Overview Of Internal Components, Type Bw 301.B090 To Bw 302.B250 - Viessmann KWT Vitocal 300-G Pro Installation And Service Instructions Manual

Troubleshooting
Repairs
(cont.)

Overview of internal components, type BW 301.B090 to BW 302.B250

432 6
qU qR qTqZ
Fig.43
Wiring chamber
1
Safety high pressure switch, high pressure 1 (Stage 1)
2
Only type BW 302.B090, BW 302.B120, BW 302.B150, BW 302.B180, BW 302.B250:
3
Safety high pressure switch, high pressure 2 (Stage 2)
High pressure sensor EEV
4
Suction gas temperature sensor EEV
5
Low pressure sensor EEV
6
Liquid gas temperature sensor EEV
7
Electronic expansion valve EEV
8
Only type BW 302.B090, BW 302.B120, BW 302.B150, BW 302.B180, BW 302.B250:
9
Hot gas temperature sensor / Compressor 2 (Stage 2)
Only type BW 302.B090, BW 302.B120, BW 302.B150, BW 302.B180, BW 302.B250:
qP
Compressor 2 (Stage 2)
Hot gas temperature sensor / Compressor 1 (Stage 1)
qQ
Compressor 1 (Stage 1)
qW
Sight glass, oil level, compressor 1 and 2
qE
Secondary circuit return temperature sensor
qR
Filter dryer
qT
Only type BW 302.B090, BW 302.B120, BW 302.B150, BW 302.B180, BW 302.B250:
qZ
Second parallel filter dryer
Condenser
qU
Evaporator
qI
Primary circuit return temperature sensor (heat pump brine outlet)
qO
Secondary circuit flow temperature sensor
wP
Primary circuit flow temperature sensor (heat pump brine inlet)
wQ
Secondary circuit return temperature sensor
wW
68
qP 9 qW qW qQ
1
qE
wQ
3
2
wP
qT
qZ
qU
4
6
5
7
8
qI
qO