Installation
Drain Pan Trapping
Threaded condensate drain connections are provided on only one side of the coil module. Pitch the connection lines horizontal or downward toward an open drain. Trane recommends installing a plug to facilitate cleaning of the trap.
Figure 26 illustrates the proper trapping, piping, and operation of the trap for negative pressure modules. Use the formula under the figure to determine the correct minimum depth for the condensate trap.
Figure 27 illustrates the proper trapping, piping, and operation of the trap for positive pressure modules.
CAUTION
Water Damage!
When more than one module has a drain pan, trap each module individually. Connecting all drains to a common line with only one trap may result in condensate retention and possible water damage to the air handler or adjoining space.
Figure 26. Drain pan trapping for module under negative pressure
L = H + J + pipe diameter where:
H = 1 inch for each inch of negative pressure* plus 1 inch J = 1/2 H
*Negative pressure=total unit static pressure at worst case (loaded filters) minus external pressure
Figure 27. Drain pan trapping for module under positive pressure
K = 1/2 inch (minimum)
H = 1/2 inch plus the total unit static pressure at worst case (loaded filters)
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