Senne, Typically the way this would be accomplished is to connect the flow from Type60's outlet to the active layer fluid inlet temperature and mass flow rate via a pump and to turn the pump on and off based on the control signal of a thermostat that watches the zone temperature (Type108 would be a good choice for the thermostat model). The tank would then be kept warm separately by some kind of heater. Type60 has a thermostat and heater built into it if you want to use an electric or gas element. Take a look at parameters 15 through 29. If you are heating the tank by external means (a solar collector, a heat pump, etc.) then Type2 is probably the correct choice but it should look at the tank bottom temperature and the outlet temperature of the heating device. Kind regards, David senne plessers wrote: Dear all, -- *********************************************************************** Thermal Energy System Specialists (TESS), LLC David BRADLEY 22 N. Carroll Street - Suite 370 Partner Madison, WI 53703 USA P: +1.608.274.2577 F: +1.608.278.1475 E-mail: bradley@tess-inc.com Web Pages: http://www.tess-inc.com and http://www.trnsys.com *********************************************************************** |