Controller And Sensor Pcb (Low Voltage Connections) - Viessmann VITOCAL 222-G Series Installation And Service Instructions For Contractors

Electrical connection
Terminals Function
X3.8
X3.9
Pressure switch, primary circuit
P
and/or
Frost stat
or
Jumper
X3.12 "External demand" signal: Exter-
X3.13 nal starting of compressor and
or at external EA1 pumps, mixer in control mode or
extension OPEN, changeover of the operat-
ing status of several system com-
ponents
X40 Heat pump control unit power sup-
ply:
Phase L1
X40.
X40.N Neutral conductor termi-

Controller and sensor PCB (low voltage connections)

Set the required parameters during commissioning:
See page 51 onwards.
Plug Sensor/component
F0 Outside temperature sensor
F4 Buffer temperature sensor
F12 Flow temperature sensor, heating circuit with mixer M2/HC2
F14 Flow temperature sensor, cooling circuit: Heating circuit without mixer
A1/HC1 or separate cooling circuit SKK
F16 Room temperature sensor, cooling circuit
Required for separate cooling circuit SKK
■
Recommended for heating/cooling circuit without mixer A1/HC1
■
KM-BUS (wires interchangeable)
aVG
Use the KM-BUS distributor (accessories) if several devices are connected.
KM-BUS subscribers (examples):
Mixer extension kit for heating circuit M3/HC3
■
Remote control (set heating circuit allocation on the remote control)
■
EA1 extension, AM1 extension
■
Modbus (do not interchange the wires), e.g. connection for energy meter of
sVA
photovoltaic system
(cont.)
Earth conductor terminal
?
nal
Explanation
Requires floating contact:
Closed: Safety chain has continuity
■
Open: Safety chain interrupted; heat pump shut down
■
Breaking capacity 230 V~, 0.15 A
■
Connection:
Connected in series if 2 safety components are instal-
■
led
Insert jumper if no safety components are instal-
■
led.
Requires floating contact:
Closed: Demand
■
Open: No demand
■
Breaking capacity 230 V~, 2 mA
■
Note
These and further external functions (e.g. provision of
external set values) can alternatively be connected via
the external EA1 extension.
See "EA1 extension" installation instructions
Power supply 230 V~: See chapter "Power supply".
Installation sequence
Type
NTC 10 k
Ω
NTC 10 k
Ω
NTC 10 k
Ω
NTC 10 k
Ω
NTC 10 k
Ω
—
—
31