What type of system do I have? - http://www.hvacmechanic.com/ Forums
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 |  "What type of system do I have?"
, posted Sat 19 Jun 10:43  
I am going to hire a professional to come service my system. I want to get it up to peak efficiency. I want to make sure they use the proper method to determine the correct charge. I saw the following quote:
"A recent EPA-funded study showed that 72% of air conditioners are incorrectly charged. Incorrectly charged air conditioners lead directly to early compressor failure, reduced cooling capacity, reduced comfort, and high utility bills. The average energy savings from using proper charging methods have been estimated at 13%, with many units saving more than 25%."
This would apply to heat pumps as well, right? I have read that the manufacturers have specific proceedures for getting the charge correct. Two proceedures I have heard of are the "Superheat method" for non-TVX systems and "Subcooling" for TVX systems. So my questions are; Is my system TVX or non-TVX? Do you think the findings of the EPA funded study are correct? Would it be reasonable to insist that the HVAC technician use the procedure recommended by the manufacturer? What method does the manufacturer recommend for my system?
Zone 1 - Dual Fuel - Heat Pump/Gas Furnace
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Carrier Weathermaker 9200 Model # 58MXA100-16
Carrier Coil Model # CK5AXA042000AAAA
Trane XE1000 Model # TWR042C100A1
Carrier Thermidistat Model # TSTATCCPRH01-B
Aprilaire Humidifier Model # 560
Trion Electronic Air Cleaner Model # TTMMAXIV1400
Zone 2 - Heat Pump
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Trane Air-Tite Model # TWE037E13F
Trane XE1000 Model # TWR030C100A4
10 kW Auxiliary Heat
Carrier Thermidistat Model # TSTATCCPRH01-B
Trion Electronic Air Cleaner Model # TTMMAXIV1400
Wiring Diagram at http://mysite.verizon.net/vze7ctd5/wires.jpg
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Replies:
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| cesarin78801
|  "Re(1):What type of system do I have?"
, posted Sat 19 Jun 23:41
the EPA is right and i will tell you that an air condition can be over charge or under charge even when the techs are following the manufature's instructions because we miss one little thing.a unit has to be charge under "normal conditions"
i will call "normal" indoor temperature of 72*f - 75*fand 100*F -105* out side temperature.usually when we take a service call by the time we can get to it is already 100*F out side and 95*F-105*F inside this are not normal conditions an air condition should be repaired and pre-charged let it run until it gets very close to normal condition and come back and recheck it and do adjustments if needed.super heat and sub-cool methods are the ones i personally use and prefered to use.
hope it helps you.
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| HVAC Doc
| "Re(1):What type of system do I have?" , posted Sat 19 Jun 11:32:
Your first system is a mix with a 10 seer outdoor unit and your second system is a matched 10 seer system. It is likely to have an orfice (fixed metering device) but there again, hard to tell through the computer screen. To determine if it has a TXV on it, look for a valve on the small refrigerant line just outside the coil. It will have a very small diameter copper tube that runs to a large bulb that is attached to the large suction line. That model of Carrier coil did not come factory installed with a factory installed TXV so it would be outside the case if installed. The same goes for your Trane as the F at the end of the coil model indicates it was shipped with a "Fixed Orfice". Yes a system that is over/under charged with refrigerant will not heat or cool properly and cause things such as excessive run time and compressors running higher than normal amps. Along with having them cleaned, motors lubricated (if not sealed bearings), superheat/sub cooling checked, filters checked, and airflow/temperature drop across the coils should also be checked to determine if the coil is dirty, fan speed is correct, and ductwork is delivering the proper supply/return needed for the system.
[this message was edited by HVAC Doc on Sat 19 Jun 11:33] |
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