8
Shown below are typical configurations depicting proper piping practices. Do not use smaller pipe sizes than
what the connections are on the supplied control valve. Take steam supply from the top of supply main-never
from the side or bottom. See Steam Pipe Capacities tables on Page 12.
Expansion and Contraction. With average length of supply line, the dimension change from hot to cold
should not exceed 2". Provide piping with (3) 90° elbows to obtain swing to take care of expansion and
contraction.
Figure 8-3. If the supply steam to the control valve exceeds the control
valve pressure rating, an Armstrong pressure reducing valve may need
to be installed after the Y strainer as shown.
Figure 8-1. Typical runout less than 30 feet long.
Figure 8-4. Piping when more than one Humidi-
Pack or HumidiPackPlus is fed from the same
steam runout.
Control Valve. The Armstrong control valve is installed in the steam supply line after the Y strainer and
supplies steam to the header of the HumidiPack/HumidiPackPlus panel. The steam supply connection on the
top of the HumidiPack/HumidiPackPlus header is either 1" NPT or
2" NPT. The control valve connection size may be different. In these cases, reduce from the 2" connection
on the HumidiPack/HumidiPackPlus header down to the Armstrong control valve size by bushing the 2"
HumidiPack/HumidiPackPlus connection.
Piping of air supply to pneumatic control valves are discussed in Figures 9-1, 9-2 and
9-3 while wiring for electric control vales is discussed in Figure 10-1. For more installation information of
Armstrong Control Valves, see Installation Bulletin IB-58.
Step 6: Install Armstrong Float & Thermostatic Steam Trap(s)
a) HumidiPack
The connection on the bottom of the HumidiPack header is for condensate drainage. The supplied Arm-
strong Float & Thermostatic steam trap should be piped from this connection as illustrated in Figure 4-1.
Make sure a distance of 6" - 12" is maintained between the top of the F&T trap and the bottom of the
HumidiPack header. A second connection is used for HumidiPack CF and the same guidelines should be
followed.
b) HumidiPackPlus
The connection on the bottom of the HumidiPackPlus header is for condensate drainage and one of the
supplied Armstrong Float & Thermostatic steam traps should be installed in this location as shown in Figure
6-2. Make sure a distance of 6" - 12" is maintained between the top of the F&T trap and the bottom of the
HumidiPackPlus header. The second supplied Armstrong Float & Thermostatic steam trap should be
installed at the active tube jacketing drain connection as illustrated in Figure 6-2.
Figure 8-2. Typical long runout of 30 feet or more.
Steam Main
Trap
Armstrong
Strainer
Armstrong AC
Control Valve
To HumidiPack
Header
Dirt Leg
Run Out
Condensate Return
or Drain
Steam Main
To Condensate
Return/Drain
Run Out
Trap
To Strainer
Control Valve
HumidiPack Heade
Steam Main
If More Than
10'
10' Minimum
Strainer
Trap
Strainer
Blowdown
Connection
To Control Valve
HumidiPack Heade
PRV Is
Single Seated,
Dead End Type
Steam Main
Run Out
Armstrong Straine
Condensate Return
or Drain
Trap
Dirt Leg
Armstrong ACV
Control Valve
To HumidiPack
Header
The discharge pressure from the steam traps is at essentially atmospheric pressure. Thus, the condensate
must be discharged to a suitable drain, or a condensate pump. It cannot be connected to an overhead return
without pumping.
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