12
Operating principle
Adjustment thermostat TR (not supplied in the pack) keeps the direct inertial water storage at working temperature by activating the solid fuel
generator.
On request of the room thermostat RT (not supplied in the pack), 1522 series regulator draws energy by priority from the direct inertial water
storage. When the water storage minimum working temperature has been reached (read by probe S1), the regulator starts pump P1, diverts
valve V1 to connect the heat exchanger to the heating system and starts pump P2. If the water storage is not at working temperature, the
regulator activates the integration boiler by means of contact C, stopping pumps P1 and P2 and diverting diverter valve V1 to the boiler.
In the case of direct inertial storage overtemperature, the regulator sends the flow rate of the secondary circuit either to the system (in the
presence of a room thermostat demand) or to an optional dissipator, if present.
When a domestic user tap is opened, on a signal from flow switch F, the regulator operates priority valve V3 to produce instantaneous hot water
with the direct inertial storage only if the latter is at working temperature. Probe S3 reads the water temperature at the domestic heat exchanger
outlet and, if necessary, the regulator integrates the domestic hot water by supplying it to the gas boiler by means of a diverter valve (not
supplied in the pack, e.g. SOLARINCAL kit code 265359).
The regulator allows to manage a simple thermal solar circuit connected to the lower coil of the direct inertial water storage. When the solar
collector minimum working temperature is reached, temperature difference
Δ
T is checked between probe Sol1 on the solar collector and probe
Sol2 on the lower section of the direct inertial water storage: if higher than the set value solar circuit pump Psol is started. Pump Psol continues
to run for a selectable minimum time period and it stops if
Δ
T falls below the set value or when the set temperature for the direct inertial water
storage unit is reached. The regulator manages possible overtemperatures of the solar collector by starting pump Psol to dissipate the excess
heat.
RT
Wiring diagram
L Live
N Neutral
L’ Live jumper
1 ON pump P1
2 ON pump P2
3’ Gas generator C
3 Gas generator C
4 ON diverter valve V1
5
NO
ON diverter valve V3
for domestic priority
5
NC
ON diverter valve V3
to heating system
RT
7 SOLARINCAL with
flow to user
8 SOLARINCAL with
flow to domestic
integration
9 On diverter valve V4
10 ON solar circuit
pump Psol
y1 Probe S1
y2 Probe S1
y5 Solar water storage
probe Sol 2
y6 Solar water storage
probe Sol 2
y7 Solar collector
probe Sol 1
y8 Solar collector probe
Sol 1, ON flow switch
y9 ON flow switch
x2 Room thermostat
RT contact
x3 Room thermostat
RT contact
x4 Probe S3 on
domestic exchanger
outlet
x5 Probe S3 on
domestic
exchanger outlet
Sol 2
wiring to be made
V4
SOLID FUEL
GENERATOR
SOLID FUEL
GENERATOR
Open
vessel
Closed
vessel
C
F
S3
RT
Heating system
Domestic
water
system
SOLARINCAL
DHW
D
Optional
dissipator
S1
Sol 1
Psol
DIRECT
INERTIAL
WATER
STORAGE
N
Neutral common
HEATING
BOILER
ON
1 2 3 4
Program 9 (software code PR88)
Heating with direct inertial water storage integrated with solar system, instantaneous domestic hot
water production
Number of probes utilised: 4
Probe S1 located on the direct inertial water storage flow pipe to the secondary circuits
Probe S3 located on domestic heat exchanger outlet
Probe Sol1 (not supplied in the pack) located on the solar collector
Probe Sol2 located on the direct inertial water storage
