Unical PELLEXIA 80, Instructions For Installation, Use And Maintenance Manual

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34
CALDAIA PELLEXIA
VASO
ESPANSIONE
POMPA 4
RICIRCOLO
POMPA 3
IMPIANTO
RISCALDAMENTO
VALVOLA
MISCELATRICE
MANUALE
POMPA 2
BOLLITORE
POMPA 1
CIRCUITO
SOLARE
VE1
S 4
S 5
S 0
SCAMBIATORE AD
ACCUMULO
S 3
S 2
3.11.5 - PELLEXIA BOILER SYSTEM FOR HEATING AND FOR THE PRODUCTION OF
DOMESTIC HOT WATER, WITH SOLAR SYSTEM
This diagram shows a stratification heat storage tank for the
production of domestic hot water.
The diagram shows the
P4 recirculation pump, the P3 heat-
ing system pump, the P2 storage tank pump, and the P1 solar
panel pump.
NB: The P4 recirculation and balancing pump is essential;
it serves the purpose of balancing the flow and return tem-
perature of the boiler and adds cold water when necessary
to prevent the risk of condensation. A mixing valve is es-
sential in several areas of the system.
This configuration requires the S3 , S2 and S0 probes for the
use of solar panels.
The
P2
storage tank pump is enabled when the boiler tempera-
ture (the
S4
probe) is above the minimum boiler temperature
(normally 60°C).
The
P2 storage tank pump is enabled when the S4 boiler flow
probe detects a temperature above that of the
S2
probe plus a
heat differential (normally 6°C).
Running the heating system:
In this configuration, the
P3
heating system pump is connected
directly to the storage tank and depends, therefore, not on the
boiler temperature but on the temperature of the storage tank.
The
S3 probe controls the heating circuit.
If the temperature of the storage tank is, therefore, equal to or
greater than the minimum temperature, the input chronother-
mostat enables the heating system pump even when the boiler
is cold.
The
S0 probe needs to be enabled to run the solar circuit.
Sensor legend:
S0 : panel temperature sensor
S2
: temperature sensor at base of storage tank
S3
: temperature sensor at top of storage tank
S4 : flow temperature sensor of the boiler
: return temperature sensor of the boiler
ATTENTION:
In the case of a system with closed expan-
sion vessel, the installer must assemble a
minimum/maximum water pressure switch
and the safety heat exchanger.
PELLEXIA BOILER
EXPANSION
VESSEL
HEATING SYSTEM
PUMP 3
BOILER PUMP 2
MANUAL
MIXING VALVE
SOLAR
CIRCUIT
PUMP 1
RECIRCULATION
PUMP 4
STORAGE
EXCHANGER