Assembly - Buderus Logamax plus GB162 Technical Manual

6 System examples
6.4.7 System example for the Logamax plus GB162-50/65/80/100 in a 2-boiler cascade, one heating
circuit with mixer and one without, DHW heating via cylinder primary pump and use of a pump

assembly

FA
FS
2)
SV
MAG
VK RK
Fig. 80 Circuit diagram for the system example (index of abbreviations
1)
Hydraulic balancing at the thermostatic valves/zone valves
recommended
2)
Pump and safety valve are integrated into the pump
connection assembly (
safety valve on site if the pump assembly is not used
3)
Differential pressure-dependent pump
The circuit diagram is only a schematic
illustration.
Information regarding all system examples
page 52 ff.
Brief description
• The Logamatic 4121 and FM456 (KSE2) module
enable the control of up to three gas condensing
boilers in a cascade.
• DHW heating can be given priority or can operate in
parallel with its individual time channel.
82
FS
PZ
KR
2)
SV
MAG
RK
VK
fig. 46, page 53) – Allow for a
2x0,6 2
BUS
BUS
2x0,6 2
3x1,5 2
2x0,6 2
KR
FW
PS
EK
(HS..)
FK
MAG
SMF
WH
page 52)
Special design information
• The appliances used must have their own integral
pump.
• If the appliances are equipped with modulating pumps,
operate them in output-dependent mode.
• The components required to protect the boiler, e.g.
safety valve and check valve, are already part of the
pump assembly.
• Using the FM457 module instead of the FM456
module enables the control of up to five gas
condensing boilers in a cascade. The boilers are
controlled in sequence.
• Size the flow and return pipe to/from the low loss
header for the maximum cascade output. Determine
the size of the low loss header in accordance with the
permissible flow rate (
6 720 645 821 (2010/09) – Logamax plus GB162
Logamatic 4121
mit FM456
4x1,5 2
3x1,5 2
2x0,6 2
1)
THV
HK1
ZV (THV)
TWH
HK2
FV2
KR KR
3)
PH2
3)
PH1
SH2
(HSM...)
(HKV 3/...)
VH RH
6 720 642 463-64.1il
chapter 8).
1)