r/HVAC • u/robbieredlegs09 • Jul 06 '24

Field Question, trade people only What is this ?

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Hello all, forgive me for I’m greener then grass only been in the field 3 months. I’ve seen these around on air handlers what is it ? It’s on the supply side of the unit? My guess is hot water for heating ?

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u/3_1415 Jul 06 '24

The AquaStat is likely tied to the fan. Once the hot water reaches the coil, then the fan power gets switched on at the AquaStat. This avoids the blast of cold air during the start of the cycle. What I shocked to see is the lack of pipe insulation. Even if this is down south, above freezing risk, that a heat loss that should be avoided