GB / 27
Antifreeze function of the external unit
The main circulator of the external unit starts at the
minimum speed when the measured temperature by
the return water temperature (EWT) sensor is below 7°C
in heating mode or the leaving water temperature (LWT)
sensor is below 10°C in heating mode or below 1°C in
cooling mode.
The main circulator stops when the return water
temperature (EWT) sensor is above 8°C in heating mode
or the leaving water temperature (LWT) sensor is above
10°C in heating mode or above 4°C in cooling mode.
In case of failure of LWT sensor the protection logics is
based on the outdoor temperature sensor (OAT) of the
external unit.
The main circulator starts when the outdoor temperature
sensor is above 7°C in heating mode.
The main circulator stops after 30” or when the outdoor
temperature sensor is above 8°C in heating mode.
This check is repeated every 15 min.
Antifreeze function of the internal unit
The main circulator of the external unit starts at the
maximum speed when the measured temperature by the
CH Flow temperature sensor is below 7°C in heating mode.
If the temperature is still below 9°C after 5 minutes, then the
HP Compressor start at 50% frequency. If the temperature
is still below 9°C after 25 minutes, the resistance is turned
on
The main circulator stops when the CH Flow temperature
sensor is above 9°C in heating mode.
ATTENTION
Anti-freeze function works properly only if:
· System pressure is included between 0.6 and 3 bar
· The system is electrically supplied
• In correspondence of anti-freeze function activatio
request, no errors are occurring
Maintenance
The maintenance of your NIMBUS M system is compulsory
and indispensable in order to ensure an adequate functio-
ning, the safety of the appliance and the duration of life of
the system itself.
General remarks
It is necessary to perform at least once a year the following
checks:
1. Visual control of the general state of the system.
2. Periodically check the water pressure
3. Pressurize the system, when necessary providing an
adequate air purge
4. Adjust the parameters setting and devices in order to
obtain a better functioning and a more economical ma-
nagement of the system
5. Subcontract, as provided by the rules, periodic mainte-
nance
6. Keep clean the front grille and the outdoor unit
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