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20 mins. Second pressure measurement
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30 mins. Third and final pressure measurement
The ground array has passed the test if the pressure difference (pressure drop) between (6)C and (6)A
does not exceed 0.1 bar.
The test should not be conducted in cold weather, when there is a risk of freezing.
5.1.5 Testing of antifreeze concentration
It is important that the concentration of the antifreeze within the ground arrays should be a minimum of
22% or a protection level of –10
alarm and the heat pump to cease operation during severe prolonged cold weather.
The antifreeze concentration should be tested with a refractometer. If required a sample can be sent to
Kensa for testing.
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
valve as shown in Fig 15.
Plant Room Heat Pump Manual Version 11.1
Page 22 of 34
B
C
Fig 14 Graphical Test Procedure
o
C (Refractive index 1.356). Concentrations below this could cause an A1
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