Caleffi 1522 - Manual (Page 10)

10
Operating principle
The 1522 series regulator automatically manages a system composed of a solid fuel generator, integration gas boiler and tank-in-tank direct
inertial water storage combined with a solar system.
On the request of the adjustment thermostat TR (not supplied in the pack) located on the water storage, the regulator activates the solid fuel
generator 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 water storage (in the
presence of a demand from adjustment thermostat TR) or to an optional dissipation system, if present.
The regulator allows to manage a simple solar thermal circuit connected to the lower coil of the tank-in-tank inertial water storage.
When the minimum working temperature of the solar collector is reached, temperature difference ΔT is checked between probe Sol1 on the
solar collector and probe Sol2 on the lower section of the tank-in-tank 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 ΔT falls below the set value or when the set temperature
for the tank-in-tank inertial water storage is reached.
The regulator manages possible overtemperatures of the solar collector by starting pump Psol to dissipate the excess heat.
Optional
dissipator
Closed vessel
Open vessel
Sol 1
Psol
Sol 2
Heating system
SOLID FUEL
GENERATOR
SOLID FUEL
GENERATOR
DIRECT
TANK IN TANK
INERTIAL WATER STORAGE
HEATING
BOILER
Wiring diagram
L Live
L’ Live jumper
N Neutral
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 V4
to optional dissipator
5 NC
6’ Solid fuel generator K
6 Solid fuel generator K
10 ON solar circuit pump Psol
y1 Probe S1
y2 Probe S1
y5 Solar water storage
probe Sol2
y6 Solar water storage
probe Sol2
y7 Solar collector
probe Sol1
y8 Solar collector
probe Sol1
x2 Adjustable thermostat
TR contact
x3 Adjustable thermostat
TR contact
S
Sol 2 Sol 1 Psol
wiring to be made
N Neutral common
N Neutral common
ON
1 2 3 4
Program 7 (software code PR86)
Heating with direct inertial water storage with tank-in-tank domestic hot water production, solar system
Number of probes utilised: 3
Probe S1 located on solid fuel generator flow
Probe Sol1 (not supplied in the pack) located on the solar collector
Probe Sol2 located on the tank-in-tank water storage