Connection Of External Electrical Components - Viessmann VITOCAL 300-A Installation And Service Instructions Manual

Positioning of all electrical connections
Connection to the Vitodens and
Vitopend
A Heat pump connection: Contact
load 230 V, 4(2) A, zero volt con-
tact
B Transfer jumper from 1X3.1 to
2X7.1
C Connection at the external heat
source on the terminals for exter-
nal demand
D High limit safety cut-out (STB, set
to 70 °C) as heat pump protection
K1 Sizing in accordance with the
external heat source; observe
safety instructions

Connection of external electrical components

Secondary pump group (type AW-O)
The heat pump type AW-O does not have a pump or a 3-way valve on the sec-
ondary side.
Installation sequence
(cont.)
Note
The heat pump sensor F20 must
record the temperature of the external
heat source medium.
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