Carrier RTU second stage freezing up

[qwerty hvac]

Model # 48HJE014x-5006238
Serial # 4309G40674

Get a no cooling call at 4:30 yesterday, find second stage compressor and evap coil frozen solid. I figure low on charge,late in day. So I pull up the recovery machine and all my crap to see what is left in the system and recharge for the weekend. Well I pull out the charge and get 9.2 lbs and stop. Factory change is 9.4 I believe. I let it thaw, dump the charge back in and let it fire up. While I was doing all of this by the way I had first stage running and it cooled off the space. So it runs for about ten minutes then starts freezing. I am thinking a restriction in this stage somewhere. I have numbers out in the truck. Figured I would post this to get some thoughts.

[socotech]

Liquid line drier restriction.

[Six]

That RTU has the manifold with the crimped in metering devices right ? Could be the liquid drier too.

Ive replaced that manifold metering assembly a couple of times because one or two of the met. devices were plugged.

Pull the drier and check it.

[qwerty hvac]

That RTU has the manifold with the crimped in metering devices right ? Could be the liquid drier too.

Ive replaced that manifold metering assembly a couple of times because one or two of the met. devices were plugged.

Pull the drier and check it.

That is what I was leaning towards. I did not take a temp drop across it. One of those days where I just wanted to get home.

[qwerty hvac]

How big of a job is it to pull that manifold? I have not had to do one yet.

[qwerty hvac]

Here are some numbers:

SH 8.5
SC 28.6
High side 199.6
Low Side 48.3
Ambient temp 72.7
Condenser discharge 92.7
Supply temp 41.5
Return temp 67.1
compressor discharge temp 71.8
suction temp 33.1

[qwerty hvac]

Some pics.


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[Six]

How big of a job is it to pull that manifold? I have not had to do one yet.

They're pretty easy actually.

You have to cut the old one out and I then remove the stubs with a torch. It doesnt take a lot of heat and then slide in the new manifold and replace the old drier.

I use 15% and light heat.

Easy peasy japaneasy
.

[Six]

Half a day job.

[qwerty hvac]

They're pretty easy actually.

You have to cut the old one out and I then remove the stubs with a torch. It doesnt take a lot of heat and then slide in the new manifold and replace the old drier.

I use 15% and light heat.

Easy peasy japaneasy
.

Ok sounds not to bad. Will have to pop the top for that..

[timebuilder]

Ok sounds not to bad. Will have to pop the top for that..

Nope.

Flip out the condenser fan and get inside on a set of kneepads. Done a couple that way.

[qwerty hvac]

Nope.

Flip out the condenser fan and get inside on a set of kneepads. Done a couple that way.

I'm 6'5" 300lbs. I don't think I will be crawling in there. Lol


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[Six]

nice set of guages