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4.7. Connecting temperature sensors or external electrical controls
4.7.1. Accessing sensor terminals
In order to access
sensor terminals,
main and control power supply must be disconnected.
After
power supply
is disconnecte
d
remove
front panel according to chapter 4
.4.
4.7.2. Connecting external temperature sensor
External temperature sensor (delivered with boiler) must be fitted in such manner that it is not affected
by sudden temperature changes (exposure to direct sunlight). When fitting sensor please observe the
arrow marking top position (it can be seen when protective cover is removed).
Connector for outdoor temperature sensor has factory mounted resistor for
testing boiler
at
-13º
C.
After installation and initial testing, resistor must be removed and wires from external temperature
sensor must be connected
.
protective cover
External temperature sensor
Label below terminals on switchboard –
option O
Label below terminals on switchboard –
option V
Note:
For connecting external temperature sensor two-wire cable can be used, of diameter from
0.6mm
2
to 1.5 mm
2
.
4.7.3. Connecting domestic hot water temperature sensor
Domestic hot water temperature sensor (delivered with
the
boiler) must
be fitted in such manner that
reading of correct cylinder temperature is ensured.
W
ater cylinder usually
has a spot provided for
inserting temperature sensor. If this is not
the
case temperature sensor must have contact with metal
part of the cylinder (under the insulation).
Water Cylinder temperature sensor
Label below terminals on switchboard –
option V
This is applicable only to T
h
ermo
Extra boilers with option
al
"
V
" control panel upgrade
This is applicable only to T
h
ermo
Extra boilers with option
"
O
" and "
V
"
control panel upgrades
