Robur M40 - Scheduled Maintenance and Resets; Troubleshooting Common Issues

Maintenance
32
7
current regulations or, if more restrictive, according
to the provisions set forth by the manufacturer, in-
staller or TAC.
Responsibility for eciency checks, to be carried
out for the aims of restricting energy consumption,
lies with the system manager.
7.2 SCHEDULED ROUTINE
MAINTENANCE
Perform the operations in the following Table 7.1 p.32
on an annual basis.
-
Table7.1 Scheduled routine maintenance
Next-R G K M
Ordinary scheduled maintenance
Check of the unit
clean the burner √ √ √ √
clean the ignition and ame sensor electrodes √ √ √ √
clean the fan √ √ √ √
clean the blower/exhaust fan √ √ √ √
check the % value of CO
2
√ √ √ √
check the unit safety devices √ √ √ √
check that the condensate discharge is clean - √ - -
7.3 RESETTING THE TEMPERATURE LIMIT
THERMOSTAT
The temperature limit thermostat stops the burner in case
of appliance overheating.
The reset of the heater in block by intervention of the limit
thermostat is manual by accessing the electrical panel of
the appliance.
Resetting of the temperature limit thermostat
should be carried out by qualied service per-
sonnel, after removing the cause of overheating.
The intervention of the temperature limit ther-
mostat ALWAYS indicates an abnormal condition.
Before resetting, it is therefore advisable to search
for the reasons that led to the unit overheating. If
frequent stops occur, contact Robur TAC.
7.4 PERIODS OF INACTIVITY
Should you foresee to leave the appliance inactive for a
long period of time, disconnect it from the electrical and
gas mains.
How to deactivate the appliance for long pe-
riods of time
1. Switch the appliance o (Paragraph 6.2 p.30 ).
2. Only when the unit is completely switched o, discon-
nect the power supply using the main switch/discon-
nector (Figure 4.1 p.24 ).
3. Close the gas valve.
How to reactivate the appliance after long pe-
riods of inactivity
Before reactivating the appliance, the operator/
maintenance technician of the system must rst of
all:
 Check whether any maintenance operations are re-
quired (contact the TAC; see Paragraph 7.2 p.32 ).
 Ensure that the ue gas exhaust duct and the air
intake are not obstructed.
After completing the above checks:
1. Open the gas valve and ensure there are no leaks;
should gas smell be noticed, close the gas valve
again, do not switch any electrical devices on and
request intervention by qualied personnel.
2. Provide electrical current with the main power
switch (Figure 4.1 p.24 ).
3. Switch on the appliance by means of the provided
control device (Paragraph 6.2 p.30 ).
7.5 TROUBLESHOOTING
In case of a failure, call a qualied service engineer.
If the gas unit heater does not start in heating mode nor
in ventilation, follow the steps below to identify the most
likely cause of the fault:
1. Disconnect electrical power supply to the gas unit
heater.
2. Check the fuse on the electrical terminal block. If it is
broken, replace it with a suitable one (see electrical da-
ta in Table 1.2 p.14 ).
3. Restore the electrical power supply.
4. Check that the power supply is correct (230 V 1-N 50
Hz).
5. Check static gas supply pressure with respect to values
in Table 3.1 p.18 .
6. Set the summer/winter selector switch to winter posi-
tion, or close contact 1-3 on the terminal block.
7. Switch on Z9 contact using the provided control de-
vice (thermostat, chronothermostat or voltage-free
contact) or by closing Z9 contact on the terminal block.
8. Check that the extractor fan starts. If the extractor fan
does not start:
 Check that the limit thermostat has not been trig-
gered. If this is the case, check the overheating
cause, remove it, and reset the limit thermostat