Bosch Buderus SSB512 - Page 13

Control Operations Guide Bosch Buderus SSB255 | SSB399 | SSB512 Boilers | 13
Bosch Thermotechnology Corp. | 03.2018
Data subject to change
Figure 3
Pump mode = 2 (default) Boiler with a manifold and two pump circuits CH/DHW
DHW_mode=1DHW_mode=0 (Ch only)
CH
return
CH supply
Primary
Heat Exchanger
T_flue
CH PUMP
Manifold
T_supply
Safety Limit
GENERAL
PUMP
N
LJ6-1
J6-3
J7-5
J6-2
DHW
PUMP
CH /SYSTEM
PUMP
L
N
L
J7-2
GENERAL
PUMP
J7-1
PE
CH return
CH supply
GENERAL
PUMP
Manifold
in
DHW
CH
PUMP
T_store
DHW
PUMP
out
Primary
Heat Exchanger
Figure 4
Pump mode = 0 Boiler with two pump circuits Ch/DHW (move the internal pump wiring to the CH terminal)
DHW
PUMP
T_store
CH supply
out in
DHW
CH return
CH
PUMP
Primary
Heat Exchanger
DHW_mode=1
DHW
PUMP
DHW_stat
CH supply
out in
DHW
CH return
CH
PUMP
Primary
Heat Exchanger
DHW_mode=2
CH supply
CH return
CH
PUMP
T_return
T_flue
T_supply
Safety Limit
Primary
Heat Exchanger
DHW_mode=0 (Ch only)
CHW
PUMP
L
J6-1
J6-3
J6-2
J7-1
N
L
PE
Figure 5
Pump mode = 1 Boiler with one primary pump and 3-way valve for DHW (move the internal pump wiring to the CH terminal)
3-WAY
VALVE
T_store
CH supply
out in
DHW
CH return
GENERAL
PUMP
Primary
Heat Exchanger
DHW_mode=1
3-WAY
VALVE
DHW_stat
CH supply
out in
DHW
CH return
BOILER
PUMP
Primary
Heat Exchanger
DHW_mode=2
CH supply
CH return
GENERAL
PUMP
T_return
T_flue
T_supply
Safety Limit
Primary
Heat Exchanger
DHW_mode=0 (Ch only)