Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 70

Maintenance
Overview of internal components: External unit
External unit 4 kW, type AWT/AWT-AC 221.A04
B
A
Fig. 59
Fan
A
Heat exchanger (evaporator)
B
Temperature sensor, air intake, evaporator (OAT)
C
Evaporator temperature sensor (OMT)
D
4-way diverter valve
E
High pressure switch (pHi)
F
70
(cont.)
C
Compressor head temperature sensor (CTT)
G
Electronic expansion valve (EEV)
H
Temperature sensor, refrigerant inlet, evaporator
K
(OCT)
Liquid separator
L
Compressor
M
D
E
F
G
H
K
L
M