9
CONDENSATE DRAIN LINES
CONDENSATE DRAIN LINE PIPING — SINGLE UNIT
It is the installers responsibility to ensure that all drain line piping is installed in accordance with local and national plumbing
codes.
Drain line piping runs should be kept as short as possible within the conditioned space whenever possible.
Pitch all field piping in the direction of flow a
minimum
of 1/4” per foot of pipe run.
Use an approved pipe thread sealant on the threads of the drain line fitting.
DO NOT OVER
-
TIGHTEN THE FITTING
ATTACHED DIRECTLY TO THE DRAIN PAN CONNECTION!
Install a P-trap in all unit drain lines. Traps in freezer drain lines should be located outside the freezer whenever possible.
The use of plastic (PVC) pipe is acceptable only on cooler applications operating above freezing.
For all freezer applications (+32 degrees and lower) use copper pipe only.
Use an insertion type drain line heater on all freezer applications or wrap all piping and P-traps exposed to freezing temperatures
with self regulating type heat tape and insulate wherever practical. A
minimum
of 20 watts / foot of drain line is generally recom-
mended for freezers operating down to 0 degrees and 30 watts / foot of drain line for those operating from 0 down to -20 de-
grees.
Common drain lines serving multiple units (whether in the same space or different rooms) must be adequately sized to handle the
condensate flow from
ALL
connected evaporators.
DO NOT REDUCE THE DRAIN LINE PIPE SIZE SMALLER THAN THE
CONNECTION ON THE DRAIN PAN!
The branch lines from each individual evaporator must also be separately trapped.
All drain lines must terminate above an open floor drain or in an outdoor area where the condensate will not pose any personal
safety or environmental issues. Do not connect drain lines directly to the building sewer system.
Check the unit drain pan after an initial period of operation to ensure there is no standing water in the pan. Check unit for level or
correct field piping if necessary to eliminate standing water.
CONDENSATE DRAIN LINE PIPING — MULTIPLE UNITS ON A COMMON DRAIN LINE
P-Trap
Open Floor Drain
UNIT 1
UNIT 2
P-Trap
UNIT 3
Pitch In Direction Of Flow - 1/4" / Foot (MINIMUM))
P-Trap
Air Flow
P-Trap
Floor
COOLER (Above +32)
Open
Drain
FREEZER (Below +32)
Air Flow
P-Trap
Floor
COOLER (Above +32)
Drain
Open
Units which are located in different rooms but piped to a com-
mon drain line must be individually trapped.
Units operating near or below freezing should be trapped out-
side the room or adequately protected from freezing.
