50
The following components should be added:
RA Opening 0.28”
12” Cartridge Filter 0.35”
Pleated Cartridge Filter 0.30”
Cooling Coil 0.45”
Preheat Coil 0.09”
Dirt Allowance
0.35”
These values should be added to the
absolute value of 1.5” to get a total of 3.32”
static pressure. Note that the heating coil
which is downstream of the drain pan and
the discharge opening static pressures are
not used in the calculation.
In this case the ‘X’ dimension of the draw-
through p-trap should be at least 4.32”,
which is the absolute value of the calculated
static pressure in the drain pan plus one
inch. The lower part of the p-trap should be
half that value, or 2.16”.
The total height of the p-trap would be 6.48”
measured from the bottom of the drain pan
connection to the top of the bottom bend, so
one diameter of the pipe needs to be added
to find the required clearance for the drain.
If the outside diameter of the pipe is 1.5” the
total clearance required would be 7.98”. If
the unit has a 6” base rail, accommodations
must be made for an additional 2” of drain
pipe to extend below the base rail.
Summary of Contents for M3 Series
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