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Draining secondary side heat pump
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: Overview of internal components".
Checking the temperature sensors
Connection to the indoor unit
Temperature sensors are connected to the controller and sensor PCB:
Temperature sensor
Test element
■
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensors top (F6) and bottom (F7)
■
System flow temperature sensor (F13)
■
Cooling circuit flow temperature sensor (direct heating circuit
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 kΩ
■
For heat pump cascades: Swimming pool flow temperature
sensor (F21)
NTC 20 kΩ
■
Secondary circuit flow temperature sensor (F8)
■
Secondary circuit return temperature sensor (F9)
■
Secondary circuit flow temperature sensor upstream of
instantaneous heating water heater (F3)
■
Reversible suction gas temperature sensor (F24)
■
Liquid gas temperature sensor (F25)
Pt500A
(PTC)
