Supplied By www.heating spares.co Tel. 0161 620 6677
25
7.8.2
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 (fig.16).
Repeat above test on the Live & Ear th
connections at the appliance terminal strip (fig.16).
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.
7.8.3
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
(fig.16). The meter should read approximately
230V ac. If so proceed to next stage. If not, see
7.8.4.
●
●
●
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●
Connect test leads between the Live & Earth
connections at the appliance terminal strip
(fig.16). The meter should read approximately
230V ac. If so proceed to next stage. If not, see
7.8.4.
●
●
●
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Connect test leads between the Neutral & Earth
connections at the appliance terminal strip
(fig.16). The meter should read approximately 0
– 15Vac. If so polarity is correct. If not, see 7.8.4.
7.8.4
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.
7.8.5
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 (fig. 16). 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.
7.9
FAULT FINDING
Before attempting any faultfinding, the electrical
checks as detailed in 7.8 must be carried out.
Isolate the appliance from the electrical supply.
Disconnect any external controls from terminal
plug M5 (fig. 16), and insert a link-wire between
the two wires at the ‘TA’ connections (fig. 16).
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 7.2.
Should the boiler fail to respond, the internal fuses
and connectors should be checked to ensure
integrity and continuity. If the boiler still fails to
respond, refer to the detailed faultfinding flowcharts
located at the end of this section.
COMPONENT
VALUE
Fan
230Vac
Pump
230Vac
Valve actuator (Combi only)
230Vac
Ignition transformer
230Vac
Gas valve
230Vac
Room thermostat connection
230Vac
NTC thermistor (dry contact)
10Kohm
NTC thermistor (wet contact)
10Kohm
FUNCTION
VALUE
Standard Heating Range (°C)
40 – 80
Floor Heating Range (°C)
20 – 45
CH limited power at 75%
15 Min
Heating OFF hysterisis (
0
C)
SP + 5
Heating ON hysterisis (
0
C)
SP – 5
Anti-cycle delay
3-min
Pump over-run
30-sec
Low output (min. %)
Min+25
CO function max temp. (
0
C)
95
CO re-light temp. (
0
C)
75
CO function time
15-min
Flow NTC max temp. (
0
C)
95
High limit thermostat (
0
C)
105
Burner thermostat (
0
C)
170
Maximum differential (
0
C)
35
IGNITION CONTROL
VALUE
Ignition attempts before L/O (lockout).
5
Re-ignition attempts after loss of flame signal 5
7.10
COMPONENT VALUES & CHARACTERISTICS
7.11
BOILER CONFIGURATION
The boiler can be configured by means of the
JUMPER Tag which configuration is shown in the
below:
JP4 CONFIGURATION
●
●
●
●
●
JUMPER ON POSITION 1: FLOOR HEATING
(IF SET) / STANDARD HEATING (IF NOT USED)
●
●
●
●
●
JUMPER ON POSITION 2: (UNUSED)
●
●
●
●
●
JUMPER ON POSITION 3: (UNUSED)
●
●
●
●
●
JUMPER ON POSITION 4: (UNUSED)
●
●
●
●
●
JUMPER ON POSITION 5: (UNUSED)
●
●
●
●
●
JUMPER ON POSITION 6: CH HEATING ONLY.
FOR CONFIGURATION SEE REFERENCE
NUMBER (PIN1 ON PCB) AS SHOWN IN
BELOW.
JP4
