Carnation Construction
Contact Dave

Sewage - Pump Timer

You need an "Off period timer" that activated an "On period timer".

The "off period timer" will apply power to the an "on period timer" once per hour (or whatever it is set to) and the "On period timer" will then turn on power to the pump for a specified time such as 30 seconds (finely adjustable).  To ensure good reliability use a 40 amp external contactor relay on the output of the "On period timer" timer.

Inkbird Digital Twin Timer Relay Time Delay Relay Switch 110-220V Black IDT-E2RH

Digital Timer

http://www.amazon.com/gp/product/B008KV65MS?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00      $26.49

Digital Timer

Digital Timer 

Digital Timer 

Digital Timer 



Because the timer module is not rated for enough current for the pump, you need an external relay module.

Relay Contactor 115V 40A 

http://www.amazon.com/Packard-C240B-Contactor-Pole-Voltage/dp/B004Z0RLL2/ref=cm_cr_pr_sims_t/185-8639751-5649867    $11.27


For maintenance and testing it is worth adding an override switch to allow the pump to be turned on continuously.  Also a switch to turn power off so that the pump cannot operate.  A 3 position switch is best.

Switch Toggle 3 Way Center Off 

https://www.amazon.com/Baomain-Toggle-position-mounting-terminal/dp/B01MYXGGX5/ref=sr_1_5?dchild=1&keywords=3+position+toggle+switch&qid=1603922639&sr=8-5         $5