Installation
74 RT-SVX24J-EN
7. Install a “Gate” type valve in the supply branch line as
close as possible to the steam main and upstream of
any other device.
8. Install a “Gate” type valve in the return branch line as
close as possible to the
condensate return main and
downstream of any other device.
9. Install a strainer as close as possible to the inlet of the
control valve and steam trap(s).
1
0. Steam trap selection should be based on the
maximum possible condensate flow and
the
recommended load factors.
11. Install a Float-and-Thermostatic (FT) type trap to
maintain proper flow.They
provide gravity drains and
continuous discharge operation. FT type traps are
required if the system includes either;
a. an atmospheric pressure/gravity condensate
return;
or,
b. a potentially low
pressure steam supply.
12. Position the outlet or discharge port of the steam trap
at
least 12" below
the outlet connection on the coil(s).
This will provide adequate hydrostatic head pressure
to overcome the trap losses and assure complete
condensate removal.
The two steam coils are stacked together and must be
piped
in a parallel ar
rangement.The steps listed below
should be used in addition to the previous steps.
Figure 52, p. 75 illustrates the recommended piping
configuration for the steam coils.
13. Install a strainer in each return line before the steam
trap.
14. Trap each steam coil separately as described in steps
10 and 11
to prevent condensate backup in one or both
coils.
15. In order to prevent condensate backup in the piping
header supplying both coil sections,
a drain must be
installed utilizing a strainer and a steam trap as
illustrated in Figure 52, p. 75.
Figure 50. Hot water and steam heat connection location
T
able 20. Hot w
ater and steam coil connection sizes
Hot Water Coil Steam Coil
Unit
Size Supply Return
Drain/
Vent Supply Return Vent
90-162
Ton
2 ½ 2 ½ ½ 3.0 1 ¼ 1 ¼
Notes:
1. Type W coils, with center offset headers, are used in Hot Water units;
Type NS coils are used in Steam units.
2. Hot water and Steam units have multiple headers.
3. All sizes are in inches.
4. All connection threads are internal.
Table 21. Hot water and steam heat connection
dimensions
Tons A B Y Diameter
90-118 276 9/16 290 5/16 18 5
120-162 341 5/16 355 1/16 18 5
A
B
Y
Supply Air Opening
Return Air Opening
Unit bottom view
Inlet
Outlet
Recommended
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