Solar Control

Mike Dunn

A very basic digital differential controller

Eagle 2 is under $200.00

http://www.imcinstruments.com/

Plumber5209

Solar Control

I have a customer with a 1980s solar hot water heating system. The control that runs the circulator is no good and I am having trouble finding a replacemant. It is a Robert Shaw Solar Comander. I called Robert Shaw and the only person that new anything about it said it was only a prodotype and he never new that they sold it. All I need the control to do is when the tank calls for heat to also read the temp on the pannel to see if there is any avalible and either run or not run the circulator. Any ideas would be helpfull thank you Derek

mark schofield

goldline gl30

http://kingsolar.com/catalog/mfg/goldline/gl30.html

[Deleted User]

Tekmar....

Differential controler. model 155.

ME

Andrew Hagen_2

Caleffi

Caleffi iSolar1 Control

As far as I know, the Goldline control is no longer available?

SPB

Honeywell

I've used both the Tekmar as well as the Gold line and there are some others also. I stumbled on to a Honeywell T775.. The relays are self powered so you don't have to have a transormer plus it was less than $200.00. It was kind of a do all control, (they have different models and maybe a good control sales person can help match exactly.)

Metro Man

depends

Depends what type of system you have. You now have the opportunity to install something that is tailored to they're system. Is it a glycol, drain-back, drain-down or ????

There are a plethora of controls on the market now and some that are the old reliables and have stood the test of time. Expect to pay more for digital.

I would stay away from controls that do not have a proven track record.

That said... Steca, Goldline, Resol, etc... are all good. Tekmar seems to be the most accurate but they need 24 vac to power up. Wish they would come out with a 110 vac replacement that is cost competitive......

Metro Man

michael_34

Solar controller

Been using Resol Delta Sol BS plus
Really easy to use and great display

hot_rod

Caleffi i-Solar

have some features that are unique to them that Resol has provided. The V-bus connection for data logging is standard and two models offer variable speed pump control.

Caleffi i-SolarSolar 3 and Solar Plus have two relays which can be used for managing other loads.

Here is an example of a system that could use two differential controls very well. One to run the solar input, the second to control a 3 way zone valve to shuffle the load from solar to back up. Both functions could be handled, managed and data logged from one control.

I thought Goldline was bought out several years ago and the new company discontinued production? Has that changed? Or are those old inventory Goldline controls?

hr

Metro Man

goldline

Nope.... Goldline is still at it. They are owned by Hayward but are still making they're controls. Probably one of the most bombproof, easiest to wire controller out there.

Also one of the easiest for a homeowner to understand.

Wish they came with a digital option though.

Metro Man