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VERTICAL DUCT COVERS
Fig. 10 - - Vertical Duct Cover Removed
4. If unit ductwork is to be attached to vertical opening
flanges on the unit base (jackstand applications only), do
so at this time.
CAUTION
!
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Collect ALL screws that were removed. Do not leave screws
on rooftop as permanent damage to the roof may occur.
5. It is recommended that the base insulation around the
perimeter of the vertical return- -air opening be secured to
the base with aluminum tape. Applicable local codes may
require aluminum tape to prevent exposed fiberglass.
6. Cover both horizontal duct openings with the provided
duct covers. Ensure opening is air- - and watertight.
7. After completing unit conversion, perform all safety
checks and power up unit.
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 horizontal duct installation (by
removing duct covers).
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
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
building practices.
Step 10 — INSTALL ELECTRICAL CONNEC-
TIONS
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
C99012
The unit cabinet must have an uninterrupted, unbroken
electrical ground. This ground may consist of an electrical
wire connected to the unit ground screw in the control
compartment, or conduit approved for electrical ground when
installed in accordance with NEC, ANSI/NFPA American
National Standards Institute/National Fire Protection
Association (latest edition) (in Canada, Canadian Electrical
Code CSA C22.1) and local electrical codes.
!
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution could result in damage to the unit
being installed.
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (latest edition) and local electrical codes
governing 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. Use only copper conductor for connections between
field- -supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high- -voltage power to unit is within
operating voltage range indicated on unit rating plate. On
3- -phase units, ensure phases are balanced within 2
percent. Consult local power company for correction of
improper voltage and/or phase imbalance.
4. Insulate low- -voltage wires for highest voltage contained
within conduit when low- -voltage control wires are in
same conduit as high- -voltage wires.
5. Do not damage internal components when drilling
through any panel to mount electrical hardware, conduit,
etc.
HIGH- -VOLTAGE CONNECTIONS
The unit must have a separate electrical service with a
field- -supplied, waterproof, disconnect switch mounted at, or
within sight from, the unit. Refer to the unit rating plate for
maximum fuse/circuit breaker size and minimum circuit amps
(ampacity) for wire sizing.
The field- -supplied disconnect switch box may be mounted on the
unit over the high- -voltage inlet hole when the standard power
and low- -voltage entry points are used (See Fig. 2 and 3 for
acceptable location).
10
outdoors.
Insulate
ducts
passing
WARNING
CAUTION
through
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