Originally Posted By: whandley This post was automatically imported from our archived forum.
There are many types of flexible gas connectors, including, but not
limited to csst. I think the key word is “flexible”. I don’t believe you can run “any” flexible gas supply material through an appliance wall for fear of damage to same. The various codes appear to be pretty clear in that regard. I think in one of Jeff’s pictures, csst gas lines are clearly
connected to rigid pipe extending through the appliance wall. I believe
that to be the OEM safe, prudent, code compliant system installation.
Originally Posted By: Gary Reecher This post was automatically imported from our archived forum.
As a service technician I shudder whenever I see gas appliance hoses running through the furnace cabinet wall. You have a thin walled steel next to a steel edge. If the hose is rubbing against the edge of the cabinet hole vibration from the furnace will eventually make a hole in the hose. Then you have a gas leak. Whenever this situation is found the hose is replaced with rigid pipe. Lennox mandates the use of appliance hoses on their Pulse furnace installations, but only on the exterior of the furnace. The appliance hose cannot enter through the cabinet wall. There are exceptions to this manufactured (mobile) home furnaces where the gas pipe penetrates through the bottom of the furnace with shutoff then appliance hose to the burner manifold valve. The appliance hose does not pass through the cabinet wall its connections are inside the cabinet. Reason to prevent pipe breakage during transport of the home. These come straight from the factory where Federal H.U.D. inspectors approve this type installation.
Originally Posted By: roconnor This post was automatically imported from our archived forum.
Quote:
IRC G2414.5.3 Corrugated stainless steel tubing.
Corrugated stainless steel tubing shall be tested and listed in compliance with the construction, installation and performance requirements of ANSI/AGA LC 1/CSA 6.26
Quote:
IRC G2422.1.2 Appliance fuel connectors.
Connectors shall have an overall length not to exceed 3 feet (914 mm), except for range and domestic clothes dryer connectors, which shall not exceed 6 feet (1829 mm) in length. Connectors shall not be concealed within, or extended through, walls, floors, partitions, ceilings or appliance housings.
Also consider that CSST can NOT be installed where subject to damage ... which includes exposed outdoor locations and appliance cabinet holes without protection.
Just my opinion and 2-nickels ... 
-- Robert O'Connor, PE
Eagle Engineering ?
Eagle Eye Inspections ?
NACHI Education Committee
I am absolutely amazed sometimes by how much thought goes into doing things wrong
Originally Posted By: Heath Brier Johns This post was automatically imported from our archived forum.
Sorry guys I’ve been out of town. The CSST was running through the appliance wall and there was no rigid piping in the unit. The furnace was located in a hall closet. So did we decide that it was wrong? Thanks for the knowledge guys!
Originally Posted By: Gary Reecher This post was automatically imported from our archived forum.
I just checked the latest instruction manual dated January 2005 for Omegaflex Tracpipe. Has no mention of running their corrugated stainless steel tubing ( CSST) into the appliance. A question that I have is the csst bent more than the allowed minimum bend radius per tubing manufacturers instructions The picture really does not show the complete view of the tubing. Also the installation has no drip leg installed and no appliance shutoff valve within the vicinity of the appliance for servicing. Just a note one manifold burner manufacturer only provides electrical interrupt to the gas valve they no longer have a mechanically shutoff for the gas.
Originally Posted By: pkrzemien This post was automatically imported from our archived forum.
Gary, Thanks for the reply. Looks like there are quite a few manufactures of the csst including Gastite, Diamondback, Wardflex, etc. Didn’t ID the manufacturer so have to use csst in general. There is a drip leg and hand shut off valve installed. I may take some hits on this next part but: Inspecting the max bend per manufacturer is probably not something I’m going to get involved in. It’s a really good question , (and one I didn’t consider), buy my Agreement for Services specifically disclaims manuf. installation recommendations. Not that I won’t mention it if I have knowledge of the subject, (always learning), and/or time to research it but in general is beyond the standards. I have automatically defered this type of installation but after finally getting ahold of the state code guru his feedback is “ok with a rubber grommet”.
The AHJ is the "Authority Having Jurisdiction", ie city/county inspector in their given area of authority whether mechanical, electrical, etc.
Originally Posted By: Gary Reecher This post was automatically imported from our archived forum.
Chatted with a building inspector from Michigan on HVAC-Talk. Discussed the post about the CSST through the cabinet and he said no way would it be allowed in Michigan.
The picture really does not show the complete view of the tubing. Also the installation has no drip leg installed and no appliance shutoff valve within the vicinity of the appliance for servicing. Just a note one manifold burner manufacturer only provides electrical interrupt to the gas valve they no longer have a mechanically shutoff for the gas.