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Installation and Maintenance 31
Figure 26
Drain Pan Trapping for Section under Negative Pressure
Figure 27
Drain Pan Trapping for Section under Positive Pressure
Negative Pressure Section
Trap the drain pan as illustrated in
Figure 26
, which
also illustrates the proper piping as well as the
operation of the trap. Use the formula given in
Figure
26
to determine the correct minimum depth for the
condensate trap.
Positive Pressure Section
The positive pressure section requires a different
design than the negative pressure trap. Refer to
Figure 27
and the formula provided to determine the
minimum trap depth.
3C - Normal Operation
L
H
J
H= (1" for each 1" of
maximum negative
static pressure) + 1"
J= half of H
L= H + J + Pipe Diameter + Insulation
H = (1” for each 1” of maximum negative
pressure) + 1”
J = 1/2 H
L = H + J + Pipe Diameter + Insulation
Normal Operation
H
J
L
K
2C - Normal Operation
H
K= min. 1/2"
H= 1/2" plus maximum
total static pressure
K = min. 1/2”
H = 1/2” plus maximum total static
pressure
K
H