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2-2-8.1 Protecting your system
To protect your heating system and avoid all risks of it freezing in case it is intentionally or accidentally
turned off, we strongly advise that you:
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Either drain the water circuit by disconnecting the unit inlet and outlet),
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Or take the following precautions:
Protect your indoor water circuit with a mix of water, antifreeze and corrosion
inhibitor (and, possibly, a biocide). Using a corrosion inhibitor will
also prevent the formation of sludge caused primarily by corrosion.
You may use refrigerants made with monopropylene glycol or a natural compound containing one or more corro-
sion inhibitors (never use monopropylene glycol by itself; always mix it with corrosion inhibitors).
)
Do not use products made with monoethylene glycol, which is toxic.
You may use:
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ready-to-use solutions
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dilutable products
If you use a concentrated dilutable solution, following the instructions below:
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Always dilute the antifreeze with water before adding it to the system. Never add them separately.
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Always mix the correct amounts of water, antifreeze and corrosion inhibitor in a container before adding them
to the system.
2-2-8.2 Procedure
1- Rinse and drain the system
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Always flush the system completely and blow it out to remove any remaining water.
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Washing the system with a suitable cleaner is recommended (the type of cleaner depends on the system’s
materials).
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Follow up the final rinse with a complete drain of the system.
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If you have a radiant floor heating system, only use pressurised neutral gas
(compressed air, nitrogen) to blow out the water remaining in the water loops.
2- Add the water, antifreeze, corrosion inhibitor and pressurise with the hydraulic pump
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Drain the system thoroughly.
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Allow the mixture to run through the entire system for at least 2 hours before starting the heat pump.
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Use a hydrometer or a refractometer to check the final proportion obtained.
3- Using litmus paper or a pH meter, check the pH obtained
.
4- Affix, in a visible location, a label stating
:
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that the system contains antifreeze,
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the name of the product and its supplier,
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the proportion and the pH at commissioning.
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Always top up with the same type of mix initially used.
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Annual maintenance: check the proportion and the pH.
2-2-8 Frost protection
(for the account of installer)
Base outdoor
temperature (*)
MPG content
to be used
Freezing
temperature
Setting P1
adjustment
Setting P93
adjustment
-5°C
20%
-8°C
1
0
-10°C
30%
-15°C
1
-5
-15°C
40%
-25°C
1
-10
2-2-8.3 Adjusting settings P1 and P93 based on the glycol content
Table of correspondences among the: base outdoor temperature for the system location
Monopropylene glycol (MPG) content
adjustment values for settings P1 and P93
*
Base outdoor temperature: minimum daily temperature recorded at least five times over the course of the year.
If your Aqualis 2 system is located in an area subjected to below-freezing
temperatures, you must add glycol to the water in it.
