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Figure 22
15.2 Setting the Maximum Central Heating Flow Temperature: The boiler is dispatched with
the CH fl ow temperature set at 85°C. When a lower maximum temperature is required, such
as in the case of under-fl oor heating, the factory setting can be adjusted to a maximum of
50°C giving a return temperature of 30ºC, by setting dip switch 'S6' into ON position.
15.3 255 seconds delay setting: The boiler is capable of up to 255 seconds ignition delay
(anti cycling time) before re-ignition following burner shut down on the primary hydraulic
water reaching its set temperature. This delay can be increased up to a maximum of 255
seconds by turning potentiometer R28 (Figure 22) clockwise.
15.4 Pump working mode setting: The boiler has a factory set to operate the pump for
pre-purge and post-purge times (45 sec.). This delay can be excluded by fi tting dipswitch 'S2'
(fi gure 23) into ON position. However, this may then cause the boiler over-heat thermostat
to trip out.
Figure 23
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