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507295-02C Page 5 of 13mrcool.com
Duct System
The duct system should be designed and sized according
to the methods in Manual Q of the Air Conditioning
Contractors of America (ACCA).
A closed return air duct system shall be used. This shall
not preclude use of economizers or outdoor fresh air
intake. It is recommended that supply and return air duct
The supply and return air duct systems should be designed
for the CFM and static requirements of the job. They
should not be sized by matching the dimensions of the
duct connections on the unit.
connections). Before attaching side ducts, bend perforated
duct tabs out to assist with duct alignment and attachment.
Duct attachment screws are intended to go into the duct
panel. Duct to unit connections must be sealed and
weather proofed.
kit is required, and the following conversion is required.
1. Using a knife, cut following the marked cut lines on
the unit base insulation to access bottom metal covers
underneath the insulation.
2. Remove the screws securing the bottom covers, and
discard the bottom covers (supply and return).
3. Remove screws located between the supply and return
air openings that attach the blower deck to the base,
and discard these screws. These screws can interfere
with bottom duct connections or roof curb seals.
4.
conversion kit over the side duct openings (use
dimples on back panel to locate cover attachments).
5.
Filters
the unit in applications where access to the rear panel
is limited.
NOTE:
Table 2. Unit Air Filter Sizes - inches
Unit Model Filter 1 Filter 2
24, 30, 36 14 X 20 20 X 20
42, 48, 60 20 X 20 20 X 20
Condensate Drain
This package unit is equipped with a 3/4” FPT coupling
for condensate line connection. Plumbing must conform
to local codes. Use a sealing compound on male pipe
threads.
Do not operate unit without a drain trap. The condensate
drain is on the negative pressure side of the blower;
therefore, air being pulled through the condensate line will
prevent positive drainage without a proper trap.
The condensate drain line must be properly trapped,
routed to a suitable drain and primed prior to unit
commissioning.
NOTE: Install drain lines and trap so they do not block
service access to the unit.
See Figure 3 for proper drain arrangement. The drain line
must pitch to an open drain or pump to prevent clogging
of the line. Seal around the drain connection with suitable
material to prevent air leakage into the return air system.
To prime trap, pour several quarts of water into drain,
Drain lines should be hand-tightened only. Do not use
CAUTION
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