Do Mortuary Coolers Need a Drain Line? Condensate Drainage Explained

One of the most common pre-purchase questions on upright mortuary coolers: do I need a drain line? The answer: sometimes — it depends on your cabinet model, indoor humidity, run time, and site conditions.

Cabinet model matters

P1 cabinet models include a 5/8″ external condensate drain line and do not evaporate condensate internally — the drain must be connected properly. P2 and P3 cabinets include an internal re-evaporation pan beneath the compressor; in normal cold-storage conditions the pan evaporates coil condensate with no external drain required.

When high humidity changes the answer

In high indoor humidity or extended run-time applications, the re-evaporation pan can overflow. For those installations, the indoor PRO³ includes a 3/4″ NPT external drain connection that should be routed to a suitable remote drain via a field-supplied condensate pump or external drain line. Southern and Gulf-region facilities — Florida, Texas, Louisiana — should plan for this at install.

P-traps and freeze protection

Add water to the condensate drain line at startup to establish the liquid seal in the P-trap. If a drain line runs through freezing conditions, it must be adequately sloped and equipped with a heated trace wire. Outdoor units always require a field-piped drain line.

Whose responsibility is it?

Drainage, condensate routing, P-trap preparation, code compliance, and site readiness are the responsibility of the purchaser, installer, facility owner, plumber, or HVAC/R contractor unless included in writing by AMC. Improper drainage is not a product defect and is not a warranty claim. Full details, official manuals, and the complete drainage notice live on our Packaged Refrigeration Manuals & Startup Guide.