83
O
Receiver
P
Electronic expansion valve
R
Schrader valve, high pressure side
S
Refrigerant circuit controller temperature sensor
(T2)
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 com-
ponents: Internal unit").
Checking the temperature sensors
Connection to the indoor unit
Temperature sensor
Test element
Connection
■
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensors top (F6) and bottom (F7)
■
Flow temperature sensor, system (F13)
■
Cooling circuit flow temperature sensor (direct heating cir-
cuit A1/HC1 or separate cooling circuit SKK) (F14)
■
Boiler water temperature sensor, external heat generator
(F20)
■
For heat pump cascades: Buffer outlet temperature sensor
(F23)
■
Room temperature sensors
NTC 10 k
Ω
Controller and sensor PCB: See
page 41.
■
For heat pump cascades: Swimming pool flow temperature
sensor (F21)
NTC 20 k
Ω
Controller and sensor PCB: See
page 41.
■
Secondary circuit flow temperature sensor (F8)
■
Return temperature sensor, secondary circuit (F9)
■
Secondary circuit flow temperature sensor upstream of in-
stantaneous heating water heater (F3)
■
Reversible suction gas temperature sensor (F24)
■
Liquid gas temperature sensor (F25)
Pt500A
(PTC)
Controller and sensor PCB: See
page 41.
Connection to the outdoor unit
Temperature sensor
Test element
Connection
■
Refrigerant circuit controller temperature sensor (T2)
■
Compressor suction gas temperature sensor (T4)
■
Air intake temperature sensor (T5)
■
Hot gas temperature sensor (T6)
■
Evaporator suction gas temperature sensor (T7)
NTC 10 k
Ω
Refrigerant circuit controller in
outdoor unit (observe label on
the outdoor unit): See page 81.
Maintenance
Overview of internal components: outdoor unit
(cont.)
5790 931 GB
Maintenance
