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so in my 10+ years of installations, the last couple years have had me bewildered with refrigerant leaks in ductless systems. i have worked out alot of bugs throughout my methods, but no matter what...

how would i wire an aprilaire 400 humidifier with the automatic humidistat into an air handler that has a hydronic coil instead of a furnace? the humidistat asks for a W wire which on the air handler...

So the black wire from the ductless gets tied into both safeyy wires?

I do want to follow their instructions. But i dont know what that peice is and it didnt come with the pump. I want to be a good hvac tech!

Has anybody used the omega pack mini pump that goes under the ductless split heads? I was watching the video on how to wire and was wondering what the yellow thing is that he combines the 2 safety...

Do you know a model or part number?

Is there still a thermostat out there that can delay
the fan in a hydronic setup? Instead of using an aquastat? I have used thermostats in the past that had the ability to start the circulator right...

just watched a video on those, thats a great suggestion. is the pump powered by the unit? i think this might be my solution

do the cassettes fit right into the 2x2 grid of the drop cieling? obviously it would have to be hung somehow additionally. are they much more expensive than a typical head?

A rtu would be easier in a normal situation but the jobsite is a bit messy. The company is a government funded adult daycare/school and they tried to renovate it themselves without a real gc. They...

i am about to install 7 ductless splits in a commercial office space. i plan on using typical wall mount heads with condensers on the roof. the problem is that this space has no exterior walls for me...

Awesome thanks!

I have a customer requiring a 2.5 ton change out. The problem is that they have very limited space on the side of the house. They park a boat trailer next to the condenser, and as it is the trailer...

ahh that makes sense. so its really only saving a little bit of space against the wall by snugging up to the ceiling.

so who has experience with the ceiling mounted ductless systems? I have a customer with who's basement is all mirror walls and a sheetrock ceiling. Ive never installed a ceiling mount before and im...

thanks! I resolved the problem with a new board and a new fan motor as per fujitsu tech hotline. unit is up and running

i have a customer with a 5 year old 9k ductless single zone system that I did not install. in cooling mode, the indoor unit blows air but the outdoor unit is not running. I put it on heat mode and...

yes its really tight and "moist" to work on these. I couldn't find the high side port. I thought maybe its like a ductless and didn't have one

thanks for the info. I don't see a match for the scenario I gave. I do not think this will work.

sounds like what the homeowner expected

a friend of mine has a boat with an r22 water cooled air conditioning system. i took a look at it for her because it never seems to cool the boat off and its always running, i don't know anything...

I have a customer with a multizone (3 zone) fujitsu ductless system. currently he has 1 18k head and 1 7k head coming from the 24k condenser. the condenser "appears" to be able to handle 1 more unit,...

I was under the impression that a shot of refrigerant mixed with nitro is allowed to be used to check for leaks. The sniffer will still pick up that little bit of refrigerent mixed in

Okay so im not crazy. Thanks for the tips! I'll pump from both sides and give it a few minutes to settle.

Hmm you make a good point. I usually only use the high side because im so used to the old 22 guages that only go up to like 120 psi on the low side.

Ive realized that when i crank up a new system with nitrogen to test for leaks, it will drop about 50 lbs on the side i pump it into and raise on the other side before staying put. Ive been told...

The propane tank most likely isnt treated on the inside like a real recovery tank is. So it could rust and contaminate any gas you plan on trying to recover. Just try to find a used recovery tank....

Wow im surprised. Does it matter how many turns the lineset takes around corners? The room is probably 600 sq feet with only a 12k head by the way. So i think its under powered to begin with.

i have a customer with a fujitsu 3 zone ductless system. theres a 12k head in the basement, a 12k in the living room, and a 9k in a bedroom. the living room head is very far from the condenser and...

so i guess i cant use solid 14/4 like i normally do? Doesnt really make a difference to me. I'll do whatever it calls for.

Whats the "electrical" difference between solid and stranded wire? Why...

ive done a lot of ductless installs, mostly trane and comfort aire. all of the times they use a 14/4 wire from the condenser to the head that acts as power and communication between the two (no low...

it was definitely an unusual situation but I did have another tech with me when I returned to get a another set of eyes on it. the tech I was with is very experienced and still scratched his head at...

you were exactly right. I had the baseboard circulator and the a/c on the same stat. that was 1 problem which I resolved with a better stat. I still ohmed out the stat wire and found a short there,...

I saw 2 old ones behind the unit afterwards

Ok. What are the other possibilties?

I could only assume its the stat wire

How do i do that?

http://imagizer.imageshack.us/v2/150x100q90/538/hPxxcj.jpg

Got to a call with a typical split that wasnt doing anything. Had no voltage at the stat, so i checked the transformer. No voltage there either. So i figured it needed a new transformer and i threw a...

I may just put a delay on make timer for the fan and compressor. Itll delay it no matter heat or cold.

Im pretty sure its a single transformer (only 24v supply is from air handler) so even if the second fan wire backfeeds to the heat relay, wouldnt it still need the other leg to activate the rh relay...

Could i just put the green (fan relay) onto the w (heat relay) of the stat? And keep the original fan relay for cooling?

There is a/c on the system i didnt even think about that. This is more complicated now

I just installed a rheem 2.5 ton air handler with a hot water coil. I started it up without an aquastat because normally i just use the thermostat to delay the fan. I wired it with a cheap stat that...

that's a good idea I will keep that in mind for future swaps

thanks for the replies. I am as weary as you guys that I will need an adapter curb. the first York distributor told me it wont need one. I contacted another distributor and they assured me again that...

im replacing a 3 ton York/luxaire rtu with another 3 ton luxaire rtu unit. I have had very little help from York and im wondering if I will need an adapter curb or of I can just place the new unit...

Beleive me i was kicking myself for not checking the codes. If the heat exchange was cracked i would cry about being on a freezing cold roof and change it.

I am an install tech just breaking into service and i have a carrier small rooftop thats throwing me for a loop. Customer states its blowing cold air. Got on the roof and sure enough the burners are...

Very true. I didnt even think about the automotive 134a cans. As for the permits, people do work without permits all the time. But your right they usually get jammed up and we fix it.