Checking Sensors - Viessmann VITOCAL 200-G Installation And Service Instructions Manual

Troubleshooting
Repairs
(cont.)
S Safety high pressure switch
U Filter dryer
W Drain valve, primary side
X Temperature limiter (Klixon), hot
gas
Draining the heat pump on the primary/secondary side
1. Shut off the connection to the heating
network.

Checking sensors

Sensor connections to the controller and
sensor PCB.
Temperature sensors type Ni500
640
600
560
520
480
440
400
-40 -20 0
Temperature in °C
80
40
20 60
2. Drain heat pump at drain valve on pri-
mary/secondary side (see page 78).
For the position of the sensors in the heat
pump, see diagram on page 78.
Capturing element: "Ni500"
■ Outside temperature sensor (F0)
■ Flow temperature sensor, heating cir-
cuit M2 (F12)
■ Flow temperature sensor, separate
cooling circuit
■ Room temperature sensors