Can I program this timer to turn a hot water circulating pump, 4 times a day for say 15 minutes, 7 days a week? Also, can I install a bypass switch to override the timer? Can you provide wiring instructions for a 3-way switch. Thanks

Chris, Yes, you can program the Utilitech Timer Model 78436 to turn your hot water circulating pump on and off four times a day for 15 minutes each time, seven days a week. This timer supports up to seven ON/OFF schedules per day, which should meet your needs. As for installing a bypass switch to override the timer, it is possible. You would need to wire the bypass switch in parallel with the timer. This setup allows you to manually control the pump regardless of the timer's settings. However, it's important to ensure that the wiring is done correctly and safely. If you're not comfortable with electrical work, it might be best to consult a professional electrician. The wiring diagram is in PDF and I cannot share PDFs on this page.