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Application examples
8.1 Pyromat Eco with two heating circuits with mixer, heating water buffer cylinder and
DHW heating with DHW cylinder
ID: 4605384_1304_04
Applications
Heating system with log boiler, with one or several heating circuits with
3-way mixer, heating water buffer cylinder plus DHW heating.
Main components
■ Pyromat Eco
■ Ecotronic boiler control unit
■ Return temperature raising facility
■ Heating water buffer cylinder
■ DHW cylinder
■ Buffer cylinder control valve
Function description
In order to achieve the required set temperatures in heating circuits
tP/zP or for DHW heating uP, the Pyromat Eco 1 runs through the
following operating phases:
■ Heat up
■ Load operation
■ Residual heat utilisation
■ Drawing [heat] from the buffer cylinder
These are shown on the control unit display.
Heat up
Boiler 1 starts after charging and lighting the fuel. Initially, the air
dampers are zeroed.
Load operation
If the flue gas temperature exceeds 120 °C or the residual oxygen
content is less than 15 % (for 2 minutes), the air dampers enter their
controlled mode. For this, the air dampers are constantly regulated to
the respective set value via the value of the actual residual oxygen
content.
The actual flue gas temperature will be prevented from exceeding its
max. value by the flue gas fan and the adjustment of the primary air
dampers.
Residual heat utilisation
The residual heat utilisation phase begins if the flue gas temperature
falls below 100 °C. Buffer cylinder control valve rT remains closed and
boiler control valve 4 remains fully open for as long as the boiler flow
temperature is higher than the set system temperature.
ID: 4605384_1304_04
Service address Ecotronic
Group
"Hardware"
"Hardware"
Additional settings on the extension kits
"Extension kit 1"
"Extension kit 2"
"Extension kit 3"
PYROMAT ECO
(cont.)
Code
Function
"Number of HC : 2"
2 heating circuits installed
"Number of DHW : 1"
1 DHW group installed (DHW cylinder with circulation pump)
"Rotary selector S1 : 1"
Heating circuit 1
"Rotary selector S1 : 3"
Heating circuit 2
"Rotary selector S1 : 5"
Heating circuit for DHW heating
Drawing [heat] from the buffer cylinder
If the boiler flow temperature falls below the set system temperature,
the heat for heating circuits tP/zP or for DHW heating uP is drawn
from heating water buffer cylinders rP/rQ. For this purpose, boiler
control valve 4 is completely closed and buffer cylinder control valve
rT fully opened.
Return temperature raising facility
The Pyromat Eco 1 requires a minimum return temperature. When
boiler circuit pump 3 starts, boiler control valve 4 opens the path
from the central heating return to the Pyromat Eco 1 in line with the
increasing return temperature and closes the path from the boiler flow
to the boiler return (bypass).
As soon as boiler control valve 4 is fully open, buffer cylinder control
valve rT takes over return temperature raising.
Charging the heating water buffer cylinder
During the combustion phase, heating circuits tP/zP/uP are supplied
with heat first of all by boiler circuit pump 3. As soon as the consum-
ers enter controlled mode, the boiler heat not required for heating pur-
poses is routed via buffer cylinder control valve rT into the heating
water buffer cylinder, maintaining a precise temperature stratification.
Following burnout, the residual boiler heat is utilised by the buffer
charging management, before the consumers are supplied by heating
water buffer cylinders rP/rQ.
Heating by the Pyromat Eco
The boiler heat is routed to the heating distributor by boiler circuit pump
3 if the boiler water temperature of the Pyromat Eco 1 exceeds
65 ºC. At this point, 3-way mixers tR/zR regulate the flow temperature
in accordance with the specified heating curve in weather-compensa-
ted mode.
Heating by the heating water buffer cylinder (heat drawn from the
buffer)
If the boiler flow temperature falls below the set system temperature,
the heat for heating circuits tP/zP or for DHW heating uP is drawn
from heating water buffer cylinders rP/rQ. For this purpose, boiler
control valve 4 is completely closed and buffer cylinder control valve
rT fully opened. The heat required to supply the heating circuits is
drawn from the heating water buffer cylinders using heating circuit
pumps tE/zE. The flow temperatures are also regulated in weather-
compensated mode via 3-way mixers tR/zR.
DHW heating
When the temperature at cylinder temperature sensor uW falls below
the set value, circulation pump for cylinder heating uE starts and DHW
cylinder qP will be heated. Circulation pump for cylinder heating uE
continues running until the DHW temperature at cylinder temperature
sensor uW has reached its set value. To optimise cylinder heating,
regulating valve uR takes the flow rate higher or lower, depending on
the temperature spread between cylinder temperature sensor uW and
return temperature sensor uT.
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