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Thread: need quick help

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  1. #1
    Join Date
    Aug 2004
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    Wpg Mb Canada.
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    i have a a/c todo tomorow morning.. it's a millivolt system. what we have is a white rodgers fan relay. i never installed one into a millivolt system before (it's an oil conversion furnace) but i think its fairly straight forward. what im going to do is not touch the millivolt circuit. run my 24v to the RC at the stat. and do everything else as per usual. does this sound retarded? i know im going to have to increase fan speed already..
    anyways if no one replies thats what im gonna do.
    gahh

  2. #2
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    Jan 2004
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    You can use a small rbm relay to isolate the 2 circuits.
    That way you only have 1 t stat.

    Alot of the new oil furnaces use that set up to protect the transformers.
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  3. #3
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    Aug 2004
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    Wpg Mb Canada.
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    ok yes its an old oil furnace that has been converted to gas probably in the 80's. im planing on using just one stat. regularily i put a jumper through rc + rh but.. for whatever reason in the particular aplication i think without that jumper it isolates the two systems. and everything should work koesher?
    gahh

  4. #4
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    As long as the stat doesn't ry to get power from the rh terminal.

    Is the stat battery, or 24 volt powered?
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  5. #5
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    Wpg Mb Canada.
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    battery. this should work right? anything to watch out for?
    gahh

  6. #6
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    If its battery only then your ok.

    Just remmember, to remind them to change the batteries every year when they set their clocks back.

    Prevents no heat calls on christmas.
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  7. #7
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    ok thanks for the re-assurance. gonna go do this.
    gahh

  8. #8
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    Wpg Mb Canada.
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    turns out it was a 24v gas valve anyways. good info for future refrence though. everything went all good
    gahh

  9. #9
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    Glad to hear it went well.

    Next time sell them the new furnace also, they'll thank you when they see their redeuced hating bill.


    Unfortunately not everyone has the money for everything at once.
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  10. #10
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    Aug 2004
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    Wpg Mb Canada.
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    i didnt even look in the blower compartment. heh, i just told him to change the filter before i left. it was filthy. i told him to be aware of the coil icing up because i didnt have any pulley's. also yeah like you said the heating bill will be much greater with umm higher fan speed. hopefully it dosent freeze up with this low fan speed.. if it does i told him i'll come fix it. im not too familiar with super heat and sub cooling calculations. all i know when i left the temp outside was 30 degrees celcius (92'f) an the outside condensor was filthy.. which i told him to clean. and my pressures were.. 80 vapour and 250 liquid?
    gahh

  11. #11
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    80 vapor would normally indicates good to high air flow,(depending on indoor temp) 250 head with a dirty condenser isn't good. After being cleaned it could drop too low, and the evap freeze.

    go to the for your interest forum, and read about superheat, and subcooling.
    Do a search and you will find many post about uit.

    Was todays job a side job?
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  12. #12
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    Aug 2004
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    Wpg Mb Canada.
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    ok yeah i will. the journeymens at my work dont ever dummy things down for me. they talk to me like im journeyman.. im only 20 i should tell them to quit talking over my head and would be able to handle these issues.
    but yeah it was a side job for a buddy. charged him pennies and did most the work myself kind of deal. he had all the equipment. i just was there to quater back.
    gahh

  13. #13
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    Some times it is expected of the apprentice to ask when some thing doesn't make sense, or isn't understood.

    Souldn't be be made to have to ask every day though.

    Now, tell me, would your company hook up a system and let so many things unchecked, or uncorrected?

    He paid you pennies in money, BUY, you had the chance to gain alot of knowledge while doing this job, and passed it up.

    Personsally I'm against employees doing side jobs.

    But, if your going to do one, do it proffesionally!!!
    Not half way.

    Ok, got that out of my system.


    You really should go back and clean the condenser and make sure air flow is proper( that system now has your name on it), just like any install your company would do.




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