Controller And Sensor Pcb - Viessmann Vitocal 300-G Pro Installation And Service Instructions For Contractors

Installation sequence
Electrical connections

Controller and sensor PCB

X2
X3
sVA
J3
J4
X18
F23
F26
Fig. 27
F.. Connections for temperature sensors: see the
following table.
J3 Jumper for terminator Modbus 2
Terminator enabled
Terminator disabled
J4 Jumper for setting master/slave, Modbus 2
Heat pump control unit is slave.
Heat pump control unit is master.
X2 Connection, power supply to main PCB
X3 Connection, connecting lead to main PCB
X15 Internal connection, KM-BUS
X18 Connection, Modbus 1: Viessmann appliances
If other Viessmann appliances are to be con-
nected, plug in the Modbus distributor (acces-
sories).
X20 Programming unit connection
■ Set the required parameters during commissioning;
see from page 53.
Connections, see separate "Connection and wiring
■
diagram".
Sensors
Note
The flow temperature sensor for one heating cir-
cuit with mixer (M3/HC3) is connected to the mixer
extension kit (accessories).
42
(cont.)
X20
X31
F20 F12 F4
F21 F13 F27
F14 F7 F8
F16 F11 F6
1
F0
20
X24
aVG
X24 Slot for LON communication module
X25 / : Terminals for internal sensors and
components
: Connections for connecting cable
(LV) to the heat pump control panel
or wiring chamber
X31 Slot for coding card
KM-BUS
aVG
Connection, PWM signal, primary pump
a:DA
Connection, PWM signal, secondary pump
a:DB
Connection, PWM signal, cylinder loading
a:DC
pump
Connection, Modbus 2 (cores interchangeable)
sVA
Connection, energy meter