Viessmann VITOCAL 300-G PRO Installation And Service Instructions Manual page 101

Repairs
(cont.)
qR Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
Hot gas temperature sensor EEV 2/
Compressor 2 (Stage 2)
qT Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
Compressor 2 (Stage 2)
qZ Hot gas temperature sensor EEV 1/
Compressor 1 (Stage 1)
qU Compressor 1 (Stage 1)
qI Oil level sight glass compressor 1
and 2
qO Secondary circuit return tempera-
ture sensor
Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
2 return temperature sensors, sec-
ondary circuit
wP Filter dryer
wQ Only type BW 302.A090,
BW 302.A120, BW 302.A150,
BW 302.A180, BW 302.A250:
Second parallel filter dryer
wW Condenser
wE Evaporator
wR Primary circuit return temperature
sensor (heat pump brine outlet)
wT Secondary circuit flow temperature
sensor
wZ Primary circuit flow temperature
sensor (heat pump brine inlet)
Troubleshooting
101