Viessmann BW 301.C090, Installation And Service Instructions For Contractors

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42
Controller and sensor PCB
193C
aVG
F23
F0
sVA
X31
X25
X15
X24
X18
F26
F20
F21
F14
F16
F12
F13
F7 F8
F6
F4
F27
F11
193A
193B
20
1
J3
J4
X2
X3
X20
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
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
aVG
KM-BUS
a:D A
Connection, PWM signal, primary pump
a:D B
Connection, PWM signal, secondary pump
a:D C
Connection, PWM signal, cylinder loading
pump
sVA
Connection, Modbus 2 (cores interchangeable)
Connection, energy meter
■ 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).
Installation sequence
Electrical connections
(cont.)
5787 232 GB
Installation