11
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 water 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 the domestic water storage, if it is not yet at working temperature or below the limit
temperature.
The domestic water storage is maintained at operating temperature by probe S2 and priority
diverter valve V2. The regulator performs thermal disinfection of the domestic water storage
in accordance with four user-selectable preset programs, keeping it for two hours at the
disinfection temperature “Legio.-Temp”, settable in the range 40–75°C. The user can
anyway add further disinfection periods (designated TP points in the menu).
The regulator allows to manage a simple thermal solar circuit connected to the lower coil of
the domestic water storage. When the minimum working temperature of the solar collector
is reached, the temperature difference
Δ
T is checked between probe Sol1 on the solar
collector and probe Sol2 on the lower section of the domestic 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 domestic water storage is reached. The
regulator manages possible overtemperatures of the solar collector by starting pump Psol to dissipate the excess heat.
Sol2
T
C
S2
RT
DCW
DHW
Open vessel
Closed vessel
IHeating
system
Sol 1
Psol
S1
SOLID FUEL
GENERATOR
SOLID FUEL
GENERATOR
DIRECT
INERTIAL
WATER
STORAGE
HEATING
BOILER
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 V2
for domestic priority
5
NC
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
x2 Room thermostat
RT contact
x3 Room thermostat
RT contact
x4 Domestic water
storage probe S2
x5 Domestic water
storage probe S2
S
Sol 2
Sol 1
Psol
wiring to be made
N Neutral common
N Neutral common
S
ON
1 2 3 4
Program
Disinfection
day
Disinfection
time slot
0
No disinfection
1
Mon.
2-4
2
Sat.
10-12
3
Sun.
10-12
4
Mon. and Wed.
2-4
Program 8 (software code PR87)
Heating with direct inertial water storage, domestic hot water production with storage integrated with
solar system
Number of probes utilised: 4
Probe S1 located on the direct inertial water storage flow pipe to the secondary circuits
Probe S2 (pocket not supplied in the pack) located on the domestic water storage
Probe Sol1 (not supplied in the pack) located on the solar collector
Probe Sol2 located on the domestic water storage
