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Appendix
Wiring Diagram
Vitotronic boiler control
Riello burner
120 VAC, 60 Hz, 2.5 A
Burner
plug-in connector
(male and female)
Primary control connections;
connect blue wire to the following
terminal on the control box:
NG
LP
Fuel
Terminal 7
7
Motorized air damper (gas burner
only)
Low water cut-off
(field supplied, if required)
Heating system ON/OFF switch
120 VAC, installer must provide
15 A overcurrent protection
Receptacle (site)
120 VAC
18
Oil
6
WARNING
Safety high limit aquastats are inside
boiler control. Do not operate burner
without boiler control. Never bypass
LWCO
aquastats.
CAUTION
Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous
operation. Verify proper operation
after servicing.
IMPORTANT
Install the boiler as described in its
technical documentation before
installing or operating the burner.
IMPORTANT
120 VAC is supplied to burner via
plug-in connector. Do not connect
additional 120 VAC to burner.
IMPORTANT
If any of the original wires as supplied
with the appliance must be replaced,
replace with 221°F/105°C rated or its
equivalent. Minimum size 18 AWG.
WARNING
Turn off electric power
supply before servicing.
Contact with live
electric components
can cause shock or
loss of life.
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