
Control Operations Guide Bosch Buderus SSB800SA | SSB1000SA | SSB1000TL Boilers | 5
Bosch Thermotechnology Corp. | 01.2020 Data subject to change
2 Boiler Parameters
Number Parameter Name Description Default Min Max
1 CH Mode Set Central Heating
CH Mode
based upon the desired control strategy for the boiler. 0 0 4
3 CH Set Point Central Heating Setpoint only applies to
CH Mode
#0 ( On/Off using dry contacts) and
CH Mode
#3 (Permanent set point
demand). The value set for
CH Setpoint
will be the boiler supply water temperature (system supply for cascade). 140 °F 86 °F 194 °F
109 Calc. SetP. Offset Factor used in the PID calculation to offset
CH Setpoint
up or down. 0 °F -1.8 °F 1.8 °F
110 CH Min Setpoint
CH Mode
4 setpoint at 1.5 - 2 VDC. 68 °F 68 °F 122 °F
111 CH Max Setpoint
CH Mode
4 setpoint at 9-10 VDC. 194 °F 122 °F 194 °F
5 Boiler Pump Overrun The post circulation time of the module pump at the end of the heating request. The amount of time in seconds the boiler
pump contacts will be energized after the demand for heat has ended. 30 sec. 0 sec. 900 sec.
7 CH Hysteresis Up If the supply temperature reaches a temperature above the
CH Setpoint
plus
CH Hysteresis up
, then the burner will be
switched OFF. 36 °F 0 °F 36 °F
112 CH Hysteresis Down If the supply temperature reaches a temperature below the
CH Setpoint
minus
CH Hysteresis down
, then the burner will
be switched ON. 9 °F 0 °F 36 °F
9 Anti-Cycle Period The amount of time in seconds the boiler will wait before restarting in 10 second increments. 180 sec. 10 sec. 900 sec.
10 Anti-Cycle Temp. Period Diff
In addition to the
Anti Cycle Period
(see above) the boiler will monitor the System Supply Temperature Sensor. If the
system temperature drops below the
Anti Cycle Temp. Period Diff
, the
Anti Cycle Period
will be ignored and burner will
start.
28.8 °F 0 °F 36 °F
14 Max Power CH The Maximum burner power for Central Heating can be limited during operation. 100% 50% 100%
15 Min Power CH The Minimum burner power for Central Heating operation can be limited during operation. 1% 1% 30%
19 Design Supply Temp The water temperature the boiler will supply at
Design Outdoor Temperature
. 194 °F 86 °F 194 °F
20 Design Outdoor Temp The outdoor air temperature at which the boiler will supply the
Design Supply Water Temperature
. 23 °F -13 °F 77 °F
21 Baseline Supply Temp The water temperature the boiler will supply at the
Baseline Outdoor Temperature
. 104°F 68°F 194°F
22 Baseline Outdoor Temp The outdoor air temperature at which the boiler will target the
Baseline Supply Temperature
. 68°F 32°F 86°F
23 Design Supply Min Limit The minimum supply water temperature the heating system will provide to the system. 86°F 39.2°F 179.6°F
24 Design Supply Max Limit The maximum supply water temperature the heating system will provide to the system. 194°F 80.6°F 194°F
25 Warm Weather Shut Dn The temperature above which heating is no longer necessary. All calls for heat will be ignored as long as the outdoor
temperature remains above the
Warm Weather Shutdown
value. 71.6°F 32°F 95°F
26 Boost Temp Increment
Boost Temp Increment
is active for
CH Mode
1. If a call for heat has not been satisfied within the period of time defined
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 satisified.
0°F 0°F 54°F
27 Boost Time Delay
Boost Time Delay
is active only for
CH Mode
1. If a call for heat has not been satisfied within the time limit (in minutes)
defined within
Boost Time Delay
, the supply water temperature will be increased by
Boost Temp Increment
(see above).
Supply water temperature increases again if the call for heat still is not satisfied in another time increment.
20 min. 1 min. 120 min.
28 Night Setback Temp Only available for
CH Modes
#2 and #3. The value the heating curve will be reset as long as contacts #11 & #12 are "open"
(i.e. via an external clock timer or switch). 18°F 0°F 90°F
35 DHW Mode When an Indirect tank is present in the system set
DHW Mode
to
1
when using the factory supplied 10K ohm sensor or set
to
2
if using a third-party aquastat. Default value is
0
(Off). 002
113 Max Power DHW The maximum power for DHW can be limited during operation. 50% 50% 100%
114 Min Power DHW The minimum power for DHW operation can be limited during operation. 1% 1% 30%
36 DHW Tank Hyst. Down The necessary temperature drop of the indirect tank temperature needed before the boiler will begin to recover the tank.
Only active when
DHW Mode
(par. #35) is set to
1
and a 10k ohm sensor is used. 9 °F 0 °F 36 °F
37 DHW Tank Hyst. Up The necessary temperature drop of the indirect tank temperature needed before the boiler will begin to recover the tank.
Only active when
DHW Mode
(par. #35) is set to
1
and a 10k ohm sensor is used. 9 °F 0 °F% 36 °F
38 DHW Tank Supply Extra The Target Supply Water temperature to the indirect coil is equal to
DHW Tank Setpoint
(par. #48) plus
DHW Tank Supply
Extra
. 27 °F 0 °F 54 °F
42 DHW Priority
Default setting is
Time
Time - DHW has priority to CH during
DHW Max Priority Time
*
Off - CH always has priority to DHW
On - DHW always has priority to CH
Parallel - DHW always has priority to CH. CH pump can be started if CH has a request and
CH setpoint
> supply for DHW
TIME N/A N/A
Table 1