Viessmann VITOCAL 151-A Installation And Service Instructions Manual page 143

Refrigerant circuit flowchart
Labelling of the sensors in acc. with EN 1861:
High pressure sensor
Low pressure sensor
Temperature sensor
High pressure switch PSH
High limit safety cut-out
Heating mode
qP
qQ
9
8
5
7
6
4
3
2
Fig. 86
Evaporator
1
Air discharge
2
Air intake temperature sensor
3
Air intake
4
5 Electronic expansion valve 1
Liquid gas temperature sensor, heating
6
Schrader valve, high pressure side 2
7
Filter, electronic expansion valve 1
8
Secondary circuit return
9
Secondary circuit flow
qP
Secondary circuit flow temperature sensor
qQ
qW Condenser
Liquid gas temperature sensor, condenser
qE
qW
qU
qZ
qE
qR
eQ
eP
eW
eE
1
Flow rates:
■ Secondary side (heating water)
Min. flow rate: 0.350 m
Max. flow rate: 2.050 m
Primary side (air)
■
Min. air flow rate: 2900 m
Max. air flow rate: 5300 m
wP
qO
qI
qT
wI
wO
wU
Heat exchanger
qR
Inverter
qT
Refrigerant collector
qZ
qU Schrader valve, high pressure side 1
Inverter temperature sensor
qI
Suction gas temperature sensor, evaporator
qO
4-way diverter valve
wP
High pressure sensor
wQ
High pressure switch PSH
wW
Hot gas temperature sensor
wE
wR High limit safety cut-out
Compressor temperature sensor
wT
Compressor
wZ
Outdoor unit maintenance
3
/h (350 l/h)
3 /h (2050 l/h)
3
/h
3
/h
wW
wQ
wE
wR
wZ
wT
143