Original message
| comfortairtech
 |  "Freezer Service nightmare!"
, posted Thu 22 Jun 21:54  
Service on walkin freezer. Small walkin freezer 6'x 6'x 8', Copelematic 1 HP compressor, R410-A refrigerant.
Day 1-Start components shorted and
two pole disconnect switch failure. Installed new start components and switch. Noted-Compressor noisy but system cooling.
Day 2-Compressor locked up. Installed new compressor. Noted high
head pressure and little or no liquid through sight glass.
Day 3-Install new expansion valve through recommendation of Sid Harvey supplier. Expansion valve is flow through type, pressure limiting with external equalizer. Super heat not low enough to supply proper cooling to system or compressor. Temperature on suction line near compresssor was 65*f and evaporator coil loops not cool to touch or sweating.
The original expansion valve was an Alco model
AAE3/4ASW35
6D
GT5797-5
Any insight would be appreciated!
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Replies:
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| fitter597
| "Re(1):Freezer Service nightmare!" , posted Fri 23 Jun 00:41
What are your head and suction pressures?
LOCAL 597 PIPEFITTERS
"We Do It Right The First Time"
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| | comfortairtech
| "Re(2):Freezer Service nightmare!" , posted Fri 23 Jun 09:30
Head pressure: 240 psi
Suction presssure: 20 psi
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| | fitter597
| "Re(3):Freezer Service nightmare!" , posted Fri 23 Jun 21:14
your coil is starving, check that txv again and make sure it's the right one and it's adjusted properly, try to back it out all the way.
LOCAL 597 PIPEFITTERS
"We Do It Right The First Time"
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| gas1
| "Re(1):Freezer Service nightmare!" , posted Thu 22 Jun 22:31
check equalizer tube stopped up
sure R410 not R404
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| | comfortairtech
| "Re(2):Freezer Service nightmare!" , posted Thu 22 Jun 23:16
Correction: Refrigerant 404A. Will pumpdown unit and check external equalizer tube
Thanks, Bill
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