Installing The External Temperature Sensor; Electrical Connection Between The Boiler And The External Sensor; Enabling Operation With The External - Biasi RINNOVA COND 24S User Manual And Installation Instructions

00 = Room thermostat
01 = Remote control
Figure 5.26
• Press 12 or 13 (Figure 5.22) to confirm the
value entered and return to the list of param-
eters (Figure 5.25).
• Press 17 (Figure 5.22) to exit "programming
mode".
5.16 Installing the external tempera-
ture sensor
(optional)
The external sensor must be installed on an
external wall of the building avoiding:
• Direct radiation of the sun's rays.
• Damp walls or walls where mould forms.
• Installation near fans, drain outlets or chim-
neys.
5.17 Electrical connection between
the boiler and the external sensor
To connect the external sensor to the boiler,
use electric cables with a cross section of no
less than 0.50 mm .
2
The electrical conductors for connecting
the external sensor to the boiler must go
through different channels to those for the
mains voltage (230 V), as they are supplied
at a safe low voltage and cannot exceed 20
metres in length.
Use the control board terminals indicated in
Figure 5.27 to connect the external sensor.
The external sensor connection wires must
follow the path indicated of the ambient ther-
mostat and come through the back of the boil-
- 44 -
INSTALLATION
RESET
bar
er.
Boiler side
Volt-free contacts
for the ambient
thermostat
External
sensor
Figure 5.27
5.18 Enabling operation with the ex-
ternal sensor and setting the K
coefficient
The boiler is set with a K coefficient of zero for
operation without the probe connected.
The K coefficient is a parameter that increas-
es or decreases the boiler delivery tempera-
ture as the outdoor temperature varies.
When installing the external sensor, this pa-
rameter must be set based on the efficiency
of the heating system to optimise the delivery
temperature.
With heating temperature setting 25-85°C
(Figure 5.28) (factory preset) or temperature
setting 25-55°C (Figure 5.29) or temperature
setting 50-80°C (Figure 5.30) (see "Selecting
the heating temperature set" on page 47).