Table of Contents
Advertisement
Figure 2
shows the proper installation of the vent cover
assembly over the vent outlet on the exterior of the corner
panel. The fasteners used to secure the vent cover assembly
have been included in the owner's package. The following
list summarizes the requirements for the location of the vent
system termination:
• The location of the vent termination must be consistent
with the National Fuel Gas Code (ANSI Z223.1) or CAN/
CGA-B149 Installation Codes.
• The vent termination must be located at least 4 feet
horizontally from any electric meters, gas meters, regulators,
and relief equipment.
• The vent termination must be located at least 3 feet above
any forced air inlet located within 10 feet.
• The vent termination must be located at least 4 feet below,
4 feet horizontally from, or 1 foot above any door, window,
or gravity air inlet into any building.
• The vent termination must be located at least 1 foot above
grade.
• The unit should be installed in a way that prevents any
obstruction of the vent termination during accumulating
snow.
• The unit installation shall avoid areas where condensate
drainage may cause problems by dropping on planters or
patios, etc. Also verify exhaust gases will not impinge on
windows or building surfaces, which may be compromised
or damaged by condensation.
• Do not install the unit such that exhaust from the vent
termination is directed into window wells, stairwells, under
decks, or in alcoves or similarly recessed areas. The vent
termination must not be located above any public walkways.
Figure 2. Vent Assembly
CIRCULATING AIR SUPPLY
WARNING:
Products of combustion must not be allowed to
enter the return air ductwork or the circulating air
supply. Failure to prevent products of combustion
from being circulated into the living space can create
potentially hazardous conditions including carbon
monoxide poisoning that could result in personal
injury or death.
All return ductwork must be adequately sealed, all
joints must be taped, and the ductwork must be
secured to the unit with sheet metal screws. When
return air is provided through the bottom of the unit,
the joint between the unit and the return air plenum
must be air tight.
The roof curb or cement pad on which the unit is
mounted must provide sound physical support of
the unit with no gaps, cracks, or sagging between
the unit and the curb or pad.
Return air and circulating air ductwork must not
be connected to any other heat producing device
such as a fireplace insert, stove, etc. Doing so may
result in fire, explosion, carbon monoxide poisoning,
personal injury, or property damage.
Air Ducts
This unit is designed only for use with a supply and return
duct. Air ducts should be installed in accordance with
the standards of the National Fire Protection Association
"Standard for Installation of Air Conditioning Systems" (NFPA
90A), "Standard for Installation of Residence Type Warm Air
Heating and Air Conditioning Systems" (NFPA 90B), and all
applicable local codes. NFPA publications are available by
writing to: National Fire Protection Association, Batterymarch
Park, Quincy, ME 02269 or visit www.NFPA.org on the web.
• Design the duct work according to Manual D by the Air
Conditioning Contractors of America (ACCA).
• The ducts must be properly sized not to exceed 0.30 inches
WC pressure drop per 100 feet of equivalent duct at 400
SCFM per nominal ton of cooling capacity.
• Duct work should be attached directly to the unit flanges
for horizontal applications.
• If roof curb is installed, the ducts must be attached to the
curb duct supports, not the unit.
• It is recommended that the outlet duct be provided with a
removable access panel. The opening should be accessible
when the unit is installed in service and shall be sizes so that
smoke or reflected light may be observed inside the casing
to indicate the presence of leaks in the heat exchanger. The
cover for the opening shall be attached in a way that will
prevent leaks.
• If outside air is utilized as return air to the unit for ventilation
or to improve indoor air quality, the system must be designed
so that the return air to the unit is not less than 50° F (10°
C) during heating operation.
7
Advertisement
Table of Contents
