3607 A/C

[chiroman24]

quick question for the 3607 owners out there. We have and 83 3607 with 3 A/c units and one A/C water pump. When we turn on the pump at the panel, the pump runs continuously, whether the A/c compressor(s) is running or not. Is this correct or should the pump cycle on and off with the compressor(s) on the units? Did someone change the wiring? Thanks for any input. I'm just not sure how it was originally configured.

[throwback2]

On my 1987 Carver,the water pumps out as long as the Ac or heat is on.

[g36]

It should be controlled though a ac pump relay box. May have a stuck relay. Causing continuous running. Who know if previous owner bypassed this with out some investigation . Get in engine room and look for a box mounted on support or follow electric leads from ac pump to connecting point.

[buster53]

Source of the post On my 1987 Carver,the water pumps out as long as the Ac or heat is on.

My 3807 had 3 units as well and as long as any of them were turned on to either heat or cool mode (not just fan) the pump ran. Pretty sure that is standard operating procedure. Think about it, with 3 units running and 3 compressors cycling on and off, the pump would be in a state of constant changing between on/off. Doesn't make sense to hook it up that way.

[mjk1040]

That pump should only run when any one of the AC units call for it. If the previous owner had a unit that didn't turn the pump on when it was calling for it, it's very possible the pump got hot wired to run continuously. Or as stated above a relay may be stuck. If you find no such hot wiring or jumper wires in the three AC unit circuits, then I would look for a bad relay. Good luck in your investigation.

[chiroman24]

Thanks for all the help! I will search for a relay box/follow the wiring and see where it leads. My suspicion is someone "hot wired" around the relay switch. I will update in case it may be of help to someone else. thanks!

[bud37]

Not the same boats, but I have had both ways.....constant run and only when call for heat or cold, one much older though late 70's, air only on that one.

[kamakazerc]

Hi. I have a 1988 3607, and pump "is" designed to run all the time if any or all three of the units are turn on. As buster says... Does it really make sense to have it cycle that often, if you have one or more units turned on. I know , even as quiet as those pumps can be. After a while, if the pump cycled constantly, it would be like a Chinese water torture ... Just say-in

[chiroman24]

Source of the post Hi. I have a 1988 3607, and pump "is" designed to run all the time if any or all three of the units are turn on. As buster says... Does it really make sense to have it cycle that often, if you have one or more units turned on. I know , even as quiet as those pumps can be. After a while, if the pump cycled constantly, it would be like a Chinese water torture ... Just say-in

I agree, that would be a little annoying. with ours, even if the unit are completely turned off, if we turn the water pump on at the breaker panel, it comes on and runs non stop. The reason the question came up was, we are refurbishing our interior and as part of that we are replacing the salon A/C unit There seems to be an "extra set of wires (like romex) leaving the unit and heading somewhere. After reading, we are assuming it must be part of the loop back to the relay. We will find out in the next couple weeks!

[Viper]

The only time I've seen the pump run all the time without one of the AC units running is with a stuck relay as mentioned above or when the pump driver/relay in the control box has failed. Rather than purchase a new control box ($$) or be without heat/air for a while, owners simply bypass the box or get a tech to bypass until they get a new box or relay later, which sometimes gets put on the back burner and never happens!