Safety Components; Maintenance Position - Riello COH 280 Installation, Use And Maintenance Instructions

Boiler
Clean the boiler as indicated in the appliance accompanying in-
structions in order to maintain all the original combustion charac-
teristics intact, especially the flue gas temperature and
combustion chamber pressure.
Combustion
In case the combustion values found at the beginning of the inter-
vention do not respect the standards in force or, in any case, do
not correspond to a proper combustion, contact the Technical As-
sistant and have him carry out the necessary adjustments.
Allow the burner to work for 10 min. and then check the
combustion readings with the parameters indicated within the
appliance instruction manual. Then carry out a combustion
check verifying:
– Smoke temperature at the chimney;
– Content of CO (%);
2
– Content of CO (ppm);
– Smoke value according to opacity smokes index according to
Bacharach scale.
9.3

Maintenance position

Disconnect the electrical supply from the burner
by means of the main system switch.
DANGER
Turn off the fuel interception tap.
DANGER
Wait for the components in contact with heat
sources to cool down completely.
To access to the combustion head, the diffuser disc-holder as-
sembly, electrodes and nozzle
 Loosing the fixing nut to the flange and remove the burner
out of the boiler.
 Hook the burner to the flange 1)(Fig. 19), by removing the
blast tube 2) after loosing the fixing screws 3).
 Remove the small cables 4) from the electrodes 5) and the
diffuser disc-holder assembly from the nozzle-holder 6) after
loosing its fixing screw 7).
 Once replacement of the nozzle has been made, screw it
and tighten it as shown in the Fig. 19.
After carrying out maintenance, cleaning or
checking operations, reassemble the hood and all
the safety and protection devices of the burner.
Maintenance
9.2.3

Safety components

The safety components must be replaced at the end of their life
cycle indicated in Tab. F. The specified life cycles do not refer to
the warranty terms indicated in the delivery or payment
conditions.
Safety component
Flame control
Flame sensor
Gas valves (solenoid)
Pressure switches
Pressure adjuster
Servomotor (electronic
cam) (if present)
Oil valve (solenoid) (if
present)
Oil regulator (if present)
Oil pipes/ couplings
(metallic) (if present)
Fan impeller
2
5
4
23 GB
Life cycle
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
15 years
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
10 years or 250.000
operation cycles
10 years
10 years or 500.000 start-ups
Tab. F
3
7
Fig. 19
2902785
1
6