39
DESCTIPTION OF COMPONENTS
GB
GB
GB
GB
8. LOGIC OF OPERATION
Attention
the Additional Generator (any external heat source) must be
provided with specific overtemperature and pressure safety devices posi-
tioned near the same, adequately protecting the system from temperature
peaks and pressure avoiding damages to things and/or injuries to persons.
Note.
The electrical connections above refer to the use of the mixing valve
0-10 V Code 28157220 when supposed to be a 1KW resistor, to convert the
segment 0-20 mA to ter and -, the 0-10V signal useful to the valve.
8.16 Anti-freeze protection
The antifreeze function involves the activation of Pump 1 circulator and/
or the starting of the heat pump in heating mode according to multiple
intervention thresholds, depending on: external temperature, water tem-
perature and activation state.
To ensure the activation of the antifreeze function, it is sufficient for the
heat pump to be electrically powered.
In any case, with installations in particularly cold environments, it is always
advisable to mix the system water with a special anti-freeze solution.
Note:
To change the intervention thresholds of the antifreeze protection, contact
an authorized service centre.
CAUTION
This free contact output (clamp F – L , PCB TERMINAL BLOCK) is active if
the external air temperature has a value below that set in parameter
138
(default=5) for continuous time, through parameter
139
(default=30 min).
The following operation modes are set through parameter
137
:
• Par=2 deactivation of the HP and activation of the Additional Generator
• Par=2 HP and Additional Generator simultaneously active
• Par 137 = 0: additional generator disabled
• Par 137 = one additional generator enabled with PdC that
down in the event of activation of the generator additional rides
• Par 137 = 1 additional generator enabled with PdC that it stays on in the
event of activation of the generator additional rides.
Additional generator is activated only if there is demand for hot water pro-
duction for heating DHW, only if required to the frequency inverter heat
pump
(parameter 117)
is different from zero.
100%
-20
-5
0
+10
+20°C
Capacity
Capacity
Load
Outside air temperature
8.14 Additional generator
Through SMART-MT, it is possible to manage heat with BIVALENT SY-
STEM: activation of an auxiliary generator (e.g. boiler) for DHW production,
with the aim of integrating or replacing, the heat pump operation, during
the periods when the external temperature is very low.
8.15 Valve 0-10 V for underfloor heating
The 0-10V pump must be only used in systems provided with a “HIGH”
temperature (fan coil) and “LOW” temperature (radiant) circuit.
Please contact an authorized service centre for the use of systems provi-
ded with a "HIGH" temperature (fan coil) and “LOW” temperature (radiant)
circuit.
.
