Controller And Sensor Pcb (Lv Connections) - Viessmann VITOCAL 242-G Installation And Service Instructions Manual

Electrical connections
Terminals Function
X3.8 Pressure switch, primary circuit
X3.9 and/or
P
Frost stat
or
Jumper
X3.18 Heat pump control unit power supply
X2.1 230 V~
X1.1

Controller and sensor PCB (LV connections)

Set the required parameters during commissioning:
see page 43 onwards.
Plug Sensor
F0.1/F0.2 Outside temperature sensor
F0.2/F0.3 Radio clock receiver
F4 Buffer temperature sensor
F11 Contact humidistat 24 V
Note
If the contact humidistat of the NC-Box is used when cooling, set jumper,
otherwise the heat pump will not start (message "CA Protectn device prim-
ry").
F13 Flow temperature sensor, system (downstream of heating water buffer cylin-
der)
(cont.)
–
Explanation
Note
No parameters need to be set
■
The compressor is "forced" off as soon as the contact
■
opens.
The power-OFF contact signal switches off the supply
■
voltage to the relevant components, subject to power
supply utility.
For the instantaneous heating water heater, the
■
stages to be switched off can be selected (parameter
"Output for Instant.htg wtr heater at power-OFF
790A").
The power supply for the heat pump control unit
■
2
(3 x 1.5 mm ) and the cable for the power-OFF signal
can be combined in a single 5-core cable.
Further information on power-OFF: See chapter
■
"Power supply".
In connection with Smart Grid:
Do not connect the power-OFF signal.
Do not remove 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.
See chapter "Power supply".
Installation sequence
Type
NTC 10 k
Ω
DCF
NTC 10 k
Ω
―
NTC 10 k
Ω
27