Specifications

44 Rev. 3
COMBUSTION AND VENTILATION AIR
(GUD/GCD Direct Vent Models)
tions in cutting, cleaning, and solvent cementing PVC or
ABS pipe.
WARNING
SOLVENT CEMENTS ARE COMBUSTIBLE LIQUIDS
AND SHOULD BE KEPT AWAY FROM ALL IGNITION
SOURCES (IE: SPARKS, OPEN FLAMES, AND EXCES-
SIVE HEAT). AVOID BREATHING CEMENT VAPORS OR
CONTACT WITH SKIN AND EYES.
All 90 degree elbows must be either medium radius (1/4
bend DWV) or long radius (long sweep 1/4 bend DWV)
types conforming to ASTM D3311. A medium radius (1/4
bend) elbow is 3 1/16" minimum from the plane of one open-
ing to the centerline of the other opening for 2" pipe (4 9/
16" for 3" pipe). These dimensions are shown in the me-
dium radius elbow dimensions drawing on page 41.
This furnace must not be connected to any type B, BW, or
L vent or vent connector and must not be vented into any
portion of a factory built or masonry chimney, except when
used as a pathway for PVC pipe as described below.
Flexible couplings for joining PVC pipe (sometimes called
"no hub connectors") have been used by some installers to
connect the field supplied portion of the flue gas vent sys-
tem to the furnace. Amana Heating & Air Conditioning does
not encourage nor recommend using these connectors.
However, if you do choose to use "no-hub connectors", the
connectors must be gas tight, water tight, and able to with-
stand continuous exposure to the warm, moist, acidic flue
products of the furnace.
It is the responsibility of the installer to follow the
manufacturer's recommendations and to verify that all flue
pipe connectors used are compatible with the furnace flue
products. In addition, the connectors must possess ad-
equate structural integrity to prevent flue pipe separations
during furnace operation or foreseeable misuse and abuse.
This furnace is supplied with 2" and 3" air intake terminal
screens. These screens were shipped in the same plastic
sack which held this manual. For both vertical and horizon-
tal installations, insert the appropriately sized screen into
the air intake terminal until it is firmly secured at the hub of
the terminal elbow. Discard the unused screen.
If the vent (flue) pipe is exposed to extremely cold tem-
peratures and/or long runs through unheated spaces or out-
doors, insulation may be required on the outside of the vent
pipe to prevent condensate from freezing. Canadian install-
ers must take note of the "Additional Canadian Venting Re-
quirements" on page 42. Where required, use 1/2" thick
closed cell foam insulation such as Armaflex or Insultube.
If the combustion air pipe is to be installed above a sus-
pended ceiling or other area where dripping of condensa-
tion will be objectionable, insulation of the combustion air
pipe may be required. Where required, use 1/2" thick closed
cell foam insulation such as Armaflex or Insultube.
LOCATION OF EXHAUST AND INTAKE TERMINATIONS
1. All Installations
This furnace can be installed with either a vertical or hori-
zontal direct vent. In either case, the exhaust vent and the
combustion air intake pipe must be located on the same
side of the structure and separated by no less than 3 inches
and no more than 24 inches.
The following points must also be considered when install-
ing the vent pipe in either a horizontal or vertical applica-
tion:
1. The vent termination must be at least 3 feet above any
forced air inlet located within 10 feet.
Exception: This provision shall not apply to the combus-
tion air intake of a direct vent furnace.
2. The vent termination must be at least 12 inches from
any door, window, or gravity air inlet into any building.
3. The vent must terminate at least 2 feet above ground
level or roof level. If heavy snow accumulation is ex-
pected, this distance will need to be increased.
4. The vent shall not terminate over public walkways or
over an area where condensate or vapor could create a
nuisance or hazard or could be detrimental to the op-
eration of regulators, relief valves, or other equipment.
5. In addition, the combustion air intake should not be ter-
minated in areas that are frequently very dusty or dirty.
CAUTION
DO NOT TERMINATE THE COMBUSTION AIR INTAKE
WHERE THE AIR IS OFTEN HEAVILY CONTAMINATED
WITH COMPOUNDS CONTAINING CHLORINE OR
FLUORINE. COMMON RESIDENTIAL SOURCES OF
SUCH COMPOUNDS INCLUDE:
- SWIMMING POOLS AND SWIMMING POOL
PUMPS/FILTER
- CLOTHES DRYER VENTS
- REMOTE AIR CONDITIONING OR HEAT PUMP
UNITS (A REFRIGERANT LEAK WOULD CON-
TAMINATE THE COMBUSTION AIR.)
- PLUMBING VENT STACKS
- BATHROOM OR SWIMMING POOL EXHAUST
FANS
- UNDRIED PAINT STRIPPERS, ADHESIVES,
PAINTS, VARNISHES, SEALERS, WAXES, AND
SOLVENTS. THESE ARE OFTEN USED DURING
NEW CONSTRUCTION OR REMODELING.
- VARIOUS COMMERCIAL AND INDUSTRIAL PRO
CESSES MAY ALSO BE SOURCES OF CHLORINE/
FLUORINE COMPOUNDS.