Viessmann VITOCAL 300 Installation And Service Instructions Manual page 27

System version 3
B Power supply of the external heat
source (on-site)
Required devices
Pos. Description
1
Vitocal 300 heat pump
2
Three-way diverter valve, heating/DHW
4
Diaphragm expansion vessel
qW
Outside temperature sensor
qE
Room temperature sensor of the direct heating circuit
qR
Room temperature sensor of the heating circuit with mixer 1
qT
Overflow valve
qZ
Direct heating circuit (radiator heating circuit)
qU
Heating circuit with mixer (underfloor heating circuit)
qO
Temperature limiter (only required for the underfloor heat-
ing circuit)
wQ
Heating circuit pump, direct heating circuit
wW
Heating circuit pump, mixer circuit
wE
Mixer-3 (heating circuit with mixer)
wO Flow temperature sensor for mixer wE
rO
Zero volt contact for central fault messaging (acoustic or
optical alarm equipment, on site)
"Low loss header" option
5
Low loss header
8
Buffer cylinder temperature sensor (top)
Option "External heat source"
3
High limit safety cut-out 70 °C for switching the external
heat source
9
Temperature sensor mixer "external heat source"
qP
Mixer "external heat source"
qQ
Boiler water temperature sensor of the external heat
source
tP
Contactor relay for switching the external heat source
Natural cooling option
qI
Contact humidistat
wP
Three-way diverter valve heating/cooling
wR
Vitotrans plate-type heat exchanger
wT
Frost stat
(cont.)
C Power supply from the control
D Temperature limiter for underfloor
Preparing for installation
panel (230 V)
heating system qO with heating
circuit pump wW; switch in series
Qty.
1
1
1
1
1
1
as required
1
1
1
1
1
1
1
2
1
1
1
on-site
1
1
1
1
27