AAON RL-240 - Manual (Page 38)

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minimum pressure drop, so do not include
dirt allowance pressure drops for filters.
The bottom of the leaving pipe should be at
least one half inch lower than the bottom of
the drain pan connection. This ensures
proper drainage when the unit is not
running.
Note: It may be necessary to fill the trap
manually, or the trap can be filled
automatically by operating the unit until
enough condensate collects to fill the trap.
The trap will then be filled when the unit is
turned off.
Table 7 - Blow-Through Drain Trap Dimensions
Blow-Through
Drain Pan Pressure Trap Dimension
Positive Static Y
(inches of water) (inch)
0.5 1.5
1.0 2.0
1.5 2.5
2.0 3.0
2.5 3.5
3.0 4.0
3.5 4.5
4.0 5.0
4.5 5.5
5.0 6.0
5.5 6.5
6.0 7.0
6.5 7.5
7.0 8.0
7.5 8.5
8.0 9.0
Hot Water/Steam Heating and Chilled
Water Cooling Coils
Internal header connections are provided for
field connection of control valves and
piping. Chilled water piping case will be
provided in the base of the unit, through the
drain pan, for routing water piping.
Evaporative-Cooled Condenser
There are two field water connections that
must be made for the evaporative-cooled
condenser. There is a 3/4” PVC socket city
makeup water connection and a 2” PVC
socket drain connection. This drain should
connect to a sanitary sewer or other code
permitted drain. These connections can go
through the base or the wall of the unit.
There is a cutout in the base with a cap that
is 1” tall and the cap is sealed to the unit
base to prevent any leaks in the unit from
penetrating into the building. Any piping
through the base should go through a field
cutout in this cap. The pipes must be sealed
to the cap once the piping is complete to
prevent any leaks in the unit from
penetrating into the building.
A field cutout must be made in the wall if
the evaporative-cooled condenser piping is
to go through the unit wall. This cutout must
be sealed once the piping is installed to
prevent water from leaking into the unit.
All condensate drains must be
trapped individually before they are
connected to a common line.
CAUTION
All condensate drain connection must
be used. Drain pans are sloped
towards connections.
CAUTION
Installing Contractor is responsible
for proper sealing of the water piping
entries into the unit Failure to seal the
entries may result in damage to the
unit and property.
CAUTION