Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 100

Troubleshooting
Repairs
(cont.)
wZ
3
2
wT
wP
wQ
wW
1 Wiring chamber
2 Safety high pressure switch
High pressure 1 (Stage 1)
3 Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
Safety high pressure switch
High pressure 2 (Stage 2)
4 High pressure sensor EEV 1
(Stage 1)
5 Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
High pressure sensor EEV 2
(Stage 2)
6 Suction gas temperature sensor
EEV 1 (Stage 1)
7 Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
Suction gas temperature sensor
EEV 2 (Stage 2)
100
/
89
/
67
4
5
qE
qW
qQ
qP
wE
wR
8 Low pressure sensor EEV 1
(Stage 1)
9 Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
Low pressure sensor EEV 2
(Stage 2)
qP Liquid gas temperature sensor
EEV 1 (Stage 1)
qQ Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
Liquid gas temperature sensor
EEV 2 (Stage 2)
qW Electronic expansion valve EEV 1
(Stage 1)
qE Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
Electronic expansion valve EEV 2
(Stage 2)