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Duct System

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 duct system shall be used. This shall not

preclude use of economizers or outdoor fresh air intake. It

is recommended that supply and return duct connections

at the unit be made with flexible joints.

The supply and return air duct systems should be designed

for the CFM and static requirements of the job. They

should not be sized to match the dimensions of the

duct connections on the unit.

The unit is shipped ready for horizontal flow (side duct

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.

If downflow duct system is desired, a downflow conversion

kit is required, and the following conversion is required.

Using a knife, cut following the marked cut lines on

the unit base insulation to access bottom metal covers

underneath the insulation.

Remove the screws securing the bottom covers and

discard the bottom covers (supply and return).

Remove screws located between the supply and return

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.

Secure side duct covers provided in the downflow

conversion kit over the side duct openings (use

dimples on back panel to locate cover attachments).

Install drain pan overflow switch and wire according to

downflow conversion kit instructions.

Air filters are not supplied with the unit. A field-provided air

filter must always be installed ahead of the evaporator coil

and must be kept clean or replaced. Dirty filters will reduce

the airflow of the unit.

An optional filter rack kit may be purchased separately

for installation inside the unit's coil compartment. Air filter

sizes are shown in Table 2 for use with filter rack kit.

507296-01

Filters

The filter rack must be installed prior to installation of

the unit in applications where access to the rear panel

is limited.

Unit Model

24,30,36

42,48,60

Table 2. Unit Air Filter Sizes - inches

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 5 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,

enough to fill drain trap and line.

Drain lines should be hand-tightened only. Do not use

tools to tighten fitting into drain.

Issue 1650

NOTE:

Filter 1

14 X 20

20 X 20

Condensate Drain

CAUTION

Filter 2

20 X 20

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