To prevent condensation in the furnace and vent system, the following precautions must be observed:
1.The return-air temperature must be at least 60_F (16_C)db except for brief periods of time during warm-up from setback at no lower than 55_F (13_C) db or during initial start-up from a standby condition.
2.Adjust the gas input rate per the installation instructions. Low gas input rate causes low vent gas temperatures, causing condensation and corrosion in the furnace and/or venting system. Derating is permitted only for altitudes above 2000 ft. (610 M).
3.Adjust the air temperature rise to the midpoint of the rise range or slightly above. Low air temperature rise can cause low vent gas temperature and potential for condensation problems.
4.Set the thermostat heat anticipator or cycle rate to reduce short cycling.
Air for combustion must not be contaminated by halogen compounds which include chlorides, fluorides, bromides, and iodides. These compounds are found in many common home products such as detergent, paint, glue, aerosol spray, bleach, cleaning solvent, salt, and air freshener, and can cause corrosion of furnaces and vents. Avoid using such products in the combustion-air supply. Furnace use during construction of the building could cause the furnace to be exposed to halogen compounds, causing premature failure of the furnace or venting system due to corrosion.
Vent dampers on any appliance connected to the common vent can cause condensation and corrosion in the venting system. Do not use vent dampers on appliances common vented with this furnace.
ADDITIONAL VENTING REQUIREMENTS
A 4” (101 mm) round vent elbow is supplied with the furnace. A 5-inch (127 mm) or 6- inch (152 mm) vent connector may be required for some model furnaces. A field-supplied 4-inch-to-5-inch (101 - 127 mm) or 4-inch-to-6-inch (101 -
152mm) sheet metal increaser fitting is required when 5-inch
(127 mm) or 6-inch (152 mm) vent connector is used. See Fig. 34-46 Venting Orientation for approved vent configurations. NOTE: Vent connector length for connector sizing starts at furnace vent elbow. The 4-inch vent elbow is shipped for upflow configuration and may be rotated for other positions. Remove the
3screws that secure vent elbow to furnace, rotate furnace vent elbow to position desired, reinstall screws. The factory-supplied vent elbow does NOT count as part of the number of vent connector elbows.
The vent connector can exit the door through one of 5 locations on the door.
1.Attach the single wall vent connector to the furnace vent elbow, and fasten the vent connector to the vent elbow with at least two field-supplied, corrosion-resistant, sheet metal screws located 180_ apart.
NOTE: An accessory flue extension KGAFE0112UPH is available to extend from the furnace elbow to outside the furnace casing. If flue extension is used, fasten the flue extension to the vent elbow with at least two field-supplied, corrosion-resistant, sheet metal screws located 180_ apart. Fasten the vent connector to the flue extension with at least two field-supplied, corrosion resistant sheet metal screws located 180_ apart.
2.Vent the furnace with the appropriate connector as shown in Fig. 34-46.
!CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing furnaces.
3.Orient the door to determine the correct location of the door cutout to be removed.
4.Use aviation-type tin snips to remove the correct U-shaped cut-out in door.
NOTE: If this furnace is equipped with knockouts in the door for the vent, a number of techniques can be used to remove these knockouts as seen in Fig. 47 through 51. The knockout in the bottom of the door is unique due to its flanging and is not easily removed by first cutting the two tie points at the edge of the door, using aviation-type tin snips. (See Fig. 47.) A sharp blow to the rounded end of the knockout (See Fig. 48.) will separate more tie points and allow the knockout to be pulled loose. (See Fig. 49.) Remove all burrs and sharp edges. For the knockouts in the other locations on the door (top and sides), tin snips can also be used along the door edges; however, the preferred method is to use a hammer and screwdriver to strike a sharp blow (See Fig. 50.) directly to the knockout tie points or use a hammer in the upper left corner of the desired knockout. (See Fig. 51.) Remove all burrs and sharp edges.
!CAUTION
BURN HAZARD
Failure to follow this caution may cause personal injury.
Hot vent pipe is within reach of small children when installed in downflow position. See the following instruction.
An accessory Vent Guard Kit, KGAVG0101DFG is REQUIRED for downflow applications for use where the vent exits through the lower portion of the furnace casing door. Refer to the Vent Guard Kit Instructions for complete details.
The horizontal portion of the venting system shall slope upwards not less than 1/4-in. per linear ft. (21 mm/M) from the furnace to the vent and shall be rigidly supported every 5 ft. (2 M) or less with metal hangers or straps to ensure there is no movement after installation.
SIDEWALL VENTING
This furnace is not approved for direct sidewall horizontal venting.
In the U.S.: Per section 12.4.3.1 of the NFPA54/ANSI Z223.1-2006, any listed mechanical venter may be used, when approved by the authority having jurisdiction.
In Canada: Per section 8.24.2 of the CAN/CSA-B149.1-05, any listed venters may be used, when approved by the authority having jurisdiction.
Select the listed mechanical venter to match the Btuh input of the furnace being vented. Follow all manufacturer’s installation requirements for venting and termination included with the listed mechanical venter.
