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  1. #1
    Join Date
    Aug 2004
    Location
    Wpg Mb Canada.
    Posts
    338
    Hi, any help would be great..

    ok so I was at this house earlier with a Ruud Hi efficient. start up furnace.. cb blower runs for 30 seconds then shuts off.. The condensate line coming off the bottom of the termination, was kinked badly in 2 spots. The furnace was running like this for 2 winters now.

    After rolling the hose to get the kinks out, I got the furnace to fire up 3 times but not consecutively. I had condensate coming out the drain line to the sewer. Combustion Blower was making a slight slight gargle. barely noticeble. I was stumpt. cb blower is a bugger to remove..

    Sorry no pics or model number. This is an upflow, Ruud Hi Efficient from 2003. The Hi and Lo pressure switches are both housed in a metal case. I've installed newer Hi efficients and noticed the new switches are housed in plastic.

    Anybody else have trouble with these pressure switches before?? Im currently unemployed.. furnace is under warranty from the company i was previously with. they gave a good friend of mine a good deal so im sure they dont want to waste time servicing it.
    gahh

  2. #2
    Join Date
    May 2000
    Location
    Indianapolis, IN, USA
    Posts
    34,101
    There are 2 switches, vent pressure & blocked drain. And yes, they have been less than reliable

  3. #3
    Join Date
    Jul 2001
    Posts
    3,112
    If you have water in the inducer housing, it can cause the blower to turn slower than normal, effecting the ability to activate the pressure switches. Pull the inducer and pour the water out.

  4. #4
    Join Date
    Jul 2001
    Posts
    3,112
    I read your profile. You may want to find another line of work. You state that fixing other peoples mistakes makes you physically ill, well, welcome to the emergency room. If you run service, you'll find a lot of mistakes so be prepared to be sick a lot.

  5. #5
    Join Date
    Aug 2004
    Location
    Wpg Mb Canada.
    Posts
    338
    troyorr heh yaa

    im becoming accustom to it. i should update my profile. that was written when i was just doing installs.

    hmm vent pressure and blocked drain... i just want to change out the switches.. my digital manometer of course isnt sensitive enough to take a proper report. but i know the pressure is fine. seems when i bang them around i get action.

    its funny because when we were doing keeprites. the replacement switch for the plastic housed was metal.

    makes sense now.
    gahh

  6. #6
    Join Date
    Jul 2001
    Posts
    3,112
    How do you know the pressure is fine? Don't get into the habit thinking you don't need reliable test equipment. There is absolutly no way you know what the pressure (negative and positive) is without a quality gage or meter.All you do when you smack the switch is physically move the diaphram against the micro switch and make temporary contact.

  7. #7

    Thumbs up

    There's a lesson to learn there....listen to him

  8. #8
    Join Date
    Mar 2004
    Location
    Grottoes VA
    Posts
    5,856
    Originally posted by skr0oface
    cb blower is a bugger to remove..

    Hardly

    One of the easiest ones to remove. 4 screws and a molex connector. The housing is only connected with silicone.
    Karst means cave. So, I search for caves.

  9. #9
    Join Date
    Aug 2004
    Location
    Wpg Mb Canada.
    Posts
    338
    thx for the help guys.

    yea i took the pressure switches [both, since their still under warranty. and communicate with eachother] back to the whole saler. the plugged drain [low pressure .40in.wc] had some mineral deposits on the hose fitting. i suspect they were impeding our connection there.

    burners fired up consistently after that.

    i need to pick up some info on pres. switches since there's alot more to them then i thought. sometimes when doing annuals id see the pressure hose tee'd off going to the gas valve.

    anyone can link me to some quality info, that'd be great. i never found any in pro's forum. maybe i wasn't looking hard enough.

    thanks again for the help
    gahh

  10. #10
    Join Date
    Apr 2004
    Posts
    7,680
    Mineral deposits on the hose fitting and you made a claim on two pressure switches that function properly?

    Troyyer is right, you need to have a magnehelic or manaometer if you want to properly diagnose a pressure switch. The switch settings are clearly marked on the switch itself. Ultimately the kinked drain line was the problem because it backed water (and crap) up to the fitting. In hind sight, which I realize is 20/20 you probably should have cleaned the hose and fitting when you found that water was backing up and you would have saved yourself a trip or two.



  11. #11
    Join Date
    Aug 2004
    Location
    Wpg Mb Canada.
    Posts
    338
    yea i dont know the proper procedure for cleaning the innerds of a pressure switch. maybe you could expand on this some, docholiday? Regardless I just feel whats the point in trying to McGiver the switch when its still under warranty? dosent make any sense, i rather have bran new over one who's integrity has been compromised.

    i made a warranty claim on both swtiches yes. one was functioning properly the other was not [as stated above.. furnace was firing intermittently]..


    i understand the pressure switch closes/opens at a set pressure.. i have a testo digital manometer that truth be told, is too shifty to let me know at what pressure the switch is closing on. its def. good on gas valves.
    my ohm meter told me the switches closed within 5 seconds.

    i plan on getting a magnahelix in the near future. any reccomendations? i wanted to hold out until i find an accurate digital magnahelix. doubt that will happen though guess i'll be lugging around the Guage.




    gahh

  12. #12
    Join Date
    Nov 2005
    Location
    Texas
    Posts
    1,628
    Yea, keep taking those good parts back for warranty, and
    next year you will be complaining about parts and equipment
    cost. It's the trickle down effect.

    Parts houses and mfg.s are our allies. We need to be
    diligent with repairs, and only take back, that which has
    indeed failed.

    Just my opinion.

    p.s.
    I don't think doc was referring to the "innerds" of the
    switch, more so the connecting ports and hoses. Cleaning
    a part is not the McGiver approach, making one is.

    Regards.........

  13. #13
    OUCH

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