9
ELECTRICAL CONNECTIONS (A)
set up by the installer
Use flexible cables according to regulation EN
60 335-1:
• if in PVC boot, use at least H05 VV-F
• if in rubber boot, use at least H05 RR-F.
All the cables to be connected to the burner
sockets 5)(A) must be routed through the fair-
leads, supplied by the manufacturer for insertion
into the holes in the plate, preferably those on
the left side, after having removed the thin dia-
phragm effectively closing the aperture, as al-
ready explained above.
1 - Pg 11 Three-phase power supply
2 - Pg 11 Single-phase power supply
3 - Pg 9
Control device TL
4 - Pg 9
Control device TR
LAYOUT (B)
The RL 28 - 38 Models electrical connection
single-phase 230V power supply
Cable section not indicated: 1,5 mm
2
LAYOUT (C)
The RL 38 - 50 Models electrical connection
three-phase 230/400 V power supply with
neutral phase wire
Cable section not indicated: 1,5 mm
2
Key to wiring layouts (B) - (C)
h1 - 1st stage hourcounter
h2 - 2nd stage hourcounter
IN - Manual burner stop switch
X4 - 4 pole plug
X5 - 5 pole plug
X7 - 7 pole plug
S
- Remote lock-out signal
TL - Limit control device system:
This shuts down the burner when the boiler
temperature or pressure exceeds the set-
point value.
TR - High-low mode control device system:
This controls operating stages 1 and 2 and
is necessary only for two-stage operation.
TS - Safety control device system:
This operates when TL is faulty.
Important:
the burner is factory set for two-
stage operation and it must therefore be con-
nected to the TR remove control device to com-
mand light oil valve V2.
Alternatively, if single stage operation is
required, instead of control device TR install a
jumper lead between terminals T6 and T8 of
connector X4.
LAYOUT (D)
Calibration of thermal cut-out 17)(A)p.3
This is required to avoid motor burn-out in the
event of a significant increase in power absorp-
tion caused by a missing phase.
• If the motor is star-powered,
400 V
, the cursor
should be positioned to "MIN".
• If the motor is delta-powered,
230 V
, the cur-
sor should be positioned to "MAX".
Even if the scale of the thermal cut-out does not
include rated motor absorption at 400 V, protec-
tion is still ensured in any case.
NOTES
• Burners RL 38 three-phase and RL 50 leave
the factory preset for 400 V power supply. If
230 V power supply is used, change the motor
connection from star to delta and change the
setting of the thermal cutout as well.
• The RL 28 - 38 - 50 burners have been type-ap-
proved for intermittent operation. This means
they should compulsorily be stopped at least
once every 24 houres to enable the control box
to perform checks of its own efficiency at start-
up. Burner halts are normally provided for auto-
matically by the boiler load control system.
WARNING:
Do not invert the neutral with the phase
wire in the electricity supply line.
(A)
(B)
(D)
ELECTRICAL CONNECTIONS
RL 38 - RL 50 three-phase
CALIBRATION OF THEREMAL RELAY
RL 28 - RL 38 single-phase
(C)
ELECTRICAL CONNECTIONS
RL 38 three-phase - RL 50
D465
D3232
D3228
D867
ELECTRICAL CONNECTIONS
