Other Settings; Important Points To Check After Commissioning - Worcester GREENSOURCE 6 kW Installation Manual

Commissioning
Display
The function affects the window contrast and brightness. On delivery the max
setting 10 is set on both.
Alarm during start up
During start up there may be an alarm regarding Low temperature in condenser.
The cause is that the fi lled water is too cold (colder than +5ºC).
Check the sight glass inside the heat pump. Bubbles may appear in the sight
glass for a few minutes during start up. The bubbles should then stop. If it
bubbles continuously this is a fault symptom which is probably due to insuf-
Sight glass
fi cient refrigerant.
Flow

Other settings

Go through the heating and hot water settings in the Menu and Advanced
menu and make the necessary adaptations. For example the temperature
settings for underfl oor heating must be lower than the factory settings. Set
appropriate V and H values.
In the event of too low outdoor temperature, the compressor in the heat
pump is switched off and all heating and hot water heating is via the
electric element in HWDU. The fl ow temperature will now be based on the
hot water temperature (sensor T3).
If the H value is set so that it is higher than 55ºC the max temperature for
T3 must be checked and changed.
Outdoor temperature
To permit higher fl ow temperatures go to Advanced menu on I/S-level.
Select Additional heat settings.
Then select Electric additional heat settings and T3 Stop temperature.
Factory setting is 62ºC. You can change this to max 70°C.
NOTE! At settings above 65ºC a mixing valve must be installed. The
Factory settings table lists all functions, which can be changed by the
customer and installer. Go through the list to see if any other settings need
to be changed.

Important points to check after commissioning

For the installation to perform at its best, it is important to check the fl ow on the hot side of the heat pump. Usually, the heat
carrier pump has a speed selector switch. This must be set correctly for the pressure drop in the system. A recommended
temperature difference across the heat pump on the hot side is between 5-10ºC. The nominal fl ows provided inTechnical
information shows a difference of 7ºC in operating mode +7/45ºC. Check this by reading the sensors T9 (heat transfer fl uid
in) and T8 (heat transfer fl uid out).
When commissioning is carried out at a low outdoor temperature (below 0ºC) the temperature difference should be
between 5ºC and 7ºC.
When commissioning is carried out at an outdoor temperature above 15ºC the temperature difference must be between 8ºC
and 10ºC.
The fl ow through the heating system should be suffi cient to keep the whole radiator warm and thereby increase the heat
emitting surface. This means that the fl ow temperature is kept low.
After testing, vent the heating system again and top up with cold water if necessary. See Filling the heating system.
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