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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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    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...
  23. Replies
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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...
  24. Replies
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    Happy Birthday! And thanks for all the help.

    Happy Birthday! And thanks for all the help.
  25. Replies
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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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    Thanks for all the input guys. Sounds like a...

    Thanks for all the input guys.

    Sounds like a lined plenum and transition take offs is the way to go. Contractor will figure out details. We may have to enlarge or drop end of plenum to line up...
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    Thanks - You seem to have become my consultant...

    Thanks - You seem to have become my consultant here ;)

    Just a few clarifications:

    - acoustic guy suggested 19x19 with 1" liner, so still 17x17 on inside.
    - 17x17 is what ADP said we needed to...
  28. Replies
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    Plenum Design

    Some of you may recall earlier posts about noise we are getting through ducts with our newly installed Heat Pump. (used primarily for heating).

    One problem was identified here as bad design of...
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    350-450CFM/ton rule

    In the manual for our heat pump air handler it says not to go below 350CFM for COOLING. It doesn't say anything about Heating.

    I guess in both cases, we are trying to transfer teh same amount of...
  30. Replies
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    Well, I think I feel a bit better now about that...

    Well, I think I feel a bit better now about that 1000CFM setting!
  31. Replies
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    Beentere and Genduct -

    I think I now understand how the ECM controls mass flow! Good learning exercise!

    The jumpers on the board used to determine the mass flow set point are given in CFM (600/800/1000/1200)! For CFM to...
  32. Replies
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    Yes I am aware of that - It seems that when...

    Yes I am aware of that - It seems that when thermostat requests a big change (say 63 to 70F), compressor must go to max and then we get teh high supply air temperature. That is reason for this...
  33. Replies
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    Fans capacities and curves are usually in CFM...

    Fans capacities and curves are usually in CFM without any conditions specified, so I presume CFM means ActualCFM.

    But then they measure rpm and load (which I would think would be related to mass...
  34. Replies
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    Yes - That is it. As you probably know, a Canada...

    Yes - That is it. As you probably know, a Canada only model (so far)
  35. Replies
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    No, no strip heaters or other aux heat. The 118F...

    No, no strip heaters or other aux heat. The 118F supply temp is strictly from the heat pump. Don't know what refrigerant would be at, but would that be near max pressure?
  36. Replies
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    I just ran a test - Bumped set point up from 69F...

    I just ran a test - Bumped set point up from 69F to 72F. AHU exit temperature increased to 115.3F when return reached 72F (43.3 delta). Outdoor temp is 36.5F. At 36.5F outdoors, rated capacity of...
  37. Replies
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    We don't have any aux heat in this unit. Back...

    We don't have any aux heat in this unit.

    Back to question - Is 118F (+/- 2F) supply air at AHU exit excessive for an R-410 heat pump?
  38. Replies
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    Thanks - I did some more reading and see how they...

    Thanks - I did some more reading and see how they could do that.

    Because the control is all done based on blower, presumably the CFM figure is at the heated air temperature (for a draw through...
  39. Replies
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    The Mitsubishi/ADP system is AHRI rated to put...

    The Mitsubishi/ADP system is AHRI rated to put out 38000 btu/hr. (see attached chart which was apparently based on 1200cfm).

    I can test heating capacity but need to know flow. That is partly...
  40. Replies
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    Question about ECM motor and AHU

    Our Mitsubishi heat pump uses an ADP AHU (BVRMB6230S) with variable speed motor. Literature says it maintains set CFM over wide range of esps.

    I was wondering how it does that. It does not appear...
  41. Replies
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    First of all, I have been retired for 8 years and...

    First of all, I have been retired for 8 years and never worked on chilled water systems! It just happens programmer asked me to check out latest release of his hydraulics program, so tried it on my...
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    I took some type of cold pill instead - now...

    I took some type of cold pill instead - now feeling better.

    I found that I could add OBDs to existing grilles, but they barely fit in boots and restrict flow. On side entry ones, they block the...
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    Our registers are new. (They are not Really...

    Our registers are new. (They are not Really registers - no dampers, but I will call them that anyway ;).) They are aluminum with double deflection, individually adjustable airfoil shaped plastic...
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    Heh Heh. Not scared, just would rather have...

    Heh Heh. Not scared, just would rather have someone else do the major work. I should have done more thinking before we went ahead with the Heat Pump. I assumed the installers knew a lot more than I...
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    Message was cut off, but you are right - no...

    Message was cut off, but you are right - no turning vanes in the bull-head Tee. Contractor re-used the old A/C tee.

    I think that if I want to reduce noise, enlarging and lining the supply...
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    I definitely don't try repairing my HVAC system...

    I definitely don't try repairing my HVAC system (or my car's A/C!). But being an engineer (retired), technical stuff including duct design (in industry) is not new to me. But now, I don't get paid to...
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    The return seems fine from noise viewpoint. Just...

    The return seems fine from noise viewpoint. Just some noise and drafts due to Filter Grille (~450fpm) which is in our breakfast room. That is why I am considering having an additional return...
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    If only there was a simple solution:confused:. We...

    If only there was a simple solution:confused:. We were led to believe that our existing ducts were adequate for the new heat pump & handler. And to be fair, the velocities and pressure losses through...
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    You ask a lot of good questions. No, the...

    You ask a lot of good questions.

    No, the system has not been balanced. Only dampers on this 1970 vintage U shaped supply ductwork are on initial tee from handler. Original registers had built in...
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    I used 240cfm/sq.ft., not 240cfm. This was based...

    I used 240cfm/sq.ft., not 240cfm. This was based on having equal flow of 120 cfm through each of the ten 0.5 sq.ft. registers. Face velocity 240fpm.

    It was the second chart Fig 3 that I had...
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