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

Connection and wiring diagrams
PCB 3: Sensors and KM BUS
Sensor / KM BUS
KM BUS

Safety chain (explanations)

The following diagrams showing the
safety chain contain the individual
safety elements.
The test points are identified with fig-
ures 1 and 4 to qP and refer to the
terminals marked accordingly on the
10-pole terminal block behind the
contact shield (see figure on
page 61).
For further details regarding the PCBs
and terminal markings, see from
page 63.
Symbols and abbreviation key
L' Switched phase
N' Switched neutral conduc-
tor
184
(cont.)
Type ID Connection
KM 3X1.25 / 3X2.25
BUS
Power-OFF Power supply utility block
DSW Three phase monitor
Brine Brine pressure switch
Ç Frost protection monitor
brine 1 Thermal circuit breaker
for the brine pump
SHD1 Safety high pressure
switch
ND1 Low pressure switch
RHD1 Control high pressure
switch
VSA1 Full wave soft starter
MSS1 Protective motor switch
K1 Relay, compressor con-
trol
EEV Electronic expansion
valve