83
?
Flow temperature sensor, secon-
dary circuit
aJ
Return temperature sensor, secon-
dary circuit
sG
Secondary pump
lJ
3-way diverter valve for "Central
heating/DHW heating"
A
Liquid gas temperature sensor (IRT)
B
Condenser
C
Pressure sensor (ITC) for determin-
ing the condenser condensation
temperature
D
Secondary circuit temperature sen-
sor upstream of the instantaneous
heating water heater (LWT)
E
Air vent valve, secondary circuit
F
High limit safety cut-out for the
instantaneous heating water heater
(type AWB-AC only)
G
Instantaneous heating water heater
(type AWB-AC only)
H
Drain & fill valve, secondary circuit
Overview of internal components: External unit
Danger
Contact with 'live' components
can result in severe injuries.
Capacitors remain 'live' after the
power supply has been switched
OFF.
Wait at least 4 min, until the
capacitors have discharged,
before starting work on the exter-
nal unit.
Troubleshooting
Repairs
(cont.)
5782 176 GB
Service
