Counterflow horizontal, left side down - drain setup

What is going on

Drain trap and hose setup for a counterflow furnace laid on its left side. Needs at least 5.5 in clearance under the trap.

Check in this order

1. Keep at least 5.5 in clearance beneath the drain trap.
2. Remove the factory drain trap and hose assemblies. Leave the 100 degree elbow clamped in the vent-drain elbow.
3. Remove two 1 in plugs from the left cabinet side.
4. Drain the collector box move the left collector cap (bottom) to the right collector drain port.
5. Clamp the radius end of hose #4 to the collector drain port with a silver clamp.
6. Feed hose #2 through the front drain hole from outside the cabinet.
7. Join hose #4 and hose #2 with a straight barbed coupling and two gold clamps.
8. Drain the vent elbow remove the rubber plug from the vent-drain elbow side port. Plug the unused drip leg port by pushing the removed rubber plug into the 100 degree elbow; a blunt tool such as a 3/16 in Allen wrench helps it seat.
9. Clamp the radius end of hose #4 to the vent-drain elbow side port with a gold clamp.
10. Insert the factory 1/2 in PVC pipe into hose #4 and secure with a gold clamp.
11. Feed the non-grommet end of hose #5 through the back drain hole and insert a 100 degree elbow into it with a red clamp.
12. Cut a 4 in straight section from hose #4, discard the radius end, and join it between the 100 degree elbow and the PVC pipe with red clamps.
13. Connect the trap inlets to the hoses with silver clamps. The trap outlet must point to the original bottom of the furnace.
14. Secure the trap with the two sheet metal screws supplied in the cabinet.
15. Connect the field drain to the trap outlet per the field drain section.

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
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• Auxiliary limit switch open (blower compartment)