Question about Air Conditioners

1 Answer

I have a gmpn-80 janitrol 90% eff gas furnace,it is only 15 months old,my condisation tray is melting and cracked do to heat in which case leaks water all over....why would this be happening?

Posted by on

  • ride017 Jun 28, 2008

    I had a tech from the company who istalled the unit check the gas pressure and fan speed,he said they checked out properly.My warranty ended three months ago so they are trying to avoid fixing it.....I say it was an improper install or manufacture default.In your opinion ,do you think a problem in the existing duct could cause this problem as far as air draw?thx for the help

×

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Scholar:

    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 104 Answers

Most likely the cause is that the furnace is firing too hot. When a furnace is installed and set up, the manifold gas pressure and fan speed has to be set by the technician so that the temperature rise through the furnace is a maximum of 50 deg F (i.e. if air enters the furnace at 68 deg F it come out no hotter than 118). The target temperature rise on any gas furnace is anywhere between 30 and 50 deg F. If the furnace runs too hot, either the manifold gas pressure must be turned down or the fan speed must be turned up to keep in this range.

Posted on Jun 28, 2008

  • Chris Lyon
    Chris Lyon Jun 29, 2008

    That is a possability. The big key is to measure the temperature difference through the furnace. Take a temp reading at the return vent and then take a reading at the closest vent to the furnace. Turn the furnace on and allow it to run for about 10min before checking temps so that the heat exchangers and duct work can get completely up to temp. If you are in the 30-50 range, then you are looking at install problem, mfr defect, or improperly paired equipment. Gas pressure doesn't really mean much if you are over temp. Natural gas normally runs at 3.5" water column in the manifold. I have a propane furnace. Propane runs at 10.5"wc in the manifold, but I fire my furnace at 8.5" to achieve the proper temperature rise.

×

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Why do I always have to hit the restart button to make my furnace run


not sure exactly what you have or what button you are pressing but if you have a gas fired furnace and you are pressing the little buttons inside the furnace to get it to run, then you should stop doing that and have a pro come out and inspect it. Furnaces have limits inside them that will trip when they get to hot. In the case of a gas fired furnace a cracked heat exchanger can allow the flame to come outside the firebox, which will trip the limit which is a safety device. Limits only trip if something is wrong. They do not operate in normal operation. A cracked heat exchanger will allow carbon monoxide in the house which can kill you. That is why limits are installed to protect you. if your furnace is over 10 years old this could be the case.

Sep 10, 2014 | Air Conditioners

1 Answer

What is the CO2 % of an 80% efficiency gas furnace and the CO2 % of a 90% gas furnace


Hello,You get between 10%-12% out of each.The efficiency rating difference is the flue gas(exaust) temperature! 90% furnace is much lower temp than any 80%.

Oct 13, 2010 | Air Conditioners

1 Answer

Does drip pan need to cover entire furnace or just coil. I got both answers for repair men.


When you say drip pan are you refering to a pan located under unit in case drain plugs ? If this is what you are talking about and you have a furnace that is 90% efficient or more which will be vented with pvc, it needs to be under the whole furnace as condensate water also comes from furnace when operating and if this drain plugs you will also have water leaking down from furnace. If it is a 80% furnace which will be vented into a chimney then pan needs to be just under a/c

Jun 22, 2010 | Ruud UBHC Air Conditioner

1 Answer

Hi, I have a Carrier Weathermaster XS. I don't


If I am correct, that is a gas furnace, right? I believe it may be between 15 and 20 years. Pro-active with and older gas furnace is never a bad thing. First of all it can become a safety issue, as concerns of heat exchangers cracking and leaking carbon monoxide into the home become increasing. Second, it sure only be 80% efficient, whereas a new condensing furnace today can be up to 95% efficient. That means that you currently only use 80% of the gas you are burning as actual heat transferred into the house via airflow, and the other 20% is literally leaving the house through the flue. So you can increase efficiency dramatically and be safe at the same time by replacing pro-actively

Mar 09, 2010 | Air Conditioners

1 Answer

Extreme heating bills


easy way to fine the high usage is to turn everything off and watch your meter and have someone start turning thing back on and watch for the most usage of power

Jan 25, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

2 Answers

GMPN goodman furnace: Water leaks from the base.


Check the drain tubes inside the furnace. There may be a loose connection or a split tube.
The unit could also leak from the gasket between the secondary heat exchanger and the vent fan housing. The secondary heat exchanger ould also be leaking or cracked.
Hope this helps.
Matt

Jan 08, 2009 | Air Conditioners

1 Answer

I replaced my Janitrol 7 wire thermostat with an RTH7500 which now controls my heatpump system. The switches on the Janitrol were cool - off - heat - Em Heat. Does that mean I have auxiliary heat? There is...


There should be electric heat strips in the airhandler.

They automatically come on when the unit goes into defrost, the thermostat is turned up more than 7 degrees over the indoor temp or if the outdoor temp is just so cold the HP cannot keep up.

Tat is your auxillary or emergency heat.

What does the new t-stats installers booklet say that the 0170 function and #2 #7 options are for?

If it is for gas vs elec heat then set it on the elec option.

The difference is that in gas heat systems the blower comes on a few min AFTER the furnace fires up to allow the heat exchanger to get hot.
In an electric furnace the blower has to come on emediatly because the heat strips get hot emediatly and if the blower is delayed the system will shut of in high temp overload.

Dec 18, 2008 | Air Conditioners

1 Answer

I have a goodman furnace model gmpn 080-4 92% 1997 Gas vave would not open after igniter came on. the voltage was 15 prior to sequence and 26 upon time for gas valve to come on. I ran a jumper from...


general rule is 24 volts to operate control valve. check common at valve to white at valve or out of board. 24 in call, less than 24 when off. sometime s these things back feed or give a false reading. voltage can read say 15 volts but under a load it actually goes away. i have seen a few ac's do this. when connnections get poor you can show voltage but the control does not work the same control applied to voltage elsewhere works> if it works and sequence of operation is correct i wouldn't sweat it. always nice to have two alike so you could check em both and see. but seldom the case. good luck

Dec 05, 2008 | Goodman Air Conditioners

1 Answer

Erratic goodman GMPN 100-4


sound like you have a bad fan motor

Dec 04, 2008 | Goodman CPLE24-1 Air Conditioner

2 Answers

Carrier Weathermaker gas 8000 will not ignite


Your hot surface igniter may be bad. It may be cracked which would prevent it from starting the burner flame.

May 21, 2008 | Air Conditioners

Not finding what you are looking for?
Air Conditioners Logo

Related Topics:

211 people viewed this question

Ask a Question

Usually answered in minutes!

Top Air Conditioners Experts

Dan Webster
Dan Webster

Level 3 Expert

8147 Answers

Bill Long

Level 3 Expert

577 Answers

Tim Whalen

Level 3 Expert

3056 Answers

Are you an Air Conditioner Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...