Viessmann Vitocal 200-S Installation And Service Instructions Manual page 66

Maintenance
Draining secondary side heat pump
1. Close the on-site boiler drain & fill valve.
Checking the sensors
Sensor
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensor, top (F6) and
■
bottom (F7)
Flow temperature sensor, system (F13)
■
Flow temperature sensor, cooling circuit (di-
■
rect heating circuit A1/HC1 or separate cool-
ing circuit SKK) (F14)
Boiler water temperature sensor, external
■
heat source (F20)
With heat pump cascades: Buffer tempera-
■
ture sensor (F23)
Room temperature sensors
■
With heat pump cascades: Flow temperature
■
sensor, swimming pool (F21)
Flow temperature sensor, secondary circuit
■
(F8)
Return temperature sensor, secondary circuit
■
(F9)
Flow temperature sensor, secondary circuit
■
upstream of instantaneous heating water
heater (LWT)
Liquid gas temperature sensor (IRT)
■
Temperature sensor, refrigerant inlet, evapo-
■
rator (OCT)
Temperature sensor, evaporator (OMT)
■
Temperature sensor, air intake, evaporator
■
(OAT)
Temperature sensor, compressor head (hot
■
gas) (CTT)
66
2. Drain the heat pump at the secondary circuit fill &
drain valve (see chapter "Overview of internal com-
ponents: Internal unit").
Test ele- Installed location
ment
NTC 10 k Internal unit (see
Ω
page 62)
NTC 20 k Internal unit (see
Ω
page 62)
Pt500A Internal unit (see
(PTC) page 62)
NTC 10 k Internal unit (see
Ω
page 62)
NTC 10 k External unit (see
Ω
page 62)
NTC 50 k External unit (see
Ω
page 62)
Connection
Controller and sensor
PCB (see page 30)
Controller and sensor
PCB (see page 30)
Controller and sensor
PCB (see page 30)
AVI PCB (see service
instructions
"Vitotronic 200,
type WO1C")
Refrigerant circuit con-
troller (observe label on
the external unit)
Refrigerant circuit con-
troller (observe label on
the external unit)