12
VMIFB202
The circulation pump’s integrated alarm has deployed
Action:
Check if there is air in the heat transfer uid circuit that can gather in the circulation pump
Bleed the radiator circuit according to the installation instructions.
Check if the circulation pump has jammed.
If the circulation pump has jammed, there is an integrated shake function that attempts to shake itself loose up to a maximum of 5
times, if it does not succeed, an alarm will occur.
Try cutting the voltage to the heat pump to stop the alarm and then manually run the circulation pump.
If the alarm recurs, repeat the procedure several times.
Check the circulation pump’s 0-10V signal
Measure the 0-10V signal between terminals 329 and 330.
Go into the service menu and run the circulation pump in manual mode 30%=3V 40%=4V 50%=5V etc.
If the correct control signal is obtained there is a relay card fault.
If the correct control signal is not obtained from the control board the control board must be replaced.
If one obtains 0-10V in all operating modes and the alarm remains the internal alarm circuit in the circulation pump has probably
broken or there is a broken cable.
One can then bridge the alarm signal between 327 and 328 to remove the circulation pump’s internal alarm protection. The internal
alarm function will then be completely absent.
Replace the circulation pump if the heat transfer uid circuit has been fully bled and the relay card measured so that it transmits the
correct signals but the alarm remains.
Troubleshooting Guide Alarm circulation pump
To Next Page
Loading...
Need help?
General