LG LMU245HV mini split 3 zone heat pump DIY - Page 2

Xringer · 04-05-10, 06:53 PM

Good to see you back Chaaru. Now that summer is coming, you are going to need that system running soon.

Got my Sanyo replacement unit at last and have it running. So far, it's doing well.

Looking forward to more of your posts.

Cheers,
Rich

TMilazzo · 06-22-10, 04:48 PM

Your post about the LG install was a God Send. The LG manual I have does not have any of the neat diagrams you posted. Where did you get the detailed manual you posted?
I am in the process of doing the nitrogen pressure test, and I left the service lines disconnected at the evaporator end to blow out any possible stuff in the lines. I hooked my manifold set to the gas service valve and the liguid service valve. Lines are connected at the condenser end. Did not touch position of service valves, both of which have shrader valves and both service lines have fittings which will depress the shrader stem. When I feed nitrogen, it flows into the liquid line ( and comes out of the disconnected ends) but then nothing will enter the gas lines. I really want to purge the gas lines. Any ideas?
Thanks
Tom

Chaaru · 10-17-10, 07:10 PM

Thought I would come back to update my thread....

Here are some pictures of the tools and equipment I had bought for this project

Vacuum pump

Nitrogen regulator

Vacuum Pump Oil

Nylog Blue

Vacuum Gauge

Condensate drain pipe

Branch Disconnect

Chaaru · 10-17-10, 07:16 PM

Riser Blocks

R-410 Adapter

HVAC Manifold Guage

Condensate Pump

Xringer · 10-17-10, 10:19 PM

Wow!! That equipment looks a little familiar!!

Hook up that manifold, micron gauge and vacuum out the hoses.
I'm wondering how well your hose shut-off valves work.
At high vacuum, mine leaked a tiny bit of air inside, whenever they were operated. (closed).

I think the loss was on the pump side, since that's where the micron gauge
was installed. (which showed the loss).

When the valve was shut, the LCD read-out jumped up a bit,
and then when right down, as the pump was still running.

Chaaru · 10-18-10, 06:26 PM

Yep, you have been my Guru thru my successful install and we had put our setup to good use this past summer.

Everything went as planned. I will post more pictures shortly.

Yep, my readings jumped as well during operation (closing the valves once pump couldn't bring the pressure down any more) which prompted me to do this a couple of times before releasing the R-410A. Your thread was what had inspired me to take on this project and I am glad I completed it without too much trouble.

Xringer · 10-18-10, 07:40 PM

Congratulations! That's great! I hope it works out for you..
Can't wait to see all your pics and a review of a 3-zone Mini-Split..

Mine has been working great, heating up the house during these cool fall months.
I hope it's a mild winter, so I can skip burning any oil at all.. (Just 1/2 gal a day for hot water).

I sealed the little snow roof to the side of my house, so I should get less rain (and snow) dripping
down in back of my outdoor unit. I hate that ice buildup..

I've noticed my Sanyo still has the same old over-revving problem that it used to have.
So, we are being careful not to call for more than 2 degrees of heat at a time..

So, do you have a power use monitor set up yet? So you can brag about
your low heating cost??
We are still amazed that our electric bill is so low.
Some months it's even lower than it used to be, before we installed the Sanyo.

I hope our electric rate stays the same for a few more years..
Based on using less heating oil, the Sanyo is well on it's way to paying for itself.

Cheers,
Rich

AC_Hacker · 10-18-10, 07:56 PM

Quote:

Originally Posted by Xringer

We are still amazed that our electric bill is so low.
Some months it's even lower than it used to be, before we installed the Sanyo.

I've had the same experience with mine.

-AC_Hacker

Xringer · 10-18-10, 08:30 PM

Quote:

Originally Posted by AC_Hacker

I've had the same experience with mine.

-AC_Hacker

It's certainly strange, that we can heat two bedrooms,
living room, dining area/kitchen, bathroom, hallway and the 18'x16' add-on TV den.. Using so little power..

We have been using the Sanyo about every day this month. So far, it's been costing us about 55 cents a day..
That's about 1/3 the cost of the half gallon of oil we burn each day to make hot-water for washing & bathing.

I want my next Sanyo to have a hot-water heater built in!!

