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

inch A B
RL 28/M 39 31 / 32 " 24 13 / 16 " 19
RL 38/M 39 31 / 32 " 24 13 / 16 " 19
RL 50/M 39 31 / 32 " 24 13 / 16 " 19
RL 50/M 39 " 24 " 21
31 / 32 13 / 16
H
C
G
inch A
RL 28/M 18
23 / 32
RL 38/M 18
23 / 32
RL 50/M three-phase 18
23 / 32
RL 50/M single-phase -
inch E
RL 28/M 5 "
1 / 2
RL 38/M 5 "
1 / 2
RL 50/M three-phase 5 "
31 / 32
RL 50/M single-phase 5 "
31 / 32
Blast tube: short - long (obtainable with the kit)
(1)
D7640
C lbs
11 / 16 " 86
11 / 16 " 90
11 / 16 " 92
" 94
11 / 16
D88
D
A1 B C
" - 18 " 18
21 / 32 13 / 32
" - 18 " 18
21 / 32 13 / 32
" - 18 " 18
21 / 32 13 / 32
21 " 18 " 18
3 / 16 21 / 32 13 / 32
F G
13 " 2 " 26
27 / 32 1 / 16 15 / 32
13 " 2 " 26
27 / 32 1 / 16 15 / 32
13 " 2 " 26
27 / 32 1 / 16 15 / 32
13 " 2 " 26
27 / 32 1 / 16 15 / 32
D2533
22
D851
(A)
(B)
A1
A
D7632
D
(1)
" 9 " - 13 "
15 /3 2 13 / 16
" 9 " - 13 "
15 /3 2 13 / 16
" 9 " - 13 "
15 /3 2 13 / 16
" 9 " - 13 "
15 /3 2 13 / 16
H
(1)
" - 31 "
3 / 4
" - 31 "
3 / 4
" - 31 "
3 / 4
" - 31 "
3 / 4
(C)
4
BURNER DESCRIPTION (A)
1 Ignition electrodes
2 Combustion head
3 Screw for combustion head adjustment
4 Flame sensor (cad sensor)
5 Screw for fixing fan to flange
6 Servomotor provides adjustment of fuel delivery reg-
ulator and of air damper. When the burner is not op-
erating the air damper is fully closed in order to
reduce heat dispersion from the boiler due to the flue
draft which draws air from the fan suction inlet.
7 Slide bars for opening the burner and inspecting the
combustion head
8 Safety solenoid valve
9 Pump delivery valve
10 Valve on nozzle return
11 Pressure regulator on nozzle return
12 Pump
13 Plate prearranged to drill 4 holes for the passage of
hoses and electrical cables.
14 Air damper
15 Non-drip 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 overload with reset but-
ton (RL 38 - 50/M)
22 Extensions for slide bars 7)
23 Flame safeguard with lock-out pilot light and lock-out
reset button
24 Terminal strip
25 High oil pressure switch
26 Pump pressure adjustment
27 Pressure gauge for pressure on nozzle return
28 Protection (for RL 50/M single-phase burner)
Two types of burner failure may occur:
Flame safeguard lock-out:
If the flame relay 23)(A) push-button lights up, it indi-
cates that the burner is in lock-out.
To reset, press the push-button.
Motor trip (RL 38 - 50/M):
release by pressing the push-button on thermal over-
load 21)(A).
PACKAGING - WEIGHT (B) - Approximate measure-
ments
• The burners are shipped in cardboard boxes with the
maximum dimensions shown in Table (B).
• The weight of the burner complete with packaging is
indicated in Table (B).
MAX. DIMENSIONS (C) - Approximate measurements
The maximum dimensions of the burner are given in (C).
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
1 - Burner head gasket
4 - Screws to secure the burner flange to the boiler
3 / 8 W x 1"
1 - Adaptor G " / " NPT
1 / 8 1 / 8
1 - Instruction booklet
1 - Spare parts list