAX HE 31 C
The user must never change the unit's power cable. If the cable gets damaged, switch off the unit
and have it changed only by professionally qualified personnel. If changing the electric power cable,
use only "HAR H05 VV-F" 3x0.75 mm
Access to the electrical terminal block
Follow the instructions given in fig. 20 to access the electrical connection terminal board. The layout of
the terminals for the various connections is given in the wiring diagram in the Technical Data chapter.
Key
72 Room thermostat (Volt Free)
138 Outside temperature sensor
139 Room unit (OpenTherm)
2 cable with a maximum outside diameter of 8 mm.
fig. 20
fig. 21
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