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  1. Replies
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    Glad to hear they are making some inroads in your...

    Glad to hear they are making some inroads in your area. Too bad you are not in Eastern Ontario.

    When we put our Zuba in, there were just two others in our area, both also just being installed. ...
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    Yes, you are right about Zuba being Canada only....

    Yes, you are right about Zuba being Canada only. Problem is that heat pumps, and especially the Zuba are also not very common up here either. Even for the guys that installed it, it was their first...
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    84 reads and no responses? What did I do...

    84 reads and no responses? What did I do wrong:oops:

    Maybe too much info?

    OK - What do you pros do when called to check out a heat pump installation before cooling or heating season?
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    Mtisubishi Zuba - Service Call?

    We have had our Mitsubishi in for about 2 years. Just about to enter our 3rd heating season. It also runs for a couple of months in summer.

    Performance appears as good as when first installed. I...
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    I have been offered a window a/c - not meant for...

    I have been offered a window a/c - not meant for sliders, but I can probably add a removable plywood cover on the inside of the window frame to support it. It will have to be removed in the winter...
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    Just a follow up observation. Today in...

    Just a follow up observation.

    Today in Ontario, Canada, we have a very hot day for us. Low 90s. With tstat set at 74F, the a/c is running more often.

    When outdoor temperature was low 80s, a/c...
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    Thanks for the replies. The knee walls are...

    Thanks for the replies.

    The knee walls are already quite well insulated. Only additional insulation we could add would be by adding 1" foam board on inside of walls (which could be done). Up to...
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    We now have it that way. Not much improvement in...

    We now have it that way. Not much improvement in temperature, but feels better due to air movement. Going to try different register that we already have with more open area to try and direct air more...
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    We have two temperature sensors which the...

    We have two temperature sensors which the thermostat averages. Both are on main floor where alll rooms are located except for attic bedroom. We could add a third sensor in the attic room, but then...
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    Sun out this afternoon. One outdoor thermometer...

    Sun out this afternoon. One outdoor thermometer say 80F, other says 84F. Attic where air handler is - 102F (roof faces South and no shading). House still at 74F. Attic Bedroom 83F. Measured...
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    Thanks for comments There are wing walls...

    Thanks for comments



    There are wing walls about 4 ft high on each side that are exposed to the attic. They are 2x4 walls insulated with F/G batts and then covered on attic side with 1" foil...
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    Attic Bedroom hot - Any suggestions?

    Our home is mainly on single level but we have one attic bedroom served by a stairway.

    We have a 3 ton central heat pump with insulated ducts running through attic space to most rooms. We have...
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    849

    I discussed this with Mitsu rep and he said it...

    I discussed this with Mitsu rep and he said it could be unit running and opening valve for short while so as to return oil to compressor after a period or running at low load.

    But today I happened...
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    From discussions with rep today , it seems fan...

    From discussions with rep today , it seems fan behaviour is likely normal, but will confirm with tech guy on Monday. System is cooling very well even in recent very hot weather. Before heating...
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    Well I did say in my first sentence that that was...

    Well I did say in my first sentence that that was what I was doing. In fact the Mitsu distributor's engineer will be here tomorrow.

    My secondary question about the fan was just because I don't...
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    Ok thanks. I will try and get someone to come and...

    Ok thanks. I will try and get someone to come and look at it.

    It was just installed new last Fall, so should not have leaked. Installation still under warranty.

    ADDED: Just a thought - could...
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    A/C sometimes runs for very short time

    We have a Mitsubishi Zuba heat pump. Approx 3ton. Consists of Mitsu outdoor unit married to ADP air handler and controlled by Honeywell VisionPro tstat.

    The system works well for both heating and...
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    I think I have this straight now. I could set...

    I think I have this straight now.

    I could set the HP at 60F and leave it on. Average outside temperature might be 23F for Feb/March. So delta of 37F.

    If we use BB heaters, we would set them at...
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    OK thanks - My dealer says it doesn't draw much...

    OK thanks - My dealer says it doesn't draw much if power is left on, but I don't know just how much "not much" is! But similar "Mr. Slim" outdoor unit only uses 39 watts for crankcase heater.

    If I...
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    Yup - You can't SET the outdoor temperature ;)

    Yup - You can't SET the outdoor temperature ;)
  21. Replies
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    Thanks. I had sent an email out this evening to...

    Thanks. I had sent an email out this evening to Mitsubishi and amazingly they answered right away. They said that recommended lo setting was 17C (63F).

    That seems high, and would mean that we...
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    Lowest Thermostat setting for heat pump

    We are in Canada, and go away for a couple of months during the winter. In past, we had just electric baseboard heating, but we now have a central Mitsubishi Zuba heat pump.

    Outdoor temperatures...
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    No way man! You want me to destroy my system and...

    No way man! You want me to destroy my system and start again:gah:

    Joking aside, I have posted details of our duct layout in other threads - It was properly designed initially (for 2.5ton a/c) and...
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    Happy Birthday! And thanks for all the help.

    Happy Birthday! And thanks for all the help.
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    I am puzzled why ductboard & flex is not used...

    I am puzzled why ductboard & flex is not used much here. It sounds like the right thing for our job. Maybe climate, rodents? I will check it out.
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