Condensate Drain Design - Mechanical & Plumbing Code

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Uniform Mechanical Code
M1411.3 Condensate disposal. Condensate from all cooling coils or evaporators shall be
conveyed from the drain pan outlet to an approved place of disposal. Condensate shall not
discharge into a street, alley or other areas so as to cause a nuisance.
Unform Plumbing Code
9.1.10 Air Conditioning Equipment. Where condensate or other drainage from air
conditioning or cooling equipment discharges to a drainage system it shall discharge indirectly
to a trapped and vented receptor through an air break or air gap. EXCEPTION: An air break
shall not be permitted where the drain connects to a point in the air conditioning equipment
that operates at a pressure below atmospheric
9.3 INDIRECT WASTE RECEPTORS
9.3.1. General (snip)Exceptions: (snip)(2) In a dwelling unit, a laundry sink, provided that an
air gap is maintained for any potable clear-water waste shall be an acceptable receptor for:
a. Air conditioning condensate.(3) A service sink or mop basin shall be an acceptable receptor
for air conditioning condensate and any infrequent potable clear-water waste if the required
air gap is provided for potable clear-water wastes.
9.3.3 Prohibited Locations
Receptors for indirect wastes shall not be located in a toilet room or in any confined,
concealed, inaccessible, or unventilated space.
EXCEPTION: Air conditioning condensate in dwellings shall be permitted to drain to a tub
waste and overflow or lavatory tailpiece in accordance with Section 9.4.3.c.5.
9.43 Air Conditioning Condensate
(snip)C. Discharge of air conditioning condensate shall not be permitted to create a nuisance
such as by flowing across the ground or paved surfaces. Unless expressly prohibited by the
Authority Having Jurisdiction, the point of indirect discharge for air conditioning condensate
shall be one of the following:
1. The building sanitary drainage system.
2. The building storm drainage system.
3. A sump pump.
4. A subsurface absorption pit or trench.
5. Within dwellings, a tub waste and overflow or lavatory tailpiece within the same dwelling. 

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