System Example For The Logamax Plus Gb162-50/65 And Gb162-50/65/80/100 In A 2-Boiler Cascade With Two Heating Circuits With Mixer - Buderus Logamax plus GB162 Technical Manual

6 System examples
6.4.9 System example for the Logamax plus GB162-50/65 and GB162-50/65/80/100 in a 2-boiler cascade
with two heating circuits with mixer
PZ
KR
VS
FW
EK
Fig. 82 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 module enable the
control of up to four gas condensing boilers in a
cascade.
• Cascade system with DHW heating via pump
connection assembly with 3-way valve kit via boiler
no. 1.
• Pump connection assembly incl. 3-way valve kit only
suitable for the Logamax plus GB162-65.
Consequently, only a GB162-65 boiler can be used for
DHW heating.
• System particularly suitable for a high heat demand but
a low DHW demand.
84
FA
Logamax plus
GB162-65
FS
BC10
G-SU
2)
SV
VK RK
RS
fig. 46, page 53) – Allow for a
BUS
BUS
FS
2)
SV
MAG MAG
VK RK
WH
Special design information
• Optional control of two heating circuits without mixer.
• The DHW temperature sensor FW is connected at the
terminal strip of boiler no. 1.
• Taco setters for every boiler are not required if the
pump assembly is used.
• The boiler output is called for in series. The second
boiler starts if the output of the first boiler is insufficient
to achieve the set value.
6 720 645 821 (2010/09) – Logamax plus GB162
2x0,6 2
Logamatic 4121
mit FM456
2x0,6 2
4x1,5 2
3x1,5 2
2x0,6 2
THV
TWH
TWH
FV2 FV2
KR
3)
PH2
PH1
SH1 SH2
(HSM..)
VH RH
FK
MAG
SMF
page 52)
1)
HK1
1)
ZV (THV)
HK2
KR
3)
(HSM...)
(HKV 2/...)
6 720 642 463-65.1il