I pull out the relayWhat do you have to do to get it to shut off?
What do you have to do to get it to shut off?
check wiring...specifically the 'latching'
ITS THE SAME AS THE OTHER VACS, EVERYTHING SEEMS TIGHT.check wiring...specifically the 'latching'
If the vac stays running, first thing to do is unplug the timer. If it still runs, the relay is bad. If it shuts off when you unplug the timer, the timer is bad (Unlikely but it does happen). Pulling the relay will always shut off the motors no matter what, so that's no test of the problem. The relay is probably bad, but check the timer first to be 100% sure. I recommend upgrading to a 35 amp mercury relay.
my vacs have 3 motors they came with three 7.2 amp motors but somewhere along the way I put in a 10.2 amp for one of the motors
You are running three 7.2 amp motors at a total of 21.6 amps. What size is your current relay? 15 amp?This sounds good, I’ll get a 20 or 30 amp relay
I have seen these recommended multiple times on these forums. Any reason these are recommended instead of contactors? Curious as to why mercury relays are better for this application?... I recommend upgrading to a 35 amp mercury relay.
I was first introduced to mercury relays/contactors about 40 years ago and we’ve been using them ever since. Inside the mercury relay there is a small pool of mercury, when the relay is energized the plunger is pulled down into the pool of mercury completing the circuit. With a regular contactor you have points that will arc and over time burn out. I’ve never had to replace a mercury relay. If you install the mercury relay on your vac and have the timer control the relay your timer will last almost forever since the timer is only activating the coil on the relay. I haven’t replaced a vac timer in over 15 yearsI have seen these recommended multiple times on these forums. Any reason these are recommended instead of contactors? Curious as to why mercury relays are better for this application?
Sounds reasonable for your situation where you already have the mercury relays in operation. For me, contactors are readily available and cheap, also I have contactors on hand most times. Quality contactors cycle thousands of times per summer and last a decade or more in Air Conditioners. I would probably prefer to use a contactor just due to ease of logistics and using what I already have spares available for.I was first introduced to mercury relays/contactors about 40 years ago and we’ve been using them ever since. Inside the mercury relay there is a small pool of mercury, when the relay is energized the plunger is pulled down into the pool of mercury completing the circuit. With a regular contactor you have points that will arc and over time burn out. I’ve never had to replace a mercury relay. If you install the mercury relay on your vac and have the timer control the relay your timer will last almost forever since the timer is only activating the coil on the relay. I haven’t replaced a vac timer in over 15 years
True, I've still got the Brown Paraplate timers s with the large screw head terminals in a bunch of vacuums set up like this.I. If you install the mercury relay on your vac and have the timer control the relay your timer will last almost forever since the timer is only activating the coil on the relay. I haven’t replaced a vac timer in over 15 years