508298-01
Page 29 of 55
Issue 2219
Exhaust through Crawl Space Vent Option
All 33” condensing gas furnaces (92%+) are now approved
to be vented down through a crawl space. Ensure a vent
pipe drain kit, 51W18 (USA) or 15Z70 (Canada), is used as
directed through the floor joists and into the crawl space.
See the following figures.
Consult the vent tables for vent lengths and approved
materials.
2” or 3”
Sanitary Tee
1/2” PVC
Drain Stub
Drain Trap
Assembly
Rubber Boot (51W18)
Drain Plug (15Z70)
Clamp
(51W18 Only)
From
Furnace
To Vent
Termination
Drain Trap
(assembled)
Figure 42.
Kit 51W18 (USA) / 15Z70 (Canada) Parts
Identification and Assembly
Exhaust from
Furnace
To Termination
Exhaust from
Furnace
To Termination
* Kit 51W18 is shown.
Figure 43. Crawl Space Vent Pipe Drain Trap
Assembled Incorrectly
Figure 44.
Upflow or Downflow Furnace with Exhaust through Crawl Space
KIT 51W18 (USA)
Basement Floor
To Termination
1/2” PVC to
Code-Approved
Drain
24” max.
Downflow Furnace
Exhaust
KIT 15Z70 (Canada)
* Kit 51W18 is shown.
NOTE:
Upflow furnaces exhaust from the left side. All dimensions shown are typical for upflow or downflow furnaces.
NOTE:
All horizontal runs of exhaust pipe must slope back toward the kit a minimum of 1/4” (6mm) for each 12” (305mm) to ensure drainage.
Summary of Contents for A96DF1E
Page 32: ...508298 01 Page 32 of 55 Issue 2219 Figure 50 Trap Drain Assembly Using 1 2 PVC or 3 4 PVC ...
Page 51: ...508298 01 Page 51 of 55 Issue 2219 Troubleshooting Heating Sequence of Operation ...
Page 52: ...508298 01 Page 52 of 55 Issue 2219 Troubleshooting Heating Sequence of Operation continued ...
Page 53: ...508298 01 Page 53 of 55 Issue 2219 Troubleshooting Cooling Sequence of Operation ...
Page 54: ...508298 01 Page 54 of 55 Issue 2219 Troubleshooting Continuous Fan Sequence of Operation ...