Daikin Rotex GW-20 C22 Installation Instructions Manual page 61

2.5.1 Frost protection
The unit is fitted with frost protection in order to prevent it from
•
freezing. If the temperature of the heat exchanger drops too low, the
pump will start running until the temperature of the heat exchanger
is sufficiently high. If the frost protection intervenes, code
displayed (heating up exchanger).
If the installation (or a part thereof) can freeze, the coldest place
•
should be fitted with an (external) frost thermostat on the return pipe.
This must be connected in accordance with the electrical diagram
(see par. 10.2).
Note
-
When the unit is switched off (
remain active, however a heating request from an (external) frost thermostat will be
ignored.
on the service display), the unit frost protection will
7
will be
8