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Common Troubleshooting Issues
The Boiler Outlet temperature displayed at the
ModSync does not match what is shown on the local
boiler controls for 4-20mA applications.
This is commonly seen on boilers with the Siemens
LMV3 controls. Check that the Outlet temperature
scaling in the ModSync matches the scaling in the local
boiler controls. The most common are 0-210F and 0-
240F.
The Protonode is not communicating with the ModSync
(Rx and Tx are not flashing)
Check that the Protonode is connected to port 2 on the
ModSync using the factory supplied cable. The Port 2
settings on the BMS Config page should be set up for a
node address of 2 and baud rate of 19200. Press the
reset ModSync button to refresh the port and load the
settings.
The Boiler is tripping on its high limit while under
ModSync control.
Check that the Maximum setpoint plus any deviation is
set at least 10F below the high limit of the boilers.
Check flow through the boilers including isolation valve
and pump operation.
ModSync displays *** for temperatures instead of a
value.
The ModSync sensor reading is out of range. Check
wiring and sensor operation.
Boilers will not Start/Stop while under ModSync
control.
Check the limit string at the boiler, Wiring and/or
Modbus communication, ModSync settings or settings
at the local boiler control. If the ModSync shows a call
for heat but the boilers to not fire a Monitor Alarm
could be seen at the ModSync.
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