Need HVAC pro's for question

[bdoles2]

Shouldn't there be a trap on this setup, before the vertical vent. This set up is blowing conditioned air out the vent.

[Scott Gilligan, CMI]

From what I see in the picture, yes a trap should be installed. As far as they system blowing conditioned air into the space, I don't see how that would be possible. The condensate pan is below the evaporator coils which are below the blower. I could see the possibility of it sucking air through the blowout in the picture, but not blowing air out. If it really is blowing air out, I would check the rotation of of the blower motor and it's orientation.

Just read another thread and completely forgot about blow through set-ups. I don't run across any where I'm at because most HVAC contractors install draw through systems from what I see around here. If it is a blow through system, then yes you definately need a trap and there neds to be a cap on that blow-out fitting.

[bdoles2]

Originally Posted by sgilligan1

From what I see in the picture, yes a trap should be installed. As far as they system blowing conditioned air into the space, I don't see how that would be possible. The condensate pan is below the evaporator coils which are below the blower. I could see the possibility of it sucking air through the blowout in the picture, but not blowing air out. If it really is blowing air out, I would check the rotation of of the blower motor and it's orientation.

Just read another thread and completely forgot about blow through set-ups. I don't run across any where I'm at because most HVAC contractors install draw through systems from what I see around here. If it is a blow through system, then yes you definately need a trap and there neds to be a cap on that blow-out fitting.

Thanks Scott...

I wish furnace and heat pump manufacturers put installation documents on the web like other appliances do (water heater,etc...). You know, something to refer to....

[mthomas2]

This pages may help.

They used to be on the Trane site, but have disappeared.

I retrieved them form the Wayback Machine Net Archives, and combined them into a single document:

[bdoles2]

Originally Posted by mthomas2

This pages may help.

They used to be on the Trane site, but have disappeared.

I retrieved them form the Wayback Machine Net Archives, and combined them into a single document:

Great, thanks for the pdf, that is exactly what I was looking for.