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  1. The filters are at the heat pump above the drop...

    The filters are at the heat pump above the drop ceiling in my bathroom. HVAC guys change them 3 times a year as part of the PM contract for the building. They are standard filters. Not sure of the...
  2. Very useful!! So by using all there of your...

    Very useful!! So by using all there of your suggestions, and my rough guessing of size I get

    Supply ducts 1 to 1.5 tons, using return I get 2.8 tons but I could be off on that number.
    ...
  3. I have ducted return. This is actually a...

    I have ducted return. This is actually a different apartment. :-)

    There are two ducted returns. I should measure when I get home but I would guess 14 X 20" each.
  4. There are 8 total. 3 are rectangular wall type...

    There are 8 total.
    3 are rectangular wall type (1 in each bedroom, one in living room) Size about 18" wide by 6" high
    3 are ceiling type that blow air in 3 directions (bathroom, entry way, and...
  5. Thanks again. Installer just told me he would...

    Thanks again.

    Installer just told me he would take the 3 ton since I am getting it for free. I guess bigger really is better. :-) He also reminded me I could have duct work problems going to a...
  6. From what I can tell. It's brick on the outside....

    From what I can tell. It's brick on the outside. Then there is that pink foam board stuff (I can see it when I did some drywall work. Then there is a metal stud wall with insulation. I believe...
  7. One other thing. I guessed at R19...

    One other thing.

    I guessed at R19 insulation. I can't imagine it's worse than that for a brick and cement building built in Vermont. It seems well insulated. For example the heat might run in...
  8. I was afraid of leaving the entire roof area...

    I was afraid of leaving the entire roof area completely blank. :-) As you said, it didn't change change much when I took it out. I just checked.

    Everything points to a 1.5 ton unit so I...
  9. Ohhh. That makes sense. No change in air temp...

    Ohhh. That makes sense. No change in air temp with outdoor temp compared to Air sourced heat pump.

    Low volume air would be nice!! When my 3 ton turns on I feel like I am in a clothes dryer. I...
  10. Nope, nothing. Water sourced heat pump with...

    Nope, nothing. Water sourced heat pump with building loop. Building loop is heated by boiler and cooled by tower.

    Something I am a little bit confused about. Will a smaller heat pump provide...
  11. Still waiting for the contractor to get back to...

    Still waiting for the contractor to get back to me about doing a load calc. I am not sure they know how to do it. The lowest option they gave me was 2 tons but I think that is still too large. I...
  12. I know. I asked him if the same 1400 soft was a...

    I know. I asked him if the same 1400 soft was a house with 20 ft high windows facing North would he also say 3 tons. He said yes. So his answer was to take me from 3 tons to 2.5 tons to get longer...
  13. I put in R56 for Floor and Ceilings. I measured...

    I put in R56 for Floor and Ceilings. I measured all the other walls, measured windows and estimated R values. Even if I reduce R values, change outdoor temps to be worse -20F winter, 90F summer......
  14. 1400 Sqft cement conttruction condo Load Calc

    Well, some of you man have been reading my other post. Basically, I am getting a new heat pump under warranty. Mammoth really stands behind their product!!

    I have a 1400 sq ft. apartment, cement...
  15. Mammoth is replacing the entire unit for free. ...

    Mammoth is replacing the entire unit for free. They are also paying the full labor charge!! I am very happy that Mammoth is standing behind their product! Now, to get the size correct. I'll start...
  16. I don't know the brand of compressor. I know...

    I don't know the brand of compressor. I know it's a scroll but that probably doesn't say much.

    The charge was only played with on the original heat pump, this new one (June this year) hasn't been...
  17. Yes, I am very glad Mammoth is standing by their...

    Yes, I am very glad Mammoth is standing by their product!! Makes me feel much better. The latest is, since it appears the balloons deflated upon vac, they want to change the water coil only. The...
  18. Update: Installer was here all day. I called...

    Update:

    Installer was here all day. I called Mammoth engineer on phone and we went through a lot of measurements that took up the entire day.

    1. Td water loop pointed to adequate water...
  19. Think I found it. :-) Just spoke to...

    Think I found it. :-)

    Just spoke to engineer at Mammoth He said delta T should be 10 to 12 degrees in both heating and cooling modes. Heating mode above, shows only 7 degree delta T.

    It...
  20. OH. Thanks. I just got a few names. The closest...

    OH. Thanks. I just got a few names. The closest one is a few hours from here though. I wonder how far they travel.
  21. Exactly. I was really not running the unit until...

    Exactly. I was really not running the unit until it's fixed but I am starting to think I should run it so that it gets worse and they can really fix it. I only run it when I am home and it never...
  22. Apparently we are now waiting for a new low...

    Apparently we are now waiting for a new low pressure switch to be installed. I did turn the heat on the other morning and it is running about 20 degrees (barely) temperature rise when measured from...
  23. Please tell. :-)

    Please tell. :-)
  24. I bumped into the installer for my building. ...

    I bumped into the installer for my building. There is no Glycol in our loop. :-(

    Also, he said they are sending us a new low pressure switch. We believe it is going to be lower cut off. ...
  25. Anti-freeze is my wording. :-) I thought that...

    Anti-freeze is my wording. :-) I thought that was the purpose of Glycol. After a Google search maybe that's not the case. ha

    Anyway, he just said it was a water loop. I know he said something...
  26. Thanks Beenthere. Nice to have confirmation they...

