HVAC condensate drain
HVAC condensate drain
(OP)
I recently design an AHU above ceiling unit with a condensate pump located in the emergency drip/overflow pan. The contracter left me a comment stating that whenever possible the condenstation from the HVAC equipment should be a gravity flow drain and not rely on mechanical means for discharge. He recommended using a hub drain with a trap primer under a near by sink instead. I see know that this may be a better option but I wanted to get a second opinion, or see if anybody else had a better option.





RE: HVAC condensate drain
The rational being that any non-metered water cannot connect to the sewage treatment plant.
PS: Not a good idea to locate a condensate pump inside a drain pan, you are not likely to get positive drainage from the coil. How would you handle water form the drain pan with the pump inside the pan? Locate your condensate pump outside the drain pan and below the unit.
The utility company may let you connect the emergency drain pan to the sink. Check it out.
RE: HVAC condensate drain
RE: HVAC condensate drain
Agree with CHW/HW/CW that they should not connect to the storm for they contain chemicals. CHW/HW/CW are also all METERED water and therefore can go back to their originating point, while Condensate from the air is not metered and is not contaminated with chemicals.
IMC 307 calls for connection to an approved place of disposal, IMC's way of dumping the responsibility on the local authority and the Engineer.
That is the way we handle it over here, and any time we connect cooling coil condensate to the sanitary, we get a code review comment.
Overflow from secondary drain pan: Yes, Condensate from Cooling coil: No.
You can have a secondary drain pan without a drain pipe if you have a water level detection device conforming to UL 508 (IMC 307.2.3.)
RE: HVAC condensate drain
RE: HVAC condensate drain
RE: HVAC condensate drain
RE: HVAC condensate drain
RE: HVAC condensate drain
To specifically answer your question on how to set it up. Make sure you have sufficient space and clearance to maintain the necessary slope and that it is trapped properly. The termination will be determined by the AHJ.