The Ultra-Fuels Model JDI-VII is a heat pump control designed for any heat pump application, which includes total electric and dual-fuel, single-stage applications. According to the manufacturer, it performs the same job as a typical heat pump thermostat. The control uses only four wires, RWYC, to a single-stage heat-cool thermostat. Emergency or auxiliary heat is selected by clicking the fan switch to on and back to auto twice. The sequence of operation does not allow second-stage heat to come on unless the homeowner decides to turn it on, thereby taking advantage of the heat pump and its economy, says the company.
BP Porter Inc., 6200 NE 107th St., Oklahoma City, OK 73151; 405-771-3323; 405-771-2292 (fax); email@example.com