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Thread: Equalizer's Position
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28-02-2002, 09:26 PM #1
Equalizer's Position
As we know the location of sensing bulb of T.E.V is very important.It must be in good thermal contact with the evaporator outlet and followed by the external equalizer tube.Always in the refrigeration field and in the technical books that (from the evaporator outlet)we found the sensing bulb and then the equalizer tube but and specialy in the FRIGHA BHON evaporators I found that the equalizer is located in the midlle of the collector.My question is what the purpose for thet specialy position of the equalizer adobted by the frigha-bohn.
N.B for 17 years I work in refrigeration air conditioning field( instalation+maintenance+reparation)I prefer to have firgha -bhon evaporators because they are good designed.befor I asked the frigha-bhon distrutors I didn't get the answer.
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28-02-2002, 09:49 PM #2I found that the equalizer is located in the midlle of the collector.My question is what the purpose for thet specialy position of the equalizer adobted by the frigha-bohn.
Why would one connect the equalizer line to the suction header? Convenience most likely...Prof Sporlan
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28-02-2002, 11:18 PM #3Originally posted by Prof Sporlan
Why would one connect the equalizer line to the suction header?
Of course the manufacturer isn't going to stub out 12" from his cabinet and locate the eq. connection.... The crating would cost too much (not to mention the copper).
What is the net affect of the "upstream" pressure connection on valve operation/coil feeding? Is it merely the heat transference from the "warm" valve body to the evaporator outlet? Should the field techs be cutting the factory connections out (after they are reminded of the application) and properly locate such facility?
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01-03-2002, 01:09 AM #4
Equalizer lines are located after the TXV bulb because small amounts of liquid refrigerant can (and often will) leak past the seals into the equalizer line.
This liquid, if it contacts the bulb, can effect it's operation, destabilizing the coil. If the equalizer line is after the bulb however, it will merely result in minor de-superheating.
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04-03-2002, 10:06 PM #5Originally posted by herefishy
Should the field techs be cutting the factory connections out (after they are reminded of the application) and properly locate such facility?
thanks for help
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04-03-2002, 11:53 PM #6Originally posted by ben chaib
i was always traying to have the right reason
Referencing Gary's note regarding liquid bypassing through the eq. seals; Would a properly located TEV sensing bulb, downstream, at 4 or 8 o'clock (if applicable in regard to line size) in such an "UN-by-the-the-book" scenario make re-piping the OEM configuration worth the while?
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05-03-2002, 04:08 AM #7WHERE'S THE PROFESSOR?!!!!!!!!!!!!!!!!!!!!
Referencing Gary's note regarding liquid bypassing through the eq. seals; Would a properly located TEV sensing bulb, downstream, at 4 or 8 o'clock (if applicable in regard to line size) in such an "UN-by-the-the-book" scenario make re-piping the OEM configuration worth the while?
That said, it is still a good idea to locate the equalizer line downstream of the sensing bulb. The old tried and true methods still have a place in modern refrigeration...Prof Sporlan
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06-04-2002, 03:28 PM #8
RECENTLY I GET THE ANSWER FROM THE FRIGHA- BOHN . IT IS AN INSTALLATION INSTRUCTIONS DATA SHEET.
FROM THE FRIGHA-BOHN:
(EXTERNAL EQULIZER.
THE EXTERNAL EQUALIZER LINE SHOULD BE MOUNTED BETWEEN THE SUPPLIED VALVE FITTING AND THE SUCTION LINE,NEAR THE UNIT OUTLET. A 1/4" TUBE BRAZED TO THE COIL HEADER IS SUPPLIED FOR THAT PURPOSE.
NOTE:WITH THE MODERN HIGH QUALITY EXPANSION VALVES,THE SMALL REFRIGERANT LEAKAGE THROUGH THE EQUALIZER LINE IS AT A MINIMUM AND THE VALVE OPERATION IS NOT AFFECTED.THUS ,THE EXTERNALEQUALIZER CONNECTION COULD BE EITHER UPSTREAM OR DOWNSTREAM OF THE BULBE.)
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06-04-2002, 03:36 PM #9
There you go. In dference to the professor and Friga Bohn, I have only seen the sort of bypassing that would cause trouble in rare instances.... and I suspect they were all over heated balance port valves.
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06-04-2002, 04:49 PM #10
Call me old fashioned, but I try to avoid rare instances.
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