General Operating Requirements - Buderus Logano G125 BE US/CA Installation And Service Instructions Manual

3.2.1 General Operating Requirements

Minimum Boiler tempera-
ture
No requirements
Operating conditions are met
2
with R2107 control
3
150 °F
Table 3 General Operating Requirements
1
A heating circuit equipped with a motorized mixing valve improves the controllability of that sub-system and is specifically recommended when
requiring different water temperatures.
2
In case the control system has no influence over the flow in a heating circuit (for instance using the Pumplogic feature of the R2107), then one
should achieve a minimum supply temperature of 122 °F within 10 minutes after burner start-up by means of reducing (or interrupting) the water
flow through the boiler.
3
Minimum setting on the adjustable high limit or Aquasmart: During burner operation one should achieve the minimum boiler temperature within
10 minutes after burner start-up by means of flow reduction and one should maintain this temperature.
Logano G125 BE - Specifications subject to change without notice.
Operating Conditions
Boiler Shutdown
Systems controlled by R2107 controls for outdoor reset operation
Automatic with Logamatic
R2107
Systems controlled by Aquasmart or R2109
Possible, provided the boiler op-
erates after total shut-down for
at least 3 hours.
Boiler Shutdown/
1
Mixed temperature
No requirement, yet beneficial
with low temperature boiler with
130/113 °F system design
Necessary with:
– Radiant floor applications
– Systems with large water con-
tent > 115 gal/100,000 Btu/hr
Necessary
Technical Information
Minimum return temperature
No requirement
Necessary for:
– Systems with large water
content > 115 gal/100,000
Btu/hr: 130 °F
– Firing with modulating burn-
ers: 130 °F
3
9