Draining Heat Pump On The Secondary Side; Checking Sensors; Viessmann Ntc 10 K Ω (Marked Blue) - Viessmann Vitocal 300-A Installation And Service Instructions Manual

Maintenance

Draining heat pump on the secondary side

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

Checking sensors

■ Sensor connections to the controller and sensor
PCB: See page 28.
Sensor locations in the heat pump: See diagram 51
■
on page 65.
Sensor
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensor, top (F6)
■
Cylinder temperature sensor, bottom (F7)
■
Flow temperature sensor, heating circuit with mixer M2/HC2 (F12)
■
System flow temperature sensor (F13)
■
Flow temperature sensor, cooling circuit (heating circuit without mixer A1/HC1 or sep-
■
arate cooling circuit SKK) (F14)
Room temperature sensor for separate cooling circuit (F16)
■
Boiler water temperature sensor, external heat generator (F20)
■
Buffer temperature sensor, cooling (F26)
■
Room temperature sensors
■
Sensors in the refrigerant circuit
■
Flow temperature sensor, secondary circuit (F8)
■
Return temperature, secondary circuit (X25.11/X25.12)
■
Temperature sensor, air intake (X25.1/X25.2)
■
Temperature sensor, air discharge (X25.3/X25.4)
■
Viessmann NTC 10 k
Ω
Outside temperature sensor
200
100
80
60
40
20
10
8
6
-20 -10 0
Temperature in °C
Fig. 52
66
(marked blue)
10 20 30
2. Drain heat pump at drain valve: See Fig. 51.
Further sensors
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50
Temperature in °C
Fig. 53
Test element
NTC 10 k
Ω
Pt500A
70 90 110