Question about Navien CH-240-ASME-NG Combi Condensing Commercial Water Heater/Boiler

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Outside air intake pipe get small amounts of snow on it and shuts the furnace down. I have a Navien CH-240 ng

The boiler has a sensor that cuts off the boiler if it thinks there's an obstruction on the air intake line. If I get the slightest amount of snow on the pipe it automatically shuts down the boiler

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2 Answers

I have a greenstar boiler its 16 mths went out today blue light flashing checked the condensation pipe was frozen have cleared it out the flue looks ok but im 72 years old its snowing and its bitter


The condensate pipe must be piped into an interior drainage pipe or it will freeze. Turn off the red emergency burner switch to reset the boiler. Also make sure that your flue pipe is clear of snow and doesn't have residual condensate freezing up and blocking it. If it is not pitched back to the blr, it can freeze and clog the flue. This will cause your press switch to cut out on high pressure.

Mar 01, 2018 | Water Heaters

1 Answer

Hi my baxi 105he dhw has stopped heating the water flow rate is ok,when i try ch the temp led,s rapidly rise up to 80 degrees then the boiler shuts down


Indicates low water flow. possibly bad electrical connection to flow detector in dhw pipe or seized dector in pipe or blocked up heat exchanger. certainly a blockage somewhere in the pipes

Oct 11, 2017 | Water Water Heaters

1 Answer

What is the minimum vertical vent distant from top of water heater to top of cap. Water heater is stand alone outside furnishing water for military force provider showers unit.


Generally 40 feet for ordinary atmospheric-vented household water heater...
Straight run to roof.
Atmospheric means no power vent... just hot air drafting upwards
Google search: gas vent height code

Atmospheric venting code depends on 4 basic factors:
Diameter of vent--- bigger vent, more draft
How many water heaters are connected to same vent
BTU per hour rating of water heater-- the more gas that is burned per hour, the bigger the vent needs to be
How straight the pipe is -- are there any horizontal or lateral runs
http://www.ameri-vent.com/files/assets/files/1366372183_Sizing26ApplicationGuide1.pdf

http://waterheatertimer.org/pdf/Bosch_Checking_the_draft.pdf
http://waterheatertimer.org/pdf/checking-the-draft2.pdf

Other factors can include
-wind conditions... higher wind across top of vent pipe on roof can reduce draft, and cause downdraft that blows deadly CO into same room as water heater
-vent termination near high walls, trees, high roof peak etc will reduce draft or cause downdraft
-amount of incoming air supply... if water heater is inside a closed room, then there is no air to draft up the pipe, burner will shut down or burn lazy yellow instead of clear blue
-stuff piled up around water heater that obstructs air intake
-dirty air intake screen that reduces air intake
-vent fans inside same room as water heater that pull air down the vent and cause reduction in water heater draft
-generally elbows reduce draft by 10%
-vent cannot terminate near any window door or air intake for another gas appliance
-bird build nest on top of vent pipe after vent termination falls off
-highly acidic gas by-product causes large amount of condensation inside pipe that burns hole in pipe or drips down and damages combustion parts...blower and inline condensate trap and drain might be required
-multiple water heaters installed on same vent line.

Gene
Water Heater Timers Save Money

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Mar 27, 2015 | Water Water Heaters

1 Answer

Worcester 350 combi boiler on but water cold and radiators cold. Have put pressure up but made no difference. What's wrong with it?


If the inline pump is not working no hot water will flow into your radiators. The pump pushes the water in the lines to create a water flow. Increasing the pressure will not help in this case. I recommend you put the pressure back down as it usually is preset when the boiler is installed. My pump is about three feet back of the boiler on the intake line. If you don't know what you are doing I recommend getting a repair man as you could create more problems by over heating the boiler its self and blowing the electrical parts up.

Feb 06, 2015 | Water Water Heaters

1 Answer

My boiler is providing hot water but will not heat my radiators


It's possible that you have an air lock in your lines somewhere. Your radiators should have a know that you can turn to bleed air from your system.

Oct 16, 2014 | Water Heaters

2 Answers

What size fresh air vent do I need in a boiler room with a gas boiler and gas hot water heater with about 220,000 btu combined


I suggest that you run a duct that is 3 inches larger than the furnace duct . and you should run it down close to the floor and aim it in the direction of the furnace. this will trap warm air above the vent and supply an adequate supply of air for combustion. also make sure you have insulated any pipes in the furnace room that carry water or steam you want heat where you live, not going up the chimney.

Aug 02, 2014 | Water Heaters

1 Answer

No Hot Water


Hard water contains a lot of minerals and depending on how hard the water is also depends on how often you must replace the filters. A much better alternative is to have a water softener installed before your hot water heater and any other sorce of domestic water supplying your home. I have one and it works great. Just be advised that you will need to replace the salt crystals every couple of months depending on the time intervals you set the timer to. If you find that the water still remains soft after two months and your filters are not to badly clogged then you may try adding salt every three or four months and see if that solves your problem. You also have to remember that your also using the water for drinking cooking and bathing so softening your water supply is very important especially if you or anyone in your household ever had any kidney stones or kidney problems.

Good luck,

Marty

May 08, 2014 | Navien CH-240-ASME-LP, Combi Condensing...

1 Answer

Vokera mynute 28 se, plumber has replaced fan and swithch as the burner would not cut in, was beeter for a year or so, in trying to find the problem again, he has discovered that if the front plate closing...


It sounds to me like the outside air intake (your boiler requires outside air for combustion) is plugged. Bird's nest, maybe? Leaves? Spider webs? Have the plumber check outside AND where the intake air connects to the boiler.

Nov 05, 2013 | Water Heaters

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