User`s manual

OUT
I
3"MIN
__!_1
IN
--:u
TEE
_.._ NIPPLE
CAP
Fig. 9--Sediment Trap
C99020
o
o
/
/
SUPPLY RETURN
DUCT DUCT
OPENING OPENING
C99011
Fig. 10A SupNy and Return Duct Opening
4. If unit duct_xork is to be attached to x ertical opening flanges
on the unit composite base (jackstand applications only), do so
at this time,
Collect ALL screws that v, ere removed. Do not lea_e screws
on rooftop as pem_anent damage to the roof may occur
5. It is recommended that the unit base insulation around the
perimeter of the vertical return°air opening be secured to the
unit base with aluminum tape. Applicable local codes may
require aluminum tape to prevent exposed fiberglass
6. Cover both horizontal duct openings with the duct covers fl'om
the accessory duct cover kit. 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 fbr installation of
nonresidence-type air conditioning and ventilating systems, NFPA
90A or residence-type, NFPA 90B; and/or local codes and
ordinances.
11
DUCT COVERS REMOVED
C99012
Fig. lOB--Vertical Duct Cover Removed
Adhere to the following criteria when selecting, sizing_ and
installing the duct system:
1 Lnits are shipped for horizontal duct installation (by removing
&ct covers)
2 Select and size ductwork, supply-air registers, and return-air
grilles according to American Society of Heating, Refiigera-
tion and Air (onditioning Engineers (ASHRAE) recommen=
dations
3 Lse flexible transition between rigid dnctwork and unit to
prevent transmission of" vibration. The transition may be
screwed or bolted to duct ['langes. Lse suitable gaskets to
ensure weathertight 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 fbr filters are shown in Tables 1 and 2.
5. Size all dnctwork for naaximnm required airflow (either
heating or cooling) for unit being installed. Avoid abrupt duct
size increases or decreases or perfimnance 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
(SMA(NA) and Air Conditioning Contractors of America
(AC(A) mininmm installation standards for heating and air
conditioning systems. Secure all dtlcts to building structure.
7. Flash, weatherproof, and vibration-isolate all openings in
building structure in accordance with local codes and good
building practices.