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I have seen this situation numerous times in the past. Most often caused by filthy loop water. Some brilliant sole decides to remove the screen from the circuit setter and the coil fills with mud...

What's the problem?? That looks like it is up to code!! Lol! ;)

I have been scolded for my reply to this post because I don't have the * by my name. So I will go through the proper channels before I post anything else here. Sorry Mods!!

With the information you gave it seems to me that your units were barely cooling the room well enough to begin with. If the room was opened to the Plenum above the ceiling your units can't handle the...

I have one that has 404a. This one is about 12 years old.

Just a tip. I have had great luck cleaning them out with dry nitrogen. It seems to get the job done most of the time.
(rcac101) Will they be independent or wired through a fire alarm?

I agree. I service 2 walk in coolers and 2 walk in freezers. Two run r12 and two r22. All have defrost timers. If the cooler was installed charged and left alone it probably would be fine. As soon as...

Some older units and even new ones have ammonia in the system. I've also seen the slight vapor while pulling a vacuum on an r22 unit. I've asked some more techs and no one has gotten nauseous from it.

I'm not sure about this, but I will do some checking around and try to post back pretty quick. This makes me very curious as well.

This one is priceless! Lol.:D

I've used hvac buddy. It is nice to have because you can put in the info and save it. I usually would just try to remember all the numbers and forget something. Lol.

Fluke179 for my main. I also have some very good craftsman meters.

That has to be the best defrost job ever!:D

Looks like it is straight from the factory!:)

I think I would have a look at the txv also. Some come adjustable and if someone has already been in the unit they may have played around with the adjustment.

We have 2 on all of our ceiling heat pumps mounted just above the drop ceiling. It really depends on the application I guess. Ours seem to work well for the most part. The buck stops with your boss...

I'm using a Dewalt 20 volt Max with lithium ion batteries. The impact and regular drill are both great.

In my experience with True unit doors, the doors themselves are flimsy. With that said, the seals are only as good as the door. With little use the doors are bent and flex too much! Good luck with...

Does this unit have a hot gas bypass valve? If so check to see if it is leaking through while in a freeze cycle. You can feel the front and back side of the valve to check the temp. Hot on back cool...

I guess they are lucky they weren't electrocuted to death. Someone stealing ac's aren't thinking right. Even if they know what their doing there is a chance they could steel their last!

Do you happen to have a sight glass installed? I'm surprised your box temp is 12 with that superheat.

Well I guess I need to introduce myself like everyone else. I started out in a Large company that I will leave undisclosed. When I say Large I mean 2 buildings one 5 floors and the other 4 floors,...

Y'all seem to have covered most everything. Do you know if this compressor runs pretty cool to the touch? Does it have an internal relief valve? Check to see if it is dumping refrigerant into the...

I have a unit very similar to the one you describe except mine is a water cooled unit. This problem has shown up with my unit in the past and was the freeze stat. I'm betting yours has a freeze stat...

Hi all. I'm new to the forum but not to hvac. I just purchased an extech rh355 and familiarizing myself to it. It seems to be a very good unit so far. Thanks for any replies!