Control Operations Guide Bosch Buderus SSB800SA | SSB1000SA | SSB1000TL Boilers
| 11
Bosch Thermotechnology Corp. | 01.2020
Data subject to change
5.1.3 Central Heating Mode 2
(Full Outdoor reset with no heat demand)
CH Mode“2”
- Boiler demand is generated when the outdoor temperature falls
below the value of
Warm Weather Shut Down
(par.#25). When this occurs the
Boiler and CH pump contacts are energized and the Boiler will target a system
supply water temperature corresponding to a point on the installer programmed
heating curve.
Night Setback Temp
(par.# 28) controls the parallel temperature
shift that is applied to the curve when #9 and #10 contacts are “open” using a clock
or switch.
Central Heating
(CH) Mode
Description
Set these Parameters
Parameter #
Description
Default
Range
CH Mode = “2”
Full Outdoor reset
with no heat demand
1
CH Mode
0
0 - 5
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%
19
Design Supply Temp
194°F
86- 194°F
20
Design Outdoor Temp
23°F
-13 - 77°F
21
Baseline Supply Temp
104°F
68 - 194°F
22
Baseline Outdoor Temp
68°F
32- 86°F
23
Design Supply Min Limit
86°F
39.2 – 179.6°F
24
Design Supply Max Limit
194°F
80.6 - 194°F
25
Warm Weather Shut Dn
71.6°F
32- 95°F
26
Boost Temp Increment
0°F
0 - 54°F
27
Boost Temp Delay
20 min.
0 – 120 min.
Table 6
