75
qT
Filter dryer
qZ
Only type WW 302.B125, WW 302.B155, WW 302.B200, WW 302.B250 and WW 302.B300:
Second parallel filter dryer
qU
Condenser
qI
Evaporator
qO
Primary circuit return temperature sensor (heat pump brine outlet)
wP
Secondary circuit flow temperature sensor
wQ
Primary circuit flow temperature sensor (heat pump brine inlet)
wW
Flow switch
wE
Frost stat
wR
Temperature sensor for frost stat
wT
Sight glass, if installed
Draining the heat pump on the primary/secondary side
Drain the heat pump at the on-site drain valve on the
primary/secondary side.
Checking sensors
Sensor
Test element
Connection/installation
position
■
Outside temperature sensor
■
Flow temperature sensor, secondary circuit
■
Flow temperature sensor, cooling circuit
Pt 1000
See separate wiring dia-
gram
■
Buffer temperature sensor
■
Cylinder temperature sensor
■
Flow/return temperature sensor, secondary circuit
Pt 1000
All sensors in the heat pump refrigerant circuit
Sensors
Terminals
Sensor
Type
14X1
Suction gas temperature sensor
Heat pump
Pt 1000 (PTC)
14X2
Temperature sensor
Evaporator inlet
Pt 1000 (PTC)
14X4
Temperature sensor
Evaporator outlet
Pt 1000 (PTC)
14X5
Temperature sensor
Condenser inlet
Pt 1000 (PTC)
14X7
Temperature sensor
Condenser outlet
Pt 1000 (PTC)
15X3
Pressure transmitter
Low pressure
Heat pump
TRFG ND18
0...10 V
15X5
Pressure transmitter
High pressure
Heat pump
TRFG HD50
0...10 V
Troubleshooting
Repairs
(cont.)
5549 991 GB
Service
Содержание 301.BS090
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