Steam Coil Piping - Trane Performance Climate Changer UCCA Series Installation, Operation And Maintenance Manual

Figure 44. Drain pan trapping for negative and positive pressure applications
Section 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

Steam Coil Piping

Air handlers fitted with steam coils have labeled holes for
piping penetrations. Figure 45
piping configuration. See Table 9
components in these figures.
The coil condensate return line must be piped full size of the
condensate trap connection, except for a short nipple screwed
directly into the coil header's condensate return tapping. Do
not bush or reduce the coil return trapping size.
Table 9. Code of system components for piping figures
Code
FT Float and thermostatic steam trap
GV
OV Automatic two-position (ON-OFF) control valve
VB
ST
AV Automatic or manual air vent
MV
CLCH-SVX009L-EN
L
illustrates a typical steam coil
for the codes of system
System component
Gate valve
Vacuum breaker
Strainer
Modulating control valve
Coil Piping and Connections
Section under positive pressure
L = H + J + pipe diameter where:
H = 1/2 inch (minimum)
J = 1/2 inch plus the unit positive
static pressure at coil discharge
(loaded filters)
Figure 45. Typical piping for Type NS steam coils and
horizontal tubes for horizontal airflow
FT
FT
H
J
GV
MV
ST
VB
GV
Full size
of coil
connection
VB
GV
ST
ST
Full size
of main
FT
ST
Full size of
steam trap
connection
39