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ensure weather--tight and airtight seal. When electric heat is
installed, use fireproof canvas (or similar heat resistant material)
connector between ductwork and unit discharge connection. If
flexible duct is used, insert a sheet metal sleeve inside duct. Heat
resistant duct connector (or sheet metal sleeve) must extend 24--in.
(610 mm) from electric heater element.

3. Size ductwork for cooling air quantity (cfm). The minimum

air quantity for proper electric heater operation is listed in

Table 2. Heater limit switches may trip at air quantities
below those recommended.

4. Seal, insulate, and weatherproof all external ductwork. Seal,

insulate and cover with a vapor barrier all ductwork passing
through conditioned spaces. Follow latest Sheet Metal and

Air Conditioning

Contractors

National Association

(SMACNA) and Air Conditioning Contractors Association
(ACCA) minimum installation standards for residential

heating and air conditioning systems.

5. Secure all ducts to building structure. Flash, weatherproof,

and vibration--isolate duct openings in wall or roof
according to good construction practices.

CONFIGURING UNITS FOR DOWNFLOW

(VERTICAL) DISCHARGE

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.
Before performing service or maintenance operations on the

system, turn off main power to unit and install lockout tag.

There may be more than one disconnect switch.

WARNING

1. Open all electrical disconnects and install lockout tag before

starting any service work.

2. Remove horizontal (metal) ductcovers to access vertical

(downflow) discharge duct knockouts in unit basepan. (See
Fig. 9.)

To remove downflow return and supply knockout covers, break
front and right side connecting tabs with a screwdriver and

hammer. Push cover down to break rear and left side tabs.

NOTE

: These panels are held in place with tabs similar to an

electrical knockout. Reinstall horizontal duct covers (Fig. 9)
shipped on unit from factory. Insure openings are air and
watertight.

NOTE

: The design and installation of the duct system must be in

accordance with the standards of the NFPA for installation of
nonresidence--type air conditioning and ventilating systems, NFPA
90A or residence--type, NFPA 90B; and/or local codes and
ordinances.
Adhere to the following criteria when selecting, sizing, and

installing the duct system:

1. Units are shipped for side shot installation.

2. Select and size ductwork, supply--air registers, and

return--air grilles according to American Society of Heating,
Refrigeration and Air Conditioning Engineers (ASHRAE)

recommendations.

3. Use flexible transition between rigid ductwork and unit to

prevent transmission of vibration. The transition may be
screwed or bolted to duct flanges. Use suitable gaskets to
ensure weather--tight and airtight seal.

4. All units must have field--supplied filters or accessory filter

rack installed in the return--air side of the unit.

Recommended sizes for filters are shown in Table 1.

5. Size all ductwork for maximum required airflow (either

heating or cooling) for unit being installed. Avoid abrupt

duct size increases or decreases or performance may be
affected.

6. Adequately insulate and weatherproof all ductwork located

outdoors. Insulate ducts passing through unconditioned
space, and use vapor barrier in accordance with latest issue

of Sheet Metal and Air Conditioning Contractors National
Association (SMACNA) and Air Conditioning Contractors

of America (ACCA) minimum installation standards for
heating and air conditioning systems. Secure all ducts to
building structure.

7. Flash, weatherproof, and vibration--isolate all openings in

building structure in accordance with local codes and good