Aqua-Hot 675-D, Инструкция по использованию и уходу

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Section #: Title
16
©Aqua-Hot® 600D and 675D Use and Care Guide
Appendices
the antifreeze in the solution will continue to combat the nor-
mal expansion of the solution as it freezes. The point in which
the solution can begin to expand due to colder temperatures
is called the “burst point.” Once the solution reaches the burst
point, the potential is present for ruptured pipes to exist. The
burst point of the antifreeze and water solution is dependent
upon the brand of propylene glycol antifreeze employed.
Boiling Point
The Aqua-Hot utilizes the propylene glycol based
(PPG) antifreeze and water heating solution as a transporta-
tion means for the heat produced from the internal processes.
The PPG antifreeze solution absorbs the heat created until its
boiling point is reached. It is at this point when the liquid turns
to a gas and is expelled to prevent the heating system from
overheating. Each time the boiling point is reached, a loss of
efficiency occurs because the heat produced is expelled rather
than utilized for the function of the heating system. Therefore,
a higher boiling point is desired in order to combat the loss of
efficiency, which allows the antifreeze to transport the heat
created from the internal process throughout the motorhome
where it can be utilized productively rather than dissipating
due to its change from a liquid to a gas.
Rust and Anti-Corrosive Inhibitors
Another major function of the antifreeze solution is to
protect the internal metal components of the Aqua-Hot system
from corrosion and rust. Antifreeze is able to perform this
function by the addition of rust and corrosion
inhibitors, which are designed specifically
to activate in a water solution.
Summary
Antifreeze solution has three basic functions
1. Freeze Protection
2. Boil-over Protection
3. Anticorrosion and Rust Protection
PPG antifreeze solution is also primarily responsible
for heat transfer; however, propylene glycol itself does not
possess acceptable heat transfer characteristics. Therefore,
water is added to the mixture due to its nature as an excellent
heat conductor. PPG antifreeze solution, mixed with water that
is 35% to 50% propylene glycol is recommended to provide
the best performance combination of the aforementioned
functions. If excess propylene glycol exists within the anti-
freeze and water heating solution, the water’s heat absorption
properties will be compromised. This could ultimately inhibit
the Aqua-Hot from providing adequate domestic hot water and
interior heating.
Additionally if the antifreeze and water heating solu-
tion contains over 70% propylene glycol, the freezing point is
raised, resulting in less freeze protection. Please reference the
attached graphical representation regarding percentage of
antifreeze to water and how it directly affects the solution’s
freezing point.
Burst Point
Freeze Point
Propylene Glycol Based Antifreeze Protection