Lennox eNeRGy Series Installation, Operating And Maintenance page 58

GAS BURNER
Maintenance operations
To keep the machine in efficient condition and guarantee a long lifetime of the heater, it is
advisable to run some inspections every year, before turning it on for the season:
MAINTENANCE DIAGNOSTICGAS BURNER
1. check the status of the start-up electrodes, detection electrodes and pilot flame;
2. check the status of fume exhaust and air intake ducts and terminals;
3. check the status of the venturi;
4. check and clean the exchanger and burner are clean;
5. check and clean the water trap
6. check the intake pressure at the gas valve;
7. check the function of the flame monitoring equipment;
8. check the safety thermostat(s);
9. check the ionization current.
NOTE: Operations at points 1, 2, 3, 4 and 5 must be performed after disconnecting the heater from
the electrical mains and closed the gas intake. Operations at point 6, 7, 8 and 9 must be done with
the heater on.
1) Inspection of electrodes
Dismantle the complete pilot flame and use a jet of compressed air to clean the mesh and nozzle.
Check the integrity of the ceramic and use sandpaper to remove any oxidation on the metal parts
of the electrodes. Check the correct position of the electrodes (see drawing below). It is important
that the detection electrode is at a tangent to the head of the pilot and not inside it. The start-up
electrode must discharge onto the mesh of the pilot burner.
2) Inspection of fume exhaust and air intake ducts
Visually inspect where possible or examine with specific tools to learn the status of the ducts.
Remove dust that forms on the air intake terminal.
3) Inspection and cleaning of the venturi
Remove any dirt at the mouth of the venturi with a brush, and be careful to not let it fall inside the piece.
4) Inspection and cleaning of the exchanger and burner
Perfect combustion in PCH heaters prevents dirt, which is normally caused by bad combustion. It is advisable, therefore, to not clean
the exchanger and burner unless there are exceptional circumstances.
An accumulation of dirt inside the exchanger could be revealed by a sizeable variation in the gas capacity that is not caused by
improper functioning of the gas valve.
Should it become necessary to clean the burner and/or exchanger, all of the gaskets mounted between the burner and the exchanger
must be replaced.
5) Inspection and cleaning of the water trap
Clean the trap every year, and check the connections. Make sure there are no traces of metallic residue. If metallic residue has formed,
increase the number of inspections.
6) Inspection of intake gas pressure
Verify that the intake pressure at the valve corresponds to the value required for the type of gas that you are using.
This verification must be done with the heater on at the maximum heat capacity.
7) Inspection of flame monitoring equipment
With the heater operating, close the gas tap and verify that the machine blocks, signaled on the LCD display on the CPU PCB on the
machine with code F10. Reopen the gas tap, reset the block and wait for the heater to start back up.
8) Inspection of safety thermostat(s) and air pressure gauges
This procedure must be done with the heater on and the burner lit. Open the thermostat series with an insulated tool [230 V], remove
the fast-on from the safety thermostat, and wait for the F20 block signal to appear on the LCD display on the CPU PCB on the machine.
Reclose the thermostat series, then reset the block.
9) Verify the ionization current.
This procedure can be done directly from the LCD display by entering into the I/O menu. The IOn parameter indicates the value of the
ionization current, and the reading is as follows:
• 100, indicates that the value is more than 2 microAmperes, which is plenty for the equipment to function.
• From 0 to 100, indicates a value from 0 to 2 microAmperes; for example, 35 corresponds to 0.7 microAmperes, which is the
minimum threshold detectable for the flame monitoring equipment.
The value of the ionisation current must not be below 2 micro-Amperes. Lower values indicate: the detection electrode in a bad
position, a rusted electrode or one about to stop functioning
eNeRGy-IOM-2020.12-EN
• •
58