Control Operations Guide Bosch Buderus SSB800SA | SSB1000SA | SSB1000TL Boilers
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Bosch Thermotechnology Corp. | 01.2020
Data subject to change
5 Heating Modes
5.1 Central Heating (CH) Mode
There are 5 onboard CH Mode settings which may be selected with the SSB Boiler.
1.
CH Mode = “0”
Setpoint control of the boiler using dry contacts (TT)
2.
CH Mode = “1”
Outdoor Reset using ON/OFF control of the boiler using dry
contacts (TT)
3.
CH Mode = “2”
Outdoor reset with night setback
4.
CH Mode = “3”
Setpoint with night setback
5.
CH Mode = “4”
Analog control (0-10Vdc) of set point temperature
5.1.1 Central Heating Mode 0
(Setpoint control of the boiler using dry contacts #9 and #10)
CH Mode “0”
- Boiler demand is generated thru a call for heat on low voltage
contacts #9 and #10 (dry contacts only). The Boiler will then target a temperature
equal to
CH Setpoint
(par.#3) at the Supply Temperature Sensor.
Central Heating
(CH) Mode
Description
Set these Parameters
Parameter #
Description
Default
Range
CH Mode = “0”
Setpoint control using dry
contacts (TT)
1
CH Mode
0
0-5
3
CH Setpoint
140°F
86 - 194°F
109
Calc. Set point Offset
0 °F
-1.8 - 1.8 °F
5
Boiler pump overrun
30 sec.
0 – 900 sec.
7
CH Hysteresis up
36°F
0 - 36°F
112
CH Hysteresis down
9 °F
0 - 36°F
9
Anti-cycle period
180 sec.
10 – 900 sec.
10
Anti-cycle Temp Diff
28.8°F
0 - 36°F
14
Max Power CH
100%
50-100%
15
Min Power CH
1%
1-30%
23
Design Supply Min Limit
86°F
39.2 - 179.6 °F
24
Design Supply Max Limit
194 °F
80.6 - 194 °F
Table 4