I've been working with an online provider for a new dual Mitsubishi mini-split ductless system, ceiling cassettes, but having doubts about how the ceiling cassettes manage vertical condensation lines. I've read the MLZ-KP12NA installation manual and I'm aware that there is supposed to be a 1/100 downward drain line. The problem is my particular install:
Modular home with one half of the home has a standard gable roof (pitch is 4/12), the other half of the home was added on (making this a double-wide) with a sloping 3/12 sloping roof that connects to the eave of the first half. Over the entire home is a huge snow roof with at least 12' to the peak when standing on the home. There is a ton of room to walk around up there. One contractor offered to do a full HVAC install with dual air handlers and would attach all the duct work to the snow roof cross-trusses. I've been waiting and waiting for their ductless mini-split proposal and finally gave up as they can't seem to respond.
What I need to know is if this will work with a mini-split ductless system:
My idea was to run the connecting lines from the ceiling cassettes vertical 5' or 6' straight up from the cassette, attaching them to the snow roof lower support trusses, then a horizontal run of 35' (max distance, farthest room) to the roof edge, then down to the heat pump on the north side of the home. This would only be done on the lower home half (probably 3 cassettes), the upper half would have the lines run straight up from the cassettes and down over the edge through the soffits to the heat pump.
I've been told that with a cassette condensation pump this will work - but will it really? Or will this just create problems (sooner or later)? Nothing in the installation manual for this cassette indicates that this can be done (that I've seen). I've not found anything online either if this is actually doable and am hesitant that the dealer is just trying to make a sale.
I could also just lay the lines directly on the roof, but there would still be a 3 ft rise as the line stretched from the cassette location, over the peak of the gable roof, then down to the soffit, then vertical drop to the heat pump. The only difference here would be the total rise in height would be less, and a slightly shorter lines.
I'm confused about how the condensation lines are apparently intended to be run out the wall at a slight downward drop - versus my idea to run the lines up and over the gable roof.
If this is not workable, can somebody weigh in and set me straight? Thank you in advance. It's a large purchase (whole home system) and before I pull the trigger, I need to know if this is going to work.
If it helps, we need more heating here then cooling (currently use a wood stove 5 months a year) with only a few weeks of really hot weather. I don't know what this means for condensation, home has all new windows and average insulation. The lower half has R30 in the roof, and upper half has blown in ceiling insulation, no idea the R value. We're trying to get away from our wood stove, it's literally killing my back now (spinal stenosis) having to cut and split wood every year. Our goal is to get in a system that is done right and works without problems.
Modular home with one half of the home has a standard gable roof (pitch is 4/12), the other half of the home was added on (making this a double-wide) with a sloping 3/12 sloping roof that connects to the eave of the first half. Over the entire home is a huge snow roof with at least 12' to the peak when standing on the home. There is a ton of room to walk around up there. One contractor offered to do a full HVAC install with dual air handlers and would attach all the duct work to the snow roof cross-trusses. I've been waiting and waiting for their ductless mini-split proposal and finally gave up as they can't seem to respond.
What I need to know is if this will work with a mini-split ductless system:
My idea was to run the connecting lines from the ceiling cassettes vertical 5' or 6' straight up from the cassette, attaching them to the snow roof lower support trusses, then a horizontal run of 35' (max distance, farthest room) to the roof edge, then down to the heat pump on the north side of the home. This would only be done on the lower home half (probably 3 cassettes), the upper half would have the lines run straight up from the cassettes and down over the edge through the soffits to the heat pump.
I've been told that with a cassette condensation pump this will work - but will it really? Or will this just create problems (sooner or later)? Nothing in the installation manual for this cassette indicates that this can be done (that I've seen). I've not found anything online either if this is actually doable and am hesitant that the dealer is just trying to make a sale.
I could also just lay the lines directly on the roof, but there would still be a 3 ft rise as the line stretched from the cassette location, over the peak of the gable roof, then down to the soffit, then vertical drop to the heat pump. The only difference here would be the total rise in height would be less, and a slightly shorter lines.
I'm confused about how the condensation lines are apparently intended to be run out the wall at a slight downward drop - versus my idea to run the lines up and over the gable roof.
If this is not workable, can somebody weigh in and set me straight? Thank you in advance. It's a large purchase (whole home system) and before I pull the trigger, I need to know if this is going to work.
If it helps, we need more heating here then cooling (currently use a wood stove 5 months a year) with only a few weeks of really hot weather. I don't know what this means for condensation, home has all new windows and average insulation. The lower half has R30 in the roof, and upper half has blown in ceiling insulation, no idea the R value. We're trying to get away from our wood stove, it's literally killing my back now (spinal stenosis) having to cut and split wood every year. Our goal is to get in a system that is done right and works without problems.
source https://hvac-talk.com/vbb/threads/2228533-Mitsubishi-Cassette-Drain-Height?goto=newpost
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