Technical information
6 720 645 504 (2011/04) en
21
System with electric additional heat
( Chapter 8.2.4)
Heating
Heat for E11 is taken directly from buffer tank
E11.C111, with possible afterheating by E71. Heat for
E12 is taken from buffer tank E11.C111, with possible
afterheating by E71, and is shunted to the set
temperature using mixing valve E12.Q11. The heat pump
supplies heat to E11.C111 and keeps the temperature
set on E11.T11 by starting one compressor at a time in
the heat pump when the temperature is too low and
stopping one compressor at a time when the
temperature is too high. If the heat pump does not
manage to supply the set temperature by itself,
additional heat is activated, controlling the output via 0-
10 V signal so as to keep the set temperature.
Hot water
When the temperature in hot water heater E41.T3 falls
below the set limit, E21.Q21 switches over to water
heating and compressor E21 starts. Water heating
continues until the temperature of E21.T8 exceeds the
set stop limit.
Pump control
E11.G1 and E12.G1 start at low outdoor temperature
and stop at high outdoor temperature. E21.G2 and
E21.G3 are in operation when compressor E21 is in
operation. E22.G2 and E22.G3 are in operation when
compressor E22 is in operation. E41.G6 is in operation
at set times.
This system solution is also suitable for 0-
10V output-controlled gas/oil-fired boiler.
Enter Yes for Acknowledge hot water
additional heat (Chapter 16.7) in all
system solutions.
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