Notes On The Connections; Principle Diagram - System For Central Heating And The Production Of Domestic Hot Water; Commissioning; Preliminary Checks - Ferroli PREXTHERM RS3 Mode D'emploi

Key to the symbols/components on the wiring diagram
Water outlet temperature
Boiler status/Water temperature instrument
System water pump
Remote start enabling signal
External safety enabling signal
Room thermostat
Boiler ON switch

6.5 Notes on the connections

The panel power cable, type FG7 RN-F 3G1,5,
is already connected as standard to the termi-
nal block. In the event of replacement, make
sure an appropriate cable is used, according to
the legislation in force. The power supply to the
burner is taken directly from the terminal block,
single-phase and with a maximum current
7. PRINCIPLE DIAGRAM - SYSTEM FOR
CENTRAL HEATING AND THE PRODUCTION
DI DOMESTIC HOT WATER (Fig. 16)
The choice and installation of the components
making up the system is left to the expertise of
the installer, who must operate in a workmanlike
manner and according to the legislation in force.
The systems loaded with antifreeze require the
use of water disconnecting devices. It should be
stressed that the diagram in Fig. 16 is a princi-
ple diagram. In the case of different systems,
please contact our After-Sales Service, which
will provide you all the details required.

8. COMMISSIONING

8.1 Preliminary checks

Once having completed the water, electrical and
fuel connections to the boiler, before starting,
check that:
- The expansion vessel and the safety valve (if
required) are connected correctly and cannot
be shut-off.
- The bulbs of the thermostats and the thermo-
meter are secured inside the corresponding
sheaths.
- The turbulators are positioned in all the flues.
input of 3A. The power supply to the system
water pump is taken directly from the terminal
block, single-phase and with a maximum cur-
rent input of 3A. If the current input of the bur-
ner or the pump is higher than envisaged, or
the power supply is three-phase, power relays
must be connected to the outputs on the termi-
nal block. The remote start enabling signal
Key
A Central heating flow outlet
B Central heating return inlet
1 Heat generator
2 Burner complete with shutdown
and control valves
3 Storage heater
4 System manifolds
5 On-off valves
6 Circulating pump
7 Non-return valves
8 System expansion vessel
9 Automatic vent valve
10 Safety valve
11 Softener filter
12 System fill
- The system is filled with water and completely
vented of air.
- The pump or the pumps are working properly.
- The water, electrical, safety device and fuel
connections have been performed in com-
pliance with the national and local legislation
in force.
- The burner is installed according to the
instructions contained in the manual provided
by the manufacturer.
- The mains voltage and frequency are compati-
ble with the rating of the burner and the boi-
ler's electrical equipment.
- 21 -
Burner switch
Pump switch
Test button
1 st burner stage thermostat
2 nd burner stage thermostat
Boiler safety thermostat
allows the boiler to be operated from a distan-
ce. This is jumpered when not used. The exter-
nal boiler safety enabling signal represents a
further contact that is used to stop the burner.
This is jumpered when not used. The room
thermostat contact only controls the water
pump. This is jumpered when not used.
13 Fuel on-off valve
14 Gas pressure stabiliser
15 Manual on-off valve
16 Gas filter
17 Vibration-damping joint
18 Pump
19 Pressure gauge
20 Safety thermostat
21 Control thermostat
22 Three-way cock
23 Pressure switch with manual reset
24 Flow switch
25 Control thermostat
26 Thermostat with manual reset
27 Temperature test socket
28 Temperature control valve
- The system is able to absorb the quantity of
heat that will be produced.
- The recirculating pump is installed, as descri-
bed in par. 5.5.5.

8.2 Starting for the first time

After the positive outcome of the checks descri-
bed in the previous paragraph, the burner can
be ignited for the first time; this operation must
be performed by a technician who has been
authorised by the Manufacturer of the burner.
The technician has full responsibility as regards
the field of calibration, within the declared and
GB