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Quicker Defrost Cycle

Post in 'The Green Room' started by samandlillie, Dec 19, 2010.

  1. samandlillie

    samandlillie Member

    Joined:
    Oct 2, 2007
    Messages:
    57
    My 15 RLQ Fujitsu ductless heat pump,seer of 21 and EER 14.5 operates as low as 5 degrees F(-20 C). However it does go thru the defrost cycle of around 5 min. when it is very damp outside . Any suggestions on how one could speed up the process?Could one use something like electric pipe wrap or some cable . My neighbour has a built in crankcase heater in his UTL outdoor unit and I never see any ice or condensation under the unit. his SEER is 15 and EER is 12. My unit always has ice build up on the ground under the unit. A quick blast of warm air would melt the frost a lot faster.I only run my XXV pellet stove on rare occasions. I have replaced over $1200 of pellets with about $300 of electricity.
    Wayne in NS.

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  2. benjamin

    benjamin Minister of Fire

    Joined:
    Nov 7, 2009
    Messages:
    695
    Loc:
    SW WI
    Whatcha whinin about? I got a brother that's into UFC but I don't mess with any Fujitsu stuff.

    Whether this defrosts with a reversing valve or resistance heater, I doubt you could improve it easily. The only possibility is if you had an alternative heat source, as in ground water. Hook up the defrost timer to turn on a high volume spray nozzle aimed at the coils, heck leave the nozzle on all the time and you've just converted your heat pump to geothermal.
  3. benjamin

    benjamin Minister of Fire

    Joined:
    Nov 7, 2009
    Messages:
    695
    Loc:
    SW WI
    I don't know what UTL is either, but I'd guess the reason that the neighbors unit doesn't have ice under it has a lot to do with the lower efficiency. It's either using more resistance heat in those conditions or it's melting the water away somehow.

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