Hydraulic System - Riello RL 28/M Installation, Use And Maintenance Instructions

7
10
9
6
7
6
+ H
- H
RL 28/M
m Ø mm
10 12
+ 4,0 63 144
+ 3,0 55 127
+ 2,0 48 111
+ 1,0 40 94
+ 0,5 37 86
0 33 78
- 0,5 29 70
- 1,0 25 62
- 2,0 17 45
- 3,0 10 29
- 4,0 - 12
(A)
(B)
A
5
8
4
5
9
B
L m
RL 38 - 50/M
Ø mm
14 10 12 14
150 51 112 150
150 45 99 150
150 39 86 150
150 32 73 144
150 29 66 132
150 26 60 120
133 23 54 108
118 20 47 96
88 13 34 71
58 7 21 46
28 - 8 21
1
2
3
D860
D861
6

HYDRAULIC SYSTEM

FUEL SUPPLY
Double-pipe circuit (A)
The burner is equipped with a self-priming pump
which is capable of feeding itself within the limits
listed in the table at the side.
The tank higher than the burner A
Distance "P" must not exceed 10 meters in order
to avoid subjecting the pumpʼs seal to excessive
strain; distance "V" must not exceed 4 meters in
order to permit pump self-priming even when
the tank is almost completely empty.
The tank lower than the burner B
Pump depression values higher than 0.45 bar
(35 cm Hg) must not be exceeded because at
higher levels gas is released from the fuel, the
pump starts making noise and its working life-
span decreases.
It is good practice to ensure that the return and
suction lines enter the burner from the same
height; in this way it will be less probable that
the suction line fails to prime or stops priming.
The loop circuit
A loop circuit consists of a loop of piping depart-
ing from and returning to the tank with an auxil-
iary pump that circulates the fuel under
pressure. A branch connection from the loop
goes to feed the burner. This circuit is extremely
useful whenever the burner pump does not suc-
ceed in self-priming because the tank distance
and/or height difference are higher than the val-
ues listed in the Table.
Key
H = Pump/fott valve height difference
L = Piping length
Ø = Inside pipe diameter
1 = Burner
2 = Pump
3 = Filter
4 = Manual on/off valve
5 = Suction line
6 = Foot valve
7 = Rapid closing manual valve remote con-
trolled (only Italy)
8 = On/off solenoid valve (only Italy)
9 = Return line
10 = Check valve (only Italy)
HYDRAULIC CONNECTIONS (B)
The pumps are equipped with a by-pass that
connects return line with suction line. The pumps
are installed on the burner with the by-pass
closed by screw 6)(B)p.12.
It is therefore necessary to connect both hoses
to the pump.
The pump will break down immediately if it is run
with the return line closed and the by-pass screw
inserted.
Remove the plugs from the suction and return
connections of the pump.
Insert the hose connections with the supplied
seals into the connections and screw them
down.
Take care that the hoses are not stretched or
twisted during installation.
Route the hoses through the holes in the plate,
preferably using those on the rh side, fig. (B): un-
screw the screws 1), now divide the insert piece
into its two parts 2) and 3) and remove the thin
diaphragm blocking the two passages 4). Install
the hoses where they cannot be stepped on or
come into contact with hot surfaces of the boiler.
Now connect the other end of the hoses to the
suction and return lines by using the supplied
nipples.