INSTRUCTIONS FOR THE FIRST TIME IN SERVICE
RK 100 - RAD - ING - MAN.INST - 1311.1 - DIGITECH CS MIAH4
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4.5 Frost Protection
4.5.1 General warnings
The boiler is protected from freezing by electronic board settings and special functions that provide the starting of
the burner to heat all the interested parts, when their temperature drops below the minimum preset values,
protecting the boiler up to an external temperature of -10°C.
The device operates as follows:
The heating circuit water temperature drops below 5 °C, the burner is automatically switched ON until the water
reaches a temperature of 30°C.
The domestic hot water temperature drops below 4°, the burner is automatically switched ON until the water
reaches a temperature of 8°C.
The system operates even if the boiler is in OFF mode, as long as it is electrically powered (230 V) and
the gas supply is open.
In case of long periods of inactivity, it is recommended to empty the boiler and the hydraulic system.
Warning for the service technician
In case of a boiler locked out because of freezing, before putting it into operation, make sure that any part is
blocked by ice (heat exchanger, pump, etc.).
Warning for the installer
In case of an outdoor boiler installation, where temperatures can drop below -10°C, it is recommended to fill the
hydraulic system with an antifreeze inhibitor (see below Table for the dilution percentage) and to install a Heating
elements kit (code 82259LP).
4.5.2 Heating elements Kit installation and wiring
Please proceed as follows:
a.
Switch OFF the power supply at the main switch;
b.
Position the 4 resistances onto the heating flow pipe, heating return pipe, (with the exception of the gas
pipe).
c.
Protect the pipes with isolating material;
d.
Connect the thermostat to the heating flow pipe using the supplied clip;
e.
Connect the power supply cables to the terminal board located onto the control panel and following the
wiring instruction;
f.
Secure the cables between them using the supplied clamps.
Table
Antifreeze
Temperature
Ethylene glycol
(%) volume
freezing point
(°C)
boiling point
(°C)
10 -
4
101
20 -
10
102
30 -
17
104
40 -
27
106
50 -
40
109
60 -
47
114
Recommended Glycol 20% percentage for temperatures up to -10°C.