ASSE International has published a new Listing Evaluation Criteria document — ASSE LEC 2010-2020, Proportional Flow Control Devices, with Protection from Cross Contamination via Hydronic Water, for Use in Drinking Water Installations.
ASSE LEC 2010 devices control the flow of potable water based on the pressure of hydronic water from a hydronic system. The device performs this hydraulically and has integral cross-contamination protection between the potable and hydronic water. Proportional flow-control devices are typically installed in conjunction with a heat exchanger and a part of a hydronic system loop.
Typically, these products are installed as part of an integrated system to balance flow into both sides of a double-wall heat exchanger — one side increases the cold water supply temperature to supply domestic hot water, and the other side receives hydronic hot water cooled to supply the hydronic loop. The device controls the flow of water of both the cold water supply and the hydronic loop based on the temperature and flow requirements of the hydronic loop. This helps minimize dead legs in the hot water distribution system to supply fittings.
For more information, visit asse-plumbing.org.