    Thanks Beenthere. Nice to have confirmation they are on the right track to get this thing fixed. I am a little concerned that he has to open up the system and re charge but I guess there is no...
  27. Found something else. I am confused now. I...

    Found something else. I am confused now.

    I am reading the schematic for the heat pump and it clearly slows the low pressure switch and it says 90 PSI cut in, and 100 PSI cut out. I interpret...
  28. Ok Here is what I have. Thanks for looking at...

    Ok Here is what I have. Thanks for looking at this. These are hand written on the Check-out Sheet which is part of the manual. I type fast so I'll just type them in.

    Mammoth D036HH0...
  29. Well. Out of 74 total units (building built in...

    Well. Out of 74 total units (building built in 1997) about 1/3 of them have been changed. I have no idea what the original ones were. Over the last couple years they were using Mammoth as...
  30. Beenthere. Isn't 27 bad since that is below...

    Beenthere. Isn't 27 bad since that is below freezing?? I REALLY wish I could measure it. Nobody has measured it other than to say it's 70 in winter time. :-( Apparently they keep it 70 winter...
  31. More info. Apparently Mammoth has gotten back...

    More info.

    Apparently Mammoth has gotten back to my installer. The engineers are saying the wrong low pressure switch is installed in the unit. I think you guys might be able to give me your...
  32. I just went up to the heat pump and felt the...

    I just went up to the heat pump and felt the lines going to, and coming from the heat pump. They felt cool. Not cold, not hot. I wish I had a way to measure the temp.

    I took some pics of the...
  33. Yes, I own my condo. I got a contact person at...

    Yes, I own my condo. I got a contact person at Mammoth but I can't get through to him. His voicemail is full and the operator also goes to voicemail. These guys are under contract for the...
  34. The saga continues. Looks like now Mammoth wants...

    The saga continues. Looks like now Mammoth wants to pay to have the HVAC guys remove the heat pump (take down drop ceiling, disconnect) and change "a part in the refrigeration loop". I am guessing...
  35. I just shut off the heater because it got too...

    I just shut off the heater because it got too warm in here Thermostat says 72 at the moment and 29 degrees outside. I did have the oven on a few hours ago though. Also, I am sure my 600 watt 42"...
  36. Well the 1500 watt heater is now lacking a little...

    Well the 1500 watt heater is now lacking a little bit. It was in the low 20's last night with wind. It now has a hard time getting things up to 70 degrees after a few hours of running.

    I...
  37. Well, assuming it does get down to negative...

    Well, assuming it does get down to negative temps... -20 F and wind. Perhaps a bit more than 1/2 ton ;-)

    I did a quick on-line load calc and got 1 ton with my estimates and design temps for my...
  38. Haven't used the heat pump at all. I find...

    Haven't used the heat pump at all. I find running the 1500 watt electric heater for about an hour can keep the apartment at 72... or warmer depending how long I leave it on.

    I turn the fan only...
  39. It's not just this company. My last building was...

    It's not just this company. My last building was straight AC and water loop boiler. Each apartment had an AC compressor on the roof (25 units). That contractor was no better. I was on the condo...
  40. It's a cooling tower and a boiler system. It...

    It's a cooling tower and a boiler system. It automatically switches over to mantain the loop temperature. I figured that was a normal way to do it. I have no clue.

    I do know that a few...
  41. Absolutely. The apartment really does stay warm ...

    Absolutely. The apartment really does stay warm The oven will raise the temp a few degrees and the 1500 watt electric heater has been able to keep the entire apartment at 72 with out issues. I do...
  42. Well I promptly heard from the rep in Albany. He...

    Well I promptly heard from the rep in Albany. He told me he has been working with my installer and Mammoth to get a factory guy to fly out to work on my heat pump. So it looks like they are working...
  43. I have decided to leave the heat pump off by the...

    I have decided to leave the heat pump off by the way. I will buy an large electric heater for this weekends cold snap. I am sure I can put up with the cold since it's an apartment and stays fairly...
  44. Hi Guys, Just noticed all this feedback!! ...

    Hi Guys,

    Just noticed all this feedback!! Thanks! I have been making calls this morning but not getting anywhere. My closest rep according to the Mammoth webpage is 3 hours away in Albany. I...
  45. Thanks. I have the property management involved...

    Thanks. I have the property management involved now to help out.

    Since this is the second heat pump that had very similar issues (low heat mode pressure) I asked the tech a few times about the...
  46. Running water sourced heat pump with low pressure switch disabled. OK or bad??

    I live in an apartment with a water sourced heat pump. After a lot of debug time the first heat pump was a year old when it was replaced under warranty (I paid labor to instal).

    This heat pump...
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    Hate to have to bring this thread up again!!! ...

    Hate to have to bring this thread up again!!!

    My heat pump was changed in June last year. I paid labor unit was warranty. It ran in cooling all summer no issues whatsoever. I recently...
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    If it doesn't get replaced, I'll give them one...

    If it doesn't get replaced, I'll give them one more try. They have been very good to me so far. Have only charged me for one service visit even though they have been to my place a bunch of times. ...
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    I am afraid I am back again. The companies are...

    I am afraid I am back again. The companies are arguing about replacing the heatpump. Not sure what will happen. I am not sure the HVAC guys can do diagnostic work. They simply check pressures,...
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    Thanks. It will be good to have this behind me!!...

    Thanks. It will be good to have this behind me!!

    One more question. It seems the heatpump has 3 fan settings. My current one was left on high... I think they just leave them on high upon...
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