Viessmann Vitocal 252-A Series - Page 173

173
wQ
Non-return valve
wW
Liquid gas temperature sensor, heating
wE
Condenser
wR
Accumulator (refrigerant receiver)
wT
High pressure switch PSH
wZ
High pressure sensor
wU
Low pressure sensor
wI
Schrader valve, high pressure side 2
wO
Internal heat exchanger
Outdoor unit with 2 fans, types ...A16 to A19
4
5
6
7
qP
8
9
1
2
3
wW
qU
wE
qO
qI
qQ
wQ
wP
qW
qE
qR
qT
qZ
wRwTwUwZwIwOeP
Fig. 117
1
Fan
2
Evaporator
3
Air intake temperature sensor
4
4-way diverter valve
5
Secondary circuit flow temperature sensor
6
Electronic expansion valve 1
7
Liquid gas temperature sensor, cooling
8
Electronic expansion valve 2
9
Schrader valve, high pressure side 2
qP
Liquid gas temperature sensor, heating
qQ
Safety valve 3 bar
qW
Hot gas temperature sensor
Outdoor unit maintenance
Overview of internal components (cont.)
6222080
Maintenance