FloAire HOT WATER COIL MODULE - Manual (Page 6)

FLUID IOM
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6. Proper clearance should be maintained between the coil and other structures such as the
fan, filter racks, transition areas, etc..
7. 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 hook-up 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 is 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 that should be
isolated and repaired. If the coil itself is found to be leaking, contact your local Heatcraft
representative. Unauthorized repair to the coil may void the coil’s warranty (see
Heatcraft’s warranty policy on back cover).
8. 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.
9. All field piping must be self supporting. System piping should be flexible enough to
allow for thermal expansion and contraction of the coil.
10. General piping diagrams can be found in Figure 1 - Horizontal Airflow and Figure 3 -
Vertical Airflow.
Figure 1 - Horizontal Airflow Diagram
Air Vent
Gate Valve
Tee
Vent Plug
Re
tur
n
Air F
low
Su
p
p
ly
Dirt Leg
Cap
Union
Drain Plug