Control Operations Guide
Bosch Buderus SSB255 | SSB399 | SSB512 Boilers
| 15
Bosch Thermotechnology Corp.
|
03.2018
Data subject to change
Parameter
Description
Boost Temp Increment
(parameter #26)
Boost Temp Increment is active for CH Modes 1. If a call for heat has not been satisfi ed within the period of time
defi ned within Boost Time Delay (see below) the targeted supply temperature will be increased by the value of Boost
Temp increment. This process of Boosting supply water will continue until the call for heat is satisifi ed. The default
value for this parameter is 0°F. The parameter is adjustable from 0°F to 54°F.
Boost Time Delay
(parameter #27)
Boost Time Delay is active only for CH Modes 1. If a call for heat has not been satisfi ed within the time limit (in
minutes) defi ned within Boost Time Delay, the boiler supply water temperature will be increased by Boost Temp
Increment (see above). The default value for this parameter is 20 minutes. The parameter is adjustable from 1 to
120 minutes.
Night Setback Temp.
(parameter #28)
Only available for CH Modes #2 and #3. The value the heating curve will be reset as long as contacts #11 & #12
are “closed” (i.e. via an external clock timer or switch). Default value is 18°F. The parameter is adjustable from 0 to
90°F.
Weather Setpoint
(parameter #29)
Weather Setpoint is only active for CH Modes #2 (full outdoor reset with no heat demand). When the outside
temperature falls below the value set for Weather Setpoint, a heating demand is generated and the boiler will begin
to operate. Boiler operation will continue until the outdoor temperature rises above the value set for warm weather
shutdown
Table 10
