Viessmann AWT 221.A04, Installation And Service Instructions For Contractors

Page: 38 / 140

38
Terminals Function Explanation
X3.8
X3.9 Frost stat and/or contact humidistat,
cooling
or
Jumper
Requires floating N/C contact:
■
Closed: Continuous safety chain
■
Open: Safety chain interrupted; heat pump shut down
■
Breaking capacity 230 V~, 0.15 A
Connection:
■
Connected in series if both safety components are in-
stalled
■
Insert jumper if no safety components are instal-
led.
X3.18
X2.1
X1.1 Heat pump control unit power supply
230 V~ See chapter "Power supply".
Indoor unit: controller and sensor PCB (LV connections)
Set the required parameters during commissioning:
see page 59 onwards.
Plug Sensor Type
F0.1/F0.2 Outside temperature sensor NTC 10 k
Ω
F0.2/F0.3 Radio clock receiver (accessories) DCF
F4 Buffer temperature sensor NTC 10 k
Ω
F11 Contact humidistat 24 V
–
Note
If a 230 V~ contact humidistat (connection to X3.8/X3.9) is used for cooling,
insert a jumper , otherwise the heat pump will not start (message "CA Pro-
tectn device primry" ).
―
F13 Flow temperature sensor, system (downstream of heating water buffer cylin-
der) NTC 10 k
Ω
F14 Flow temperature sensor, cooling circuit (heating circuit without mixer A1/HC1
or separate cooling circuit SKK) NTC 10 k
Ω
F16 Room temperature sensor, cooling circuit
■
Required for separate cooling circuit SKK
■
Recommended for heating/cooling circuit without mixer A1/HC1
NTC 10 k
Ω
aVG
KM-BUS (wires interchangeable)
Use the KM-BUS distributor (accessories) if several devices are connected.
KM-BUS subscribers (examples):
■
Extension kit, mixer for heating circuit M2/HC2
■
Remote control Vitotrol 200-A or Vitotrol 300 (set the heating circuit assign-
ment at the remote control)
■
EA1 extension, AM1 extension
■
Communication interface Vitocom 100, type GSM2
—
sVA
Modbus 2 (wires not interchangeable)
Connection for electricity meter of photovoltaic system
—
J3 Jumper for terminator Modbus 2
Terminator enabled (delivered condition)
Terminator disabled
—
J4 Jumper for setting master/slave Modbus 2
Heat pump control unit is slave
Heat pump control unit is master (delivered condition)
—
Installation sequence
Electrical connection
(cont.)
5776 028 GB
Installation