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4. Installation
4.9.7. Frost protection
Frost protection in combination with ON/OFF
thermostat
If an on/off thermostat is used, it is advisable to
protect any rooms where there is risk of frost by using
a frost thermostat. The radiator valve in a room where
there is a risk of frost must, however, be open.
•
In rooms where there is a risk of frost, a frost
thermostat (Tv) should preferably be installed.
•
Connect the frost thermostat in parallel with an
on/off room thermostat (Tk) to the ON/OFF-OT
terminals of the connector.
i
When using a OpenTherm thermostat, a frost
thermostat cannot be connected in parallel
to the ON/OFF-OT terminals. Implement
frost protection for the heating system in
combination with an external sensor.
Frost protection in combination with an
outdoor sensor
The heating system can also be protected against frost
in combination with an outdoor sensor. The radiator
valve in a room where there is a risk of frost must,
however, be open. Connect the outdoor sensor to the
Tout terminals of the connector.
The frost protection functions as follows where an
outdoor sensor is used:
•
At an outdoor temperature lower than 14ºF/-10ºC
(can be set with parameter p30): the circulation
pump switches on.
•
At an outdoor temperature higher than 14ºF/-10ºC
(can be set with parameter p30): the circulation
pump continues to run and then switches off.
MCA-Pro ISM Rv.4.1 2/2017
MCA Pro 45/65/90/115
57
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