Specifications

STEAM IOM
4
Installation
1. Carefully remove the coil from the shipping package to avoid damage to the finned surface area.
Damaged fins can be straightened using an appropriate fin comb.
2. Heatcraft recommends cleaning the coil with a commercially available coil cleaner prior to instal-
lation. Refer to Maintenance on Page 5 for cleaning recommendations.
3. Mount coil properly to insure positive condensate drainage. Refer to Mounting instructions Page
2.
4. Proper clearance should be maintained between the coil and other sturctures such as the fan,
filter racks, transition areas, etc.
5. Utilize vacuum breakers on each coil. Steam traps require a positive pressure differential to
force the condensate through the valve seat. If the coil’s pressure drops below atmospheric, the
pressure differential across the valve will be negative and the condensate will not drain. This
condition can lead to serious damage or failure of the coil due to freezing, water hammer and
corrosion. Refer to piping diagram for recommended placement. See Note 1 in Figure 3 - Steam
Coil Piping Diagram on Page 3.
6. Trap each coil separately. Differences in pressure from coil to coil can result in the backing-up
of condensate which will result in poor coil performance and possible damage.
7. Provide an air vent for each coil at its highest location. Luvata provides a 0.5” threaded vent
connection on the return manifold as a standard on all steam coils. Non-condensable gasses
present in the steam will collect in a coil and reduce its capacity. Therefore, it is necessary to
provide a means for the removal of these gasses. Also, these gasses can diffuse into the con-
densate forming byproducts, which can lead to severe corrosion. See Note 1 in Figure 3 - Steam
Coil Piping Diagram on Page 3.
8. Steam supply lines need to be drained of condensate. This can be accomplished by the use of
drip legs. This ensures that high quality steam enters the coil.
9. Condensate return piping should be the same size as the coil’s return connection from the coil
outlet to the steam trap.
10. Once installed, the coil should be pressurized to 100 psig with dry nitrogen or other suitable
gas. The coil should be left pressurized for a minimum of 10 minutes. If the coil holds the
pressure, the field connections can be considered leak free. If the pressure drops by 5 psig or
less, re-pressurize the coil and wait another 10 minutes. If the pressure drops again, there are
more than likely one or more small leaks, which should be located and repaired. Pressure losses
greater than 5 psig would indicate a larger leak, which should be isolated and repaired. Be sure
to check valves and fittings as potential sites for leakage or bleed.
11. All field brazing and welding should be performed using high quality materials and an inert gas
purge (such as nitrogen) to reduce oxidation of the internal surface of the coil.
12. All field piping must be self supporting. System piping should be flexible enough to allow for
thermal expansion and contraction of the coil. The use of flexible connections and/or swing joints
is recommended.
13. The coil along with the control valve and trap should be isolated by manual valves to allow for
servicing.
14. Refer to Figure 3 - Steam Coil Piping Diagram on Page 3 for general piping.
15. If you are unsure about any portion of the installation, contact your local steam specialist for as-
sistance. Failure to properly install the coil can result in irreparable damage to the coil as well
as other components in the system.
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