Roca TECNO 190-L Instrucciones De Instalación, Funcionamiento Y Mantenimiento página 39

(A)
CALIBRATION OF THEREMAL RELAY
(B)
RL 190
230 V 400 V
F A T25 T25
L 2 2,5 2,5
mm
8
LAYOUT (A)
TECNO 190L electrical connection three-
phase 230/400 V power supply with neutral
phase wire
Fuses and cables section layout (A), see table.
Key to wiring layouts (A)
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 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:
D3238
This operates when TL is faulty.
X4 - 4 pole plug
X7 - 7 pole plug
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
required, instead of control device TR install a
jumper lead between terminal 11 and 12 of the
terminal strip.
LAYOUT (D)
Calibration of thermal cut-out 16)(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 on "MIN".
• If the motor is delta-powered, 230 V, the cursor
should be positioned on "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.
N.B.
Burner model TECNO 190L leaves 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.
The TECNO 190L burner has been type-
D867
approved for intermittent operation. This means
they should compulsorily be stopped at least
once every 24 hours to enable the control box to
perform checks of its own efficiency at start-up.
Burner halts are normally provided for automati-
cally by the boiler load control system.
If this is not the case, a time switch should be fit-
ted in series to IN to provide for burner shut-
down at least once every 24 hours.
WARNING: Do not invert the neutral with
the phase wire in the electricity supply line.
single stage operation is