Joined on December 16, 2003
Last Post on December 8, 2013
@ December 8, 2013 5:45 PM in 1942 Great Old Pic w/ Bacharach FyriteI couldn't count how many times I used one of those to set up a gas conversion burner in years past.
The new units sure are easy. Expensive though.
@ December 8, 2013 5:34 PM in Munchkin T80 - Maintenance questionscombustion testing of high efficient boilers should be done yearly.
If you had to replace the swirl plate I would check to make sure you are not getting exhaust reversion. The vent pipe should be at least 18 inches above the intake.
If you find another T80 make sure it is not an 04 - they had vent problems inside the boiler.
Personally I would maintain what you have and replace it with the EFT version when it fails.
@ December 8, 2013 5:19 PM in alternative endurance flow switchIs that basically the same switch as the Trianco heatmaker used?
If it is - it really isn't a flow switch but a pressure differential switch.
@ December 1, 2013 9:39 PM in Circulater for condensate loop off of steam boilerMark - I agree it should be bronze or stainless, AND I did not imply it was proper.
All I said was if he got 5 years out of the old one and a new proper pump is at least 2 times the cost. It might be OK to just install a new pump of the same.
OH and the boiler itself is cast iron. Yes everything not bronze, brass or stainless gets real nasty with rust.
I never install a wet rotor pump on a condensate loop. I use air cooled. But they don't live long either due to the heat and crud in the water.
@ December 1, 2013 7:00 PM in Circulater for condensate loop off of steam boilerIts not the volute rusting out that worries me. It is the WET ROTOR bearings being destroyed by the crud in the condensate water. The volute will outlast the bearings. I can't understand how they lasted 5 years.
@ December 1, 2013 12:05 AM in snow meltThe 667 will control the snowmelt pump AND open the HEAT zone valve.
The heat zone valve will open and turn on the boiler pump and boiler.
You Will need a control like the Tekmar 667 to control the snowmelt and ensure that you maintain a minimum boiler return temperature.
The size of the pumps, zone valves and heat exchanger depends on the amount of heat needed for your snowmelt system.
And you want a high Cv valve.
A valve with a Cv rating of 8 will flow 8 gallons per minute of water with 1 PSI of pressure drop.
A Cv of 16 will flow 16 gallons at 1 PSI.
@ November 30, 2013 9:42 PM in Circulater for condensate loop off of steam boilerYou can't use a wet rotor pump. I can't believe it lasted this long. The condensate water is incredibly dirty with sediment. The sediment gets in the bearings and destroys them. The right pump is going to cost a lot more than an 007 so if you got 5 years out of this one you might want to just install another and cross your fingers..
@ November 30, 2013 9:29 PM in snow meltWhat I did was use a high flow zone valve to feed boiler water to the flat plate. The Tekmar control opened the zone valve and the zone valve started the boiler.
ONE important thing you need to know though is you will have boiler water without antifreeze on one side of a piece of metal inside the flat plate and potentially sub freezing snow melt water on the other side. If the zone valve fails or the boiler doesn't heat You are going to freeze up the flat plate.
What I did was install a well and aqua stat on the boiler outlet port of the flat plate and set it for 36*. If the boiler water coming out of the flat plate is below the set point it turns the snow melt loop pump off until it warms up. Don't use a strap on aqua stat it won't respond fast enough.
@ November 29, 2013 9:17 PM in Lochinvar Knight KBN 399 Heat Exchanger FailureThe Lochinvar WHN is a Wall Hung Natural gas boiler.
Just make sure to get the new fire tube design. Much better design.
@ November 28, 2013 8:37 PM in two pipe p/sYou just don't have enough boiler to do both. You can do an off switch as long as the customer doesn't expect instant melting. The tekmar will help.
@ November 28, 2013 8:10 PM in two pipe p/sThe boiler loop with the closely spaced tee's is a primary / secondary system.
A hydro separator would work but it costs a lot more than the tee's.
@ November 28, 2013 8:08 PM in two pipe p/sA return header then the closely spaced tees, air eliminator and then the supply header. That way the boiler gets the flow it needs and each load gets the pumped flow it needs. The Tekmar control will solve the boiler not being able to heat the house but it won't melt snow either. I went down this road many years ago when a salesman told me what he had sold. One boiler for both house heat and snow melt. 900,000 BTU boiler to do both and when it got real cold it wouldn't keep the house at 70*. The customer had a long driveway 400 ft with 200 ft up a steep hill.
