Original message
| SMB
 |  "Carrier metering device???"
, posted Tue 26 Jun 16:41  
what kind of metering device is used in the carriers that go directly into evap manifold. ive been noticing more and more carrier units with high head pressures that powerwashing wont take care of. driers are new in some cases, condenser fans working to potential clean straight fins, 350 head pressure. i dont understand what they use as a metering device and that is probably in some way the problem.
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Replies:
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| ciactechhelp
| "Re(1):Carrier metering device???" , posted Sat 14 Jul 19:02
If your unit has the fan in the rear and the fans draws the air into the coil and then exits @ the top, sides and back of the unit,(Models 48 or 50SS, SX, HX) a 320 pound pressure is not uncommon. These are from 1.5 to 5 tons only. If you have the traditional type of unit from 3 to 25 ton models,(models 48 or 50 TF,TJ, HJ, HQ, etc), then that pressure is a little high. The metering devices that are located inside each one of the feeder tubes into the evap coil are fixed orifices called Accutrols. Their location can be identified by a very small dimple in each one of the feeder tubes,close to the joint just before the tube sheet. If any of these are plugged the entire feeder tube assembly can be bought from Carrier. You can also cut each one of those out and install a TXV with a distributor that has the same number of circuits. IF the system has ever suffered a burn-out some blockage may have occured. The other issue that could contribute is that either electrolysis or some type of corrosion may be causing the heat transfer in the cond. coil to be affected. I have noticed that most newer coils, from most manufacturers, because of the more "wavy"air flow path and louvered fin design, they can actually become worse with power washing.
Alex M
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| radhvac
| "Re(1):Carrier metering device???" , posted Fri 13 Jul 15:10
If you are familiar with the piston that Carrier uses on alot of their reidential equipment, that is basically what these are. There are multiple "fixed" pistons in the liquid line at the evap coil. You can tell where they are by looking for a rolled line in the copper.
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| uncle elmo
| "Re(1):Carrier metering device???" , posted Tue 26 Jun 20:34
Not to insult your experience but is the refrigerant R22 or 410A?
410A will run 350 lb head.
buy one get one free
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| | SMB
| "Re(2):Carrier metering device???" , posted Wed 27 Jun 07:47
r22
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| SMB
| "Re(1):Carrier metering device???" , posted Tue 26 Jun 18:30
im talking about 3.5 ton to 7.5 ton rooftop with a liquid line running directly into the evap manifold
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| | marchvac
| "Re(2):Carrier metering device???" , posted Thu 5 Jul 22:26
not sure whitch unit you are working on but alot of the rooftops that i have had high head pressure on and pressure washed i had to split the condenser to clean in between. Even after condenser clean and pressure wash. Lennox and train i had same problem.
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| | dot
| "Re(2):Carrier metering device???" , posted Wed 27 Jun 07:57
I believe the metering devices are in each distributor line that goes into evaporator. look for icing on certain lines for restriction
dot
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| | kalining
| "Re(3):Carrier metering device???" , posted Wed 4 Jul 12:49
Typical Carrier. I've seen residential 1 1/2 ton units run
350 - 400 head. Normal. Even window shakers. I know of only one
Carrier dealer up here. None of us install or recommend Carrier.
The main warehouse pulled out of this city. No sales.
kalining
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| | Freezone12
| "Re(4):Carrier metering device???" , posted Sun 15 Jul 19:00
ditto.....
I am a partner in a mechanical contracting company here in the Dallas/Ft.Worth area with sales in the 75 million dollar arena each year, and we quit selling carrier equipment 'a few years ago......'
too bad. they used to have good stuff.
_______________________________________
If it don't fit
force it.
If it breaks
it needed to be replaced anyways.
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