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We reserve the right to make any changes due to technical modifications.
Commissioning and maintenance instructions Logano GE434 Gas-fired special boiler • Issue 02/2003
Buderus Heiztechnik GmbH • http://www.heiztechnik.buderus.de
Boiler operating conditions for countries outside the EU
12
12.9 Operating conditions
Always maintain the operating conditions to safeguard
the perfect boiler function. It may be necessary to install
a second annular butterfly valve with actuator motor
(Fig. 31,
) (accessory) in place of the adaptor
) in the l.h. boiler block. This is the case,
–
if no external components are used to reduce the
volume flow (e.g. control of the heating circuit
actuators or external butterfly valve through the
control unit), and
–
if the functionality of the control unit used cannot
maintain the Buderus Ecostream conditions
(Buderus control units for modulating low
temperature operation, applicable for medium and
large boilers are equipped with this control logic).
In such cases, please contact your nearest Buderus
sales office.
Fig. 31
Adaptor
Item 1:
Annular butterfly valve with actuator motor
Item 2:
Adaptor
1
2
Boiler
Operating conditions
Boiler water volume
flow
Operating flow
temperature at burner
"ON"
Operating interruption
(complete boiler
shutdown)
Min. return temperature
in conjunction with a Logamatic control device for modulating low-temperature operation
Logano
GE434
No requirements
No requirements
Operating temperatures are
safeguarded by the
Logamatic control device
1
No requirements
No requirements
in conjunction with a Logamatic control device for constant boiler water temperatures, expanded by external control
Logano
GE434
No requirements
60 °C
2
No requirements
No requirements
Tab. 31 Operating conditions
1
If heating circuits (pumps, actuators) or a boiler circuit actuator (control of the operating flow temperature) cannot be regulated via the control
device, an operating temperature of 50 °C must be reached within 10 minutes of switching the burner ON by means of restricting the volume flow.
2
Boiler control thermostat setting: When the burner is ON, the minimum boiler water temperature inside the boiler must be reached and maintained
as minimum temperature within 10 minutes by suitable means, e.g. a reduction in volume flow.