Draining The Heat Pump On The Primary/Secondary Side; Checking Sensors; Temperature Sensors Type Pt 1000 - Viessmann BW 30 .CS Series Installation And Service Instructions Manual

Repairs
Overview of internal components, Vitocal 300-G
Compressor 2
7
(only type BW 302.CS090 to BW 302.CS230)
Compressor 1
8
Sight glass, oil level, compressor 1 and 2
9
(only type BW 302.CS090 to BW 302.CS230)
Filter dryer
qP
2nd parallel filter dryer
qQ
(only type BW 302.CS090 to BW 302.CS230)
Plate condenser
qW
Plate evaporator
qE
Return temperature sensor, primary circuit (outlet)
qR
Flow temperature sensor, secondary circuit (outlet)
qT
Flow temperature sensor, primary circuit (inlet)
qZ
Return temperature sensor, secondary circuit (inlet)
qU
Sight glass, refrigerant
qI
Vibration absorber
qO
Schrader valve
wP
Dryer bracket
wQ
Contact temperature sensor (beneath the insulation); see position 0008 on page 54
wW

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
Outside temperature sensor
■
Flow temperature sensor, secondary circuit
■
Flow temperature sensor, cooling circuit
■
Buffer temperature sensor
■
Cylinder temperature sensor
■
Flow/return temperature sensor, secondary circuit
■
Contact temperature sensor
■

Temperature sensors type Pt 1000

1600
1500
1400
1300
1200
1100
1000
900
800
-50 0 50
Temperature in °C
Fig. 26
50
100 150
(cont.)
Test element
Pt 1000
Pt 1000
Note
All sensors can be checked via the temperature
displays in the program. If a sensor still needs to
be tested directly, one of the 2 sensor connections
must be separated from the controller. Otherwise
the measuring device will indicate false values or
can sustain damage.
Connection/installation
position
See separate wiring dia-
gram