new heil furnace loud burners
#1
12-05-20, 05:41 AM
new heil furnace loud burners
my son had a new heil 96% efficiency 2 stage furnace installed last month. I was up there last week and he was telling me it was louder than the old furnace. I listened to it and had him turn up the thermostat and the furnace itself was quiet running on the inducer fan, but the burners lit up and seemed to be unreasonably loud. is this something normal with the new furnaces? it was professionally installed, so I can't imagine they didn't check the operation of the unit before they left. sorry I don't know the model no. , I know some of you folks on here are installers and was wondering if this noise is normal or something to worry about?
#2
12-05-20, 08:46 AM
Member
Was the gas pressure checked after startup? It must be.
Could be too high causing excess noise -> being over-fired can damage the furnace and produce high co as well.
The burners should be almost inaudible with the combustion air pipe connected.
Without, you should hear them clearly but shouldn't be excessive. Combustion air from outside has other benefits.
Could be too high causing excess noise -> being over-fired can damage the furnace and produce high co as well.
The burners should be almost inaudible with the combustion air pipe connected.
Without, you should hear them clearly but shouldn't be excessive. Combustion air from outside has other benefits.
Last edited by user 10; 12-05-20 at 09:27 AM.
#4
12-05-20, 10:22 AM
Member
Yes, call the installer and make sure he checks manifold gas pressure.
Normally 1.5 to 1.8" on low (depends on unit) and 3.5" on high at normal altitute and gas energy content. The manufacturer has very specific instructions for setting it up.
With the 2-stage unit on a regular t-stat, after 16 minutes max you should hear burner and fan noise increase as it switches to high. For 2-stage t-stat, should hit high shortly after raising the setting.
Most of the time, it should only run on low.
If there's nothing wrong, ask for combustion air from outside if it's taking from inside now.
Normally 1.5 to 1.8" on low (depends on unit) and 3.5" on high at normal altitute and gas energy content. The manufacturer has very specific instructions for setting it up.
With the 2-stage unit on a regular t-stat, after 16 minutes max you should hear burner and fan noise increase as it switches to high. For 2-stage t-stat, should hit high shortly after raising the setting.
Most of the time, it should only run on low.
If there's nothing wrong, ask for combustion air from outside if it's taking from inside now.
#5
12-06-20, 04:43 AM
he had a new 2 stage thermostat installed when he got the furnace, so that might be why the furnace went to the high side on startup? I will tell him to call the installer and check the pressures just to be sure. already getting combustion air from outside. thanks
#6
12-06-20, 10:21 AM
Member
it may not be wired to control the stages.
it shouldn't be terribly loud on high especially with air from outside.
it shouldn't be terribly loud on high especially with air from outside.
#8
12-06-20, 03:26 PM
Member
One thing i'm curious about is if the old furnace was also high efficiency, direct vent.
The old ones usually have a burner box inside the cabinet which reduces burner noise.
All makes except for lennox have stopped using burner boxes - the cabinet makes the seal. The sheet metal of newer ones is also thinner than before.
There's a high probability there's nothing wrong with this furnace, but it's good to check.
The old ones usually have a burner box inside the cabinet which reduces burner noise.
All makes except for lennox have stopped using burner boxes - the cabinet makes the seal. The sheet metal of newer ones is also thinner than before.
There's a high probability there's nothing wrong with this furnace, but it's good to check.
#9
12-07-20, 10:23 AM
I will check as I was thinking about having the same guy install a couple for me next spring. I did 3 estimates on these units heil 60k btu 96 percent furnace and 2 ton central air at 16 seer for 3850 after rebates for the complete installation. I thought it was a good price and was definitely the lowest of the 3 bids. I have older goodmans now that are 20 years old. I wonder if the new ones will last that long. thanks for all the info and help.
