179
Sensor / KM BUS
Type
ID
Connection
Sensor, external heat source
Pt 500
F20
3X1.4 / 3X2.4
KM BUS
—
KM
BUS
3X1.25 / 3X2.25
Safety chain (explanations)
The following diagrams showing the
safety chain contain the individual safety
elements.
The test points are identified with figures
1
and
4
to
qP
and refer to the termi-
nals marked accordingly on the 10-pole
terminal block behind the contact shield
(see figure on page 59).
For further details regarding the PCBs
and terminal markings, see from
page 61.
Symbols and abbreviation key
L'
Switched phase
N'
Switched neutral conduc-
tor
Power-OFF Power supply utility block
DSW
Three phase monitor
Brine
P
Brine pressure switch
Ç
ϑ
Frost protection monitor
ϑ
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 control
EEV
Electronic expansion valve
Connection and wiring diagrams
PCB 3: Sensors and KM BUS
(cont.)
5368 522 UAE
Service
Содержание Vitocal 300-G BW
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