ALUTHERM
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Boilers 10
ALUTERM A 170 - 300
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Installation, user and service manual
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instructions for user
Heating
Alutherm A 170 - 300
4.2.3
Outside Temperature Control OTC (optional)
The boiler may use an outdoor sensor to provide weather compensation (OTC). To activate weather compensation, connect an outdoor sensor to
numbers 5 and 6 on the terminal strip C2. Pin numbers 1 and 2 have to be bridged by a wire. Alternatively, those pin numbers (1 and 2) can be used
for connecting room thermostat on/off. In the technician menu, under advanced CH settings, CH request, OTC only must be selected. The outdoor
sensor is then automatically detected by the controller. The parameters corresponding with A-E in the figure below can be set in the technician
menu (advanced CH settings).
A OTC offset: minimum CH setpoint value
B OTC setpoint maximum: maximum CH setpoint value
C OTC weather cold: external temperature value at which the maximum CH value will be used.
D OTC weather warm: external temperature value at which the minimum CH value will be used
E OTC warm weather shutdown: external temperature value at which the CH demand will end
In the user menu an eco-setpoint reduction (night reduction) can be set. Day, week and weekend options are also be available (on, eco, off)
The outdoor sensor is available as an optional accessory.
The sensor should be installed on the north-side of the building at a height of approximately 2 meters.
Note: The resistance of the outdoor NTC should be 12 kOhm at 25 °C. Also see table of resistance for NTC’s at 6.6.2
4.2.4
Optional digital communication
The boiler supports digital communication with room thermostats using Open-Therm communication protocols (automatically recognised if
connected to pins 1 + 2 on terminal strip C2, also see 4.2.1.
CH Setpoint
Ext Temp
B
A
E D
C
