54
4.2 ELECTRICAL CONNECTION TO THE TERMINAL STRIP
(installer-set)
LAYOUT (A) - Electrical connection P 140-200-300 T/G
burners with direct motor starting
Cables cross-section
LAYOUT (B) - Electrical connection P 300-450 T/G burners
with star-delta motor starting
Cables cross-section
KEY TO LAYOUTS (A) - (B)
I1 - Burner manual stop switch
MA - Star-delta starter terminal strip
MB - Burner terminal strip
PS - Reset push-button
S - Remote lock-out signal
TL - Load limit remote control system:
shut down the burner when the boiler
temperature or pressure reaches the
maximum preset value
TS - Safety load control system:
operateds when TL is faulty
T2 - 2nd stage load control system
T3 - 3rd stage load control system
SCHEMA (C) - Calibration of thermal relay
This is required to avoid motor burn-out in the
event of a significant increase in power
absorption caused by a missing phase.
• If the motor is star-powered, 400 V, the cursor
should be positioned to “MIN”.
• If it is delta-powered, 230 V, the cursor should
be positioned to “MAX”.
If the scale of the thermal relay does not include
rated motor absorption at 400 V, protection is
still ensured.
NOTE
In systems where the run of wiring connecting
the thermostat exceeds 20 metres in length, or
in places where the burner is subject to particu-
larly disturbing electromagnetic interference
(over 10 v/m), you must insert the relay-inter-
face kit item number 3010386.
P 140 T/G P 200 T/G P 300 T/G
230 V 400 V 230 V 400 V 230 V 400 V
FAgG/gL252540256350
Lmm22,5 2,5 4 2,5 6 4
P 300 T/G P 450 T/G
230 V 400 V 230 V 400 V
FAgG/gL50406350
Lmm264106
Emm242,56 4
P 140 - 200 - 300 T/G
DIRECT MOTOR STARTING
D2568
(C)
THERMAL RELAY
(B)
P 300 - 450 T/G
STAR-DELTA MOTOR STARTING
(A)
Check the lock-out by darkening the
photo-cell after removal of the cover.
ATTENTION: HIGH VOLTAGE
Important:
D2570
