Sight Glass Moisture Indicator - HVAC - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 07-07-2009, 01:54 AM   #1
Member
 
Join Date: Jul 2007
Posts: 415
Rewards Points: 278
Default

Sight Glass Moisture Indicator


Hi,

I want to install a sight glass on my heat pump liquid line. Seems like Emerson makes them as well as several other manufactures.

Here is one I can get for 12 bucks delivered:
http://cgi.ebay.com/ebaymotors/ws/eB...EF:MOTORS:1123


Does anyone know much about these? Do they work very well? Should I spend 40 on one rather then 12? What is the take rate on these, do people use them on new installs?

-Jeff

Advertisement

zootjeff is offline   Reply With Quote
Old 07-07-2009, 09:11 AM   #2
Member
 
Join Date: Nov 2008
Posts: 279
Rewards Points: 252
Default

Sight Glass Moisture Indicator


Quote:
Originally Posted by zootjeff View Post
Hi,

I want to install a sight glass on my heat pump liquid line. Seems like Emerson makes them as well as several other manufactures.

Does anyone know much about these? Do they work very well? Should I spend 40 on one rather then 12? What is the take rate on these, do people use them on new installs?

-Jeff
Of the dozen or so of contractors I interviewed, only one said that he installed a sight glass on every installation.

My guess is that he used it to quickly check the charge (bubbles) as he wasn't conversant with such things as static pressure, superheat, sub-cooling.

Needless to say, he didn't get the job.

V

Advertisement

veesubotee is offline   Reply With Quote
Old 07-07-2009, 02:58 PM   #3
Member
 
Join Date: Nov 2008
Location: palm coast fl
Posts: 588
Rewards Points: 500
Default

Sight Glass Moisture Indicator


only works if youre system is equiped with a txv
kennzz05 is offline   Reply With Quote
Old 07-07-2009, 05:22 PM   #4
Member
 
Join Date: Jul 2007
Posts: 415
Rewards Points: 278
Default

Sight Glass Moisture Indicator


Quote:
Originally Posted by kennzz05 View Post
only works if youre system is equiped with a txv
Really? how is a TXV going to affect moisture content?
My system will have one, but that doesn't make sense to me.
zootjeff is offline   Reply With Quote
Old 07-07-2009, 05:32 PM   #5
as seen on tv
 
Join Date: Mar 2009
Location: pa
Posts: 205
Rewards Points: 150
Default

Sight Glass Moisture Indicator


Usually install them on new installs after drier before evap ,moisture indicators can be a helpful troubleshooting tool but not necessary.
qbert is offline   Reply With Quote
Old 07-07-2009, 07:52 PM   #6
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,112
Rewards Points: 862
Default

Sight Glass Moisture Indicator


If you have pulled a proper 500 micron vacuum etc you won't have a moisture problem and need the indicator. Sightglasses can eventually leak freon and I won't use them. On refrigeration systems, Yes. Using superheat/subcool/approach methods and or weighing in the charge is all I use.
yuri is offline   Reply With Quote
Old 07-07-2009, 08:45 PM   #7
Member
 
hvaclover's Avatar
 
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 3,704
Rewards Points: 2,000
Default

Sight Glass Moisture Indicator


Gotta dis agree with you to some degree Yuri.

I put one on a system to day cause i suspected I wasn't getting a full liquid head. I was right right. Needed 1 1/2 lbs of R22 to make it right.

My subcooling and superheat were within one and half degrees of spec and spec called for with +/- two degrees.

My line set was long and in this case the sight glass helped as the TXV could not be adjusted to compensate line set length.
__________________
Just slow, not stupid.
hvaclover is offline   Reply With Quote
Old 07-07-2009, 09:23 PM   #8
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,112
Rewards Points: 862
Default

Sight Glass Moisture Indicator


I agree they can be useful but leave them there long enough and some can leak. I would not want someone not understanding superheat/subcooling etc and only using a sight glass. Good techs understand the fundamentals and not just using shortcuts. Here's one for you. Lots of furnaces nowadays have 3 ton capable blowers but a 1 1/2 ton unit is installed. Do the installers slow down the fan or just charge it on high speed and let it rip. Kind of blows away the logic of the charging tables? I find them left on high from the factory a lot.
yuri is offline   Reply With Quote
Old 07-07-2009, 09:42 PM   #9
Member
 
hvaclover's Avatar
 
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 3,704
Rewards Points: 2,000
Default

Sight Glass Moisture Indicator


Quote:
Originally Posted by yuri View Post
I agree they can be useful but leave them there long enough and some can leak. I would not want someone not understanding superheat/subcooling etc and only using a sight glass. Good techs understand the fundamentals and not just using shortcuts. Here's one for you. Lots of furnaces nowadays have 3 ton capable blowers but a 1 1/2 ton unit is installed. Do the installers slow down the fan or just charge it on high speed and let it rip. Kind of blows away the logic of the charging tables? I find them left on high from the factory a lot.

