water keeps building up in heat exchanger pressure switch
Barring any other reasons: 1) The pressure builds up in the pressure switch which is likely being released quickly at some point 2) The release of pressure is an endothermic reaction (it gets cold) 3) Moisture in the air condenses into small water drops. 4) The process repeats and the water quantity increases.
Probably because the pressure switch heats up during the day and when the night cool the pressure switch, the pressure switch housing 'breaths in cool air which condenses the moisture in the switch housing. If this is not an explosion proof housing, you might put a drain in the housing. Another solution is to orient the conduit hub toward the ground and install a drain seal so the moisture drains into the conduit hub and out the drain of the drain seal.
