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If the temperature falls below the enable temperature of the heating
circuits, the oil-fired boiler is started. The preset target temperature
for the oil-fired boiler is calculated from the outside temperature,
characteristic heating curve, room temperature, parallel shift and oil-
fired boiler overtemperature. When the oil-fired boiler reaches either
its preset temperature or the Max oil burner temp it switches
off, restarting when it has cooled down by the amount of the oil-fired
boiler hysteresis.
If two different enable temperatures have been specified for hot
water and for heating circuits, and if there is no demand on the hot
water tank, the oil-fired boiler will only start once the temperature
has fallen below the enable temperature for the heating circuits.
If there is no demand on the heating circuits or the hot water tank
and if the accumulator temperature is under the enable temperature,
the oil-fired boiler must maintain the Min oil burner temp (e.g.
for summer operation).
If the oil-burner is in operation, the enable temperatures of the
“loads” (heating circuits, hot water tank) are compared with the tem-
perature of the oil-fired boiler and are used as reference values.
✎ See the information booklet “Hydraulic solutions of the HDG Hyd-
ronic”, section “Hydraulic systems 4 and 4.S”.
P
EAK-LOAD BOILER ✎ See chapter “6 Using the heating system”, section “6.10 Structure
of the menus”, paragraph “9 - Accumulator”, parameters 9-12 to
9-15.
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