I couldn't turn the snowmelt off at 0* because of the hill.
Do you have enough money in the job for that Tekmar - they aren't cheap.
@ November 28, 2013 7:16 PM in two pipe p/sInstead of the second system loop with the big pump I would have just done a return and supply header and ran a much smaller ( properly sized ) pump for each supply circuit. That second loop just adds a LOT of cost and no added benefit. It doesn't have enough mass to stop short cycling. I would not tie the snow melt into that boiler that is heating the house - it isn't big enough to do both jobs and the house heating will suffer unless you do an injection system that maintains a minimum supply temp. 3 280 foot loops is a LOT of snowmelt for a 120,000 BTU boiler.
@ November 28, 2013 7:05 PM in Lochinvar Knight KBN 399 Heat Exchanger FailureThe heat exchanger didn't fail - the drum it is contained in failed due to chemical erosion from Freon contamination. Any stainless steel heat exchanger will fail if exposed to the same contaminants.
@ November 28, 2013 6:44 PM in Troubleshooting AprilAire HumidifierIf you are using a current sensing relay try making a loop with the wire it is installed on so that it has two loops under the clamp.
@ November 28, 2013 6:40 PM in two pipe p/swet rotor pumps should be installed with the motor armature horizontal.
The boiler P/S closely spaced tee's - I usually install first and then the air elimination system and then the system pump. Where the supply line comes off of the boiler going up and then down to the closely spaced tee's tends to trap air did you install an air vent at the high point? I try to make the air eliminator the high point of the system. Why didn't you go with the new tire tube design?
@ November 6, 2013 10:51 PM in Lochinvar Knight KBN 399 Heat Exchanger FailureIs this on propane?
This leakage is caused by erosion due to highly corrosive condensate.
I have seen this happen before.
when these boilers run on propane they build up a mud coating on the bottom pan. If the boiler has exhaust gas reversion the condensate will be highly acidic.
That boiler had the bottom eaten out.
@ November 6, 2013 10:36 PM in Cast iron radiator not getting hotThe pump is not big enough. A Taco 007 will not creat enough flow to make the monoflow tee's work.
Spacing the tee's farther apart won't help much. The tee's create the pressure differential due to the venturi inside one of them. If you need more flow then you install two with the arrows in opposite directions. Installing a stronger pump WILL make the entire system work better. Also if this is an old cast iron system there should be a 100 grain strainer in the return pipe before the pump as it is installed now.
@ November 5, 2013 10:30 PM in Cast iron radiator not getting hotThe pump that comes with a boiler is not always the right pump for the system. The pump MUST be sized for the total combined load and monoflow systems are VERY restrictive to flow.
There isn't a good pump that fits your needs. We need to know what your boiler is fired at.
BUT the Taco 0014 or the Grundfos 26-99 FC on medium speed would be my best choice. I think the Grundfos is a better pump.
You are not going to like the price.
The company that installed the boiler should install the new pump on the supply line at no cost to you. This will teach them a lesson to do the job right next time.
@ November 5, 2013 10:10 PM in Cast iron radiator not getting hotThe pump must be on the supply header AND you need to install a bigger pump.
A mono flow system needs a pump with a higher head ( at least 15 ft.) GPM must be at 10% of output BTU of the new boiler.
That TACO 007 isn't gonna get it.
That installation is a perfect example of selling a Cadillac but installing it like a YUGO.
People shouldn't be able to buy high tech boilers and furnaces without going to factory class. I have
@ November 4, 2013 10:16 PM in Knight boiler problemsThe new blower will come with the wheel - it is a complete unit.
@ November 3, 2013 7:07 PM in Knight boiler problemsIt is not anything getting into the intake pipe that is causing the build up. This build up is normal for this type of boiler. Flue gasses getting drawn back into the intake pipe Will destroy the blower and the control module.
A dirty heat exchanger can not cause a fan over or under speed fault.
The control sets a certain RPM and the fan has to run within a range of that rpm. If it doesn't then you get the fault. The control is not looking for a given airflow. It is only looking for a set rpm. A plugged heat exchanger will cause lower air flow and thus lower gas flow. The control will continue to raise the rpm up to the maximum as the heat exchanger gets dirtier. Same principal as an ECM blower speeding up as the filter gets dirtier.
The plugged heat exchanger will result in a higher rpm than a clean one.