Connecting The Primary Circuit Flow/Return Temperature Sensor, 2-Stage Heat Pump - Viessmann Vitocal 300-G Series Installation And Service Instructions Manual

Installation sequence
Electrical connection
Plug Sensor
PWM signal, primary pump
a:DA
PWM signal, secondary pump
a:DB
PWM signal, circulation pump for cylinder heating
a:DC
Note
Flow temperature sensor for heating circuit with
mixer M3/HC3: The flow temperature sensor for one
heating circuit with mixer M3/HC3 is connected to the
mixer extension kit (accessories).

Connecting the primary circuit flow/return temperature sensor, 2-stage heat pump

aS
aS
[XG aD
X
[G
X
Fig. 20
Flow temperature sensor, primary circuit
aS
Return temperature sensor, primary circuit
aD
!
Please note
Unmarked sensor leads cannot be uniquely
identified, e.g. during diagnosis.
Mark sensor leads.
32
(cont.)
2.
aD
3.
aS
aD
1.
<42 V
aS
aD
aS
aD
!
Please note
If sensor lead wires drift into the adjacent volt-
age area, this can cause appliance damage,
e.g. when a wire comes loose.
Secure sensor leads and stripped leads (with
plug / ) to the other low voltage leads using
aS aD
the cable ties provided.
Type