7
Hydraulic diagrams of programs
Operating principle
The 1522 series regulator automatically manages a system composed of a solid fuel generator, integration gas boiler and inertial water storage
in parallel on the heating system.
On the request of room thermostat RT (not supplied in the pack), the regulator activates the solid fuel generator with priority using contact K
(for generators that can be activated electrically). When the minimum working temperature of the solid fuel generator has been reached (as
detected by probe S1), the regulator starts pump P1, diverts valve V1 to connect the heat exchanger to the system and starts pump P2. With
the solid fuel generator off or not yet at working temperature, the regulator starts 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 solid fuel generator overtemperature, the regulator sends the flow rate of the secondary circuit either to the system (in the
presence of room thermostat demand) or to an optional dissipation system, if present.
The inertial water storage in parallel is managed in accordance with the logic described on page 6. By means of diverter valve V5 (not supplied
in the pack, e.g.: Caleffi 6443..3BY relay box code F29525) the regulator manages all phases of loading and unloading of the water
storage, which is kept closed only if the gas boiler has been activated. Connection of the parallel water storage to the rest of the system is
managed by the regulator by comparing the temperature readings of probes S1 (located on the solid fuel generator flow pipe), S5 (located on
the heat exchanger return line) and S4 (located on the parallel water storage). For probe S5 it is advisable to use the following working
set-points: 45°C for radiator systems, 30°C for radiant panel systems. The gas boiler starts when the solid fuel generator temperature is below
the minimum working temperature TSG (measured by probe S1) and the heat exchanger return temperature TR (measured by probe S5) is 5°C
below the value set on the regulator (TR set, fixed hysteresis value 5K).
Program 4 (software code PR83): BASIC FACTORY PROGRAM
H management of inertial water storage in parallel on the heating system
Number of probes utilised: 3
Probe S1 located on solid fuel generator flow
Probe S5 located on heat exchanger inlet on secondary side of circuit
Probe S4 located on the inertial water storage in parallel on the heating system
ON
1 2 3 4
V5
M
M
S5
D
D
T
P1
P2
C
V1
RT
D
K
S1
K
S1
S4
V4
V5
S5
S4
F29525
K
V4
C
P1 P2
C
V1
S1
RT
-
+
Optimiser
Regulator 152200
V5=Zone valve 6443..3BY
Com.
Relè 1 VA
8 VA
L
N
N
10
Heating system
HEATING
BOILER
Optional
dissipator
Closed vessel
Open vessel
wiring to be made
Wiring diagram
L Live
N Neutral
L’
1
Live jumper
2 ON pump P2
ON pump P1
3’ Gas generator C
3
Gas generator C
N
Neutral common
4
ON diverter valve V1
5
NO
ON diverter valve V4
to optional dissipator
5
NC
6’ Solid fuel generator K
10 ON valve V5 to load the
parallel water storage
N
Neutral common
6’ Solid fuel generator K
y1 Probe S1
y2 Probe S1
y4 Probe S5
y5 Probe S5 and S4
common
y6 Probe S4
x2 Room thermostat
RT contact
x3 Room thermostat
RT contact
SOLID FUEL
GENERATOR
SOLID FUEL
GENERATOR
INERTIAL
WATER
STORAGE
IN PARALLEL
Wiring diagram of F29525
relay box - 230 V ˜ 50 Hz
V5
D
V5
D
