I made the mistake of researching when I install a trap on suction line, and every manufacturer/HVAC site seems to have a different answer, so now I'm more confused. I'm gonna install a HP which is above the air handler, coil in basement. Piping is gonna go up 15' come over a few feet back down then over a few feet then into HP. Do I have to install a trap at the suction riser???? It's 410a, 35' line set at most.
Goodman says anything over 20' install trap ( says 2 different things)
Carrier Puron piping guideline says no trap period
HVAC new says anything over 20'
Goodman long line set practices says install if elevation diff exceeds 80'
General info site says anything over 15'
Lennox says 5-50' install a trap
Some sites are saying if the height difference is more than 15'
What's the general rule, as far as a trap? Difference with refrigerants? is it just for a vertical run? Difference with a HP? Just wanna know the general rule and my situation above guys? I figure I ask techs here versus what I read on a piece of paper or website.