Draining The Heat Pump On The Primary/Secondary Side - Viessmann Vitocal 300-G Pro Series Installation And Service Instructions For Contractors

Overview of internal components
Vibration absorber
qO
Schrader valve
wP

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
For the position of the sensors in the heat pump: See
Fig. 41.
Sensor
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensor (F6/F7)
■
Flow temperature sensor, heating circuit M2/HC2 (F12)
■
System flow temperature sensor (F13)
■
Flow temperature sensor, cooling circuit (heating circuit without mixer A1/HC1 or
■
separate cooling circuit SKK) (F14)
Boiler water temperature sensor, external heat generator (F20)
■
Room temperature sensors
■
All sensors in the heat pump refrigerant circuit
■
Flow/return temperature sensors, primary circuit/secondary circuit (X25)
■
Temperature sensors, type NTC 10 kΩ
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50 70
Temperature in °C
Fig. 42
(cont.)
90 110
Immersion temperature sensor
wW
Ball shut-off valve with Schrader valve
wE
For sensor connections: See controller and sensor
PCB, page 42.
Repairs
Test element
NTC 10 kΩ
Pt500A (PTC)
65