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3. Central Heating Logic Programme
PLEASE NOTE:
With the appliance operating in central heating mode a built in logic programme will
monitor the modulation to determine the heat load of the appliance. Subsequent heating
cycles will be automatically pre-determined to avoid excessive gas use and un-necessary
cycling of the heating system.
1. The initial 30 SECONDS of output will remain at minimum burner pressure. After this
period of stabilisation “modulation” will then take place if required.
2. During modulation, if the temperature selected at the control panel is achieved within 5
MINUTES, the boiler will shut down and the next cycle will be pre-determined at
minimum burner pressure. (see fig. 1)
3. When the water in the CH circuit cools below that set on the control panel the boiler will
fire up on minimum burner pressure for 5 MINUTES. This is due to a low heating load
being detected. If the temperature selected at the control panel is not achieved
WITHIN 5 minutes, the normal modulation will resume in order to achieve the desired
temperature. (see fig. 2)
IMPORTANT NOTE: It is not possible for the user to over ride the logic program during
either the initial 30 seconds of the heating sequence or during the subsequent 5 minutes
running on minimum burner pressure.
Adjusting the temperature upwards at the control panel will not increase the burner
pressure. This may give the impression the modulation may be faulty. DO NOT attempt
to reset gas pressures etc. during this period. To initiate a 'clean start' to override the five
minute minimum burn period 'reboot' the central heating by switching the mains power off
for five seconds. When power is restored the appliance will then restart with the 30
seconds of minimum output followed by modulation (if necessary) following the same
timing sequence as before. Interruption by room thermostat does not activate the period
of 5 minutes minimum output. Initial lighting up pressure at re start will always be 30
seconds at minimum output.
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