TMilazzo · 11-23-10, 12:02 PM

Finished a 3-zone LG mini-split heat pump install late summer. Had some problems (caused by me)which I will share with my next post. Overall, very pleased with performance. Does anyone know where to get a service manual for the LG mini-split? I am more-familiar with Goodman, and they supply excellent manuals, with great troubleshooting guides. The LG manual is marginal in that regard.

06-22-10, 04:48 PM	#12
TMilazzo 50's Redwood in SC Join Date: Jun 2010 Location: Upstate SC Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	LG Mini-split, Final Stages Your post about the LG install was a God Send. The LG manual I have does not have any of the neat diagrams you posted. Where did you get the detailed manual you posted? I am in the process of doing the nitrogen pressure test, and I left the service lines disconnected at the evaporator end to blow out any possible stuff in the lines. I hooked my manifold set to the gas service valve and the liguid service valve. Lines are connected at the condenser end. Did not touch position of service valves, both of which have shrader valves and both service lines have fittings which will depress the shrader stem. When I feed nitrogen, it flows into the liquid line ( and comes out of the disconnected ends) but then nothing will enter the gas lines. I really want to purge the gas lines. Any ideas? Thanks Tom

10-17-10, 10:19 PM	#15
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	familiar!! Wow!! That equipment looks a little familiar!! Hook up that manifold, micron gauge and vacuum out the hoses. I'm wondering how well your hose shut-off valves work. At high vacuum, mine leaked a tiny bit of air inside, whenever they were operated. (closed). I think the loss was on the pump side, since that's where the micron gauge was installed. (which showed the loss). When the valve was shut, the LCD read-out jumped up a bit, and then when right down, as the pump was still running.

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04-05-10, 06:53 PM	#11
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Good to see you back Chaaru. Now that summer is coming, you are going to need that system running soon. Got my Sanyo replacement unit at last and have it running. So far, it's doing well. Looking forward to more of your posts. Cheers, Rich

10-17-10, 07:10 PM	#13
Chaaru Lurking Renovator Join Date: Jan 2010 Posts: 12 Thanks: 0 Thanked 1 Time in 1 Post	Thought I would come back to update my thread.... Here are some pictures of the tools and equipment I had bought for this project Vacuum pump Nitrogen regulator Vacuum Pump Oil Nylog Blue Vacuum Gauge Condensate drain pipe Branch Disconnect

10-17-10, 07:16 PM	#14
Chaaru Lurking Renovator Join Date: Jan 2010 Posts: 12 Thanks: 0 Thanked 1 Time in 1 Post	Riser Blocks R-410 Adapter HVAC Manifold Guage Condensate Pump

10-18-10, 06:26 PM	#16
Chaaru Lurking Renovator Join Date: Jan 2010 Posts: 12 Thanks: 0 Thanked 1 Time in 1 Post	Yep, you have been my Guru thru my successful install and we had put our setup to good use this past summer. Everything went as planned. I will post more pictures shortly. Yep, my readings jumped as well during operation (closing the valves once pump couldn't bring the pressure down any more) which prompted me to do this a couple of times before releasing the R-410A. Your thread was what had inspired me to take on this project and I am glad I completed it without too much trouble.

10-18-10, 07:40 PM	#17
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Congratulations! That's great! I hope it works out for you.. Can't wait to see all your pics and a review of a 3-zone Mini-Split.. Mine has been working great, heating up the house during these cool fall months. I hope it's a mild winter, so I can skip burning any oil at all.. (Just 1/2 gal a day for hot water). I sealed the little snow roof to the side of my house, so I should get less rain (and snow) dripping down in back of my outdoor unit. I hate that ice buildup.. I've noticed my Sanyo still has the same old over-revving problem that it used to have. So, we are being careful not to call for more than 2 degrees of heat at a time.. So, do you have a power use monitor set up yet? So you can brag about your low heating cost?? We are still amazed that our electric bill is so low. Some months it's even lower than it used to be, before we installed the Sanyo. I hope our electric rate stays the same for a few more years.. Based on using less heating oil, the Sanyo is well on it's way to paying for itself. Cheers, Rich

11-23-10, 12:02 PM	#20
TMilazzo 50's Redwood in SC Join Date: Jun 2010 Location: Upstate SC Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts	Finished a 3-zone LG mini-split heat pump install late summer. Had some problems (caused by me)which I will share with my next post. Overall, very pleased with performance. Does anyone know where to get a service manual for the LG mini-split? I am more-familiar with Goodman, and they supply excellent manuals, with great troubleshooting guides. The LG manual is marginal in that regard.