Checking Natural Gas Manifold Pressure
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- Опубликовано: 7 сен 2024
- Checking natural gas manifold pressure is very important to the health of the appliance to ensure it is not over firing or under firing. In most residential and light commercial applications the inlet gas pressure to the gas valve is approx. 7-14 inches of water column, but it can be 2 psi or higher. Outlet pressures can range but it is common to see 2.2 inches of water column in low fire and 3.5 inches of water column in high fire.
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Thanks for the great content! Appreciate the willingness to teach all of those looking to learn more about HVAC
You're welcome! Thanks for watching
HVAC Know It All trying to start up my own educational RUclips myself. If you wouldn’t mind checking out my first video I posted I would appreciate any feedback! No sweat if you don’t have the time! Just trying to help out the HVAC community!
What's the link, I'll check it tomorrow
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My first WATER manometer was DIY, a pair of cheap 6" rulers back to back and some plastic tube on a small piece of wood, some cable clamps to anchor them
For a fair amount of time I used a Bacharach blue oil manometer. It was nice but even back then--mid 80's refill oil for either it or the red oil for Dwyer was a ripoff. You DID spill these once in awhile. I serviced nat gas/ lpg, heat pumps, oil and electric hot air and a "few" boilers.
Water of course is a PITA as it gets below 0F up here. You have to drain it (in your truck) and either figure a way to carry a small plastic bottle, or fill at the homeowner's house. Of course during the day, just leave it near the heater in the van.
Water can also "stick" in the tube (surface tension) You need a tiny amount of detergent, etc, to kill the surface tension
Had a plumber tell a customer they needed another regulator on the boiler. I get there after it was installed. The boiler wo t fire property. The plumber comes back and I asked him why he installed another regulator. He said he was told to. I had him remove the regulator. We tested the manifold pressure. All good. I asked him if everything was back together. He said yes. The next day I get called to the same location. The fire department is there. I found he had left the plug out of the gas valve. WTF?
Thanks for the great content. Very helpful. Is it ever possible to have zero water column pressure coming out of the valve and still have 3 blue flames? I had a heater tech show me zero on his manometer yet the heater was running. Told me my flames were lazy. They looked good to me. Told me I needed a new gas valve. I think I got scammed. 0 gas would equal zero flame, yes?
Some burners actually have a negative pressure, that's stuff that should be on the name plate.
Hey thanks for the great video. Can you use the 510 to measure the incoming on 1 port and out going gas pressure on 2nd port?
Yes of course