All condensate drain connections and oor drains must be
trapped at the job site location. Failure to properly trap a drain
will result in ooding of the drain pan and potential water
damage to the air-handling unit and other building facilities.
To design the drain traps, reference Figure 28 as well as the
total static pressure (TSP) associated with the main fan and
motor as indicated on the applicable AcuAir data drawing.
AcuAir recessed hygienic drain pans are triple sloping and
have a minimum depth of 3” at the drain connection. Drain
pans and pipe stub outlet connection are constructed of 304
stainless steel unless specied otherwise. The cooling coil
supports are constructed of material similar to the air unit
interior liner and may not be stainless steel.
SLOPE
RECESSED HYGIENIC OUTLET
SLOPE
MPT
SLOPE
AIRFLOW
ACUAIR UNIT
HOUSING
REFRIGERANT
CONNECTION
STUB DRAIN
DRAIN PAN
HOT CHANNEL
COIL SUPPORT
COIL SUPPORTS
– Every effort must be made in eld piping to keep
the stresses to a minimum on the coil connections.
a. Allow for thermal expansion and contraction of all eld
piping.
b. Do not rely on the coil connections to support the weight
of the eld piping.
c. Design piping to minimize transmittal of vibration through
the piping to the unit coils.
– When a steam coil is supplied, the steam
piping must be installed in accordance with state and local
codes and accepted industry practices. Please refer to the
supplied piping diagram for specic information.
Prior to shipment, steam coils are pressure tested for a
maximum operating pressure of 150 PSI. It is recommended
that the steam pressure be reduced to 15-50 PSI or lower
for maximum steam coil life and optimum control operation.
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