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Viessman boiler and airflow plus not heating home

Jamie995
Jamie995 Member Posts: 13

Good day everybody we have a veissman vitodens 200 boiler system and a veissman airflow plus when we set the house temperature from the thermostat to 20° and the house is at 18°, it will cycle on and off multiple times and sometimes we'll stay on for an hour it will only heat the house maybe half a degree within those 2 hours this is very annoying because we live in a cold climate and have to light on our fireplace for most of the heat we've had a technician come out and take a look and replace a circulating pump and a few fuses and he said everything was good is there anything we could do to get more heat through the air exchanger as this is an expensive unit and it's really annoying to not be able to properly heat our home

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Comments

  • GroundUp
    GroundUp Member Posts: 2,336

    What are the water temps during all phases of this "warm-up"? Does the air handler cycle off, or the boiler, or both? Nobody can answer without more information, but if there is a call for heat, the system should never shut down.

    Jamie995
  • Jamie995
    Jamie995 Member Posts: 13

    Hey, our dhw temp is set to 45°. It's the air handler that cycles on and off not the boiler. I'm not to knowledgable about the system as it was installed already when we bought the house. For an example, thermostat is set to 20° overnight, Incan hear the air going throughout the house for hours and incheck the house temp and it'll be 19°. The air coming through the vents is mildy warm.

  • neilc
    neilc Member Posts: 3,019

    do you have hot heating pipes coming out of the boiler? and 10 15 feet away? (too hot to touch?)

    what about at the air handler? hot in and out?

    can you post pictures showing both?

    any controls at the airhandler? aquastat? its settings?

    known to beat dead horses
  • GroundUp
    GroundUp Member Posts: 2,336

    I was asking about the boiler water temps, not the domestic water. If the boiler stays running and making heat while the air handler stops during a call for heat, there is a control or flow issue somewhere. There may be a temp sensor somewhere which turns off the fan if water temp falls below a certain point, which may be a control issue (too low of a water temp) or may be a flow issue.

  • Jamie995
    Jamie995 Member Posts: 13

    The pipe our if the boiler is really hot and the pipe for our dhw is super hot. Pipe for the air exchanger is warm but not hot

  • Jamie995
    Jamie995 Member Posts: 13

    As I am typing this air exchanger is blowing lukewarm air, pipe to air exchanger is warm not hot

  • Jamie995
    Jamie995 Member Posts: 13

    Would this be on the boiler side? I'm just confused because the tech who installed this system 7 years ago is the tech that we've called multiple times about this and keeps saying everything is working fine. But we keep having these problems

  • neilc
    neilc Member Posts: 3,019

    is this a new problem, or have you been chasing it for years ?

    sounds like you don't have good circulation to air handler,

    the circ itself, or maybe air bound to or at the coil from the circ change

    can you draw on your boiler picture which lines and circ go to AH ?

    any means to vent air at AH ?

    is that vent open above circs? (right og boiler)

    what system pressure do you have ?

    known to beat dead horses
    Jamie995
  • Jamie995
    Jamie995 Member Posts: 13

    Those pipes go to the air handler and the bottom circulation pump is the one the tech replaced 3 days ago. All vents are open. I'm not fully sure what you mean by vent air at the air handler pressure is at 14 psi. Which is in the green zone

  • LRCCBJ
    LRCCBJ Member Posts: 1,001

    Is it possible that the air handler is fed by one of the two circulators at the very top of the picture? If this is not correct, can you advise which piping is feeding the air handler?

  • neilc
    neilc Member Posts: 3,019

    air vents on the heating water system, to vent air at the AH,

    has this worked properly in the past?

    I don't think I see a circulator to send water to the AH,

    known to beat dead horses
  • neilc
    neilc Member Posts: 3,019

    or is that the 2nd circ from the bottom going to AH ?

    known to beat dead horses
  • neilc
    neilc Member Posts: 3,019

    that 2nd circ may have caught air when the bottom was changed

    known to beat dead horses
  • neilc
    neilc Member Posts: 3,019
    known to beat dead horses
  • LRCCBJ
    LRCCBJ Member Posts: 1,001
    edited January 18

    Your sketch cannot be correct. That red line must go THROUGH the mixing valve and over to one of the two circulators. It doesn't go past the circulators.

