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munchkin promblems

clammy
clammy Member Posts: 3,094
This munchkin is a t80 unit and it has the vision 1 controller enable and has been running for about 2 months with out a promblem i followed htp piping diagrams and had no promblems i purged all the piping which is all new copper and baseboard the indirect tank is working fine and still contuines to .The promblem is the unit will not operate for heat .I went there last nite check the display and there are no error codes except the out door sensor is reading 100 ? why i don't know .I flushed the unit and back flushed it and re started the unit and she went right back on line working fine modulating up to temp all was normalthen about 3 hours later i was called again i'm heading there again today to further investagate it .I'm kinda at a lose all piping was clean and new i,m not a over fluxer or to much solder guy and the system was purgered and as i though clean .My thoughs are that the heat exchanger in the munchkin is partilly clogged the indirect tank is still working fine with a taco 0010 other then this last little hitch the unit has performed excellnt for the past 2 months .The ho has been great through it all since i did all of the mech in his home gas ,water and heat lines plus a radiant loop for a garage any input would be helpfull i was planning to put some boiler cleaning product to help remove any flux debris that may be causing this promblem thanks again for any input peace clammy
R.A. Calmbacher L.L.C. HVAC
NJ Master HVAC Lic.
Mahwah, NJ
Specializing in steam and hydronic heating

Comments

  • clammy
    clammy Member Posts: 3,094
    water quality

    This job is supplied with city water so it's not much of a water quality promblem since supposely our water quality is supposely quite good and others i know have installed these units with no water quality issues in my water depts area but i'll have to find out thanks peace clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating
  • paul lessard_3
    paul lessard_3 Member Posts: 186
    try a new outdoor sensor

    I had the same thing happen a while back.

    To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"
  • Darin Cook_3
    Darin Cook_3 Member Posts: 389
    Clammy

    For right now, disconnect one leg of the outdoor sensor and see if that makes the boiler fire up. Make sure the outdoor sensor wire is not close to any line voltage wires. If it is you will get screwed up readings like that 100 degree one. I do not think you have a flow issue. Also make sure all the leads from the Vision control are pushed in the appropriate place all the way on the 925 board. In the future, check out the Grundfos 15-58 FC pump. Three speeds which go up to the equivalent of a Taco 0010. This one pump will cover you all the way up to a Munchkin 140. Check out the price diff you will be pleasantly surprised, plus you get a built in flow check. If you do want to get serious about some hydronic water treatment, check out the products from RHOMAR water treatment. We are just getting into this ourselves. George Hunt is the guy to talk to. By the way, Do you have the software and laptop computer to plug it into the 925 board and see the run process in realtime? If you do any number of Munchkins out there it is very nice to have. Good Luck.







    Darin
  • Ted_9
    Ted_9 Member Posts: 1,718


    Like Darin said. Dissconnect the out door sensor and the unit will fire up at high temp.. Since you have radiant you cant leave it in high temp mode, but at least you can see if its a sensor issue.

    I recently had this happen to me http://forums.invision.net/Thread.cfm?CFApp=2&Thread_ID=21086&mc=5


    Its not the same but check all of you wiring. Call HTP Monday morning.
    PATRIOT HEATING & COOLING, INC.
  • .
    . Member Posts: 80


    Seems like you found the problem yourself but don't know it! If it thinks the outdoor temp is 100, it is in Warm Weather Shutdown and will not run.

    As others have said, disconnecting the outdoor sensor will eliminate this problem. There won't be any outdoor reset, but you can set a low fixed temperature in the Munchkin so it is OK for radiant. You can measure sensor resistance with a multimeter and see if it is correct. There is a chart of resistance vs temperature in one of the manuals.
  • clammy
    clammy Member Posts: 3,094
    Thanks

    Thanks for the responce went there early this morn and at last it was the out door sensor wasn,t near high voltage but was giving a incorrect temp thanks again also any thoughts on a hydronic cleaning solution to run through the system thanks again clammy
    R.A. Calmbacher L.L.C. HVAC
    NJ Master HVAC Lic.
    Mahwah, NJ
    Specializing in steam and hydronic heating
  • munchkin-man
    munchkin-man Member Posts: 247
    Like they say disconnect the sensor and see if it solves the

    issue and if it dose replace the sensor. If for some reason it reacures let tech support know and we will make arrangements to get you a new control. 800-232-9651 go to 2 and you will be in tech support group
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