Roca CRONO 4-G COMPACT Instrucciones De Instalación, Montaje Y Funcionamiento Para El Instalador página 27

5. MAINTENANCE
The burner requires periodic maintenance carried out by a qualified and authorised technician in conform-
ity with legislation and local standards.
Maintenance is essential for the reliability of the burner, avoiding the excessive consumption of fuel and
consequent pollution.
Before carrying out any cleaning or control always first switch off the electrical supply to the
burner acting on the main switch of the system.
THE BASIC CHECKS ARE :
Make sure the air intake tubes and ducts taking the flue gases away do not feature any obstructions or
restrictions.
Measure fuel consumption to ensure it is correct.
Leave the burner working without interruptions for 10 min. set correctly all the components stated in this
manual. Then carry out a combustion check verifying:
Content of CO 2 (%)
6. FAULTS / SOLUTIONS
Below are some examples of causes & possible solutions that could result in the burner failing to operate or
that result in it working incorrectly. A fault usually makes the lock-out lamp light which is situated inside the
reset button of the control box (5, fig. 1, page 1). When lock out lamp lights the burner will attempt to light only
after pushing the reset button. After this if the burner functions correctly, the lock-out can be attributed to a
temporary fault. If however the lock out continues the cause must be determined and the solution found.
BURNER STARTING DIFFICULTIES
FAULTS
T h e b u r n e r d o e s n ' t
s t a r t w h e n t h e l i m i t
thermostat closes.
The burner runs nor-
mally in the prepurge
and ignition cycle and
locks out after about 3
seconds.
3217
Content of CO (ppm)
POSSIBLE CAUSES
Lack of electrical supply.
Lack of gas.
The gas pressure switch does not
close its contact.
The connections in the control box
are wrongly inserted.
The air pressure switch contact is in
the run position when the burner is at
rest.
Phase and neutral connection is
inverted.
Check that the burner earth connec-
tions are well made.
The ionization probe is earthed or not
in contact with the flame, or its wiring
to the control box is broken, or there
is a fault on its insulation to the earth.
Flue gas temperatures.
Check presence of voltage in the L1-N
clamps of the 7 pin plug.
Check the condition of the fuses.
Check that safety thermostat is not
lock out.
Check that the manual gas isolation
valve is open.
Check that the burner gas valves are
wired correctly & that they are opening &
passing gas once energized (Verify this
by using your gas pressure gauge).
Adjust the gas pressure switch to its cor-
rect setting.
Check and connect all the plugs.
Replace the air pressure switch.
Connect them correctly.
Connect them correctly.
Check the right position and if neces-
sary set it according to the instructions
of this manual.
Reset the electrical connection.
Replace the faulty connection.
12 GB
SOLUTION