Viessmann VITOCAL 111-S - Checking the Temperature Sensors

91
A
B
Fig. 75
A
Drain and fill valve, secondary side
B
Drain and fill valve, DHW side
1. Close the on-site boiler drain & fill valve.
2. Draining the heating water side
Connect the hose to the drain and fill valve of the
secondary circuit.
Open the secondary circuit drain and fill valve.
3. Draining the DHW side
See chapter "Draining the appliance on the DHW
side", page 67.
Checking the temperature sensors
Connection to the indoor unit
Temperature sensors are connected to the controller
and sensor PCB: See page 46.
Temperature sensor Test element
■
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensor (F6 or X25.5/X25.6, see service instructions for "Vitotronic
200, type WO1C")
■
Flow temperature sensor, heating circuit with mixer M2/HC2 (F12)
■
Cooling circuit flow temperature sensor (direct heating circuit A1/HC1 or separate cool-
ing circuit SKK) (F14)
■
Room temperature sensors
NTC 10 kΩ
■
Flow temperature sensor for secondary circuit (F8)
■
Secondary circuit return temperature sensor (F9)
■
Secondary circuit flow temperature sensor upstream of instantaneous heating water
heater (F3)
■
Reversible suction gas temperature sensor (F24)
■
Liquid gas temperature sensor (F25)
Pt500A
(PTC)
Connection to the outdoor unit
Temperature sensors are connected to the refrigerant
circuit controller in the outdoor unit: See page 88.
Maintenance
Draining heat pump on the secondary side
6199592
Maintenance