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Schedule
Boost
The boost feature is available when an indoor sensor is not
installed, and a programmable schedule is in use .
When a programmable schedule is used to lower the
building temperature at night, there is a time delay to increase
the building temperature from the Unoccupied to Occupied
temperature . The control shortens the recovery time by
determining how long the steam boiler needs to operate at
100% on time of a heating cycle and the boost can continue
through multiple heating cycles . The length of the boost is
determined by the temperature difference between Occupied
and Unoccupied and the duration of the unoccupied time
period . The Boost setting allows the installer to set the maxi-
mum amount of time that Boost can remain in effect . Boost is
shown on the system inputs screen while boost is in effect .
Building
Temperature
Occupied
% On Time
Per Cycle
Early Start
The Early Start feature is available when an indoor sensor is
installed, and a programmable schedule is in use .
When a programmable schedule is used to lower the build-
ing temperature at night, there is a time delay to increase the
building temperature from the Unoccupied to the Occupied
temperature . When early start is on, the control uses the
indoor sensor to learn the heat up rate of the building . The
control can then accurately predict when the control should
increase the heating cycle on time so that the building reaches
the Occupied temperature at the scheduled time . Optimum
Start is shown in the system inputs screen while early start is
in effect .
Optimum Start
10 P.M.
Setback
Room
Temp.
Optimum
Start
30
Unoccupied
Occupied
Setback Period
Boost
5A.M. 8A.M.
Period
Occ
70°F (21°C)
UnOcc
65°F (18°C)
Recovery Period
Smart Setback
When the heating cycle reaches 85% on time, the Smart
Setback feature prevents the programmable schedule
Unoccupied period from going into effect to avoid long recovery
times . If the control is already using unoccupied setpoints
and the outdoor temperature drops so that the heating cycle
on time exceeds 85%, the control will switch to using the
occupied setpoints .
When Smart Setback is off, the control continues to operate
on the occupied/unoccupied programmable schedule, regardless
of the heating cycle on time .
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