  • LRCCBJ
    LRCCBJ Member Posts: 1,001
    edited January 18

    There are four vertical copper lines to the right of the boiler that go all the way to the ceiling. My suspicion is that lines 3 and 4 (from the left) go the air handler. These lines avoid the mixing valve. However, I don't see a pump for those lines?

  • Jamie995
    Jamie995 Member Posts: 13

    Hi the top two circulators go to the basement flooring and garage flooring. I'm no expert but the technician said those bottom ones do the water and air handler

  • Jamie995
    Jamie995 Member Posts: 13

    I believe one of the bottom circulators goes to the ah, and we have only been in this house for one year, but don't recall having heating issues last winter. We do live in the prairies where it gets -30° if that means anything

  • LRCCBJ
    LRCCBJ Member Posts: 1,001

    OK, it appears that the second circulator from the bottom does the air handler………..provided it does NOT do the hot water.

    If this is correct, be sure the handler is calling, and put your hand on the very first vertical pipe to the right of the boiler. It should be blazing hot. The second circulator from the bottom NEEDS to be running!

  • neilc
    neilc Member Posts: 3,019
    edited January 18

    bottom circ clearly goes to the hydraulic separator and rest of heating system, is that air vent openon separator ?

    the 2nd circ up goes up to ceiling, and I'm guessing to AH, nope, wired to switch that says Domestic,

    is AH down here in basement, or up in attic?

    known to beat dead horses
  • Jamie995
    Jamie995 Member Posts: 13

    Air handler is in the basement 8ft from the boiler

  • Jamie995
    Jamie995 Member Posts: 13

    Yes the first vertical pipe is not touchable hot, this one goes to the hot water. The pipes to the ah are warm not hot, I feel the circulators and they are hot and a slight vibration

  • LRCCBJ
    LRCCBJ Member Posts: 1,001

    OK, it is confirmed that lines 3 and 4 going vertical feed the air handler. WHERE IS THE CIRCULATOR? Neither of the circulators on the bottom have anything to do with the air handler. One is the primary pump and the other feeds the DHW.

    You cannot get much flow to the air handler without a circulator!!

  • neilc
    neilc Member Posts: 3,019

    has the AH ever worked well?

    I don't see a circ to send water to AH,

    known to beat dead horses
  • neilc
    neilc Member Posts: 3,019

    try this,

    turn off switch for Domestic, and shut those 2 valves at ceiling,

    shut off everything else above separator, power and valves,

    maybe this will force flow to AH, and release air, all water air vents stay open,

    give that 10 minutes,

    did you get any air releases? go 10 minutes more,

    when air stops, then reopen and repower all that you shut

    known to beat dead horses
  • LRCCBJ
    LRCCBJ Member Posts: 1,001

    Time for a new "tech". You'll not get this fixed without adding a circulator for the air handler. This is basic.

  • Kaos
    Kaos Member Posts: 570

    Usually these air handlers have a built in circ.

    Grallert
  • LRCCBJ
    LRCCBJ Member Posts: 1,001

    Maybe that is the problem! The "tech" changed the wrong circ!!

  • neilc
    neilc Member Posts: 3,019

    Durable composite circulator pump which is less susceptible to water quality issues.

    Viessmann AirflowPLUS hydronic air handler | Viessmann CA

    ut oh

    known to beat dead horses
  • neilc
    neilc Member Posts: 3,019

    has to be an air vent there somewhere

    wider view at AH

    known to beat dead horses
    LRCCBJ
  • LRCCBJ
    LRCCBJ Member Posts: 1,001

    Yep, that's where the pump is hiding. Now, it begs the question why it is NOT working??

  • neilc
    neilc Member Posts: 3,019
    known to beat dead horses
  • neilc
    neilc Member Posts: 3,019

    air locked from replacing the boiler pump many pictures up

    known to beat dead horses
  • LRCCBJ
    LRCCBJ Member Posts: 1,001
    edited January 18

    Could be………..but, the problem has persisted for years……………..and, if the primary pump was NG, nothing in the house would get sufficient heat other than the DHW.

  • neilc
    neilc Member Posts: 3,019

    I'm not sure OP said for years, only been there for last winter

    known to beat dead horses
  • neilc
    neilc Member Posts: 3,019
    known to beat dead horses
  • neilc
    neilc Member Posts: 3,019

    so @Jamie995 , why was that bottom circ changed out?

    known to beat dead horses

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