i'm stumped on this one. fired up a new furnace. before doing any checks on it as i was still running some heat runs. new home construction.i noticed that the furnace wasnt producing any water.so i rechecked the slope of the venting which was fine made sure furnace was level which it was.i know its suppose to slope toward the front but that makes everything look crooked. so i do my gas reading find its under fired. i correct this and do my temp rise reading. which is in spec it was 43 degrees. but im getting a loud gurgling sound coming from the drain. the furnace drain is 3/4 pvc which goes to 3/4 ipex drain. that ipex then goes to floor drain. its at the floor drain you hear the loud gurgling sound it echos through this drain. is it possible they put the wrong venter motor on this furnace and its to strong of a push. furnace is a 50'000 concord 90%. i know this is going to result in a call back as soon as the house is occupied so i'm trying to figure this pain in the arse out. any help would be great ty
Is this a single stage or two stage furnace? Upflow or horizontal? How badly was it underfired? What was the manifold reading?
I think that model has the big plastic P trap in the blower cabinet. Disconnect the tubing from the collector box and fill it with water. It sounds like the ptrap should be primed. Once it fills with water the noise should stop.
Fill your collector box with water so that the hose from your ventor motor is summerged and the gurgling will stop
upflow install. trying to remember manifold reading i think it was just under 3 i havent been out there in a week or so its a stock house not sold yet so next time i head out that way i'll add more water its not gurgling at the furnace its gurgling in the floor drain furnace runs smooth builder relocated the furnace from drawings and the ipex is about 10 ft away.pvc drain from furnace. drains into ipex plumbing pipe which then drains into floor drain under concrete floor.manifold reading on standby was 10.5 / with furnace running i think i had 7wc incoming and to the burners i had under 3wc then corrected it to 3.5wc. think its time for a digital manometer. counting those little hash marks are getting tougher as i get older and my eye sight gets weaker not to mention i forgot my glasses that day lol.
forgot to tell you it was a single stage
Sounds like everything is good. It's probably not cold enough outside to be condensing. Look at getting a TPi 620 manometer.
i think your trap is dry try adding water to it and does the furnace drain tie into the condensate line and is there a humidifyer???
furnace still gurgled the house was recently bought and to get rid of the problem the builder put a rubber plug gizmo in the floor drain they dont do the seal trap primer anymore so that solved that problem and like i said it wasnt gurgling at the furnce it was in the floor drain where the water drained from the furnace.