72
1.
Close the on-site boiler drain & fill valve.
2.
Drain the heat pump at the secondary circuit fill &
drain valve (see chapter "Overview of internal com-
ponents: Internal unit").
Checking the sensors
Sensor
Test ele-
ment
Installed location
Connection
■
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensor (F6)
■
Flow temperature sensor, system (F13)
■
Flow temperature sensor, cooling circuit (di-
rect heating circuit A1/HC1 or separate cool-
ing circuit SKK) (F14)
■
Return temperature sensor, solar circuit (F23)
■
Room temperature sensors
NTC 10 k
Ω
Internal unit (see
page 67)
Controller and sensor
PCB (see page 33)
■
Flow temperature sensor, secondary circuit
(F8)
■
Return temperature sensor, secondary circuit
(F9)
Pt500A
(PTC)
Internal unit (see
page 67)
Controller and sensor
PCB (see page 33)
■
Flow temperature sensor, secondary circuit
upstream of instantaneous heating water
heater (LWT)
■
Liquid gas temperature sensor (IRT)
NTC 10 k
Ω
Internal unit (see
page 67)
AVI PCB (see service
instructions for
Vitotronic 200,
type WO1C)
■
Temperature sensor, refrigerant inlet, evapo-
rator (OCT)
■
Temperature sensor, evaporator (OMT)
■
Temperature sensor, air intake, evaporator
(OAT)
NTC 10 k
Ω
External unit (see
page 68)
Refrigerant circuit con-
troller (observe label on
the external unit)
■
Collector temperature sensor (F21)
NTC 20 k
Ω
Internal unit (see
page 67)
Controller and sensor
PCB (see page 33)
■
Compressor head temperature sensor (hot
gas) (CTT)
NTC 50 k
Ω
External unit (see
page 68)
Refrigerant circuit con-
troller (observe label on
the external unit)
Maintenance
Draining secondary side heat pump
5700 582 GB
Maintenance
