Operation Of Heating Systems With Two Heat Sources - flamco MeiTronic W10B Bedienungsanleitung

BASIC DESCRIPTIONS OF
CONTROLLER OPERATION
OPERATION OF HEATING SYSTEMS WITH TWO
HEAT SOURCES
W20 controller enables full automatic operation of heating systems with two
heat sources, for example with solid and liquid fuel boiler. Systems can operate with or
without a heat accumulator. The hydraulic connection of the two heat sources can be
parallel or successive. The successive connection uses only one heat source at the time,
while the parallel connection uses both heat sources simultaneously.
OPERATION DIAGRAM FOR HYDRAULIC SCHEMES WITH TWO HEAT SOURCES:
LEGEND:
A - liquid fuel boiler
B - solid fuel boiler or heat accumulator
PT - switchover temperature
Switchover from liquid fuel boiler (A) to solid fuel boiler or heat accumulator (B)
Heat source A is deactivated when temperature of heat source B exceeds switchover
temperature PT (point 1).
For switchover temperature PT the highest of below temperatures is taken:
- minimum temperature of heat source B, increased for 10 °C,
- the highest calculated stand pipe temperature of both mixing circuits (upper limit of
this temperature is set with parameter S5.2, reduced for 5 °C),
- measured temperature of d. h. w., increased for 10 °C (upper limit of this temperature
is set with parameter S4.8).
Diverting-valve switches to heat source B (point 2) when temperature of heat source B
is equalized with temperature of heat source A.
Service setting manual
EN
77