7
1.1
Operation
1.1.1 Domestic hot water
The 150 litre hot water storage tank in STAINLESS STEEL is
made exclusively from renewable sources with the following
priorities:
1
Solar Thermal Energy (if present);
2
Heat pump.
The domestic hot water prepared in the storage tank always
remains in the boiler before being used. The boiler burner is
activated by the
SIME HOME PLUS
remote control only if the
inlet temperature does not reach the setpoint set by the user.
– The solar thermal system (if present) can prepare the 150
litres of hot water in the storage tank at the maximum tem-
perature of 90°C. The actual energy ratio depends on the
solar rays which the solar collector is subject to. The solar
thermal pump is managed by the solar control unit on the
basis of the storage tank-collector differential temperature
and implements the ANTI-FREEZE COLLECTOR, COOLING
COLLECTOR functions).
– The heat pump prepares 150 litres of hot water in the stora-
ge tank up to the maximum temperature of 50°C.
– The plate heat exchanger allows the heat pump to opera-
te with extremely high COP values also for the preparation
of domestic hot water in addition to reduced restore times.
Management includes activation of the heat pump only
when the storage tank is almost completely depleted of hot
water in order to reduce the number of start-ups to a mini-
mum and to allow the heat pump to operate at low tempe-
ratures (high COP).
– The heat pump manages:
– DHW priority
– priority in the winter and summer (HEATING or DOME-
STIC HOT WATER with maximum time to be set). Priority
is always given to the production of DOMESTIC HOT WA-
TER.
– The ANTI-LEGIONELLA function, includes preparation of
the storage tank at a temperature of 55°C (maintained for
approximately 4 hours) once a week for bacteria sanitisation
(see
“3.4 Time clock” on page 34
).
1.1.2 Heating
– The heating request is made by means of the dry con-
tact (for example, a safety limit microswitch, etc..).
WARNING: the TA1 contact is powered at 230 Vac by the control
unit (see “Wiring diagram” on page 16 )
– The medium-low temperature heating circuit can reach a
maximum delivery temperature of 55°C with only the heat
pump operating.
– The 30 litre inertial storage tank acts as a thermal flywheel
(needed by the heat pump) and hydraulic separator allowing
operation with any flow rate processed by the system. Than-
ks to the specific design, the inertial tank always guarante-
es the best possible working conditions for the heat pump
making it work at the minimum temperature made avai-
lable by the system (no mixing of the return water inside the
inertial storage tank).
– The delivery setpoint can be set by the user at a fixed value
or it can be calculated dynamically by the heat pump on the
basis of the external temperature and the selected climatic
curve.
– System safety thermostat (50°C fixed calibration) to protect
the radiating system at low temperatures.
– The power modulation of the heat pump and the boiler is
calculated by the heat pump and the boiler respectively
at the minimum level necessary to meet the set system
setpoint.
– The defrost function of the heat pump is controlled elimina-
ting almost all temporary comfort loss and compensating
the energy withdrawn from the system with the boiler.
– It is possible to use the parameters in the
SIME HOME PLUS
remote control to set the setpoints of the high and low tem-
perature zone.
– Option of installing a HIGH TEMPERATURE KIT for an addi-
tional heating circuit with delivery temperature up to 80°C.
This circuit is used exclusively by the boiler as the tempe-
ratures are too high for the heat pump to operate. If the
request is made for the boiler to operate together with the
high and low temperature circuits, the boiler will give priori-
ty to the low temperature circuit and will only then meet the
requirements of the high temperature circuit.
1.1.3 Cooling
– Setting the summer mode (cooling) from a summer/winter
selector for the user’s convenience, located near the boiler
(see
“Fig. 7” on page 15
).
– The cooling request is made by means of the dry contact (for
example, a safety limit microswitch, etc..).
– Heat pump operation only in cool mode.
– Fixed system setpoint set by the user on the heat pump con-
trol.
– The power modulation of the heat pump is always adjusted
to the minimum level necessary to meet the set system
setpoint (there is no reduction in the heat pump setpoint in
relation to the system if not necessary).
– 30 litre puffer and pipes with insulation present. The instal-
ler must complete the insulation of the connection points as
indicated in the installation manual.
1.1.4 Anti-freeze function
– Protection activated by each individual generator with acti-
vation of the pumps and valves on the basis of the tempera-
tures detected by the sensors (electrical power is required).
