T ECH CHA L L ENGE Ad Index BY DI CK SHAW
Adrian Steel
www.adriansteel.com/landing/acca 37
Ally
www.allylending.com/hvac
Share this challenge with your entire staff and see who can fi gure out the diagnosis fi rst.
A frozen food case utilizing R-404A with a TXV metering device (and receiver) has a customer complaint of “warm case.” The symptoms at the store confi rm that the case is 20 degrees warmer than normal, and the condensing unit is running continuously. What are the “possible causes” (note: there is only one problem intended) with the following measured conditions on this fi eld service check sheet?
FIELD SERVICE CHECK SHEET Compressor Discharge Temp.
Condensing Press./Temp. Condensing Outlet Temp. Condenser Subcooling Condenser Split
Entering Feed Device Temp. Evaporator Press./Temp. Evaporator Outlet Temp. Evaporator Superheat Compressor Inlet Temp. Total S. H.
Ambient Temp. Room/Box Temp. Compressor Volts
Compressor Amp. Draw
Carrier
www.carriervrf.com
Copeland 35 13 2 (Inside Front Cover)
ECI – Thermogrid
www.thermogrid.com
Federated Insurance
www.federatedinsurance.com/ association-groups/acca
225 deg. F.
187 psig / 84 deg. F. 81 deg. F. 3 deg. F. 14 deg. F. 78 deg. F.
15 psig / -22 deg. F. 12 deg. F. 32 deg. F. 48 deg. F. 54 deg. F. 70 deg. F. 20 deg. F. 240 V. Low
27
11
Hudson Technologies
www.hudsontech.com 15
Midea
www.mideaevox.com
Center Spread 20 & 21
Mitsubishi
www.discover.mitsubishicomfort.com/ contractors
29
Pearl
www.pearlcertifi
cation.com/ACCA 23
Resideo
www.resideo.com/proiq
39 (Inside Back Cover)
Rheem
www.Rheem.com/Endeavor
40 (Bsack Cover)
Looking for the answer? Check
https://hvac-blog.acca.org in October for the answer to this issue’s Tech Challenge.
York
www.york.com/contractor
17
36
SEPTEMBER/OCTOBER 2023
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