×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Boiler return temperature codes

Boiler return temperature codes

Boiler return temperature codes

(OP)
I'm looking for the specific code reference that condensing boiler manufactures have to abide by to get certification.  What code references the return water temperature through condensing boilers.  I have some high efficiency condensing boilers that automatically cycle the bypass valves to self calibrate.  The problem is that the boilers are rated for return water down to 50 deg F, but the valve cycling full open/close does not maintain the interal water temperature adequately to stop condensation in the primary heat exchanger.  The net result is that the interal boiler controls are violating their own operational parameters by allowing the bypass valve which is designed to maintain temps above 130 deg F to allow lower temperatures to hit the primary heat exchanger.  The condensate will destroy the primary heat exchangers

In summary............does anyone know the code reference so I can throw it back at the manufacture?

Thank you..........


p.s. No, we can't raise the outgoing temp,nor can we disable the automatic valve calibration.

RE: Boiler return temperature codes

You  may be  out of luck.
there is not Code mandating performance other than ASHRAE
your only choiceisto work with the mfr. by asking their advise.
you may want to add a metering oriffice in the return that  way when the bypass opens it will be  metered.
ER

RE: Boiler return temperature codes

(OP)
I think you are correct.  The manufacturer will have to get involved.  They put floating poing valve actuators on the system that havet to recalibrate every 18 hours.  Compounded by burning the calibration command into the main chip, there is only a couple of ways of bypassing the situation....both take manufacturer support.  However, manufacturer support has been severely lacking during this project.  The listing agencies have files on the boilers that they list.  If all else fails, I can notify the listing agencies of issues and have them work with the boiler manufacter.

RE: Boiler return temperature codes

The listing agencies will not get involved in warranty   complains.
you are asuming their help but as I said you may have to fix it yourself.
ER

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources