4
BURNER DESCRIPTION (A)
1 Combustion head
2 Ignition electrode
3 Screw for combustion head adjustment
4 Minimum air pressure switch
(differential operating type)
5 Flame sensor probe
6 Air pressure socket
7 Gas pressure test point and head fixing
screw
8 Screws securing fan to sleeve
9 Slide bars for opening the burner and
inspecting the combustion head
10 Servomotor controlling the gas butterfly
valve and the air damper (by means of a var-
iable profile cam mechanism).
When the burner is stopped, the air damper
will be completely closed to reduce heat loss
due to the flue draught, which tends to draw
air from the fan air inlet.
11 Areas for passage of electric cables
12 Air inlet to fan
13 Gas input pipework
14 Gas butterfly valve
15 Boiler mounting flange
16 Flame stability disc
17 Flame inspection window
18 Power switch for different operations:
automatic - manual - off
Button for:
power increase - power reduction
19 Motor contact maker and thermal cut-out
with reset button (RS 35/M BLU three-phase)
20 Motor capacitor (RS 25/M BLU single-phase)
21 Control box with lockout pilot light and lock-
out reset button
22 Sockets for electrical connection
23 Air damper
24 Plug-socket on ionisation probe cable
25 Guide extensions (long head version)
26 4-pole socket cover (see electrical panel
appendix)
Two types of burner failure may occur:
• CONTROL BOX LOCKOUT:
if the control box 21)(A) pushbutton lights up,
it indicates that the burner is in lockout.
To reset, press the push button.
• MOTOR LOCKOUT
(RS 35/M BLU three-
phase):
three-phase electrical supply; to unblock,
press the thermal relay switch 19)(A).
PACKAGING - WEIGHT (B)
- approximate
measurements
• The burners are shipped in cardboard boxes
with the maximum dimensions shown in
tab. (B).
• The weight of the burner complete with pack-
aging is indicated in tab. (B).
MAX. DIMENSIONS (C)
-
approximate meas-
urements
The maximum dimensions of the burner are
given in (C).
Bear in mind that, in order to inspect the com-
bustion head, the burner must be pulled back.
STANDARD EQUIPMENT
1 - Gas train flange
1 - Flange gasket
4 - Flange fixing screws M 8 x 25
1 - Thermal insulation screen
4 - Screws to secure the burner flange to the
boiler: M 8 x 25
3 - Plugs for electrical wiring
(RS 25-35/M BLU single-phase)
4 - Plugs for electrical wiring
(RS 35/M BLU three-phase)
1 - Instruction booklet
1 - Spare parts list
(A)
(B)
mm
A B
C
kg
RS 25/M BLU
1000
500
485
32
RS 35/M BLU
1000
500
485
33
(1) Blast tube: short-long
mm
A
D
E
F
(1)
H
I
L
O
N
V
M
RS 25/M BLU 442
422
508
230-365
140
305
138
780
84
177
1”
1/2
RS 35/M BLU 442
422
508
230-365
152
305
138
780
84
177
1”
1/2
D88
D3831
(C)
10
11
25
6
7
12
14
13
15
16
26
D3830
D3829
20051363
