25
COMPONENT
VALUE
Fan
230Vac
Pump
230Vac
Ignition transformer
230Vac
Gas valve
230Vac
Room thermostat connection
24Vdc
NTC thermistor (dry contact)
10Kohm
NTC thermistor (wet contact)
10Kohm
FUNCTION
VALUE
Standard Heating temperature
range (min – max °C)
40 - 80
DHW temperature
range (min – max °C)
37 - 60
75% maximum CH time
15 min
Heating OFF hysterisis (°C)
SP + 5
Heating ON hysterisis (°C)
SP – 5
DHW OFF hysterisis (°C)
SP + 5
DHW ON hysterisis (°C)
SP + 4
Anti-cycle delay
3-min
Pump over-run
30-sec
Low output (min. %)
Min+25
CO function max temp. (°C)
90
CO re-light temp. (°C)
78
CO function time
15-min
Flow NTC max temp. (°C)
90
High limit thermostat (°C)
105
Maximum differential (°C)
35
IGNITION CONTROL
VALUE
Ignition attempts before L/O (lockout)
1
Re-ignition attempts after loss
of flame signal
1
7.9
COMPONENT VALUES &
CHARACTERISTICS
APPLIANCE STATUS LED AND FAULT CODES
When the boiler detects a temporary fault condition, the
appropriate led indication is shown. If/when the fault is final, the
pump will perform a 60-second post circulation and red LED
will be illuminated. See table on page. 4.
7.7.5 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.
7.8 FAULT FINDING
Before attempting any faultfinding, the electrical checks as
detailed in 7.7 must be carried out. Isolate the appliance from
the electrical supply.
Disconnect any external controls from terminal plug (CN5 fig.
35), 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 7. Should the boiler fail to respond, the
internal fuses and connectors should be checked to ensure
integrity and continuity.