can I use pressure regulators after the timer or must the pressure be reduced first?

Thank you for contacting Melnor. The timer has a minimum requirement of 20 psi and maximum of 80 psi to operate the valves properly. You can put the pressure reducer on before or after as long as those parameters are still met.

My tap has 50 psi and delivers 15gph, I want to run 5 sprinkler heads/zone at about 7.5 gph/zone. Will this system work for this set up?

Are you asking whether you can run 5 x 7.5 gph x 4 zones at the same time? If so, no. That is 150 gph. But, per zone at 5 x 7.5 gph. Yes. That is 37.5 gph.

When it eventualy fails...will it fail in the closed position. so it doesnt allow the water to just run and run.

It failed in closed position for me when the battery got to low for normal operation. Also it was running at the time, battery was low, so it shut the valve down and just displayed the low battery error.

does the 4 zone timer be programmed to be on day of the week, for example, zone 1 on monday, 2 for tuesday etc?

Thank you for contacting Melnor. Each zone on the Melnor 53280 is completely independent of each other so you can program each zone for a different day of the week.

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🌿 Watering Made Effortless!

CLEAR VISIBILITY - Large LCD screen ensures you never miss a watering schedule.
DURABLE CONSTRUCTION - Built with a zinc connection nut for long-lasting performance.
USER FRIENDLY DESIGN - Rubberized multi-function control for easy operation.
EFFORTLESS SCHEDULING - Water your garden up to 24 times a day, tailored to your needs!
CUSTOMIZABLE PROGRAMMING - Set watering days individually for maximum flexibility.

The Melnor Hydrologic 4-Zone Digital Water Timer is a state-of-the-art irrigation solution designed for the modern gardener. With its durable zinc alloy construction and user-friendly interface, it allows for precise scheduling of up to 24 watering sessions per day, tailored to individual days of the week. The large LCD screen provides clear visibility of settings, making it an essential tool for maintaining a lush garden effortlessly.

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Product Dimensions	7.8 x 20.09 x 18.29 cm; 579.69 g
Part number	53280
Material type	Zinc Alloy
Power source type	Battery Powered
Manufacturer	Melnor
Item model number	53280
ASIN	B01E0LONN4

MelnorHydrologic 4-Zone Digital Water Timer

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