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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:
zEither drain the water circuit by disconnecting the unit inlet and outlet),
zOr 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:
zready-to-use solutions
zdilutable products
If you use a concentrated dilutable solution, following the instructions below:
zAlways dilute the antifreeze with water before adding it to the system. Never add them separately.
zAlways 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
zAlways flush the system completely and blow it out to remove any remaining water.
zWashing the system with a suitable cleaner is recommended (the type of cleaner depends on the system’s
materials).
zFollow up the final rinse with a complete drain of the system.
LIf 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
zDrain the system thoroughly.
zAllow the mixture to run through the entire system for at least 2 hours before starting the heat pump.
zUse 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:
zthat the system contains antifreeze,
zthe name of the product and its supplier,
zthe proportion and the pH at commissioning.
LAlways top up with the same type of mix initially used.
LAnnual 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.
