Baxi Geoflo, Operation, Installation & Maintenance Instructions, Page: 22 / 24

22
© Baxi Heating UK Ltd 2006
Installation Instructions (cont)
15. After water has circulated for approximately ten minutes, and no more debris has collected in the sieve, the valves on the first slinky ® can be closed and the
valves opened on the other slinky ® , again being careful that the return pipe into the container does not whip round and cause any injury. At this stage, the valve
to the heat pump should still be closed.
16. After another ten minutes, once no more debris has collected in the sieve, go on to any other slinkies ® in turn. When all the slinkies ® have been purged, the
valve to the heat pump can be opened, which will purge the heat pump of air - this is likely to occur very quickly, and great care should be taken that the hose
discharging into the container does not whip around.
17. Repeat the above procedure, placing the return hose from the slinky ® manifold under water in the container until that there are no more bubbles of any
kind.
18. Once you are certain that you have circulated water around all the slinkies ® , and there is no more air left in the entire ground array system or the heat
pump, pour antifreeze into the container (it may be necessary to remove some water first) and repeat the procedure, to ensure that all the antifreeze has mixed
thoroughly through to all the slinkies ® and to the heat pump.
19. Close the fill and purge valves on the slinky ® manifold with the pump running, shutting the return valve last so that the slinky ® is left under pressure.
20. The system should remain pressurised at above 1 bar and can be checked for leaks; the pressure will slowly fall as the pipes in the ground arrays slowly
expand in the coming months, and may need topping up using the cold fill system provided. Most purge pumps will usually attain around 5 bar, and it is quite
acceptable to leave the circuit at this pressure, so that any leaks will immediately become apparent.
21. In order to activate the software controller, both the ground and underfloor circuits must be taken above 1.8 bar water pressure.
22. Remove the purging equipment, and the handles from the valves on the manifold to ensure they cannot be inadvertently operated, and place the plastic
blanking plugs back in the slinky ® manifold.
23. Find the cold fill for the underfloor heating system and open the valve to allow water into the underfloor system and the Compact.
24. Remove the cap from the Output Pump Bleed Port and depress the schrader valve using a small screwdriver, as shown in the "Output pump bleed port"
illustration. Alternatively, the schrader valve core can be unscrewed completely using a car tyre valve core remover and a 10 mm internal diameter plastic pipe
placed on the outside of the valve to allow any water or air to be vented into a bucket.
25. When a solid stream of water comes from the valve the pump will be bled. This procedure needs to be repeated at intervals during the commissioning
procedure if there is any air in the underfloor system, which is highly likely. Place the cap back on the Output Bleed Valve .
26. Turn the power on to the heat pump. The display will read the temperature of the water returning from the underfloor / radiators. If error t1 is displayed,
then the heat pump will not run until both underfloor/radiator and ground circuits are at about 2 bar pressure.
27. Enable the heat pump, and make sure the impellors in both ground and underfloor/radiator water pumps are turning by removing the stainless steel screws
in the centre of each water pump and inserting a flat-bladed screwdriver.
28. Please call Baxi so that the Commissioning Sheet can be completed.
29. Replace the three closure panels by screwing in the 5 mm hex key screws on the front of the Compact. Carefully lift the hood back onto the Compact,
which may require two people. Screw in the 5 mm hex key screws on either side of the base of the hood. Replace the door and lock it shut.