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Strange problem. I have been servicing HVAC for 23 years and have a strange problem. I have 2

by Guest16452862  |  10 years ago

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I have been servicing HVAC for 23 years and have a strange problem. I have 2 Lennox GCS series rooftop units that work properly in a restaurant. The complaint is that one minute it feel cool in the dining room and the next i'ts sweltering hot! Each unit is controlled by a H/W
T7300A1005 t-stat, Q7300A1018 subbase, with T7022A1010-1 remote sensors. Sensors are good and clean, dip switches set for remote, Set point at 74
degrees. First stage closes at 71*F. and heat comes on, second stage closes soon after. Second stage shuts off (opens) at 74*F. and first stage continues to heat, not shutting off until it reaches 83-84*F.!
This has been an ongoing problem for years and seems to only become a problem when i'ts bitter cold or very hot outside. Any Ideas?

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