17
APPENDIX 2
The burners RX 180 S/PV - RX 250 S/PV have been approved for intermittent operation. This means they should be compulsorily stopped at
least once every 24 hours to enable the control box to perform a check of its own efficiency at start-up. Normally, the stopping of the burner is
guaranteed by the boiler's thermostat/pressure switch. If this is not the case, a time switch should be fitted in series to IN to provide for burner
shut-down at least once every 24 hours.
MODULATING OPERATION
If the output power regulator kit RWF40 or the converter 0...10V / 4...20mA is connected, in 3-point signal, the thermostat/pressure switch TR
must be removed.
Using just the regulator RWF 40 also remove the TL thermostat/pressure switch.
IONISATION CURRENT
The minimum current necessary for the control box operation is 5 µA.
The burner gives a much higher current, meaning that checking is not usually required.
Should you want to measure the ionization current anyway, you must open the connector (CN1) inserted in the red wire and insert a microam-
meter.
ATTENTION:
- Do not invert the neutral with the phase in the electrical supply line. An inversion would lead to lockout due to ignition
failure.
- Replace the components only with original spare parts.
NOTE
Probe
Connector
Control-box
D5006
!
D7799
Electrical connections
NOTES
The electrical wirings must be carried out in conformity
with the regulations in force in the countries of destina-
tion, and by qualified personnel.
Riello S.p.A. cannot accept any responsibility for modifi-
cations or connections other than those shown in these
diagrams.
Use flexible cables and external switches in accordance
with the regulation EN 60 335-1.
All the cables to be connected to the burner must pass
through cable grommets.
The use of cable grommets can take various forms; the
following way is just one possible solution:
RX 180 S/PV
1-
7-pole socket for single-phase power supply, thermostat/
pressure switch TL
2-
4-pole socket for thermostat/pressure switch TR
3-
2-pole socket for device enabling the remote reset of the
control box
4 - 4A
Fittings for pipe unions
(Pierce, if it is necessary to use the pipe unions 6A)
RX 250 S/PV
1-
7-pole socket for single-phase power supply, thermostat/
pressure switch TL
2-
4-pole socket for thermostat/pressure switch TR
3-
2-pole socket for device enabling the remote reset of the
control box
4 - 4A
Fittings for pipe unions
(Pierce, if it is necessary to use the pipe unions 6A)
