Viessmann VITOCAL 222-S Installation And Service Instructions Manual page 73

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 (F6)
■
Flow temperature sensor, system (F13)
■
Flow temperature sensor, cooling circuit (di-
■
rect heating circuit A1/HC1 or separate cool-
ing circuit SKK) (F14)
Room temperature sensors
■
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)
Compressor head temperature sensor (hot
■
gas) (CTT)
Internal unit: Viessmann NTC 10 k
Outside temperature sensor
200
100
80
60
40
20
10
8
6
-20 -10 0
Temperature in °C
Fig. 62
Test ele-
ment
NTC 10 k
Pt500A
(PTC)
NTC 10 k
NTC 10 k
NTC 50 k
(marked blue)
Ω
10 20 30
2. Drain the heat pump at the secondary circuit fill &
drain valve (see chapter "Overview of internal com-
ponents: Internal unit").
Installed location
Internal unit (see
Ω
page 68)
Internal unit (see
page 68)
Internal unit (see
Ω
page 68)
External unit (see
Ω
page 69)
External unit (see
Ω
page 69)
Other sensors
20
10
8
6
4
2
1
0.8
0.6
0.4
10 30 50
Temperature in °C
Fig. 63
Maintenance
Connection
Controller and sensor
PCB (see page 33)
Controller and sensor
PCB (see page 33)
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)
70 90 110
73