46
Connection parameters
Modbus
KM-BUS
"Fault code"
Message codes for connection faults
00:
Connection status
"OK"
is set.
> 00: Connection faults: If the fault occurs repeatedly, the connection status
is set to
"Fault"
.
"Timeout counter"
Number of failed attempts to connect to the subscriber: If the internal limit is
exceeded, the fault message
"EE KM-BUS subscriber"
or
"EF Modbus
subscriber"
appears (see "Messages").
Service PIN
To identify the integral LON communication module,
the heat pump control unit sends a message to
all
other LON subscribers.
Note
Only required with "tool binding", i.e. if the heat pump
control unit is integrated into a LON with devices from
other manufacturers, e.g. BMS system.
Viessmann LON manual
1. Service menu:
Press and hold
OK
+
å
simultaneously for
approx. 4 s.
2. "Service functions"
3. "Service PIN"
The message is being sent. No operation is possi-
ble for approx. 4 s.
Function check
1. Service menu:
Press
OK
+
å
simultaneously and hold for
approx. 4 s.
2. "Service functions"
3. "Function check"
4.
Start the required function, e.g.
"Heat pump"
.
Only those functions are shown that correspond to
the actual system equipment level.
During the function check, the system overview is
displayed: See "System overview".
5.
Terminate function with .
Function
System characteristics
"Heat pump"
■
Heat pump is switched on and regulated to a return temperature of
30 °C.
■
Outputs for primary and secondary pumps are switched. Primary and
secondary pump are not connected.
"Primary source"
Note
This function takes 10 min.
■
Output for primary pump is being switched. Primary pump is not con-
nected.
■
An average value for the primary circuit flow temperature is calcula-
ted every minute.
Saving/loading settings
After a few minutes, the heat pump control unit auto-
matically saves changed parameter settings on the
coding card .
With
"Save settings"
, the saving process can be car-
ried out manually at any time, e.g. if the coding card is
subsequently removed.
With
"Load settings"
, parameter settings from the
coding card can be loaded on to the control unit. This
way, several devices can for example be set up identi-
cally one after the other via a coding card.
Service functions
Subscribers (Modbus/KM-BUS)
(cont.)
5800 917 GB
Parameter