Robur Next-R - Troubleshooting; Periods of Inactivity

Maintenance
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7
7.4 TROUBLESHOOTING
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.23 ).
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.29 .
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 limit thermostat has not been trig-
gered. If this is the case, check the overheating cause,
remove it, and reset the limit thermostat (procedure
Paragraph 7.3 p.49 ).
9. Check that the blower starts. If the blower does not
start:
 Check the presence of voltage at the blower. If the
voltage is present but the blower does not start,
disconnect blower control cable. If the blower
starts, proceed to the next step, otherwise replace
the blower.
 Check the correct operation of the pressure switch
and of its connection pipe (except for R15 and R20
models). If it is stuck, replace it. Otherwise, check
the correct installation of ue gas exhaust and air
intake ducts (likely excessive pressure drops).
10. After 40 seconds from blower start, check the elec-
trodes for sparks. If the electrodes do not spark:
 Check connection cable.
 Check the ignition box fuse. If it is broken, replace
it.
 If the fuse is intact but the electrodes do not spark,
check that the ignition box gives consent to the
transformer (contacts J7, see wiring diagram
Paragraph 1.4 p. 20 ). In this case, replace the
transformer, if not, replace the ignition box.
11. If the burner starts but stops immediately after
sparking:
 Check that the phase and the neutral of the power
supply are not reversed.
 Check the position and the integrity of the detec-
tion and ignition electrodes and, if necessary, re-
place them.
12. If the burner does not start or no gas ows from it:
 Check gas supply.
 If gas is being supplied, check the gas valve for
voltage during sparkling. If the correct voltage is
applied and the blower is running, check that the
nozzle is not obstructed. If the nozzle is free, re-
place the gas valve.
 If the gas is still being supplied, but no voltage is
supplied to the gas valve, check the ignition box
fuse. If it is broken, replace it, otherwise replace the
ignition box.
13. After the burner ignition, check that the fan starts
(wait a few minutes):
 If it does not start, check the correct operation of
the fan thermostat (except for R15 and R20 mod-
els) and, if necessary, replace it. For R15 and R20
models, check the ignition box fuse. If it is broken,
replace it, otherwise replace the ignition box.
 Check the fan motor condenser and, if necessary,
replace it.
 If this does still not solve the problem, replace the
fan motor.
7.5 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.46 ).
2. Only when the appliance is completely o, power
it o with the main switch/disconnector switch
(Detail GS in Figure 4.1 p.36 ).
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.49 ).
 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. Power on with the main power supply switch (GS,
Figure 4.1 p.36 ).
3. Switch on the appliance by means of the provided
control device (Paragraph 6.2 p.46 ).