Assembly - Buderus Logamax plus GB162 Technical Manual

6.4.8 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
RK
VK
Fig. 81 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 4323 and the FM441 and FM458
modules 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.
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.
6 720 645 821 (2010/09) – Logamax plus GB162
FS
PZ
KR
2)
SV
MAG
VK RK
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
WH
page 52)
• 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 (
• Control unit Logamatic 4323 and the FM441 and
FM458 modules offer the following control options:
– One heating circuit with mixer via the standard
control unit Logamatic 4323
– With one FM458 module, cascades of up to four
boilers can be controlled (max. eight boilers with two
modules)
– With one FM441 module, DHW heating and one
heating circuit with mixer or one heating circuit
without mixer are feasible
• The following controls for the gas condensing boilers
are possible:
– Parallel or serial boiler operation
– Load restriction according to outside temperature,
e.g. boiler 2 is blocked from an outside temperature
of 10 °C
– Optional combination of EMS wall mounted boilers
with EMS floorstanding boilers
– Cascades even with boilers of different output sizes
(e.g. output split 60 %:40 %)
System examples
Logamatic 4323
mit FM441, FM458
4x1,5 2
3x1,5 2
2x0,6 2
1)
THV
HK1
TWH
FV2
KR
KR
3)
PH2
3)
PH1
SH2
(HSM...)
(HKV 3/...)
VH RH
SMF
6 720 642 463-74.1il
chapter 8).
6
1)
ZV (THV)
HK2
83