50
T-Series Climate Changer Air Handler IOM •
CLCH-SVX06A-EN
Installation - Piping
Drain Pan Trapping
WARNING
No Step Surface!
Do not walk on the sheet metal drain pan. Walking on the drain pan could cause the
supporting metal to collapse. Failure of the drain pan could result in death or serious
injury.
Threaded condensate drain connections are provided on only one side of the coil section.
Pitch the connection lines horizontal or downward toward an open drain. Trane
recommends installing a plug to facilitate cleaning of the trap.
The drain connection size is 1-inch NPT (national pipe threads) external for unit sizes
3 to 30; 1 1/4-inch NPT external for unit sizes 35, 40, 50, and 57; and 1 1/2-inch internal
threads on sizes 66, 80, 100, and 120.
Figure 36
illustrates the proper trapping, piping, and operation of the trap for negative
pressure sections. Use the formula under the figure to determine the correct minimum
depth for the condensate trap.
Figure 37
illustrates the proper trapping, piping, and operation of the trap for positive
pressure sections.
Note: Positive pressure traps require a different design than negative pressure traps.
If a section has a drain pan for cleaning purposes only, it does not need a trap; however,
a cap or shutoff valve should be installed on the drain connection. Only sections handling
condensate, such as a cooling coil section or moisture eliminator section, require a trap.
CAUTION
Water Damage!
When more than one section has a drain pain, trap each section individually.
Connecting all drains to a common line with only one trap can result in condensate
retention and possible water damage to the air handler or adjoining space.
