Original message
| JOHNNYB
 |  "FREEZERS"
, posted Sun 28 May 22:43  
HELP WHAT THE HECK IVE BEEN DOING THIS ALNG TIME BUT IM REALLY GETTING WHIPPED BAD. TWO FREEZERS ACTUALLY THREE SINCE I TOLD THE CUSTOMER TO GET A NEW ONE AND THEY DID. THEESE ARE ALL ONE DOOR STAND UP REACH IN FREEZERS. THEY AL HAVE RSC43CE COPELAND HERMETTIC COMPRESSORS . THEY TWO I'M WORKING ON HAD CAP TUBES. I REPLACED THE CAP TUBE IN ONE. I HAVE A 4TH ONE THAT I HAV E HAD TO REPLACE THE CAP TUBES ABOUT EVERY 1.5 YEARS AND IT FIXES IT. THEY ARE AL R 404A . I HAVE REPLACED THE CAP TUBES WITH TXVS AND ADDED SIGHT GLASS AND A LRGER AND LONGER LIQUID LINE TO SERVE AS A RECIEVER. ONE HAS A CRANK CASE PRESSURE REG AND IT IS SET AT 28PSIG. IM SURE THE EVAP PRESSURE IS HIGHER SINCE THE SUCTION ALWAYS READS 28. I USED THE TINY ACCUMULATOR FOR THE TXV BULB LOCATIION THINKING THAT IT IS JUST AN EXTENSION OF THE COIL (SORTA). THE SYSTEMS WORK BETTER : HEAD PRESSURE IS AT 250 PSIG, AMPS ARE AT RATING, CONDENSERS ARE CLEAN AND THE AIR IS NOT HOT COMING FROM THEM, COMPRESSOR RUNS NICE AND COOL, ENTIRE EVAP FROSTS AND EVENTUALLY ALL OF THE SUCTION LINE ALSO , BUT THEY JUST WONT COME DOWN TO ZERO. ONE HAS A BRAND NEW COMPRESSOR. THEY GET TO WARM DURING LUNCH TIME. THEY USE THEM TO STORE FRIES IN JUST BEFORE THEY COOK THEY FRIES. THE ONE THAT DOE NOT HAVE THE CCAXE REG AND STILL HAS THE OLD COMPRESSOR KEEPS THE PRODUCT SATISFACTORY BUT NOT ZERO. THE OTHER ONE WONT COME BELOW ABOUT 20 DEGREES. PLEASE SEND ANY AND ALL IDEAS. THANKS , JOHN
JOHNNYB
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Replies:
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| JOHNNYB
| "Re(1):FREEZERS" , posted Fri 9 Jun 23:51
UPDATE FROM INQUIRER JOHNNYB ONE WAS FIXED BY INSTALLING THE CORRECT EVAPORATOR FAN BLADE!!!!
JOHNNYB
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| | kilowatt
| "Re(2):FREEZERS" , posted Tue 20 Jun 00:07
replacing cap-tubes with expansion valves ,is a smart response,did your supplier cross reference with proper size exp. valve ? is the charge in the power element of same referigerant/ what is your super-heat ? what-about defrost sequence ?
lorenzopower
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| | Freezone12
| "Re(2):FREEZERS" , posted Sun 18 Jun 19:04
at 28 psig your 404A is evaporating at about -6*f. my experience has been you will lose 10* transmitting thru the coils before you start picking up heat which is giving you a +4 degree evaporator temperature. you need to bring down your evaporator saturated suction temperature to -20* or so, which is 15-18 psig suction. you'll never get a zero degree box at 28 psig with 404A.
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If it don't fit
force it.
If it breaks
it needed to be replaced anyways.
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