7
ENVISION RESIDENTIAL INSTALLATION MANUAL
Water Quality
In ground water situations where scaling could be heavy or where biological growth such as iron bacteria will be pres-
ent, a closed loop system is recommended. The heat exchanger coils in ground water systems may, over a period of time,
loseheatexchangecapabilitiesduetoabuildupofmineraldepositsinside.Thesecanbecleaned,butonlybyaqualied
service mechanic, as special solutions and pumping equipment are required. Desuperheater coils can likewise become
scaled and possibly plugged. In areas with extremely hard water, the owner should be informed that the heat exchanger
mayrequireoccasionalushing.
Units with cupronickel heat exchangers are recommended for open loop applications due to the increased resistance to
build-up and corrosion, along with reduced wear caused by acid cleaning.
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