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Old 07-20-2018, 04:37 PM   #1
City: Seaford Va on Poquoson River, VA
Country: United States
Vessel Name: Old Glory
Vessel Model: 1970 Egg Harbor 37 extended salon model
Join Date: Jan 2016
Posts: 1,836
Replaced Cruisair potential relay, old one smoked literally.

Installed new relay and greased up some bits with marine grease which does not easily wash off.
I moved the relay up high above the run capacitor, that was a good idea, and is plenty of room to do that. High pressure cutt off switch is to right of start relay.

It was about 3 years old. I turned it on few days ago, smelled lots of burnt bakelite. Came back into cabin as the breaker snapped off. Lifted hatch and nasty burnt smell. Start relay could no longer turn off the start capacitor, so drew lots of excess currents. Lots of rust internally on relay. They just rivet the electrical connections together. High resistance due to corrosion overheated the relay. When I took it apart to see, it crumbled.

For the new relay I soldered the rivets to the frames inside relay, then I dipped whole relay in 5W-50 oil. Let it drip dry and cleaned off the contact points. Soldering it on the inside will guarantee a better connection.

Some Cruisair heat pumps came with super tall run caps and using them would not have fit with moving the relay.

Fixed up all wires and one new lug on one wire running to the magnet coil for the heat pump to AC flow valve.

All 5 wires on terminal 6 are neutral return type wires. For the water pump, the change over valve, the compressor run capacitor, start capacitor, neutral return.

I feel like this relay with my mods will work better longer.

Runs good again.

Link to running again
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