97
Draining secondary side heat pump
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 components:
Internal unit").
Checking the sensors
Sensor
Captur-
ing ele-
ment
Installed loca-
tion
Connection to
■ Outside temperature sensor (F0)
■ Cooling circuit flow temperature
sensor (direct heating circuit A1/
HC1 or separate cooling circuit
SKK) (F14)
■ Room temperature sensors
Ni 500
Internal unit (see
page 91)
Controller and
sensor PCB (see
page 55)
■ Buffer temperature sensor (F4)
■ Cylinder temperature sensor (F6)
■ System flow temperature sensor
(F13)
Pt 500
■ Compressor head temperature
sensor (hot gas) (CTT)
NTC
50 kΩ
External unit
(see page 93)
Refrigerant circuit
controller
(observe label in
the external unit)
■ Secondary circuit flow tempera-
ture sensor upstream of instanta-
neous heating water heater
(LWT)
■ Liquid gas temperature sensor
(IRT)
NTC
10 kΩ
Internal unit (see
page 48)
AVI PCB (see
page 55)
■ Evaporator refrigerant inlet tem-
perature sensor (OCT)
■ Evaporator temperature sensor
(OMT)
■ Evaporator air intake tempera-
ture sensor (OAT)
External unit
(see page 93)
Refrigerant circuit
controller
(observe label in
the external unit)
Troubleshooting
Repairs
(cont.)
5600 950 GB
Service
