T ECH CHA L L ENGE Ad Index BY DI CK SHAW
Arkema
www.forane.com
Share this challenge with your entire staff and see who can figure out the diagnosis first.
A commercial split heat pump system in the cooling mode @ 88° F outdoor ambient, utilizing R-410A, has a customer complaint of no cooling. The system has TXV metering devices on the indoor and outdoor coils with check valves. The symptoms at the business confirm that the compressor and indoor blower are running continuously. What are the “possible causes” with the following measured conditions on this field service check sheet? Note that in the cooling mode, the condenser is the outdoor coil and the evaporator is the indoor coil. (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 Evaporator Split
Compressor Inlet Temp. Total S. H.
Ambient Temp. (Outdoor) Room Temp. (Indoor) Compressor Volts
Compressor Amp. Draw
Carrier
www.carriervrf.com
Federated Insurance
www.federatedinsurance.com/ association-groups/acca
Hudson Technologies
www.hudsontech.com
Midea
www.mideaevox.com
109° F.
295 psig / 94° F. 90° F. 4° F. 6° F.
88° F.
101 psig / 32° F. 36° F. 4° F.
48° F. 48° F. 16° F. 88° F. 80° F. 240 V. Low
Resideo
www.resideo.com/proiq
39 (Inside Back Cover)
Ruud
www.Ruud.com/Endeavor
Center Spread 20 & 21
Trane
www.trane.com
York
www.york.com/contractor
Looking for the answer? Check
https://hvac-blog.acca.org in August for the answer to this issue’s Tech Challenge.
2 (Inside Front Cover)
Mitsubishi
www.discover.mitsubishicomfort.com/ contractors
Pearl
www.pearlcertification.com/ACCA
24
31
11
17
15
40 (Back Cover)
22
29
36
JULY/AUGUST 2023
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