24
7.4 COMBUSTION ANALYSIS TEST
To carry out the combustion analysis, proceed as follows:
- open the hot water tap to its maximum output
- set the mode selector to summer and the domestic hot water
temperature selector to the maximum value
- remove the screw of the combustion analysis inlet cover
and insert the probes
- power the boiler
The appliance works at maximum output and it is possible to
check combustion.
After analysis is complete:
- close the hot water tap
- remove the probe from the analyser and close the
combustion analysis inlet fastening carefully the screw
previously removed.
7.5 CHECKING THE EXPANSION VESSEL
Carry out the component removal procedure as described in
6.4. You must ensure that the boiler is completely drained of
water. Using a suitable pressure gauge, remove dust cap on
expansion vessel and check the charge pressure. The correct
charge pressure should be 1.0 bar ± 0.1 bar. If the charge
pressure is less, use a suitable pump to increase the charge.
NOTE
You must ensure the drain valve is in the open position whilst
re-charging takes place. Replace the dust cap and carry out the
relevant commissioning procedure (section 5).
7.6 EXTERNAL FAULTS
4.4 Light signals and faults
The control panel has two led that indicate the boiler operating
status:
Green led
Flashing
- Flashing with frequency 0.5 second on - 3.5 seconds off =
boiler in standby, there is no flame.
- Flashing with frequency 0.5 second on - 0.5 second off =
temporary stop of the appliance due to the following self-
restoring faults:
- water pressure switch (standby time 10 minutes
approximately)
- differential air pressure switch (standby time 10 minutes
approximately)
- transitory waiting for ignition.
In this phase, the boiler waits for restoration of working
conditions. If after standby time, the boiler will not restore regular
operation, stop will be permanent and light signalling will be
red.
- Fast flashing (frequency 0.1 sec. on; 0.1 sec. off; duration
0.5) input/output function S.A.R.A. (Italian acronym for
Environment Automatic Adjustment System)
By setting the heating water temperature selector to the
area marked by AUTO - temperature value from 55 to 65°C
- the S.A.R.A. self-adjusting system is activated: the boiler
varies the delivery temperature according to the closing
signal of the ambient thermostat. When the temperature set
with the heating water temperature selector is reached, a
20 minutes count begins. If during this period the ambient
thermostat still requests heat, the value of the set tempera-
ture automatically increases by 5°C.
When the new value is reached, other 20 minutes count
begins.
If during this period the ambient thermostat still requests
heat, the value of the set temperature automatically
increases by 5°C.
This new temperature value is the result of the temperature
set manually with the heating water temperature selector
and the increase of +10°C of the S.A.R.A function.
After the second increasing cycle, the temperature value is
restored to the value set by the user and the above
mentioned cycle is repeated until the ambient thermostat
request is fulfilled.
Fixed green
if there is flame, the boiler works regularly.
Red led
The red led indicates a boiler lockout due to the following
faults:
Fixed
- flame lockout
- air pressure switch intervention (after transient phase)
- NTC heating probe
- ACF electronic fault alarms
Flashing
- limit thermostat intervention
To reset operation, place the mode selector on OFF/stand-by,
wait 5-6 seconds and take it then to the desired position:
summer or winter mode.
If the boiler does not restore normal operation, contact the
Technical Assistance Service.
Green flashing led + red flashing led
When the LEDs flash
simultaneously
it is a domestic water
probe alarm and water pressure switch alarm (after transient
phase). The boiler works regularly, but stability of the domestic
hot water temperature is not guaranteed.
Contact the Technical Assistance Service for a control.
When the LEDs flash
alternatively
it means that there is a
calibration procedure in progress.
7.7 ELECTRICAL CHECKS
Any electrical checks must be carried out by a suitably qualified
person.
7.7.1 EARTH CONTINUITY TEST
Isolate the appliance from the electrical supply, and using a
suitable multi-meter carry out a resistance test. Connect test
leads between an appliance earth point and the earth wire of
the appliance supply cable. The resistance should be less than
1 OHM. If the resistance is greater than 1 OHM check all earth
wires and connectors for continuity and integrity.
7.7.2 SHORT CIRCUIT CHECK
Isolate the appliance from the electrical supply, and using a
suitable multi-meter, carry out a short circuit test between the
Live & Neutral connections at the appliance terminal strip.
Repeat above test on the Live & Earth connections at the
appliance terminal strip.
NOTE
Should it be found that the fuse has failed but no fault is
indicated, a detailed continuity check will be required to trace
the fault. A visual inspection of components may also assist in
locating the fault.
7.7.3 POLARITY CHECK
With the appliance connected to the electrical supply and
using a suitable multimeter, carry out the following voltage
tests:
•
connect test leads between the Live & Neutral connections
at the appliance terminal strip. The meter should read
approximately 230V ac. If so proceed to next stage. If not, see
7.7.4.
•
connect test leads between the Live & Earth connections at
the appliance terminal strip. The meter should read
approximately 230V ac. If so proceed to next stage. If not, see
7.7.4.
•
connect test leads between the Neutral & Earth connections
at the appliance terminal strip. The meter should read
approximately 0 – 15Vac. If so polarity is correct. If not, see
7.7.4.
7.7.4 REVERSED POLARITY OR SUPPLY FAULT
Repeat the above tests at the appliance isolator, if testing
reveals correct polarity and/or supply at the isolator, re-check
wiring and connections between the isolator and the appliance.
If tests on the isolator also reveal reversed polarity or a supply
fault, consult the local electricity supplier for advice.
