Some capacitors are two caps in one where there are three different places to connect wires. They do that because compressors and fans both need run capacitors. If that is the case, on a capacitor you may see 35-15 MFD along with the voltage rating.
Sometimes capacitors with 4 places on each side of the capacitor is just an easy place to wire the common terminal to. Then from the common side, they run a wire to the run side of compressor, the other side of the cap goes to the start side. The power wire on 120v will connect to an on/off, then thermostat, then a kilxon and finally the common terimnal of the compressor. Some compressors have a built in thermal overload and doesn't use a klixon.
Just because there is 4 places to connect wires to on a cap, it's no big deal. If you only have a replacement with 2 terminals on each side, you have to get creative and connect all the wires together before making contact with cap.
If you need more advice, post wiring diagram and pics of both caps.
If you can't figure out how to post pics, I'll leave my email open and you can send me pics there. OK?
BTW, I've never seen a water heater/heat pump but always thought that would be cool. I've have seen water heaters tied to an entire house heat pump.
I've seen commerical units where milk coolers, walk-in coolers and large A/C units are connected to water heaters. Especially like in a large dairy operation where tons of milk needs cooled and tons of hot water is need to keep things clean. I think a one ton compressor can make 12 gallons of free hot water at 145 degrees per hour, at the same time increasing the efficiency of the cooler. Glad to help George
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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