Viessmann VITOCAL 300 Installation And Service Instructions Manual page 29

Additions to the system versions
Connection diagram
| Open
Required devices
Pos. Description
qI
Contact humidistat
wR
Vitotrans plate-type heat exchanger
wT
Frost stat
wZ
Circulation pump (primary cooling circuit pump)
wU
Mixer-3 (primary cooling circuit)
wI
Two-way motorised ball valve
eQ
Circulation pump (secondary cooling circuit pump)
eW
Diaphragm expansion vessel
rR Flow temperature sensor for mixer wU
rT
Room temperature sensor natural cooling circuit
*1
Option, see table on page 9.
Preparing for installation
(cont.)
~ CLOSE
A Power supply from the control
panel (230 V)
* 1
Qty.
1
1
1
1
1
1
1
1
1
1
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