parts on Sunday just north of Boston

Big Ed_3

A local service Pro should have it on their truck . Give them a call.

allenh

parts on Sunday just north of Boston

Need Honeywell high limit # L8148E for Burnham Revolution. Anyone know where I can get this before Monday?

kevin coppinger_4

I have a...

8148a...will that work?

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brucewo1b

I Think the

E has low voltage on B1 And B2 for gas burner, Do you have an FW Webb near by usually they have an after hours number

Singh_6

fuse

I guess you checked the for blown fuse already.

Chris_82

Next time in webb or portland get the phone numbers of some of the sales people! It's supposidly part of their job? can try the box stores sometimes...an equivelant ?

Bob Gordon

We have 4 in our location in Billerica. Let me know if you need us to open the location.

allenh

could I get one today, Sunday?
Email me at allen@massrha.com

allenh

ya the little white soldered in fuse is fine. No 24 output to gas valve. Transformer is good, relay is picked visually.
From troubleshooting block diagram controller is kaput.

rjm

6006c&sr501-- come on be creative..

Unknown

Allen

If the transformer is good and the control relay is pulling in, I would suspect that the internal resistor for the damper plug has blown. I would try jumping out the two center pins of the damper plug connection. As you know, there is no damper on this boiler and the control has a resistor soldered into the board connection for that plug. We began installing a jumper plug several years back to manually jump out that plug. Try this first as that's a very expensive control to replace if there is nothing wrong with it. Hope this helps.

Glenn Stanton

Manager of Technical Development

Burnham Hydronics

U.S. Boiler Co., Inc.

allenh

I cannot find anywhere on line the schematic of this part.
Transformer is good - reading 28 volts a.c.
Relay is picking. Visually both sets of contacts are closing.
I did reseat that molex connector. Wires and contacts looked good. I do not remember how many wires were in the molex plug but I do remember that 2 were simply jumped out.
Is there is no resistor in the molex plug will that damage anything? What is the value if its cooked? It must be small.
The soldered mini fuse is fine. Removed board and visually inspected by saw no arc marks or lifted etches / lands.
I was tempted today to use the 120 volt a.c. power from C1 & C2 to power an outside transformer but didn't know what I would need to power the gas valve and blower relay control circuit. Would that have been safe?

After studying this H.W. part is this its function?:
It takes 120 volts at L1 & L2 and outputs 24 volts at B1 & B2..
When T & T from external thermostat calls and boiler set point is below 210 the relay closes.
One set of contacts is for a.c. to the Vs-300 controller and internal circ pump.
Other side of relay is 24 volts a.c. for powering the ign module and the blower relay control circuit.

If I cannot find one of these controllers tomorrow what if I were to use a.c. power off C1 & C2 and ran an external transformer (like a small door bell one)? Would a simple door bell transformer be sufficient to power the 24 V side of things?

brucewo1b

can't use

C1 & C2 as you would not have a HL to turn off burner, and if there is a LL it would not let burner on until it reached min temp

Try this
http://customer.honeywell.com/Techlit/Pdf/95-0000s/95-6940.pdf

allenh

oh well... I will try to find the correct part in the morning.
I was thinking that both sides C1 / C2 & B1 / B2 were being switched by the relay. But there were only 2 sets of contacts.
Its tough to try to figure things out with an actual schematic; in the dark with a drop light; with a board hanging out sideways :-(
When will someone come up with a part that is interchangable and can be programmed to do certain functions?

Unknown

Allen

If this one had the jumper installed, it should have the jumper wire installed between the two center terminals (center of one side to center of other side. If the wire jumper is installed from the center of one side to the adjacent corner pin, it is an older type jumper plug. Try unplugging the jumper plug and inserting a manual jumper wire between the two center pins like the attached drawing shows. This will bypass the internal resistor.

Glenn Stanton

Manager of Technical Development

Burnham Hydronics

U.S. Boiler Co., Inc.

Unknown

Schematic

The 1K relay is switching both 120v and 24v current. The 1K1 contact of the relay is swithing the current to C1 and the 1K2 contact of the relay is switching 24v current to B or the high limit switch. I have attached a simplified version of the schematic. This does not, however, show reference to the damper plug circuit and internal resistor. Please try the manual jumper before changing out the control.

Glenn Stanton

Manager of Technical Development

Burnham Hydronics

U.S. Boiler Co., Inc.