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1. Close the on-site boiler drain & fill valve. 2. Drain the heat pump at the drain & fill valve in the
secondary circuit: See chapter "Indoor unit: Over-
view of internal components".
Checking the temperature sensors
Connection to the indoor unit
Temperature sensors are connected to the controller
and sensor PCB: See page 46.
Temperature sensor Test element
■
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensors top (F6) and bottom (F7)
■
Flow temperature sensor, heating circuit with mixer M2/HC2 (F12)
■
System flow temperature sensor (F13)
■
Cooling circuit flow temperature sensor (direct heating circuit A1/HC1 or separate cool-
ing circuit SKK) (F14)
■
Room temperature sensor, cooling circuit (F16)
■
Boiler temperature sensor, external heat generator (F20)
■
For heat pump cascades: Buffer outlet temperature sensor (F23)
■
Room temperature sensors
NTC 10 kΩ
■
For heat pump cascades: Swimming pool flow temperature sensor (F21) NTC 20 kΩ
■
Secondary circuit flow temperature sensor upstream of instantaneous heating water
heater (F3)
■
Secondary circuit flow temperature sensor (F8)
■
Secondary circuit return temperature sensor (F9)
■
Reversible suction gas temperature sensor (F24)
■
Liquid gas temperature sensor (F25)
Pt500A
(PTC)
Connection to the outdoor unit
Temperature sensors are connected to the refrigerant
circuit controller in the outdoor unit (see label in the
outdoor unit): See page 87.
Temperature sensor Test element
■
Defrost temperature sensor (defrosting):
RT1 for type 101.A12/A14/A16
RT14 for type 101.B04/B06/B08
■
Suction gas temperature sensor (suction):
RT4 for type 101.A12/A14/A16
RT17 for type 101.B04/B06/B08
NTC 20 kΩ
■
Air inlet temperature sensor (outdoor):
RT2 for type 101.A12/A14/A16
RT15 for type 101.B04/B06/B08
NTC 15 kΩ
■
Hot gas temperature sensor (discharged):
RT3 for type 101.A12/A14/A16
RT16 for type 101.B04/B06/B08
NTC 50 kΩ
Maintenance
Draining secondary side heat pump
6199585
Maintenance
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