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NOTE: Drain plug is shown in factory-installed position.
Fig. 7 — Condensate Drain Connection
NOTE: Trap should be deep enough to offset maximum unit static dif-
ference. A 4-in. trap is recommended.
Fig. 8 — External Trap Condensate Drain
CAUTION: When drilling the duct system fastening
holes into the side of the unit for duct flanges, be care-
ful not to puncture the coil or coil tubes. See Fig. 9.
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 gas-
kets to ensure weather- and airtight seal.
4. When horizontal return is used, install external field-
supplied air filter(s) in return-air ductwork where it is
easily accessible for service. Recommended filter sizes
are shown in Table 1.
5. For horizontal applications be sure ductwork does not
cover nameplate (Fig. 9).
6. Size all ductwork for maximum required airflow (either
heating or cooling) for unit being installed. Avoid abrupt
duct size increases or decreases.
7. Adequately insulate and weatherproof all ductwork
located outdoors. Insulate ducts passing through un-
conditioned space, and use vapor barrier in accordance
with latest issue of SMACNA (Sheet Metal and Air Con-
ditioning Contractors National Association) and ACCA
(Air Conditioning Contractors National Association)
Fig. 9 — Location of Coil Area
minimum installation standards for heating and air con-
ditioning systems. Secure all ducts to building
structure.
A minimum clearance to combustibles is not required
around ductwork on vertical discharge units. On hori-
zontal discharge units, a minimum clearance of 1 in. is
required for the first 12 in. of ductwork.
8. Flash, weatherproof, and vibration-isolate all openings
in building structure in accordance with local codes and
good building practices.
C. Electrical Connections
WARNING: The unit cabinet must have an uninter-
rupted, unbroken, electrical ground to minimize the pos-
sibility of personal injury if an electrical fault should
occur. This ground may consist of electrical wire con-
nected to the unit ground lug in the control compart-
ment or conduit approved for electrical ground when
installed in accordance with NEC, ANSI (American
National Standards Institute)/NFPA 70 (in Canada,
Canadian Electrical Code CSA [Canadian Standards
Association] C22.1), and local electrical codes. Failure
to adhere to this warning could result in personal
injury.
CAUTION: Failure to obey the following precau-
tions could result in damage to the unit being
installed:
Field Power Supply
1. Make all electrical connections in accordance with NEC
ANSI/NFPA 70-1990 and local electrical codes govern-
ing such wiring. In Canada, all electrical connections must
be in accordance with CSA Standard C22.1 Canadian
Electrical Code Part 1 and applicable local codes. Refer
to unit wiring diagram.
2. A unit disconnect switch is required within sight from
the unit. The disconnect switch may be mounted on the
unit corner post (see Fig. 2). (When mounting discon-
nect switch, be sure the unit rating plate is not
obstructed.)
—7—
Not to be Drilled
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