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the boiler supplies hot water to heating coils in air handler units, flow control valves or other devices must
be installed to prevent gravity circulation of boiler water in the coils during the cooling cycle. Chilled water
medium must be piped in parallel with the boiler.
Freeze protection for new or existing systems must use glycol specifically formulated for this purpose.
This glycol must include inhibitors that will prevent it from attacking metallic system components. Make
certain that the system fluid is checked for the correct 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. Example: 50% by
volume glycol solution expands 4.8% in volume for the temperature increase from 32
o
F to 180
o
F, while
water expands 3% over the same temperature rise.
Never use dielectric unions or galvanized steel fittings when connecting to a stainless steel storage tank
or boiler. Failure to follow this instruction can lead to premature failure of the boiler system. Such failures
ARE NOT covered by warranty.
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