Upflow vertical - drain exiting left side

What is going on

Routing the condensate drain out the left side of an upflow furnace uses a hose and fitting kit. The hose cut point depends on the cabinet width, so measure and confirm before cutting.

Likely causes

• Furnace installed with the drain on the left side
• Hose cut at the wrong line for the cabinet width
• Clamp loose or wrong size, leaking
• Fitting installed backwards, barb outside

Check in this order

1. Install the 45 degree pipe/hose coupling through the left side hole, barb end inside. Secure with two #8 self-tapping screws.
2. Cut hose #3 at line B for a 17.5 in cabinet, at line C for a 21 in cabinet, or do not cut for a D width cabinet. Confirm the cabinet width first.
3. Connect the large end of hose #3 to the trap outlet with a 1.25 in clamp.
4. Connect the small end of hose #3 to the 45 degree elbow with a 1 in clamp.
5. Connect the field drain to the furnace trap outlet per the field drain section.
6. Pour water through and check for leaks at the clamps.

More furnace guides

• Airflow lower than demanded, furnace runs on low stage when high stage is expected
• Alternate combustion air opening (upflow or horizontal)
• Alternate vent/flue location (upflow or horizontal left)
• Annual inspection checklist
• Auxiliary limit control (location and purpose)
• Auxiliary limit switch open (blower compartment)