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Re: Thermostat or boiler controls?
You're observing the behavior of the thermostat……………nothing more.
On a cold day, it takes longer for the room to open the 'stat. Of course, the rads are more fully filled with steam and they provide heat into the space for a longer time period after the 'stat opens before it closes again.
On a warmer day, it takes next to nothing to open the 'stat and the rads have barely received steam. So, they don't have the residual energy to deliver to the room after the 'stat opens. So, the 'stat recloses earlier.
Depending on the 'stat, you can change the spacing between the cycles by adjusting the "anticipator". This also results in a wider differential in the room temperature……………..which may be undesirable depending upon the occupant(s).
LRCCBJ
Re: Steam Boiler?
It might, but then again, that thing was just installed and it's vibrating, so would a new valve block be any better?
Each of those mains should get a Gorton #2. This will necessitate removing the vertical nipples and bell reducers from the mains, and installing the proper bushings in the tees, but the difference will be amazing.
Re: Steam Boiler?
The feeder shouldn't be adding water regularly. The MM feeders are safety devices and the boiler level should be regulated by an attendant. As this fellow probably never wants to look at his boiler again, Steamhead's advice to replace the float control with a "smarter" water level control would solve the singing problem.
The MM control sings because the valve modulates. When it starts to open, there's barely a trickle, so it makes noise. The VXT solenoid valve snaps wide open and snaps closed, so no flow sounds like the MM. The Hydrolevel 711C manifold will need to be blown down regularly to remove sludge. If that's not done, you'll have a dangerous situation.
Maybe you can find a way to mount the VXT right on the boiler, but there's not much wisdom in beating on any of those old castings.
Re: Taco SR506 Switching Relay: thermostat Calls for Heat but zone not activated
LY2N-AC110/120
or
LY2-AC110/120
Looking at the data sheet the relay with the 'N', LY2N-AC110/120 has an indicator that the coil is energized, in this case probably an LED, with some relays it just appears as a mechanical color change.
I'm a little confused with;
" Created a jumped relay like this.
Will try this on next time the system fails. "
That left most relay is unique with the 120 VAC coil did you put the wire on it then take it back off ? Did you use a 24 Volt relay as a form or template to make the jumper ?
The only thing I don't like about the way you did it is the twisted wire, since it makes the wire twice as tall, reducing the effective pin length, the relay may not seat into the socket correctly, however it may be fine that way. If it rocks, keep it square or parallel to the socket or slightly justify it towards the coil pins a bit since I believe the the NC pins are not used. The goal is to make a valid test and not to introduce other things that can also be intermittent.
109A_5
Re: Snow Melt Thermostat - How to stop call for heat below 40F
Thanks again everyone. Tekmar sent me the 170 model, which has WiFi capability. The new thermostat is working great and is exactly what I needed for my snow melt application. Hope you all enjoy the upcoming holidays.
Re: Massive Corrosion on 10 year unit, What Next
None of the order of takeoffs, orientation, or really existence of the header as is shown in this diagram. it really doesn't even have a header in your installation.
mattmia2
Re: Short cycling boiler. I'm stumped.
The air in the tank will migrate thru the membrane of the tank causing a drop in pressure by about 1 PSI per year. The way it was explained to me is this:
Think of oxygen in the air (it makes up about 21% of the atmosphere) as having its own pressure that wants to be balanced. So when you pump air into the tank, that tank is about 21% oxygen and 78 % Nitrogen with trace amounts of all the other gasses to fill in that other percentage. Now the Air that is dissolved in the water in the boiler also has oxygen in it. But that oxygen gets depleted as it works on rusting all the ferrous metals in the boiler system. Not a lot of rust happens because the oxygen gets used up pretty quickly.
Over a short time all the oxygen that is dissolved in the water will become a part of the iron oxides that make up the small amount of rust that forms. (This is the reason you want oxygen barrier PEX tubing in the system so more oxygen does not migrate back into the system). That is also the reason you do not want to keep adding fresh water with a fresh supply of dissolved oxygen to a closed system regularly. You want to keep that new oxygen to a minimum.
As a result of the oxygen becoming chemically altered into other materials, the percentage of oxygen in the water becomes a lot less that 21% of the content of the air that is dissolved in the water The air in the atmosphere is at 21% and the air that is in the water is at something lower than 21% so there is that unbalance that strives to be balanced. If you have a barrier that allows the oxygen to migrate thru the membrane (like PEX tubing without the oxygen barrier) then that higher percentage oxygen on the outside will get into the water on the inside of the system. That is what is happening with the membrane of the expansion tank. Oxygen is migrating through the membrane. After a year that oxygen migration will account for about 1 PSI pressure drop.
So you need to add air pressure every season in order to keep the tank at the proper pressure.
This may not be the most scientific explanation but it gets the point across to us non-engineer, non-physicist, regular folk.
Re: Taco SR506 Switching Relay: thermostat Calls for Heat but zone not activated
It appears that both of those relays have identical ratings, dimensions and can be interchanged based on what is in stock.
Re: Pressure relief valve mounting
The loops in the floor, im filling them pushing the air out the other end, so it's wide open.
hunter29