Pilot - Gas Train Connection; Electrical Wiring; Supply Cables And External Connections Passage - Riello DB 20 SM HS C03 TC A0 FS1 FB T150 Installation, Use And Maintenance Instructions

6.7.6

Pilot - gas train connection

The burner is fitted with a dedicated gas train that is fixed to the
pipe coupling.
 It should be connected to the main train downstream the fil-
ter or the pressure adjuster (depending on configuration).
6.8

Electrical wiring

Notes on safety for the electrical wiring
 The electrical wiring must be carried out with the electrical supply disconnected.
 Electrical wiring must be made in accordance with the regulations currently in force in the country of destination
and by qualified personnel. Refer to the wiring diagrams.
 The manufacturer declines all responsibility for modifications or connections different from those shown in the wir-
DANGER
ing diagrams.
 Check that the electrical supply of the burner corresponds to that shown on the identification label and in this man-
ual.
 The burner has been type-approved for continuous use.
This means they should compulsorily be stopped at least once every 72 hours to enable the control box to per-
form checks of its own start-up efficiency. Normally, burner stopping is guaranteed by the boiler's thermostat/pres-
sure switch.
 If this is not the case, a time switch should be fitted in series to TL to stop the burner at least once every 72 hours.
Refer to the wiring diagrams.
 The electrical safety of the device is obtained only when it is correctly connected to an efficient earthing system,
made according to current standards. It is necessary to check this fundamental safety requirement. In the event of
doubt, have the electrical system checked by qualified personnel. Do not use the gas tubes as an earthing system
for electrical devices.
 The electrical system must be suitable for the maximum power absorption of the device, as indicated on the label
and in the manual, checking in particular that the section of the cables is suitable for that level of power absorp-
tion.
 For the main power supply of the device from the electricity mains:
- do not use adapters, multiple sockets or extensions;
- make provisions for an omnipolar switch with a gap between the contacts of at least 3 mm (over-voltage cate-
gory III), as required by current safety regulations.
 Do not touch the device with wet or damp body parts and/or in bare feet.
 Do not pull the electric cables.
Before carrying out any maintenance, cleaning or checking oper-
ations:
Turn off the burner's power supply using the main
system switch.
DANGER
Turn off the fuel interception tap.
DANGER
Avoid condensate, ice and water leaks from form-
ing.
DANGER
If the cover is still present, remove it and proceed with the electri-
cal wiring according to the wiring diagrams.
Use flexible cables in compliance with the EN 60 335-1 standard.
Before making any connections, check the electri-
cal system in the appendix of this instruction book-
let.
DANGER
20111775
Installation
Supply pressure 68 ÷ 500 mbar.
WARNING
6.8.1 Supply cables and external connections
passage
All the cables to be connected to the burner are passed through
cable grommets, making holes on the electric box or else using
the holes that have a plug, as shown in Fig. 19.
Key (Fig. 19)
1 Ignition transformer
2 Terminal board
3 Plugs for external inputs
20112489
After carrying out maintenance, cleaning or
checking operations, reassemble the cover and
all the safety and protection devices of the burner.
20 GB
2
3
1
Fig. 19