HVAC Procedure and Performance Guide

TASK: Install evaporator condensate drain

Training for this procedure can be found in these courses:

                         131 – Oil Heat l  and  161 – Boilers l


Evaporator condensate drain must be installed according to manufacturer’s specifications and job specifications.  Drain must remove all condensate from evaporator and must contain a trap to prevent air leakage into or out of evaporator.  It must be pitched to drain and must not leak.  Condensate drain must discharge to an open-trap drain or suitable drainage area and must not be connected directly to a closed drain line.  Applicable safety procedures must be followed.


    1. Review manufacturer’s specifications and job specifications.
    2. Collect tools, equipment and materials.
    3. Put on safety and protective equipment and apparel.
    4. Determine size and routing for drain.  (Note:  Drain may discharge to an open-trap drain (floor drain) or open drainage area.  Drain must not connect directly to a closed drain line).
    5. Determine type of piping and select correct joints.
    6. Make up drain line suctions, including trap.
    7. Install drain sections between evaporator pan outlet and drain with trap positioned as closely as possible to evaporator outlet.
    8. Secure piping.
    9. Test line for leaks.
    10. Retighten or remake joints if line leaks.
    11. Remove safety and protective equipment and apparel.
    12. Gather tools, equipment and leftover materials, and leave work site clean.