Shoebox Heat Pump Manual Version 9.4
Page 31 of 40
6. Mechanical Set to Run
After all mechanical and electrical work has been completed, the following commissioning instructions
should be followed.
6.1 Purging the ground array of air.
It is important for correct operation that all the air is removed from the ground arrays and heat pump.
Deaerators should be fitted at all high points of the system to ensure that any air within the pipe is
removed.
A pressurisation and expansion set should also be fitted onto the ground array to ensure that the fluid
content and pressure is maintained within the system.
Once all the air has been removed the commissioning process can continue.
6.1.2 Testing of Antifreeze Concentration
It is important that the concentration of the antifreeze within the ground arrays should be a minimum of a
protection level of –
10
o
C (minimum 22% by volume, Refractive Index 1.356). 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. To comply with MCS guidelines two random samples of anti
-
freeze
concentration should be taken when the ground array is commissioned.
6.1.4 Reassembling the Heat Pump
i.
Ensure all tools and materials are removed from the inside of the unit.
ii.
Reposition the front panel
iii.
Using the 2 x 5mm cross headed screws secure the front cover in place.
iv.
Replace the top of the unit.
6.1.3 Heating distribution and load side purging
i.
Find the cold fill for the heating system and open the valve on the heating system to allow water
into the heating system and the Shoebox.
ii.
Ensure a load side water pump is fitted and operational.
iii.
Follow the manufacturer
’
s procedures for purging the heating system.
We recommend a central heating inhibitor is added to the heating water in the heating distribution circuit.
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