Appendix - Electrical panel layout
– The electrical connection three-phase 230/400 v power sup-
ply with neutral phase wire
– Cable section not indicated: 1.5 mm
2
Key Fig. 3 - Fig. 4
CMV - Motor contactor
FR - Photocell
h1 - 1st stage hourcounter
h2 - 2nd stage hourcounter
IN - Manual burner stop switch
MV - Fan motor
I1 - Switch: burner off - on
I2 - Switch: 1st - 2nd stage operation
RMO88.53A2 - Control box
RT - Thermal cut-out
S - Remote lock-out signal
TA - Ignition transformer
TB - Burner ground (earth) connection
TL - Limit control device system:
This shuts down the burner when the boiler tem-
perature 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.
V1 - 1st stage solenoid valve
V2 - 2nd stage solenoid valve
VS - Safety solenoid valve
X4 - 4 pole plug
X5 - 5 pole plug
X7 - 7 pole plug
XP1 - Connector for STATUS
XP4 - 4 pole socket
XP5 - 5 pole socket
XP7 - 7 pole socket
the burner is factory set for two-stage operation
and it must therefore be connected to the TR
remove control device to command fuel 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.
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