Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 100

Troubleshooting
Repairs
(cont.)
External unit, type AWT-AC 221.A04
B
A
A Fan
B Heat exchanger (evaporator)
C Evaporator air intake temperature
sensor (OAT)
D Evaporator temperature sensor
(OMT)
E 4-way diverter valve
100
C
F Electronic expansion valve (EEV)
G Compressor head temperature sen-
sor (CTT)
H Liquid separator
K Evaporator refrigerant inlet temper-
ature sensor (OCT)
L Compressor
D
E
G
F
K
H
L