Draining Heat Pump On The Secondary Side - Viessmann VITOCAL 222-G Series Installation And Service Instructions For Contractors

Overview of internal components
High limit safety cut-out, instantaneous heating
N
water heater
Primary circuit drain & fill valve
O
Electronic expansion valve
P
Primary pump
R
S Low pressure Schrader valve
High pressure Schrader valve
T
Low pressure sensor
U
Filter
V
Safety high pressure switch
W
High pressure sensor
X
Evaporator
Y
F3 Primary circuit return temperature sensor
(Viessmann Pt500A)
Note regarding the temperature sensors
F.. Temperature sensor is connected to the controller
and sensor PCB.
T.. Temperature sensor is connected to EEV PCB.

Draining heat pump on the secondary side

1. Close the on-site boiler drain and fill valve.
2. Draining the heating water side
Connect the hose to the secondary circuit drain &
fill valve: See chapter "Overview of internal compo-
nents" on page 66.
Open the secondary circuit drain & fill valve.
Checking the temperature sensors
For PCB locations in the heat pump: See page 64.
Sensor
Outside temperature sensor (F0)
■
Buffer temperature sensor (F4)
■
Cylinder temperature sensor (F6)
■
Flow temperature sensors for heating circuits
■
M2/HC2 (F12)
System flow temperature sensor (F13)
■
Flow temperature sensor for cooling circuit: Heating
■
circuit without mixer A1/HC1 or separate cooling cir-
cuit SKK (F14)
Room temperature sensors
■
Return temperature sensor, primary circuit (F3)
■
Flow temperature sensor for secondary circuit (T1)
■
Flow temperature sensor for secondary circuit, up-
■
stream of instantaneous heating water heater (T2)
Secondary circuit return temperature sensor (T3)
■
Suction gas temperature sensor (T4)
■
Flow temperature sensor for primary circuit (T5)
■
Hot gas temperature sensor (T6)
■
Liquid gas temperature sensor (T7)
■
(cont.)
F6 Cylinder temperature sensor (Viessmann
NTC 10 k
T1 Secondary circuit flow temperature sensor
(NTC 10 k
T2 Secondary circuit flow temperature sensor down-
stream of instantaneous heating water heater
(NTC 10 k
T3 Secondary circuit return temperature sensor
(NTC 10 k
T4 Suction gas temperature sensor (NTC 10 k
T5 Primary circuit flow temperature sensor
(NTC 10 k
T6 Hot gas temperature sensor (NTC 10 k
T7 Liquid gas temperature sensor (NTC 10 k
"Vitotronic 200" service instructions
3. Draining the DHW side
See chapter "Draining the appliance on the DHW
side" on page 50.
For sensor locations in the heat pump: See page 66.
Test element
Viessmann NTC 10 k
(blue ID label)
Viessmann Pt500A (green
marking)
NTC 10 k (no marking)
Ω
)
Ω
)
Ω
)
Ω
)
Ω
)
Ω
Connection
Controller and sensor PCB
Ω
Controller and sensor PCB
EEV PCB
Maintenance
)
Ω
)
Ω
)
Ω
67