SR981S/SR982S operation manual of solar pump stationPage 67 of 85condition earlier than the second priority tank, then the first priority tank will be heated untilits maximum temperature reaches, afterwards, the second priority tank just can be heated.If the temperature difference of the second priority tank reaches to its switch-on conditionearlier than the first priority tank, then the second priority tank can be heated, but, whenthe switch-on condition of the first priority tank reaches, then controller stops to heat thesecond priority tank, and it switches to heat the first priority tank. To ensure to heat the firstpriority tank, its switch-on temperature difference is monitored at any moment while thesecond priority tank is heating. The measuring and judging is checked every 15 minutes.As factory set, the measuring is done every 15 minutes, and measuring lasts 2 minutesevery time. These 2 parameters are possible to be changed.Tank priority function is used in the system with 2 tanks or tank is heated in layer along thebody of tank. by priority selection thermal energy can be divided into 2 tanks. Thiscontroller has several different priority logics:1. Tank priority logic ( 01 and 02)2. Continuance heating ( Su1 and Su2)3. Parallel heating ( 0)Select PRIO menu, “PRIO” displays on the screen.►Press “SET” button to enter submenu, “PRIO 01”displays on the screen►Press “SET” button again, “01” blinks on the screen►Press “ ” button, to adjust tank priority,adjustable range: 01 ~ 02, Su1, Su2, factory set: 01►Press “ESC” button to exit the menu or wait for 20 seconds to exit, parameters aresaved automatically.8.5.11.1 tRUN Intermission heating run-on timeDescription：Controller monitors the temperature difference between collector and tank and compareswhether it meets the switch-on condition. If the switch-on condition of the first priority tankis not met, then controller checks the switch-on condition of the second priority tank, if its
