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4. Drain Piping
The indoor units have field supplied primary and secondary 3/4-in. NPT drain connections.
When making drain fitting connections to the drain pan, use a thin layer of Teflon paste, Silicone or Teflon tape
and install by hand tightening.
When making drain fitting connections to drain pan, do not over-tighten.
All horizontal drain pipes must be pitched downward away from the unit a minimum of 1/8¨per foot to provide
free drainage.
Do not connect the drain pipes directly to sewage pipes to avoid any odor. Ammonia in the sewage may enter
the indoor unit through the drain pipe and corrode the heat exchanger. Do not twist or bend the drain hose.
Excessive force applied during twisting or bending may cause leakage.
The drain line should be insulated where necessary to prevent sweating and damage due to condensate
forming on the outside surface of the pipe. Test condensate drain pan and drain pipe after installation is
complete. Keep the cabinet horizontal (horizontal left or horizontal right) to ensure smooth drainage, or incline
the case 0.5° to the drainage hole, making it the lowest point for draining. Pour water into drain pan, enough
to fill drain trap and line. Check to make sure drain pan is draining completely, no leaks are found in drain pipe
fittings, and water is draining from the termination of the primary drain pipe.
NOTES:
If unit is located in or above a living space where damage may result from condensate overflow, a field-sup-
plied, external condensate pan should be installed underneath the entire unit, and a secondary condensate
line (with appropriate trap) should be run from the unit into the pan. Any condensate in this external conden-
sate pan should be drained to a noticeable place. The owner of the structure must be informed that when
condensate flows from the secondary drain or external condensate pan, the unit requires servicing or water
damage will occur. Install traps in the condensate lines as close to the coil as possible.
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