Coolerado Installation
Page 9 of 63
Pooling of water near the unit will also allow excess humidity
to be drawn into the unit, which will reduce the cooling
performance of the unit.
CAUTION: Do not discharge to roof top drains that drain to
parking lots or alleys. (The continual flow of water will cause
a slick green alga growth).
Drain Connection, Figure 10
If the unit drain line is connected to an internal building
sanitary sewer drain line, it must feed into a 1-1/4” (40mm),
(or larger) plumbing drain line that meets all plumbing code
requirements. The drain line must be vented as it enters the
building sanitary sewer drain line.
Step 6—Outdoor Intake Air
NOTE: The intake air duct must not be located near the units
working air duct.
Install and inspect ductwork if needed.
The intake air can enter the unit directly or through a
properly sized duct. Use intake sizes from Table 1:
22 inches, (20” at fan
inlet)
560 mm, (508 mm
at fan inlet)
Intake Duct Sizes, Table 1
NOTE: If the unit is installed in a building (attic or other) a
duct may be needed to draw fresh intake air into the unit
from outside the building.
NOTE: The free open area of the intake grill must equal the
duct area. Failure to do so may cause excessive pressure
drop across the grill, see duct sizes in Table 1.
NOTE: If rigid duct is used to connect to the unit’s intake air,
it must be designed to be easily removed to allow service
access.
NOTE: In some roof top installations, parapet walls can trap
the heavy cool humid working air below the walls causing
the intake air to have a high humidity resulting in higher
conditioned air temperatures. In these situations, the intake
air may need to be brought from a higher location, see
Figure 11.
High Parapet Walls, Figure 11
Intake Snorkel, Figure 12
Step 7 –Conditioned Air Duct
1.) Install properly sized, sealed and insulated
conditioned, R6 minimum, air duct to unit.
2.) For all units the conditioned air plenum is shipped
without pre-cut duct openings. This allows the
installer to add the ducts where desired on location.
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