STANDARD FURNACE CONNECTIONS
It is the responsibility of the installer to ensure that the piping connections to the furnace are secure, airtight, and adequately supported.
All furnaces are shipped with a combustion air connection on the cabinet exterior and a flue connector on the inside of the cabinet on the condensate collector box.
VENTIFLUE PIPE
VenUflue pipe can be secured to the vent/flue coupling using the rubber coupling and worm gear hose clamps provided with this furnace (see "Standard connections" figure). The rubber coupling allows separation of the vent/flue pipe from the furnace dUring servicing.
Combustion Air and Vent piping should be routed in a manner to avoid contact with refrigerant lines, metering devices, condensate drain lines, etc. If necessary, clearances may be increased by utilizing two
45degree
90degree elbow when considering elbow count.
NOTE: Do not use other commercially available "no hub connectors" due to possible material conflicts. The venUflue pipe can also be secured using a PVC or ASS elbow or coupling using the appropriate glue (see Section VI, Materials and Joining Methods).
VENTIFLUE AND COMBUSTION AIR PIPE LENGTHS
Refer to the following table for applicable length, elbows, and pipe diameter for construction of the venUflue and combustion air intake pipe systems of a direct vent (dual pipe) installation. The number of elbows tabulated represents the number of elbows and/or tees in each (Vent/Flue & Combustion Air Intake) pipe. Elbows and/or tees used in the terminations must be included when determining the number of elbows in the piping systems.
If the combustion air intake pipe is to be installed above a finished ceiling or other area where dripping of condensate will be objectionable, insulation of the combustion air pipe may be reqUired. Use W thick closed cell foam insulation such as Armaflex or Insultube where reqUired.
Three (3) Inch Pipe Diameter
Maximum Allowable Length of Vent/Flue and
Combustion Air Intake PiDe (ft.)
Unit | Vent/flue/Air |
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Input | Intake Pipe | ||||||||||
BTU | Termination |
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| 2 | 3 | 4 | 5 | 6 | 7 |
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50,000 |
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75,000 | Standard | 68 | 65 | 62 | 59 | 56 | 53 | 50 | |||
100,000 | |||||||||||
125,000 |
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50,000 |
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75,000 | Alternate | 55 | 52 | 49 | 46 | 43 | 40 | 37 | |||
100,000 | |||||||||||
125,000 |
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Notes:
1.Minimum reqUirement for each vent pipe is five (5) feet in length and one elbow/tee.
2.Tee used in the vent/flue termination must be included when determining the number of elbows in the piping system.
3.3" diameter
4.Increased Clearance Configurations using (2) 45 degree Long Sweep elbows should be considered equivalent to one 90 degree elbow.
Vent/Flue and combustion Air Pipe
Tenninations
The vent/flue and combustion air pipes may terminate vertically, as through a roof, or horizontally, as through an outside wall. Vertical pipe terminations should be as shown in the following figure. Refer to Section VI Vent/Flue Pipe and Combustion Pipe Termination Locations for details concerning location restrictions. The penetrations through the roof must be sealed tight with proper flaShing such as is used with a plastic plumbing vent.
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