54
code HG0141.00GB ed.A-2008
LRP - RAPID PRO and LK - KONDENSA
LRP and LK WARM AIR HEATER
HG0140.00_IM_051
Main tank
Secondary tank
Float
housing
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 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 flue gas exhaust and air intake ducts
Visually inspect where possible or use specific tools to check
the status of the ducts.
Remove dust that forms on the air intake terminal.
3) Inspection and cleaning of the Venturi pipe
Remove any dirt at the mouth of the Venturi pipe 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 LRP and LK heaters prevents soot forming,
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 considerable 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 ex-
changer, all the gaskets between the burner and the exchanger
must be replaced.
5) Inspection and cleaning of the trap and condensation
collection tray
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.
Remove the cover retaining screws and clean the internal part
of the trap and the relevant float (it is possible to clean the trap
under running water) by checking that all ducts are free. Check
the seal conditions. Check the integrity of the detection electrode
and use sandpaper to remove any oxidation on the metal part.
Fill in the main tank with clean water and close the cover. Re-
connect the trap to the condensate drain system.
To check that the salts inside the tray are still active, use lit-
mus paper to check that the pH level of water flowing out of is
greater than 6.
If the pH is lower, replace the calcium carbonate present in
the tray.
6) Inspection of intake gas pressure
Check 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 maxi
-
mum heat capacity.
7) Inspection of flame monitoring equipment
With the heater running, close the gas tap and verify that the
machine is locked out, signalled on the LCD display of the CPU
PCB on the machine with F10. Reopen the gas tap, reset the
lockout and wait for the heater to restart.
8) Inspection of the safety thermostat(s)
This procedure must be done with the heater on and the burner lit.
Open the thermostat series with an insulated tool [230 V], re-
move the fast-on from the safety thermostat, wait for the F20
block signal to appear on the LCD display on the CPU PCB
on the machine. Close again the thermostat series, then reset
the lockout.
9) Inspection of 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.
