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

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