Viessmann VITOLIGNO 300-C Installation And Service Instructions Manual page 22

Boiler Connections
System Layout 2
Equipment required
Pos. Description
Heat source
1 Vitoligno 300-C with
Ecotronic
2
3 Outdoor temperature sensor ATS
4 Buffer tank temperature sensor PTS, top
Buffer tank temperature sensor PTS, centre
5
6 Buffer tank temperature sensor PTS, bottom
Safety equipment block with safety valve
7
Expansion vessel
8
qZ Boiler circuit pump KKP
Return mixing valve - low temperature protection package
qU
qI Low temperature protection package
DHW heating by boiler
DHW tank
qP
Tank temperature sensor STS
qQ
DHW pump for tank heating UPSB
qW
DHW recirculation pump ZP
qE
Heating water buffer tank
eP
Heating circuit I
rP
rQ Heating circuit pump HKP M1 (heating circuit I)
and...
3-way mixing valve
rW Strap on temperature sensor
rE
Mixing valve motor M1
Heating circuit II
tP
Heating circuit distributor assembly, comprising:
tQ
Heating circuit pump HKP M2 (heating circuit II)
and...
3-way mixing valve
Strap on temperature sensor
tW
Mixing valve motor M2
tE
Temperature limiter to restrict the maximum temperature of underfloor heating systems
tR
– Version with immersion sensor
– Version with contact sensor
Accessories
Vitotrol 200A (max. two Vitotrol 200A per Ecotronic)
uP
or...
Vitotrol 300A (max. one Vitotrol 300A per Ecotronic)
or...
Vitotrol 350
uQ
Low water cutoff
uW
KM BUS distributor
uU
Output feedback
iQ
External default output
iW
External default output
iE
ON/OFF switch
iR
22
(continued)
Vitoligno 300-C Installation/Service