COILS, FITTINGS, AND FINS
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Depending on the application, most DX cooling coils have a
counterflow design; the entering air face is the suction face of the coil. Most
chilled water coils are also a counterflow design; the chilled water supply
header will be on the inlet air face.
Hot water coils that are one or two rows are called
bidirectional coils. They can be installed as a left- or right-hand coil. On
hot water coils that have three or more rows, the entering air face is the hot
water return face.
Standard steam coils are “header position critical”; that
is, the condensate return connection point must be the low point of the coil.
These steam coils should never have more than two rows. If the original coil
has three or more rows, a design/application error has occurred. Contact your
sales rep or the factory for guidance.
Mechanical fittings (female pipe threads, or FPTs; male pipe
threads, or MPTs; and unions) require some type of flexible sealant. A
high-quality pipe dope, Teflon® tape, or a combination of the two is
recommended.
Over time, it is not uncommon for joints to become loose due
to vibration and/or thermal expansion and contraction. Always use a back-up wrench
when tightening a mechanical fitting.
On sweat fittings, it is best to use a minimum 5 percent
silver solder. Tin/lead solder should be avoided.
Regarding fins, minor fin damage during installation is
normal. Fins can be straightened using a fin comb.