Daikin OAC 003G Installation And Maintenance Manual page 13

Figure 21: Piping Arrangements
Float and
thermostatic trap
Vacuum breaker
1/2" check valve
1/4" petcock
1"
for continuous
min.
air venting
12" min.
5GA or 8GA coils. Note that the
addition of a vacuum brea ker to
permit the coil to drain during
shutdown.
5J, 5G, 8J or 8G coils.
Steam main
Vacuum breaker
1/2" check valve
Return main
5RA, 8RA, or 5SA coils. Installed
Daikin IM 777-7
Check Valve Strainer
High Pressure (over 25 psi)
Steam main
High pressure
float or bucket
trap
Return main
Low Pressure (to 25 psi)
Steam main
Vacuum breaker
1/2" check valve
12" min.
5JA or 8JA coil. Installed in series.
Note that each coil must have a
separate control valve and trap.
12" min.
Full size of
return conn.
Mechanical Installation
Control valve
modulating
Gate Valve
two position
Vacuum breaker
1/2" check valve
Return main
1/4" petcock
for continuous
air venting
1" min.
12" min.
High pressure
bucket trap
5TA, 8TA, or 5HA coils. Conden-
sate is lif ted to overhead return
main
Steam main
Vacuum breaker
1/2" check valve
Return main
Return main
5RA, 8RA, or 5SA coils. Banked two
high, individual trapping of each coil as
shown is preferred.
Steam main
Full size of
return conn.
13