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Installation and
Service Manual
27
Combustion air supply must be free of contaminants (see
Combustion and Ventilation Air, page 8). To prevent
recirculation of the flue products into the combustion air inlet,
follow all instructions in this section.
Outdoor Vent/Air Inlet Location
Keep venting areas free of obstructions. Keep area clean and
free of combustible and flammable materials. Maintain a
minimum clearance of 3" (76mm) to combustible surfaces and
a minimum of 3" (76mm) clearance to the air inlet. To avoid a
blocked air inlet or blocked flue condition, keep the outdoor
cap air inlet, flue outlet and drain slot clear of snow, ice, leaves,
debris, etc.
Do not install outdoor models directly on the ground. You must
install the outdoor unit on a concrete, brick, block, or other
non-combustible pad.
Do not locate unit so that high winds can deflect off of adjacent
walls, buildings or shrubbery causing recirculation.
Recirculation of flue products may cause operational
problems, bad combustion or damage to controls. Locate unit
at least 3 feet (0.91m) from any wall or vertical surface to
prevent wind conditions from affecting performance.
Multiple unit outdoor installations require 48" (1.22m)
clearance between each vent cap. Locate outdoor cap at least
48" (1.22m) below and 48" (1.22m) horizontally from any
window, door, walkway or gravity air intake.
Locate unit at least 10 feet (3.05m) away from any forced air
inlet.
Locate unit at least 3 feet (0.91m) outside any overhang.
Clearances around outdoor installations can change with time.
Do not allow the growth of trees, shrubs or other plants to
obstruct the proper operation of the outdoor vent system.
Do not install in locations where rain from building runoff
drains will spill onto the unit.
Outdoor Vent Cap Kits
* These kits include an outdoor vent cap and gasket.
Flue gas condensate can freeze on exterior walls or on the vent
cap. Frozen condensate on the vent cap can result in a blocked
flue condition. Some discoloration to exterior building or unit
surfaces can be expected. Adjacent brick or masonry surfaces
should be protected with a rust resistant sheet metal plate.
The Outdoor Vent Cap Kit
The optional outdoor vent cap kit is available from the
appliance manufacturer. The outdoor cap part numbers are
listed by unit size. See TABLE–H for kit numbers.
Install the outdoor vent cap on the rear of the unit (see FIG. 27).
Complete installation instructions are included with the
outdoor vent cap kit.
FIG. 27 Outdoor Vent Cap Installed on Rear of Unit
Kit* Kit*
Input without with
Btu/hr Pump Cover Pump Cover
399,999 ODK3748 ODK3052
500,000 ODK3748 ODK3052
650,000 ODK3749 ODK3053
750,000 ODK3749 ODK3053
990,000 ODK3036 ODK3049
1,260,000 ODK3064 ODK3065
1,440,000 ODK3037 ODK3050
1,800,000 ODK3038 ODK3051
2,070,000 ODK3038 ODK3051
TABLE-H
Outdoor Vent Cap Kits
ƽ WARNING: Only install outdoor models
outdoors and only use the vent cap supplied by
the appliance manufacturer. Personal injury or
product damage may result if any other cap is
used or if an outdoor model is used indoors.
Properly install all covers, doors and jacket
panels to ensure proper operation and prevent
a hazardous condition.