T ECH CHA L L ENGE Ad Index B Y DI C K SHAW Adrian Steel
Share this challenge with your entire staff and see who can figure out the diagnosis first.
www.adriansteel.com/landing/acca Arkema
www.arkema.com Carrier
A commercial rooftop with R-410A refrigerant and a fixed orifice feed device has a customer complaint of insufficient cooling. The symptoms confirm a warm space and the compressor appears to be running continuously. What are the “possible causes” with the following measured conditions on this field service check sheet? (Note: There is only one problem intended.)
FIELD SERVICE CHECK SHEET Compressor Discharge Temp.
Condensing Press./Temp. Condensing Outlet Temp. Condenser Sub cooling 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
www.carriervrf.com Chemours
11 24 13 2 (Inside Front Cover)
www.chemours.com/en Federated Insurance
www.federatedinsurance.com/ association-groups/acca
MiTek 205 deg. F.
338 psig / 104 deg. F. 90 deg. F. 14 deg. F. 16 deg. F. 50 deg. F.
55 psig / 32 deg. F. 68 deg. F. 36 deg. F. 78 deg. F. 46 Deg. F. 88 deg. F. 80 deg. F. 240 V. Low
Mitsubishi
www.discover.mitsubishicomfort.com/ contractors
Pearl
www.pearlcertification.com/contractors Resideo
www.resideo.com/tseries Rheem
www.rheem.com/Endeavor Scorpion
www.scorpion.co/ACCA Trane
www.trane.com York
Looking for the answer? Check
https://hvac-blog.acca.org in June for the answer to this issue’s Tech Challenge.
www.york.com/contractor 12 39 (Inside Back Cover) 9 20 & 21 29 35 40 (Back Cover) 31 17
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