Ask Experts Questions for FREE Help !
Ask
    nothandytw's Avatar
    nothandytw Posts: 7, Reputation: 1
    New Member
     
    #1

    Dec 1, 2007, 05:28 PM
    Banging noise when hot water baseboard turn on
    My hot water baseboard system was bleeded two weeks ago when the water flowing noise was heard.

    Now, every time when heat turn on, there are several big bang noise from the pipes on my second floor. Please tell me what is going on and what I should do?

    I last week, I changed new expansion tank. When bleeding the water, the pressure readout is 10-12 psi. When bleeding is finished and the water is heating, the pressure readout is 20 psi.

    Thanks!!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #2

    Dec 1, 2007, 05:37 PM
    Your pressure readings are fine. You still have air in the lines unless this problem has always been there and you are just now trying to address it. If this is a new noise problem go for more air removal if not you will have to Goggle (water hammer) and pick your poison as to the cure you want to take.

    In all the years of boiler service I never had to add a anti boiler water banging device to any system we installed so I would really take a hard look at the air in the line situation before you jump into other cures.

    Many times you have to bleed the baseboards for a long time before the air will come out and whenever you add fresh makeup water to a system you automatically get more air and it will take awhile for the air to fall out of suspension with the water as it heats.
    nothandytw's Avatar
    nothandytw Posts: 7, Reputation: 1
    New Member
     
    #3

    Dec 1, 2007, 07:19 PM
    Dear HVAV1000:

    I really appreciate your comments. I will try to bleed the system (for second floor) again to see if the problem can be solved. Please tell me usually how long does it take to complete bleeding. I have 3 bedrooms on the second floor. What is the pressure should I use to bleed the air?

    Hope to see your answer soon.

    Thanks again.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #4

    Dec 1, 2007, 10:28 PM
    You can operate the boiler while you are bleeding. The higher pressure makes it easier to bleed the air. Make sure you use a catch pan or use rags so the water does not make a mess or ruin something.
    nothandytw's Avatar
    nothandytw Posts: 7, Reputation: 1
    New Member
     
    #5

    Dec 2, 2007, 09:15 AM
    Hi, HVAC1000:

    I just finished bleed the air on the second floor where the banging noise happens.

    During bleeding, the water pressure is at 20 psi. I let it run for about 20 minutes.
    I turn the pressure back to 10-12 psi. Turn off the garden hose and turn off the pressure switch. Now the readout is 20 psi. Then I turn of power of heating furnace and let it go. When water is heated, the pressure is still at 20-22 psi.

    There are still banging noise when the water heat turns on. Does it mean that the bleeding is not completed?

    Enclosed with is the picture of my expansion which I bought new last week and installed.
    There is a small metal cup on the top of expansion. There is a little cap on the cup (arrow points at). What is the cap? Should I close it tight or loose it?

    I really appreciate all your help and comments.
    Attached Images
     
    nothandytw's Avatar
    nothandytw Posts: 7, Reputation: 1
    New Member
     
    #6

    Dec 2, 2007, 09:24 AM
    HVAC1000:

    Just a correction of the typo. "Then I turn of power..." should be "Then I turn on power ...".
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #7

    Dec 2, 2007, 11:11 AM
    Cap on top of tank should be loose and there is a shrader valve fitting under the cap. That is a auto vent. Can you send me the information off the tank you just bought? Name and all the numbers.
    The vent looks to me to be a number 67 Maid O Mist valve see if you can check the number on that also.
    nothandytw's Avatar
    nothandytw Posts: 7, Reputation: 1
    New Member
     
    #8

    Dec 2, 2007, 11:27 AM
    HVAC1000:

    Thanks for the response.

    I can not find any information of the cap. I loose the cap as your instruction. When the cap is opened, I see a needle-liked mouth.

    The expansion tank I just bought is: WATTS Hot Water Heating System Series ET Expansion Tank. Model ET-30. EDP#067411. I bought from Home Depot.

    Let me know if you need any information.

    Thanks.
    nothandytw's Avatar
    nothandytw Posts: 7, Reputation: 1
    New Member
     
    #9

    Dec 2, 2007, 11:29 AM
    HVAC1000:

    I have two zone heating system. My first floor does not have such noise at all. Should I also bleed the air when I bleed air from baseboard on second floor?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #10

    Dec 2, 2007, 05:21 PM
    It would not hurt to try and bleed the first floor. It may do no good but it will do no harm. Air has to be the problem.
    nothandytw's Avatar
    nothandytw Posts: 7, Reputation: 1
    New Member
     
    #11

    Dec 14, 2007, 10:07 AM
    I still have banging noise on my second floor hot water baseboard every time when the heat was tunred on.

    The heating water is directly heated up through a gas furnace and then sent out to the first and the second floor. In addition, the gas furnace is also heating up the water for and send to water tank. Is there any realstionship between water tank and hot water baseboard?

    I do no hear water running noise in the baseboard anymore, but still a big baning noise when heat turns on.

    My first floor hot water baseboard does not have any problem at all.

    Can you tell me what I should do? Do I still bleed the air which I have done several times already? At what extend can I stop bleeding and be sure that air completely out?
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
     
    #12

    Dec 14, 2007, 01:21 PM
    The bang is from expansion and air. You have done enough bleeding because if is not working correctly now it is something much more difficult to repair.
    Next step is to call for a professional to look over your setup to see what can be done about the noise. You will probably need to have them install a water hammer device in your system.

Not your question? Ask your question View similar questions

 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Baseboard Heat Banging Noise [ 11 Answers ]

Hello All, For starters I've searched this topic and haven't found anything that can apply to my situation. To set this up. We have a boiler/baseboard heating system that makes loud banging noises when it cycles off, on the first and second floor zones. When heating up it makes a creaking...

Banging noise when water pump comes on/off [ 2 Answers ]

We live on a well. Recently, there is a banging noise that occurs when the water pump comes on. The pump is in the well and the noise happens because the incoming pipe moves violently when the pumps cuts in and when it cuts out. We have lived at the house for 6 years and this just started. I...

Loud Knocking, Banging Noise when Hot Water is on in Kitchen. [ 4 Answers ]

HI, Loud Knocking, Banging Noise when Hot Water is on in Kitchen.I am returnign to a property that was a rental property. My home was built in the late 70's. No plumbing has ever been changed to my knowledge. When I turn the dishwasher on or the hot water on the kitchen sink the floor...

Banging noise from baseboard heating system [ 2 Answers ]

I own a condo which I rent out to a young couple. There are 6-condos in each building with a boiler in the basement sending heat to each condo-unit upstairs. Each condo has baseboard heat and it's own thermostat. Every time the thermostat shuts the heat off, a very loud "bang" is heard. ...

Loud banging upon turning off baseboard hot water system [ 1 Answers ]

Hi - we have baseboard hot water heat. When we go to bed at night we turn down the temperature on the thermostat, so the system shuts off for a bit as it cools down. After a few minutes we start to hear very loud banging or breakng noises coming from mostly one room of the house (our bedroom). ...


View more questions Search