I like some advice on whether I should install a Condensate Pump for my HVAV or just have a plumber directly connect it to my sewer line and use a trap to prevent sewer gas from entering my furnace install. I am having my entire cast iron sewer lines replace with PVC, so I need to decide on how to do this correctly.
Below is some background info on what I have now...
My current furnace setup has the A/C & Humidifier draining directly into my 2 inch cast iron sewer line which is under my crawl space. It has been like that for 35 years and has always worked. When this was first installed, the HVAC person:
(1) Connected the HVAC ¾ inch PVC to a ½ inch piece of copper pipe.
(2) He then bent the copper pipe to make a trap before it would enter my 2 inch cast iron sewer line. This 2 inch cast iron pipe is the drain for my laundry tub.
(3) He then drilled a hole into the 2 inch cast pipe and connected the ½ inch copper and added silicone caulk. FYI, the 2 inch cast iron pipe connects downstream to my 4 inch cast iron main sewer line.
What is the best method/correct way to drain my HVAV?