Comments on: Baxi Condensing Boiler HT380

By: tom

tom — Tue, 16 Mar 2010 20:41:34 +0000

On the baxi ht380Ht what size black iron pipe should the primary loop be? I have 2 copper zones and both are 3/4″, and I only have 1 bathroom. Shoule it be 11/4″ black iron pipe with the closely spaced Tees?

By: Robert McHenry

Robert McHenry — Tue, 16 Mar 2010 14:03:37 +0000

Baxi Luna (sorry)

By: Robert McHenry

Robert McHenry — Tue, 16 Mar 2010 14:03:04 +0000

I purchased a house last year that has a Baxi Lunt HT-330. I love this boiler! Has been working like a charm! The valve that switches between Hot water & heating makes a funny noise but for just a second. My wife could not figure out what was making the noise when she first herd it. The circulator pump froze up but I was able to shut down, remove the circulator & free up the impeller. I have since replaced the impeller keeping the original as a spare. I’m in the process of installing the remote outdoor temp sensor. Other than that the only thing I’m missing now are high Natural gas bills!

By: BWS

BWS — Tue, 16 Mar 2010 09:53:04 +0000

Jeff,

This leads me to think that you may have LP gas for your boiler. The gas valve comes from the factory set for natural gas and must be properly setup for propane gas. This is something that a heating tech would do with a combustion analyzer and the controler that came with the unit (adjusting 2 settings). If your unit runs on natural then the gas valve will still need to be dialed in as there is currently too much gas on ignition. A properly installed Baxi should light off quitely each time. Hopefully you have or can have this issue easily fixed by a service tech in your area.

By: Matthew

Matthew — Sat, 16 Jan 2010 09:47:50 +0000

I had my technition who set up the system come back out. He used a combustion analyzer the first time and hooked it up again. He said that the gas pressure had changed from when he first set it up. I have an 1-1/4″ line coming in so there is plenty of volume. The gas supplier must have changed the pressure or it just fluctuates from time to time. This was causing it to fire abnormally during low fire. He was getting 8″ in water (if I have that right) when he set it up and now he was getting 6″. He re-adjusted things and it is running quietly now on low fire.
Thanks for the advice!

By: tom

tom — Sat, 09 Jan 2010 08:23:39 +0000

Thanks steffan for the info. I am in the process of trying to find a qualified tech in my area. I live in western massachusetts do you know any tech out this way ,does anyone?

By: steffan

steffan — Fri, 08 Jan 2010 20:07:37 +0000

did he use a combustion analyzer to set the fuel air ratio if not get another tech to do this correctly. i think this is your problem not the pump

By: steffan

steffan — Fri, 08 Jan 2010 20:01:33 +0000

I have installed many baxi boilers both the ht 380 and the 1.330 with or without the modulo tank, and my advise to you is get a technician that has been through the factory training program. these boilers must be set up with a combustion analyzer. the flue gasses must be exactly within the parameters set by baxi. If your installer did not adjust the parameters for fan speeds and fuel pecentage your boiler will not only be less efficient than it should be it will reduce it’s life expectancy and cost you money for untrained personnel repair bills. my advise to you is do your homework and hire a traained professional to complete your installation correctly.

By: tom

tom — Thu, 07 Jan 2010 21:47:02 +0000

I had a baxi luna 380 installed last year and I get the same humming noise. It is coming from the circulating pump. I think it is because the zone that demands the most steps down from 3/4 pipe to 1/2 inch feet from the unit constricting the flow which is making the pump work harder than it should. It only happens when heat is being demanded for that zone often. Otherwise there is no humming. I had the installer over and he adjusted the flow on the pump which has 3 settings. I went to the lowest setting for the pump and it seems to work fine. You can take the cover off the boiler and there is a dial on the circulating pump which is a grundfos. I am planning on increasing the line to 3/4 up to the first radiator and then putting the pump back to the number 2 position. I will post the outcome.

By: Matthew

Matthew — Tue, 22 Dec 2009 20:03:19 +0000

I can identify exactly with Nicholas Lamb and Jerry. My Baxi was installed 11 months ago. About a month ago we started hearing the loud vibrating rumbling sound on start up (but not every start up). When I’m outside I can here the sound quite clearing booming out of the exhaust pipes.
I don’t have any answers yet either but would love to hear if anyone else does. If I find something I’ll share. Otherwise I love the boiler.