Operating instructions

Central Heating Mode
To be able to supply heating, the selector switch (34 fig. 6)
must be in ‘1111 $
(heating and hot water position) or ‘fill
(heating only position).This will be confirmed by the green
indicator light 0 (38 fig. 6).
When there is a demand for heating (either from a room
thermostat, the built-in clock or an external programmer) and
the boiler temperature control is calling for heat.
The pump starts and at a flow rate of 4 Itr/min the central
heating flow switch operates allowing the ignition sequence to
begin.
The safety solenoid (3a fig. 7) and the first stage solenoid (3b
fig. 7) open together to allow gas to the burner.
The ignition sequence begins and a continuous high speed
spark ignites the gas.
As soon as a flame is detected the orange indicator bulb 0
(39 fig. 6) will light.
After 45 seconds the second stage solenoid (3c fig. 7) opens
to allow the full gas rate.
If a flame is not detected, after 8 seconds, the security
solenoid closes and shuts off the gas.
The red lockout indicator bulb 0 (40 fig. 6) will light.
The central heating flow temperature is controlled by the
heating control thermistor (14 fig. 7).
The boiler has been designed to minimise cycling and will not
attempt to relight for at least 3 minutes after the heating
control thermistor has been satisfied (this can be set to 30
seconds if required. See Maintenance and Service Guide).
When the built-in clock, room thermostat and external
programmer are satisfied, the burner will switch off and the
pump will remain running for a further 3 minutes. (this can
also be set to 30 seconds if required. See Maintenance and
Service Guide).
NB It is possible to override
the RESET button (41 fig. 6).
the 3 minute delay
by
pressing