Burner Description; Packaging - Weight; Max. Dimensions; Standard Equipment - Riello RL 28/M Installation, Use And Maintenance Instructions

(A)
mm A B
RL 28/M 872 550
RL 38/M 872 550
RL 50/M 872 550
(B)
mm A B
RL 28/M 476 474
RL 38/M 476 474
RL 50/M 476 474
(1) Blast tube: short - long
(C)
20119452
D852
C kg
540 39
540 41
540 42
D
C E
(1)
468 241 - 351 140
468 241 - 351 140
468 241 - 351 152
D851
D88
D452
H
F G
(1)
352 52 672 - 807
352 52 672 - 807
352 52 672 - 807
3
BURNER DESCRIPTION (A)
1 Ignition electrodes
2 Combustion head
3 Screw for combustion head adjustment
4 Photocell for flame presence control
5 Screw for fixing fan to flange
6 Servomotor provides adjustment of fuel deliv-
ery regulator and of air gate valve. When the
burner is not operating the air gate valve is
fully closed in order to reduce heat dispersion
from the boiler due to the flue draught which
draws air from the fan suction inlet.
7 Slide bars for opening the burner and inspect-
ing the combustion head
8 Pump delivery valve (safety valve)
9 Pump delivery valve
10 Valve on nozzle return
11 Oil pressure switch
12 Pump
13 Plate prearranged to drill 4 holes for the pas-
sage of hoses and electrical cables.
14 Supplementary air gate valve
15 Nozzle holder
16 Fan pressure test point
17 Boiler mounting flange
18 Flame stability disk
19 Flame inspection window
20 Power switch for different operation:
automatic - manual - off
Button for:
power increase - power reduction
21 Motor contactor and thermal cut-out with re-
set button (RL 38 - 50/M)
22 Motor capacitor (RL 28/M)
23 Control box with lock-out pilot light and lock-
out reset button
24 Terminal strip
25 Air gate valve
26 Pump pressure adjustment
27 Pressure gauge for pressure on nozzle return
28 Pressure regulator on nozzle return
29 Extensions for slide bars 7)
Two types of burner failure may occur:
Control Box Lock-out:
if the control box 23)(A) pushbutton lights up, it
indicates that the burner is in lock-out.
To reset, press the pushbutton.
Motor trip (RL 38 - 50/M):
release by pressing the pushbutton on thermal
relay 21)(A).
PACKAGING - WEIGHT (B) - Approximate
measurements
• The burners are shipped in cardboard boxes
with the maximum dimensions shown in Table
(B).
• The weight of the burner complete with pack-
aging is indicated in Table (B).
MAX. DIMENSIONS (C) - Approximate meas-
urements
The maximum dimensions of the burner are giv-
en in (C).
Bear in mind that inspection of the combustion
head requires the burner to be opened and the
rear part withdrawn on the slide bars.
The maximum dimension of the burner, without
casing, when open is give by measurement H.

STANDARD EQUIPMENT

2 - Flexible hoses
2 - Gaskets for flexible hoses
2 - Nipples for flexible hoses
1 - Thermal insulation screen
2 - Extensions 29)(A) for slide bars 7)(A)
(for models with 351 mm blast tube)
4 - Screws to secure the burner flange to the
boiler M 8 x 25
3 - Fairleads for electrical connections
(RL 28/M)
4 - Fairleads for electrical connections
(RL 38 - 50/M)
1 - Instruction booklet
1 - Spare parts list