Technical information
6 720 645 504 (2011/04) en
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8.3 Functional description of system solutions
System without additional heat ( Chapter 8.2.2)
Heating
Heat for E11 is taken directly from buffer tank E11.C111.
Heat for E12 is taken from buffer tank E11.C111 and is
shunting 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 when the temperature is too low
and stopping one compressor at a time when the
temperature is too high.
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.
System with mixed additional heat
( Chapter 8.2.3)
Additional heat and heat pump work in parallel
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 released by shunting at the set temperature
using mixing valve E12.Q11. The heat pump supplies
heat to E11.C111 in order to keep the temperature set
on E11.T11 by starting one compressor at a time 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 E71.E1.Q71 is
activated and regulates E11.T1 to the set temperature.
Additional heat and heat pump work separately
When the heat pump is responsible for all of the heating,
it supplies heat to E11.C111 and keeps the temperature
set on E11.T11 by starting one compressor at a time
when the temperature is too low and stopping one
compressor at a time when the temperature is too high.
When the heat pump is in operation, boiler E71 is
responsible for all of the heat production. Heat for E11
is taken from buffer tank E11.C111 or from E71. Heat for
E12 is taken from buffer tank E11.C11 or from E71 and
is shunted to the set temperature using mixing valve
E12.Q11. Switch between heat pump and additional
heat operation can result from low outdoor temperature,
temporary stop of the energy supply to the heat pump or
activation of external input for blocking the heat pump.
Hot water
The hot water is preheated in E41 which is heated by the
heat pump. 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. The hot water is afterheated
in E42 which is heated by additional heat E71. The
heating of the hot water circulation via E41.G6 is done
completely by E42. Additional heat E71 exercises full
control and regulation of the temperature in hot water
heater E42.
Pump control
E11.G1 and E12.G1 start at a low outdoor temperature
and stop at a 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 are in operation
at the set times. E41.E1.G1 ( Chapter 11.9) is
controlled by the heat pump and is used for thermal
disinfection of E41.
High temperature systems
In some heating systems the return temperature may at
times exceed 55 °C. In such cases the heat pump stops
(T9 > 55 °C) and restarts when E11.T1 becomes less
than 65 °C.
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