Dhw Cylinder Drain & Fill Valve Positions; Draining The Heat Pump On The Secondary Side; Checking The Sensors - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Maintenance
DHW cylinder drain & fill valve positions
Fig. 46
Closed
A
Open to drain the internal DHW line
B
Open to drain or fill the cylinder
C

Draining the heat pump on the secondary side

1. Close the on-site boiler drain & fill valve.

Checking the sensors

For sensor connections to the controller and sensor
PCB: see page 27.
Sensor
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensor (F6)
■
Flow temperature sensor, system (F13)
■
Flow temperature sensor, cooling circuit (direct heating circuit A1/HC1 or separate
■
cooling circuit SKK) (F14)
Return temperature sensor, solar circuit (F23)
■
Room temperature sensors
■
Collector temperature sensor (F21)
■
Flow temperature sensor, secondary circuit (F8)
■
Return temperature sensor, secondary circuit (F9)
■
56
A
B
C
2. Drain heat pump at drain valve on secondary side:
see Fig. 45.
For the position of the sensors in the heat pump: see
Fig. 45.
Capturing element
NTC 10 k
Ω
NTC 20 k
Ω
Pt 500A