Dimplex A8M Installation Manual page 35

Figure 22: Compressor test
If there is no flow at all, a high pressure fault will appear on the UI screen and the commissioning will be
aborted. Once the test is completed, you will see one of three messages:
1. No flow detected
2. Flow too low
3. Flow detected
If you see message 1 or 2, this might be an indication of an air-lock, dirty strainer, flow restriction or pump
too small for the required pipework. Please check for these issues and if present, rectify to ensure that
there is sufficient flow then repeat the test. There will be a time delay before you can restart the test.
When you seea screen with the pump highlighted in green, flow has been detected and the compressor
'flow check' test is complete. You will receive the status 'Waterside is OK' when the waterside checks are
completed. Selecting Next brings you to the Electrical Connections menu.
Figure 23: Good flow detected and water side OK confirmation screens
If carrying out start up in cold weather, commission the heat pump heating only the buffer. Once it reaches
the required temperature open each zone slowly and in series, especially for under floor heating. If you
have selected Schematic 1 or 3 (Space heating only or Bivalent space heating), move now to section
4.4.12 Heating Curves to complete the commissioning process.
Millbrook House, Grange Drive, Hedge End, Southampton, SO30 2DF
Once this is successful, the compressor will run for 5 minutes. As the test runs,
the screen will give you information on the status of the heat pump and the time
remaining on the test.
If you do not have flow or if there is a problem, you can stop the test. If you
stop the test, there is a 5 minute delay before you can attempt to run the test
again. It is not possible to bypass the test, as good water flow is critical to the
operation of the heat pump.
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