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The boiler has a blocking input. A potential-free contact can be connected
to the BL terminals of the connector. If the contact is opened, the boiler will
be blocked.
Change the function of the input using parameter AP001. This parameter
has the following 3 configuration options:
Complete blocking: no frost protection with the outdoor sensor and no
boiler frost protection (pump does not start and burner does not start)
Partial blocking: boiler frost protection (pump starts when the
temperature of the heat exchanger is < 6°C and the burner starts when
the temperature of the heat exchanger is < 3°C)
Lock out: no frost protection with outdoor sensor and partial boiler frost
protection (pump starts when the temperature of the heat exchanger is <
6°C, the burner does not start when the temperature of the heat
exchanger is < 3°C).
Release input
Caution
Only suitable for potential-free contacts (dry contact).
The boiler has a release input. A potential-free contact can be connected
to the RL terminals of the connector.
If the contact is closed during a heat demand, the boiler will be blocked
immediately.
If the contact is closed when there is no heat demand, the contact does
nothing until the main PCB receives a ‘start burner’- command. After that
command, a waiting time starts. If the contact is closed during this
waiting time, the burner does not start and the boiler will be blocked. Set
the waiting time with parameter AP008. A waiting time of 0 will disable
the contact.
Connecting an outdoor sensor
An outdoor sensor can be connected to the Tout connector. In the case of
an on/off thermostat, the boiler will control the temperature with the set
point from the internal heating curve. An OpenTherm controller can also
use this outdoor sensor. In that case, the desired internal heating curve
must be set on the controller.
Use below mentioned sensors, or sensors with identical characteristics.
Set parameter AP056 to the installed outdoor sensor type.
AF60 = NTC 470 Ω/25°C
QAC34 = NTC 1000 Ω/25°C
1. Connect the plug from the outdoor sensor to the Tout connector.
Frost protection combined with outdoor sensor
The central heating system can also be protected against frost in
combination with an outdoor sensor. The radiator valve in the frost-
sensitive room must be open.
Fig.25 Blocking input
AD-3000972-02
BL
Fig.26 Release input
AD-3001303-02
RL
Fig.27 Connecting an outdoor sensor
AD-3000973-02
Tout
5 Installation
7684359 - v.11 - 13122021 27
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