Home |
Search |
Today's Posts |
|
Home Repair (alt.home.repair) For all homeowners and DIYers with many experienced tradesmen. Solve your toughest home fix-it problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
Posted to alt.home.repair
|
|||
|
|||
gas furnace register temperature question
Lately I had been noticing that the temperature of the "heated" air
coming out of my gas furnace was barely above room temperature, 75 degrees by my infrared thermometer. Filter is nearly new, flame is a perfect blue. Turns out that the problem was I'd opened up the registers to a couple of rooms, and the "redumbdant" register in the living room. After I closed the registers again, the temperature of the heated air shot up to 110+ degrees at the furnace. Now, my gut is telling me that this furnace is undersized for the house if I can't have airflow to more than one register in the living room, one in the breezeway and one in the main hallway without the register temperatures dropping to barely-above-ambient. Any expert opinions on this? House is 1300sq ft, furnace is 64,000 BTU, location is Rochester, NY. Former owners were snowbirds and the furnace never had to do more than keep the house at 50 over the winter. |
#2
Posted to alt.home.repair
|
|||
|
|||
gas furnace register temperature question
wrote in message ups.com... Lately I had been noticing that the temperature of the "heated" air coming out of my gas furnace was barely above room temperature, 75 degrees by my infrared thermometer. Filter is nearly new, flame is a perfect blue. Turns out that the problem was I'd opened up the registers to a couple of rooms, and the "redumbdant" register in the living room. After I closed the registers again, the temperature of the heated air shot up to 110+ degrees at the furnace. Is it able to maintain a decent temperature in the house with outside at zero or 10 below that would be common in your area? is the infrared giving the air temperaure or hte d uct temperature? The purpose of an ifrared thermometer is to get a reading of "things" that it targets so your reading may not be accurate. Try a probe or bulb and see what you get. There is also a specificatio for the heater saying what hte temperature rise will be. You measure both entering and leaving air and see the difference. That will tell you if the heater is functioning at capacity. |
#4
Posted to alt.home.repair
|
|||
|
|||
gas furnace register temperature question
|
#5
Posted to alt.home.repair
|
|||
|
|||
gas furnace register temperature question
This is an Amana furnace 80% efficient with a heat rise rating of 30 to
60 degrees. Can't remember the exact model number. Installed in 1999 IIRC. I'm using the infrared thermometer to measure the temperature of the inside of the register boxes about 7 minutes into the 10-minute cycle. The air temperature should be no more than a couple degrees hotter at that point. 75 degrees is fairly accurate. Given the cheap IR thermometer, it may be a couple of degrees off, but that's about it. My main complaint was the cold drafty feeling instead of the warm cozy feeling every time the furnace kicked on. Now that I've got the heat rise back, I've got the warm cozy feeling back. But I've got all the registers but three completely closed off with the dampers down in the basement. The house is warm enough to suit me, but there is a 7 degree difference in temperature from the living room to other rooms in the house (72 vs 65). One of the registers in the living room is completely dampered off, and the other one is wide open now, but damping that one doesn't seem to make much difference. Living room is right over top of the furnace and main plenum, so I expect some heat transfer happening there. |
#6
Posted to alt.home.repair
|
|||
|
|||
gas furnace register temperature question
Edwin Pawlowski wrote:
... is the infrared giving the air temperaure or hte d uct temperature? They are likely the same when the furnace is running, with the thermometer fairly close to the register. Raytek Minitemps have an 8:1 beamwidth, so you'd want to be within 8x4" of a 4" wide register. Nick |
#7
Posted to alt.home.repair
|
|||
|
|||
gas furnace register temperature question
|
#8
Posted to alt.home.repair
|
|||
|
|||
gas furnace register temperature question
wrote in message The house is warm enough to suit me, but there is a 7 degree difference in temperature from the living room to other rooms in the house (72 vs 65). One of the registers in the living room is completely dampered off, and the other one is wide open now, but damping that one doesn't seem to make much difference. Living room is right over top of the furnace and main plenum, so I expect some heat transfer happening there. One of the trick to a good hot air system is balancing the flow by opening and closing registers. You may have to play around a bit to get exactly what you want. We intentionally keep bedrooms cooler, no added heat in the kitchen, etc. What works for us may not for you so experiment. Blower speed is a factor also. Some keep the blower on constantly at a low speed claiming more even temperatures. |
#9
Posted to alt.home.repair
|
|||
|
|||
gas furnace register temperature question
On 24 Jan 2007 06:28:56 -0800, wrote:
Lately I had been noticing that the temperature of the "heated" air coming out of my gas furnace was barely above room temperature, 75 degrees by my infrared thermometer. Filter is nearly new, flame is a perfect blue. Turns out that the problem was I'd opened up the registers to a couple of rooms, and the "redumbdant" register in the living room. After I closed the registers again, the temperature of the heated air shot up to 110+ degrees at the furnace. Now, my gut is telling me that this furnace is undersized for the house if I can't have airflow to more than one register in the living room, one in the breezeway and one in the main hallway without the register temperatures dropping to barely-above-ambient. Any expert opinions on this? House is 1300sq ft, furnace is 64,000 BTU, location is Rochester, NY. Former owners were snowbirds and the furnace never had to do more than keep the house at 50 over the winter. IMHO, don't use a IR therm, use a dial thermometer. You might be actually pointing at an insulated part. Rather than poking a whole in your vent, like I did, you can go to registere and take a reading off that, since that is the actual temp supplied into a room. Just a guess.... tom @ www.YourMoneySavingTips.com |
#10
Posted to alt.home.repair
|
|||
|
|||
gas furnace register temperature question
I'm wondering if there is a major air leak in the return air.
Perhaps the furnace is sucking in only cold cellar air. It's one of those situations where someone has to come out and look, and look over the entire situation. I'm in the Rochester area. What part of the city are you in? -- Christopher A. Young You can't shout down a troll. You have to starve them. .. wrote in message ups.com... Lately I had been noticing that the temperature of the "heated" air coming out of my gas furnace was barely above room temperature, 75 degrees by my infrared thermometer. Filter is nearly new, flame is a perfect blue. Turns out that the problem was I'd opened up the registers to a couple of rooms, and the "redumbdant" register in the living room. After I closed the registers again, the temperature of the heated air shot up to 110+ degrees at the furnace. Now, my gut is telling me that this furnace is undersized for the house if I can't have airflow to more than one register in the living room, one in the breezeway and one in the main hallway without the register temperatures dropping to barely-above-ambient. Any expert opinions on this? House is 1300sq ft, furnace is 64,000 BTU, location is Rochester, NY. Former owners were snowbirds and the furnace never had to do more than keep the house at 50 over the winter. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
High Efficiency gas furnace - return air temperature | Home Repair | |||
High Efficiency gas furnace - return air temperature | Home Ownership | |||
GE XL44 Gas Range Temperature Drift...Inconsistent Temperature | Home Repair | |||
Gas Furnace Inflow Question | Home Repair | |||
Gas furnace question | Home Repair |