Unit installation

Ed. 05/2009
User, Installation and Service Manual for F1 Gas Unit Heaters 28
WARNING
Only qualified service engineer authorised by Manufacturer must carry out the operation of
servicing and maintenance.
OPERATING FAILURES
Before looking for possible failures, check:
• Correct power supply: 230 V ±10%, 50Hz and adequate grounding.
• Correct Gas supply
• Piping pressure losses within the limits recommended by the manufacturer. Pressure
losses higher than limits will result in insufficient gas inlet. Causes for this may be the
following:
Natural Gas unit:
a) Poor gas meter performance.
b) The length of the pipes and the number of elbows are excessive with respect to the diameter.
LPG unit:
a) After the first stop of the burner it can not be ignited again. It can be caused by insufficient flow
of the pressure governor.
b) If the required pressure is not reached, it may be caused by insufficient gas flow directed from
LPG tank, or the length of the pipes and the number of elbows are excessive regarding its
diameter.
Only at this point proceed with the specific trouble shooting.
WARNING
Before opening the electric panel door, cut off the power supply to the unit by use of omnipolar
switch.
TYPES OF FAILURES AND SERVICING
In case of a failure, call a qualified service engineer.
CASE N°1
The unit locks out during the first ignition phase.
a) The ignition electrodes are broken or badly positioned.
b) The flame sensor is broken or incorrectly positioned or touches some metal part of the unit.
c) Failure in the flame control unit or in its electrical connections.
d) Failure in the gas valve or in its electrical connections.
e) Not efficient grounding installation
f) Air is inside the gas pipes.
g) Wrong adjustment of the gas pressure on the burner.
CASE N°2
The unit locks out during operation.
a) The gas supply is suddenly cut off due to a failure in the gas system. The ignition control
repeats the ignition cycle, after which the gas valve closes locking out the unit (accidental gas
inlet cut off).
b) The power supply is suddenly cut off due to a failure in the electrical supply mains. If the
electrical cut off period is prolonged, the temperature limit thermostat (M1) locks out the unit,