Board Replacement; Maintenance And Cleaning - Riello RESIDENCE HM Series Instructions For The User

5.16 Replacing the interface
System configuration operations must be carried out by professionally
qualified personnel of the Technical Assistance Centre.
If the interface card is replaced, the user may be asked to reset the time
and day of the week values at power on (see "5.2 Initial start-up"); also
check and reset, if necessary, information on hourly heating and DHW
programming (see "8.1 Time band scheduling function (room thermostat)
") and the Feeder Bottle function (see "8.12 FEEDER BOTTLE function");
note that no reprogramming of the configuration parameters is necessary,
the value of which is retrieved from the regulation and control board in
the boiler. Instead, it may be necessary to reset the DHW and/or heating
setpoint values.

5.17 Board replacement

If the adjustment and control board is replaced, it may be necessary to
reprogram the configuration parameters. After replacing the board, we
recommend carrying out an initial PAR procedure. Consult the parameter
table to identify the board default values, the factory set values and the
customized ones.
The parameters to necessarily be checked and possibly reset are: P201
● P205 (with boiler in OFF) ● P208 ● P301 ● P302 (SERVICE) ● P306 ●
P307 ● P309 ● P310 ● P507.
Disconnect the boiler from the power supply for at least 10 seconds; then
reconnect to the mains power supply.
Once the replacement is complete, perform a new " GAC " procedure
must be carried out (see chap. 5.4).

6 MAINTENANCE AND CLEANING

Periodic maintenance is an "obligation" required by the law and is es-
sential to the safety, efficiency and duration of the boiler. It allows for the
reduction of consumption, polluting emissions and keeping the product
safe and reliable over time. Before starting maintenance operations:
ƒ turn off the fuel and water taps of the heating and domestic hot water
system.
To ensure product characteristics and efficiency remain intact and to
comply with prescriptions of current regulations, it is necessary to ren-
der the appliance to systematic checks at regular intervals. For mainte-
nance, follow the instructions in chapter "1 WARNINGS AND SAFETY".
This normally means the following tasks:
ƒ removing any oxidation from the burner
ƒ removing any scale from the heat exchangers
ƒ check the state of deterioration of the electrodes and, if they have
deteriorated, replace them together with their seals
ƒ check and general cleaning of exhaust and intake pipes
ƒ checking the external appearance of the boiler
ƒ checking the ignition, switch-off and operation of the appliance, in
both DHW mode and heating mode
ƒ checking the seal on the couplings and the gas/water/condensate
connection pipes
ƒ checking gas consumption at maximum and minimum output
ƒ if the DHW pressure is less than 3 bar, empty the boiler's DHW circuit
and check that the heating circuit pressure is maintained
ƒ checking the integrity of the insulation of electrical cables, particularly
in the vicinity of the primary heat exchanger
ƒ checking the gas failure safety device
ƒ checking there is water in the drain-trap; if not, fill it.
b
When servicing the boiler, the use of protective clothing is
recommended in order to avoid personal injury.
b
After maintenance work has been carried out, an analysis of the
combustion products must be carried out to check that they are
functioning properly.
b
If, after any replacement of electronic board, heat exchanger, fan/
mixer and gas valve, or having carried out maintenance on the
ignition and detection electrodes or on the burner, the flue gas
analysis returns out-of-tolerance values, it is necessary to repeat
the "GAC" procedure (see chap. 5.4).
b
Do not clean the appliance or its parts with inflammable substances
(e.g. petrol, alcohol, etc.).
b
Do not clean panels, painted parts and plastic parts with paint
thinner.
b
Panel cleaning must be carried out only with soapy water.
Cleaning the primary heat exchanger
ƒ Switch off the electrical supply by turning the main system switch OFF.
ƒ Close the gas shut-off valve.
ƒ Remove the casing as explained in paragraph "4.7 Removing the casing".
ƒ Disconnect the connection cable of the ignition and detection elec-
trodes.
ƒ Disconnect the power cables of the fan.
ƒ Remove the clip (A) securing the gas train from the mixer.
ƒ Loosen the gas train nut (B).
ƒ Extract the gas train from the mixer and rotate it.
ƒ Remove the 4 nuts (C) that secure the combustion unit.
ƒ Remove the air/gas conveyor assembly including fan and mixer, tak-
ing care not to damage the insulation panel and electrode.
ƒ Remove the siphon connecting pipe from the condensate drain fitting
of the heat exchanger and connect a temporary collecting pipe. At this
point proceed with the heat exchanger cleaning operations.
ƒ Vacuum out any dirt residue inside the heat exchanger, taking care
NOT to damage the retarder insulating panel.
ƒ Clean the coils of the heat exchanger with a soft bristled brush.
b
DO NOT USE METAL BRUSHES THAT COULD DAMAGE THE
COMPONENTS.
ƒ Clean the spaces between the coils using a 0.4 mm thick blade,
possibly available in kit form.
ƒ Vacuum away any residue produced by the cleaning intervention.
ƒ Rinse with water, taking care NOT to damage the retarder insulating
panel.
b
If there are stubborn fuel gas deposits on the heat exchanger
surface, remove them by spraying with natural white vinegar,
taking care NOT to damage the retarder insulating
ƒ Leave it to work for a few minutes.
ƒ Clean the coils of the heat exchanger with a soft bristled
b
DO NOT USE METAL BRUSHES THAT COULD DAMAGE THE
COMPONENTS.
ƒ Rinse with water, taking care NOT to damage the retarder insulating
panel.
ƒ Make sure the retarder insulation panel is undamaged and replace it
if necessary following the relative procedure.
ƒ After cleaning, carefully assemble the components again repeating
the indications provided above but in the reverse order.
ƒ To tighten the fastening nuts of the air/gas conveyor assembly, use
a tightening torque of 6 Nm, following the sequence indicated on the
die-cast (1,2,3,4).
ƒ Turn the power and gas feeding to the boiler back on.
b
Repeat the "GAC" procedure (see chap. 5.4).
Cleaning the burner
ƒ Switch off the electrical supply by turning the main system switch OFF.
ƒ Close the gas shut-off valve.
ƒ Remove the casing as explained in paragraph "4.7 Removing the ca-
sing".
ƒ Disconnect the connection cable of the ignition and detection elec-
trodes.
ƒ Disconnect the power cables of the fan.
ƒ Remove the clip (A) securing the gas train from the mixer.
ƒ Loosen the gas train nut (B).
ƒ Extract the gas train from the mixer and rotate it.
ƒ Remove the 4 nuts (C) that secure the combustion unit.
ƒ Remove the air/gas conveyor assembly including the fan and mixer,
taking care not to damage the insulating ceramic panel and the
electrodes. At this point proceed with the burner cleaning operations.
ƒ Clean the burner with a soft bristle brush, taking care not to damage
the insulation panel and electrodes.
b
DO NOT USE METAL BRUSHES THAT COULD DAMAGE THE
COMPONENTS.
ƒ Check that the burner insulating panel and the sealing gasket are
undamaged and replace them if necessary, following the relative pro-
cedure.
ƒ After cleaning, carefully assemble the components again repeating
the indications provided above but in the reverse order.
ƒ To close the fixing nuts of the air/gas conveyor assembly, use a tight-
ening torque of 6 Nm.
ƒ Turn the power and gas feeding to the boiler back on.
b
Repeat the "GAC" procedure (see chap. 5.4).
18
panel.
brush.