Allied Furnace: Install condensate trap and drain

Install condensate trap and drain on a Allied furnace: This covers setting up the condensate trap and drain line on the furnace. A high efficiency furnace makes condensate every cycle, and a trap or drain that is wrong will back up, leak onto the floor, or trip the pressure switch. Take your time to decide the routing before you glue anything. A trap that is not primed at startup can let flue gas escape through the drain, so do not skip that step.

Homeowner with a furnace problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: Upflow and horizontal installations

Common causes of install condensate trap and drain

• New installation or trap replacement
• Changing the drain side after relocating the furnace
• Cracked or leaking trap found during service
• Drain line without proper slope holding water back

How to fix install condensate trap and drain: step by step

1. Decide which side the condensate line exits, where the trap goes, and how much PVC is needed before cutting anything.
2. Remove the plug from the cold end header box and install a 1/2 in NPT male fitting. Use Teflon tape or pipe dope.
3. Install the trap cap over the clean-out opening at the base of the trap and secure it with a clamp.
4. Glue the PVC trap assembly and drain line. Keep the 1/4 in per ft downward slope to the drain.
5. Install the field-supplied vent on the trap assembly so it does not block service access.
6. Prime the trap before start-up so flue gas cannot pass through it.
7. After firing, watch the drain flow and check all joints for drips.

If the unit shows an error code, look it up: Allied Furnace codes

Models

92G1UH92G1UH0450892G1UH0451292G1UH0700892G1UH0701292G1UH0901292G1UH0901692G1UH1101692G1UH1102092G1UH1352095G1UHA93UHA95UH