Upflow vertical install - drain exit side

What is going on

Upflow GMVC96 family furnace standing vertical. Leave the condensate trap and hoses the way the factory ran them. Drain can come out left or right. Don't let it hold water.

Likely causes

• Not a fault call. Setup notes for the drain exit on a vertical upflow.

Check in this order

1. Leave the trap and factory hoses as shipped, no re-routing.
2. Pick right or left side. Both sides have two 0.875 in holes, usable for drain or low voltage wiring.
3. Need the exit higher? Add a 0.875 in hole in the marked cutout area.
4. Seal whatever cabinet opening you don't use, so no air leaks in or out.
5. Run the drain hose with a steady fall. No sags, no low spots holding water.
6. After hookup, run a heat cycle and look for drips at the hose connections.

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)