Freeze Protection - Watts Aerco AM Series Operation & Maintenance Manual

AM Series Pool Heater User Manual
SECTION 5: INSTALLATION – PIPING

5.4 Freeze Protection

Freeze protection for new or existing systems must use glycol that is specially formulated for this
purpose. This includes inhibitors, which prevent the glycol from attacking the metallic system
components. Make certain to check that the system fluid is correct for the glycol concentration
and inhibitor level. The system should be tested at least once a year and as recommended by the
producer of the glycol solution. Allowance should be made for the expansion of the glycol solution
in the system piping. Use only inhibited propylene glycol solutions. Ethylene glycol is toxic and
can corrode gaskets and seals.
WARNING!
Never use non-approved additives or toxic boiler treatment chemicals in the heating system.
Any additives introduced into the heating system must be recognized as safe. Use only
inhibited propylene glycol solutions, which are specifically formulated for hydronic systems.
Ethylene glycol is toxic and can attack gaskets and seals used in hydronic systems.
CAUTION!
It is up to the installer to ensure that the minimum system flow is met, otherwise the flow
sensors will automatically stop the burner.
WARNING!
The National Standard Plumbing Code, the National Plumbing Code of Canada and the
Uniform Plumbing Code limit the pressure of the heat transfer fluid to less than the minimum
working pressure of the potable water system up to 30 psi maximum. Also, the heat transfer
fluid must be water or other non-toxic fluid having a toxicity of Class 1, as listed in Clinical
Toxicology of Commercial Products, 5th Edition.
OMM-0111_B: • GF-146-P • 10/29/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 25 of 47