87
Q
Hot gas temperature sensor
R
Low pressure sensor EEV
S
High pressure Schrader valve
T
Low pressure Schrader valve
U
Evaporator
Draining the heat pump on the primary/secondary side
1.
Shut off the connection to the heating
network.
2.
Drain heat pump at drain valve on pri-
mary/secondary side (see page 86).
Checking sensors
Sensor connections to the controller and
sensor PCB: See page 49.
Sensor locations in the heat pump: See
diagram on page 86.
Sensor
Test element
■ Outside temperature sensor (F0)
■ Buffer temperature sensor (F4)
■ Cylinder temperature sensor, top (F6)
■ Cylinder temperature sensor, bottom (F7)
■ Flow temperature sensor, heating circuit with mixer M2/HC2
(F12)
■ System flow temperature sensor (F13)
■ Flow temperature sensor, cooling circuit (heating circuit without
mixer A1/HC1 or separate cooling circuit SKK)(F14)
■ Room temperature sensors for separate cooling circuit (F16)
■ Boiler water temperature sensor, external heat generator (F20)
■ Buffer temperature sensor, cooling (F26)
■ Room temperature sensors for heating circuits
NTC 10 kΩ
■ Flow temperature sensor, primary circuit (F2)
■ Return temperature sensor, primary circuit (F3)
■ Flow temperature sensor, secondary circuit, in a two-stage heat
pump for heat pump stage 1 (F8)
■ Return temperature sensor, secondary circuit, in a two-stage
heat pump for heat pump stage 1 (F9)
■ Return temperature sensor, secondary circuit for heat pump
stage 2 (F18)
■ Flow temperature sensor, secondary circuit for heat pump stage
2 (F27)
■ Sensors in the refrigerant circuit
Pt500A
(PTC)
Troubleshooting
Repairs
(cont.)
5546 267 GB
Service
