Jeff Wisnia wrote:

dkhedmo wrote:

We're having ac installed in a couple of days. I mentioned this to the
plumber while he was hear checking the pump which pumps our
kitchen/utility room drain water up through the attic then down to where
it exits the house because of the pipe under the slab having rotted out
just before we bought the house.

Anyway, all the ac guys who came to give me estimates talked about
draining something from the ac unit into either the laundry tub in the
utility room, which then drains into aforementioned pump, or tapping
directly into the pump. (Furnace/pump/laundy tub all within arm's reach
of each other in utility room.)The plumber would prefer they drain it
into the laundry tub, but said that they're not supposed to drain it
into the sewer at all, and that they should drill a hole into the slab
and put the hose into that.

I'm always willing to learn something new, and I can't think of a reason
why your plumber says they're not supposed to drain it into a sewer.

If you drain it into the laundry tub, where's it going to end up, on Mars?

Whoops, maybe I just thought of a reason. Perhaps they worry that if it
has its own trap that trap could dry out over the winter season and let
sewer gas come out into the house?

Could you ask your plumber for an explanation for his remarks?

Jeff
--
Jeffry Wisnia
(W1BSV + Brass Rat '57 EE)
The speed of light is 1.8*10^12 furlongs per fortnight.

It likely falls under the same rules as for sump pumps and gutters and
is based on the fact that the output from them is generally plain
relatively clean water that does not require treatment. They don't want
this clean water adding unnecessary volume to the waste stream headed
for the treatment plant. The discharge should just be directed outside
somewhere, like where it will water some plants.