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Installation
CAH-SVX01A-EN 29
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
Figure 27. Drain pan trapping for module under positive 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
K = 1/2 inch (minimum)
H = 1/2 inch plus the total unit static pressure at worst case (loaded filters)