Viessmann Vitotronic SPS Service Instructions Manual page 56

Diagnosis
Overall hydraulic diagram
Pos. Designation
Heat exchanger, natural cooling/cooling
uQ
Coolant temperature sensor
uW
Coolant buffer cylinder
iP
Coolant set circulation pump
iQ
Buffer temperature sensor, top
iW
Buffer temperature sensor, bottom
iE
3-way mixer, natural cooling/3-way diverter valve, cooling mode
iT
Underfloor heating circuit/cooling circuit M1
q-P
Flow temperature sensor
q-Q
Safety temperature sensor, underfloor heating system (only for external control; requires additional con-
q-W
tactor)
3-way diverter valve, heating/cooling
q-E
Heating circ pump HC1
q-R
3-way mixer
q-T
Underfloor heating circuit/cooling circuit M2
w-P
Flow temperature sensor
w-Q
Safety temperature sensor, underfloor heating system (only for external control; requires additional con-
w-W
tactor)
3-way diverter valve, heating/cooling
w-E
Heating circuit pump HC2
w-R
3-way mixer
w-T
Underfloor heating circuit/cooling circuit M3
e-P
Flow temperature sensor
e-Q
Safety temperature sensor, underfloor heating system (only for external control; requires additional con-
e-W
tactor)
3-way diverter valve, heating/cooling
e-E
Heating circuit pump HC3
e-R
3-way mixer
e-T
Heat exchanger, residual heat
r-P
Circulation pump, residual heat
r-Q
3-way diverter valve, residual heat
r-W
Motorised 2-way valve (dry cooler shut-off)
r-E
Motorised 2-way valve (geothermal probe shut-off)
r-R
Pressure switch, residual heat
r-T
Return temperature sensor, residual heat
r-Z
Flow temperature sensor, residual heat
r-U
Dry cooler
r-I
3-way mixer for raising the return temperature
r-O
Valve switching state on delivery
56
(cont.)