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Water Pump Relay Installation ? How To

J

JKownz

[H]ard|Gawd
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Nov 2, 2004
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I just got a new Pump, I switched from a Swiftech MCP655 Inline Pump to a Eheim 1048. i have bought a Water Pump Control Unit W/Relay. I know i have to clip wires and all but i want to do it right. Anyone have any links or walk threws of how to cut wires and installation ?.
 
If it's a Criticool relay, look at the bottom of this page.
If it's a diy relay, look here.
Otherwise, check the manufacturer's site for instructions.

BTW, why'd you switch from the D5 (655) down to the 1048? Was the D5 too loud even at the lowest setting?
 
On your relay you will have two wires that go to the main coil which control the relay activation.

One of those wires goes to ground; the other gets tapped into any 12-volt (assuming it’s a 12 volt relay) source. That will activate the relay when the computer is powered on and deactivate it when powered off.

Now, you have two or three wires left assuming you have a typical relay. One of those wires will be the “HOT” wire and can be combined with your 12-volt wire you are using to activate the relay.

Of the remaining two wires (again assuming a typical single pole double throw unit) one will be hot only when the machine is turned on, that wire goes to your pump. The other wire on your pump is of course ground.

If you provided a picture of what you have it makes this sort of explanation a bit easier.

Here is a link that might help, but if you really don’t understand relay concept get some help.

http://www.bcae1.com/relays.htm
 
Mysterae said:
Is there a big reason for fitting a relay start to the pump?
Click to expand...
since that is a 120 VAC pump, meaning that it plugs into the wall and not a lead from the computer's PSU, it's handy to have a relay to turn the pump on and off whenever you turn the computer on and off.

i suppose that you could just leave it running all the time, at the cost of premature wear on the pump and a bit of extra noise. you could also put the thing on a simple on-off switch, which you will inevetably forget to switch on or off at least once.......

it's not strictly speaking needed, just really handy.
 
DFI Daishi said:
you could also put the thing on a simple on-off switch, which you will inevetably forget to switch on or off at least once.......
Click to expand...

That's why I went with the criticool powerplant a few yrs back with a hydor pump. Plus the rest of the family using the computer....it would've been a disaster waiting to happen. Of course I very rarely ever turn my pc off.
 
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