Yu're 'spossed to change motor speeds??


__________________
Just slow, not stupid.
hvaclover is offline   Reply With Quote
Old 07-07-2009, 09:49 PM   #10
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,112
Rewards Points: 862
Default

Sight Glass Moisture Indicator


Some of these blowers have so much capacity it blows Granny's bedcovers off and freezes the old gal. Not to mention whistling etc. Put er down to red and it works fine.
yuri is offline   Reply With Quote
Old 07-07-2009, 10:33 PM   #11
Newbie
 
Join Date: Jul 2009
Posts: 29
Rewards Points: 25
Default

Sight Glass Moisture Indicator


Quote:
Originally Posted by zootjeff View Post
Really? how is a TXV going to affect moisture content?
My system will have one, but that doesn't make sense to me.
...he means the sight glass can only be used for charging a txv system only , you can't charge a piston or fixed orfice system with a s.g. are you only looking to see the moisture content with this glass??? What is your reason to have this item , as you'll need to perform all the work the other guys have mentioned . it hardly seems worthwhile to do all that is required if you're not coversant with sh , sc , db & wb to properly charge your unit . Please don't take offense at my comments as i don't know your experience level . The way you ask your question makes me wonder....Please be careful with liquid refrigerant
psilliman001 is offline   Reply With Quote
Old 07-08-2009, 02:47 AM   #12
Member
 
Join Date: Jul 2007
Posts: 415
Rewards Points: 278
Default

Sight Glass Moisture Indicator


Quote:
Originally Posted by psilliman001 View Post
...he means the sight glass can only be used for charging a txv system only , you can't charge a piston or fixed orfice system with a s.g. are you only looking to see the moisture content with this glass??? What is your reason to have this item , as you'll need to perform all the work the other guys have mentioned . it hardly seems worthwhile to do all that is required if you're not coversant with sh , sc , db & wb to properly charge your unit . Please don't take offense at my comments as i don't know your experience level . The way you ask your question makes me wonder....Please be careful with liquid refrigerant
I don't plan to install it myself, but I do plan to buy it myself if I do buy it. I've found a guy to do the brazing charging and setup, I was just curious if I should get one of these and how people decide whether or not to get one or not on a brand new Install.

-Jeff
zootjeff is offline   Reply With Quote
Old 07-08-2009, 07:49 AM   #13
Member
 
hvaclover's Avatar
 
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 3,704
Rewards Points: 2,000
Default

Sight Glass Moisture Indicator


Ten bucks says he gets condensation inside the SG and wipes away the moisture indicator.


I know it did me Next one I'm gonna flare.
__________________
Just slow, not stupid.
hvaclover is offline   Reply With Quote
Old 07-08-2009, 01:00 PM   #14
Member
 
Join Date: Jul 2007
Posts: 415
Rewards Points: 278
Default

Sight Glass Moisture Indicator


Quote:
Originally Posted by hvaclover View Post
Ten bucks says he gets condensation inside the SG and wipes away the moisture indicator.


I know it did me Next one I'm gonna flare.

Can you re-phrase that? I have know idea what you just said.
zootjeff is offline   Reply With Quote
Old 07-08-2009, 01:03 PM   #15
Member
 
hvaclover's Avatar
 
Join Date: Oct 2008
Location: Suburbs of Detroit Mi
Posts: 3,704
Rewards Points: 2,000
Default

Sight Glass Moisture Indicator


Quote:
Originally Posted by zootjeff View Post
Can you re-phrase that? I have know idea what you just said.
Sorry. It's the way you have to heat sink the SG or you get condensation on the inside glass.

Advertisement

__________________
Just slow, not stupid.
hvaclover is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Condensation on fiberglass window frame creamaster General DIY Discussions 11 01-05-2012 08:42 PM
Glass on greenhouse roof Flavio Building & Construction 16 07-15-2010 08:37 AM
Impact Windows & French Doors Matty16 Carpentry 6 06-22-2009 10:01 PM
Help with replacing some glass shonkster Building & Construction 5 03-12-2009 06:24 PM
Sweating windows big daddy-o General DIY Discussions 15 01-06-2008 03:41 PM




Top of Page | View New Posts