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Logamatic 2107 Controls
Applications Manual
Logamatic 2107 Controls applications manual | 06.2018
Technical specifi cations are subject to change without prior notice
production. A standard room thermostat can be used in
conjunction with the room sensor to give high limit protection.
Setback: Buderus reset controls allow the occupant to program
setback periods in order to further reduce operating costs.
Several modes of setback can be selected with the Buderus
control. The two modes used for residential applications are
“SETBACK” and “RMSETBACK”. Unlike conventional
setback thermostats that only reduce the zone temperature
setting, the Buderus control system will operate the boiler at a
reduced water temperature. For example, at a 30°F (-1°C)
outdoor temperature the boiler water temperature may be 145°F
(63°C), at that same 30°F (1°C) outdoor temperature during a
setback period, the boiler water temperature may be reduced to
130°F (54°C).
This further reduction of water temperature will decrease the
output from the radiators by lowering the room temperature in
the living space. The extent to which the water temperature is
reduced is dependent upon the desired room temperature
reduction during setback periods. This value can be set in one
of two ways:
• SETBACK mode - a “DAYTEMP” and a “NIGHTTEMP”
would be entered on the Buderus control (this would be
done when you are not using a BFU room sensor)
• RMSETBACK mode - when using a BFU room sensor, the
room sensor allows you to select the amount of room
temperature setback.
Allowance for pick-up time must be considered when coming
out of a setback period. Systems that operate on outdoor reset
will have a longer recovery time than systems that operate at
maximum temperatures all the time. The two variables to
consider are the amount of room temperature reduction
and the length of the setback period. The use of a BFU room
sensor can speed up the recovery time, however the amount of
temperature boost is dependent upon the ROOMCOMP setting
on the Buderus control (for details refer to the control Service
Manual).
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