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5.1.3
Electrical wiring to be completed by the
installer
D3238
Fuses and cables cross-section (Fig. 17), see Tab. C.
Cross-section when not indicated: 1.5 mm
TECNO 70-L
230 V
400 V
F
A
T10
T6
2
L
1.5
1.5
mm
The burner is factory set for two-stage operation
and it must therefore be connected to the TR re-
move control device to command fuel valve V2.
WARNING
Alternatively, if single stage operation is required,
instead of control device TR install a jumper lead
between terminal T8 and T6 (Fig. 17).
5.2
Calibration of thermal relay
This is required to avoid motor burn-out in the event of a signifi-
cant increase in power absorption caused by a missing phase.
• If the motor is star-powered, 400V, the cursor should be posi-
tioned to "MIN".
• If the motor is delta-powered, 230V, the cursor should be po-
sitioned to "MAX".
Even if the scale of the thermal cut-out does not include rated mo-
tor absorption at 400V, protection is still ensured in any case.
NOTE
➤ The burners leaves the factory preset for 400V power sup-
ply. If 230V power supply is used, change the fan motor
connection from star to delta and change the setting of the
thermal cut-out as well.
➤ The burners are factory set for two-stage operation and
must therefore be connected to control device TR.
Alternatively, if single stage operation is required, instead of
control device TR install a jumper lead between terminals
T8 and T6 (Fig. 17).
6088
Electrical system
2
.
TECNO 100-L TECNO 130-L
230 V
400 V
230 V
400 V
T16
T10
T16
T10
1.5
1.5
1.5
1.5
Tab. C
Key to layout (Fig. 17)
h1
1st stage hourcounter
h2
2nd stage hourcounter
IN
Manual burner stop switch
MB
Terminal strip
S
Remote lock-out signal
TB
Burner ground (earth) connection
TL
Limit control device system:
This shuts down the burner when the boiler temperature
or pressure exceeds the setpoint 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.
X4
4 pole plug
X7
7 pole plug
16
GB
D867
Fig. 17
Fig. 18
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