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8.7
ELECTRICAL CHECKS
Any electrical checks must be carried out by a suitably quali-
fied person.
8.7.1 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.
8.7.2 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 ap-
pliance terminal strip.
NOTE
Should it be found that the fuse has failed but no fault is indi-
cated, a detailed continuity check will be required to trace the
fault. A visual inspection of components may also assist in
locating the fault.
8.7.3 POLARITY CHECK
With the appliance connected to the electrical supply and us-
ing 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 8.7.4.
• 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 8.7.4.
• connect test leads between the Neutral & Earth connections
at the appliance terminal strip. The meter should read approxi-
mately 0 – 15Vac. If so polarity is correct. If not, see 8.7.4.
8.7.4 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.
8.7.5 RESISTANCE TO EARTH CHECK
Isolate the appliance from the electrical supply, and using a
suitable multi-meter carry out a resistance test. Connect test
leads between the Live & Earth connections at the appliance
terminal strip. If the meter reads other than infinity there is a
fault that must be isolated, carry out a detailed continuity check
to identify the location of the fault.
These series of checks must be carried out before attempting
any faultfinding procedures on the appliance. On completion
of any task that required the disconnection and re-connection
of any electrical wiring or component, these checks must be
repeated.
8.8
FAULT FINDING
Before attempting any fault finding, the electrical checks as
detailed in 8.7 must be carried out. Isolate the appliance from
the electrical supply.
Disconnect any external controls from terminal plug (CN5 fig.
41), and insert a link-wire between the two wires at the 'TA'
connections.
NOTE
Restore the electrical supply to the boiler and turn the selector
switch to the on position. The boiler should now function as
described in section 8. Should the boiler fail to respond, the
internal fuses and connectors should be checked to ensure
integrity and continuity.
38
8.9
COMPONENT VALUES &
CHARACTERISTICS
COMPONENT
Fan
Pump
Ignition transformer
Gas valve
Room thermostat connection
NTC thermistor (dry contact)
NTC thermistor (wet contact)
FUNCTION
Standard Heating temperature range
(min – max °C)
75% maximum CH time
Heating OFF hysterisis (°C)
Heating ON hysterisis (°C)
Anti-cycle delay
Pump over-run
Low output (min. output + %)
CO function max temp. (°C)
CO re-light temp. (°C)
CO function time
Flow NTC max temp. (°C)
High limit thermostat (°C)
Flue NTC max temp. (°C)
Maximum differential (°C)
IGNITION CONTROL
Ignition attempts before L/O (lockout)
Re-ignition attempts after loss of flame
signal
APPLIANCE STATUS AND FAULT CODES
When the boiler detects a temporary fault condition, the appro-
priate code is shown. If/when the fault is final a fault code will
be displayed. See ""8.14 Lights and faults"".
8.10 ADJUSTMENTS
The boiler has already been adjusted by the manufacturer, if,
however, adjustments have to be made again, for example
after extraordinary maintenance, after the gas valve has been
replaced or after a gas conversion from natural gas to LPG, or
vice versa, follow the procedures described in following.
The maximum and minimum power settings, maximum he-
ating and slow ignition must be performed strictly in the se-
quence indicated and only by qualified personnel:
ƒ power the boiler
ƒ carry out the access procedure to the parameters as indica-
ted in paragraph ""5.1 Access to the parameters""
ƒ select menu P3 and confirm the selection with
ƒ display the desired parameter using the arrows - see table -
P3.06
min fan speed
P3.07
max fan speed
P3.08
soft ignition
P3.09
max CH fan speed
ƒ then enter the sub-menu by pressing
ƒ set the desired values with
following tables
table 1
MAX CH RPM FAN
NATURAL GAS
SPEED
(G20)
20 S
6.200
25 S
5.800
30 S
6.900
VALUE
230Vac
230Vac
230Vac
230Vac
24Vdc
10Kohm
10Kohm
VALUE
40 - 80
15 min
SP + 5
SP – 5
3-min
30-sec
Min+25
90
78
15-min
90
105
125
35
VALUE
5
5
and
, referring to the
LPG
(G31)
6.000
rpm
5.700
rpm
6.800
rpm
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