Configuring Units For Downflow (Vertical); Discharge - Bryant 574B Installation Instructions Manual

CONFIGURING UNITS FOR DOWNFLOW (VERTICAL)

DISCHARGE

WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing or servicing system, always turn off main
power to system. There may be more than one disconnect
switch.
1. Open all electrical disconnects before starting any service
work.
2. Remove horizontal (metal) duct covers to access vertical
(downflow) discharge duct knockouts in unit base.
3. Use a screwdriver and hammer to remove the panels in the
bottom of the unit base (See Fig. 9 & 10).
SUPPLY
DUCT
OPENING
Fig. 9 - - Supply and Return Duct Opening
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.
RETURN
DUCT
OPENING
C99011
VERTICAL DUCT COVERS
Fig. 10 - - Vertical Duct Cover Removed
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 outdoors.
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.
10
Insulate ducts passing through
C99012