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  1. #1
    Join Date
    Oct 2008
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    Daikin twin not ramping up on heating



    Chaps

    got a 4kw twin split 2012.

    both indoors run on cooling as normal. but on heating the unit will only ramp up to 240psig and hence no real heat effect

    The refrigerant charge is correct so I'm thinking it's possibly sensor ?

    suggestions etc

    richard
    (not always sunny Tenerife)



  2. #2
    Join Date
    Oct 2003
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    Re: Daikin twin not ramping up on heating

    Hi Richard,

    Can this help?
    http://www.refrigeration-engineer.co...not-ramping-up

    Peter (This morning everything covered with snow and -3C)

    PS: Is your back healed again?
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  3. #3
    Join Date
    Dec 2008
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    Re: Daikin twin not ramping up on heating

    Make and model please might give us a little more of a clue.
    Mobile A/C at its best, see avatar.

  4. #4
    Join Date
    Oct 2001
    Location
    Nottingham UK
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    Re: Daikin twin not ramping up on heating

    Hi Richard

    It could be the indoor coil sensor or the outdoor discharge thermistor out of calibration.

    In cooling mode, the indoor sensor is used for freeze up protection, but in heating, it is used for holding off the indoor fan until the coil temp is above 34C to prevent cold draughts. In the meantime, the compressor will hang back waiting for the indoor signal to ramp up.

    If the compressor discharge thermistor is reading incorrectly then the unit will prevent the compressor ramping up due to discharge protection control.
    Attached Files Attached Files
    I'm back on the Pale

  5. #5
    Join Date
    Oct 2003
    Location
    Belgium
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    Re: Daikin twin not ramping up on heating

    With this free app from Daikin, you can find the resistance values
    Without this app, I can't service a VRV :-)
    https://play.google.com/store/apps/d...n.aircon&hl=nl
    It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.

  6. #6
    Join Date
    Oct 2008
    Location
    newbury
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    Re: Daikin twin not ramping up on heating

    Returned to site today.
    Thought I'd go through a run again before pulling it apart.. As you'd expect both indoor units ramped up to full heating. 45 minutes later everything worked as normal

    Left alone till the next time it fails

    Thanks to all.

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