CLCH-SVX07C-EN 81
Coil Piping and Connections
Steam Coil Piping
Air handlers fitted with steam coils have labeled holes for piping penetrations. Figure 72 illustrates
a typical steam coil piping configuration. See Tab le 24 for the codes of system 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 24. Code of system components for piping figures
Code System component
FT Float and thermostatic steam trap
GV Gate valve
OV Automatic two-position (ON-OFF) control valve
VB Vacuum breaker
ST Strainer
AV Automatic or manual air vent
MV Modulating control valve
Figure 72. Typical piping for Type NS steam coils and horizontal tubes for horizontal airflow
Full size of
coil connection
ST
GV
MV
Steam main
Pitch down
VB
GV
Airflow
12 in. min.
FT
FT
ST
12 in. min.
Full
size
of
main
VB
GV
ST
FT
Return main
Full size of
steam trap
connection
ST
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