Safety Chain (Part 2) - Viessmann Vitocal 300-G Installation And Service Instructions Manual

Compact heat pump with electric drive type bw/bwc, ww/wwc
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Connection and wiring diagrams

Safety chain (part 2)

186
4 - qP Terminals 4 to 10 on the 10-
pole terminal block behind
the contact shield (see
page 61)
A
Connection, safety chain
(part 1), see page 185
B
Brine pressure limiter, poss.
frost stat, frost protection AC-
Box (for commissioning,
insert jumper from the pack
supplied)
C
Protective motor switch, pri-
mary pump (if installed, jum-
per fitted at the factory)
D
Message input, primary
source 1
E
Safety high pressure switch
F
Low pressure (jumper fitted
at the factory)
G
Control high pressure
(jumper fitted at the factory)
H
Protective motor relay, com-
pressor (after the protective
motor switch has responded,
also check the thermal
breaker on the soft starter or
the separate protective motor
switch of the compressor, if
installed)
K
Message input, protective
motor switch, compressor 1
L
Compressor relay (control
unit enable)
M
Switching contact on the con-
trol unit of the electronic
expansion valve (EEV)
N
Compressor contactor

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