Finally got my HF air dryer hooked up and running. This is is the setup I had before, an air-to-air cooler on the first stage and a refrigerated cooler after the second stage. I had tried running all of the first stage through the air-to-air but it only had 1/4" lines in/out and was slowing things down so I added the bypass loop over the cylinder head so that only a portion of the volume was going through it.
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Got the HF cooler installed into the first stage but ran into a problem with the unit getting too hot.
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There wasn't enough clearance on the left side for adequate air flow. The instructions say two feet of clearance but I just didn't have the space. I was hoping the tiny condenser fan inside this thing wouldn't care but it did, so I cut a hole in the wall and added a ventilation grate.
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And then repurposed the puller fan from the original cooler onto the right side of the new one. You can see I previously did a similar trick with the gray cooler as well when it was installed. I took apart a regular ol' house fan and mounted it onto the top for additional air flow. Everything is wired to the compressor motor so it all turns on/off when the compressor does.
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My garage has this long narrow hallway on one side for storage which is where the compressor sits. It's kind of handy though, I can shut the door to the hallway and it cuts down the noise when the compressor is running.
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The outer garage area is where my air feed terminates. You can see the air line coming in at the floor and going up through two additional moisture traps, a conventional water trap and a desiccant filter before ending at the hose reel. The vent above is the other half of the new air intake. I'm surprised how much air is getting pulled through it, a paper towel sticks to it when the compressor is running.
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The new cooler is performing well. I measured 152° at the inlet and 93° at the outlet. Every 20° drop in air temp releases 50% of the moisture trapped in the compressed air so much of the moisture is eliminated before going to the second stage.