Burner Description - Riello RS 70 Installation, Use And Maintenance Instructions

4.10

Burner description

1 Combustion head
2 Ignition electrode
3 Screw for combustion head adjustment
4 Pipe coupling
5 Servomotor controlling the gas butterfly valve and the air
damper valve (by means of an variable profile cam mechanism).
When the burner is not operating, the air damper is fully
closed in order to reduce to a minimum the heat dispersion
from the boiler due to the flue draught which draws air from
the fan air intake.
6 Extensions for slide bars
7 Motor contact maker and thermal relay with reset button
8 Plug-socket on ionisation probe cable
9 Terminal board
10 Cable grommets for electrical wiring (to be carried out by the
installer)
11 Two switches:
- one for "on - off burner"
- one for "1st - 2nd stage"
12 Control box with lockout pilot light and lockout reset button
13 Flame inspection window
14 Minimum air pressure switch (differential type)
15 Slide bars for opening the burner and inspecting the com-
bustion head
16 Gas pressure test point and head fixing screw
17 Air pressure test point
18 Flame sensor probe
19 Air damper
20144609
Technical description of the burner
12 GB
20 Fan air inlet
21 Screw securing fan to pipe coupling
22 Gas input pipe
23 Gas butterfly valve
24 Boiler fixing flange
25 Flame stability disc
Two types of burner failure may occur:
CONTROL BOX LOCKOUT:
if the control box button 12)(red led)(Fig. 4) lights up, it indicates
that the burner is in lockout.
To reset, hold the button down for between 1 and 3 seconds.
MOTOR LOCKOUT:
to release press the button on the thermal relay 7)(Fig. 4).
D3030
Fig. 4