Technical data

vi. When all the air has been removed reduce the level of water in the bin to 200-250mm by removing

fresh water from the system (via the pump discharge pipe). Do not uncover the suction pipe. Add 1

drum of antifreeze to dustbin and using pump circulate around heat pump.

vii.

Move the valves to the position below

viii Add 1 drum of antifreeze to the dustbin

ix. Start purge pump

x. When the return pipe to the dustbin runs with clean water (after a few seconds) discharge this wa-

ter to waste until the level in the dustbin is approx 200-250mm. Do not uncover the suction pipe.

xi. Place the return pipe back into the bin.

xii. Purge for 5 to 10 mins to ensure that the antifreeze is mixed.

xiii. With the purge pump running move the return valve to the position below to close off the return

purge connection and pressurize the heat pump using the purge pump.

xiv. With the purge pump still running move the flow valve back to the normal run position.

There should be approximately 200-250mm of water/antifreeze mix within the dustbin which can be

poured back into an empty drum and disposed off according to the disposal instructions in section 8 or

retained for topping up the system.

To mix the antifreeze around the ground arrays thoroughly, it is advised that the ground array circulation

pump is turned on via the 4 amp MCB on the heat pump. (Note DO NOT TURN THE COMPRESSOR 25 amp

MCB ON). This ground array circulation pump should be left running for two to three hours to ensure the

antifreeze is mixed in all the slinkies and the heat pump. (Note: - the floor pump will also run)

The slinky is now fully purged with the antifreeze added.

Both purge connections are now open to slinky.

One purge connection is closed the other open.

Both purge connections are now closed.

5.1 .4 Testing of Antifreeze Concentration

It is important that the concentration of the antifreeze within the ground arrays should be a minimum of

20% or a protection level of –10

C Concentrations below this could cause an A1 alarm and the heat pump

to cease operation during severe prolonged cold weather.

The antifreeze concentration should be tested with a refractometer .

The concentration of antifreeze is required for the commissioning certificate and it is advised that this

figure is noted in the settings table. A sample of the fluid can be obtained from the ground side Schrader

Flow Return