I STILL have a working Grumman Sunstream water heater and it's running 24/7 since I replaced the 80 gallon water heater.

[lynnieart]

I purchased a C-30 controller - it's coming in the mail. The plumber who installed the new water heater did a perfect job of installing to the console, but something changed, the console is on all the time, trying to collect. I'm very concerned as it's been 2 weeks and all the troubleshooting is getting me no where. Thankful for a contact with someone who can help. I AM ON KAUAI a little Hawaiian island. so it's slim pickings. Thanks Lynne

 

[Delta Prime]

Welina mai iā Maker Pro!
Is this what you are waiting for?
C-30 temperature
differential controller.


I know you're probably looking for someone who has one and who can help you out I know the principles behind it but there's so much information you left out that I'm trying to piece it together.
I hope this will help.

Grumman sunstream control unit

Have an old Grumman Sunstream control unit, previous owner said the heat exchanger was calcified.

forum.heatinghelp.com

If you do not have the original owner's manual and if it is a CF 100 then
you have to join this site in order to download the PDF document your going to have to give a credit card I think it's a free trial I'm not a member so cannot recommend it. But the site is legitimate.

Grummam Sunstream CF100 Counterflow Module Manual | PDF | Pipe (Fluid Conveyance) | Water Heating

Grummam Sunstream CF100 Counterflow Module Solar

www.scribd.com

If you could perhaps make a block diagram of your specific setup; solar panel battery, Maximum power point tracking (MPPT) etc. then I would be happy to assist you.