KEWANEE Boiler Relay

Well, it would be easier to guess if we could see the chip, but I'd give it a 70% chance that it is a time delay relay. Not knowing anything else about the boiler, it could also have something to do with monitoring the pilot flame.

It's still a guess! Care to share any more details, such as a schematic?

Interesting, the mystery chip is in a DIP socket. This implies either the manufacturer expects this chip needs to be replaced at some time or that this is a DIY prototype assembly. In either case the chip part number should be readable. Looking at the edge of the circuit board it also looks like this is a single sided board. A good technician with just a VOM should be able to reverse engineer this whole device then.

What did you want help with?

In order to identify the relay function the relay position in the control circuitry must be known.

Please provide a schematic if you want correct answers.

You say that as if it is not already obviously true. Don't worry, they apparently only know how to remove the cover. They do not even know how to orient the camera to provide useful information. Let alone what to do with a translation of that information.

Whatever they do, they should never cut the blue wire.

http://www.manualslib.com/manual/69577/Honeywell-Rm7800e.html
http://www.burtonmech.com/filerequest/1726.pdf
https://customer.honeywell.com/en-US/Pages/category.aspx?cat=HonECC%20Catalog&category=RM7840&catpath=1.3.2.2.21
http://www.fireye.com/products/pages/burnercontrols.aspx

Thanks to All reply, sorry for insufficient information with regards to picture attached. Due to its age, cant find any label in its cover. Also sorry, cannot post schematic/wiring diagram for the client cannot provide. This is an old boiler which has been transfered ownership for 3rd or 4rt time already. Have tried goggling wiring diagram for this model but cant find any. Presently tracing actual control wiring just to find its purpose. Have contacted CICI boilers already & waiting for reply. Anyway, please see picture below.

Waiting for reply? Why wait when you can get instant answers over the phone? Unbelievable.

Now I see enough that I can provide some translations of the circuit topology.

I'm not sure where the transformer fits in this circuit but my leading idea is that this part both surge protects this module and provides the power for the rest of the circuitry. There are three diodes next to the ice cube relay. One diode suppresses the fly back voltage from the ice cube relay. The other two diodes and blue capacitor perform a full wave rectification and storage to make a DC supply for the IC. I believe that IC is a 555 timer. The black capacitor, the five resistors and adjustable potentiometer establish the amount of time delay the 555 timer circuit requires to eventually turn ON the ice cube relay. One of the five resistors might guarantee a quick discharge of the blue capacitor when the transformer gets externally turned OFF.

The double bobbin, double insulated transformer is usually found as the interface between a 24V thermostat circuit and the line voltage control circuitry, so this may be nothing more than a the way that the external temperature control system signals the boiler to start and stop firing, but there are many uses for this type of circuitry in a BMS (Boiler Management System).

Exactly where does this fit into the control scheme, what is the problem, and what leads you to believe that this unit is the cause of all your problems? Also which FMS (Flame Management System) do you have, the Honeywell RM7840L or the Fireye E110/EP160? If it's part of one of those systems then you must go back to the proper vendor for a replacement.

Repairing a module that's part of a FM or UL burner system is a tort lawyer's dream if the boiler ever blows.

You are absolutely correct about the liability issue. However, when one does not have a part number or service manual for a system in need of repair one must start somewhere gathering information so one can decide if a proposed replacement will be a suitable aftermarket replacement. Reverse engineering [not repairing] this presumably failed control module is the only methodical way I know of to determine if any replacement part will work from the information provided.

I would think, provided the components and values can be identified, that any competent electronics tech. could build a new one of those in short order.

Assembly is certainly not the problem here. The problem is your stipulation of component identification, values and configuration of a presumably failing component.

There was an information already via email, no need to call principal.

Thanks to all replies....

Thanks to All, according to CICI Boilers "I believe the part in the photos is a Warrick low water cutoff relay. I've attached the factory spec sheet."

http://ecatalog.gemssensors.com/ecatalog/warrick-controls/en/16MK3A1

Again, thanks to all replies and comments