Bosch Buderus SSB399 Control Operations Manual page 13

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