Cylinder Timer, if you are heating a hot water cylinderTo avoid the cylinder heating being switched off accidentally we normally add 2 on timers a day, oneat 3-00 am and one at 15-00 pm. This stops nuisance tripping, resets the unit after power cuts andinsures the cylinder is hot 24 hours a day. We don’t normally set any off times.To set the cylinder up as above:1. From the front screen press the gear button, scroll right > to schedule, press ok.2. If any timers are showing highlight them and select delete. When no timers are shown we canadd some new ones.3. Highlight + add schedule, press ok4. Highlight daily schedule, press ok5. Type - quiet will show, press v to DHW, do not use quiet6. Press > press ^ to set to Standard, press >, adjust hour to 3, am press ok7. Scroll up ^ to + add a timer8. Highlight + add schedule, press ok9. Highlight daily schedule, press ok10. Type quiet will show, press v to DHW, do not use quiet11. Press > press ^ to set to Standard, press >, adjust hour to 3, pm press okHeating & Hot Water InstallationField settings for Hot Water11. Then v to 30** DHW, press ok, 3011 will be highlit Domestic hot water tank , press OK12. Press v, to hysteresis thermo off, press ok13. Go to 302* heat pump, press ok, press v 5 times to 3025 Max DHW operating time, press ok14. Use ^ and v to set to 60 mins for 200 litre or 90 mins for 300 Litre cylinders, press ok15. Press v to 303* booster heater, press ok.16. Press v to 3032 delay time, press ok, use ^ and v to set to 30 mins, press ok then return17. Press v to 304* disinfection, press ok18. Press v to 3042 interval, press ok, press ^ or v to get to Tue, press ok19. Press v to 3043 start time, press ok, use ^ and v to set to 3am, press ok.20. Press v to 3044 target temp, press ok, use ^ and v to set to 60°C, press ok21. Press v to 3045 duration, press ok, use ^ and v to set to 10 mins, press ok.22. Press return nine times to return to the normal screenThe cylinder maintains the tank within 5°C of set point. It heats the cylinder for the max time adjusted in line 14. To begin with it uses justthe heat pump, but after the time set in line 16 the immersion comes in to help.