Heatcraft Refrigeration Products HCS - Manual (Page 4)

4
Air Foil
Fans
Forward
Curved Fans
Motor Mount
Heatcraft puts the motor inside the fan section cabinet. It is
mounted on a heavy gauge steel slide rail base. There are several
advantages with internal motor location. It eliminates the need for
a bulky belt guard. Another advantage is that Heatcraft balances
the factory mounted motor and drive components, which can
eliminate additional balancing at start-up.
Coil Section
Coil sections cover a wide range of heating and cooling
requirements. Side, top and bottom panels are 16 gauge mill
galvanized steel. All coil sections accommodate either small or
large face area coils.
The HCS coil section will hold 15 1/2" of coils and spacers. The
HCS section covers most applications. Use the HCL coil section
if the coil or access space is more than 15 1/2". (See page 38 for
maximum per model.)
Cooling coil sections have a drain pan with double wall
construction. Insulation is sandwiched between the outer panel
and the inner drain pan. The pans are heavy gauge mill galvanized
steel. Heatcraft welds the corners of the drain pans and puts drain
connections on both sides of the coil section for field convenience.
The coils sit in an upright position inside the coil section. The
air flows horizontally through the coils. Larger models (sizes 50
through 75) have cooling coils stacked two high.These larger
models come with an intermediate drain pan, so that condensate
from the upper coil does not flow over the lower coil.
Coils come in either small or large sizes (pages 42-43). A large
face area coil fills the total face area of the coil section. The
coil section’s total air volume passes through the large coil. A
small coil is shorter in height and does not fill the total face
height of the coil section. Air may bypass above the coil through
balance dampers or internal face and bypass dampers. With either
combination, it is possible to adjust and control the amount of air
passing through the small size coil.
Chilled water and direct expansion coil face velocities
over 550 FPM should be avoided--WATER CARRYOVER.
If desired, a blank off plate above the small coil can force total coil
section air volume through the small coil.
Basic Ca
Basic Cabinet
Consists of a fan section and a coil section with double wall drain
pan. The housing panels are die formed from mill galvanized steel
and insulated with 1" - 3/4 pound density mat faced fiberglass
insulation. All fan sections have hinged and latched access doors.
Unit below has fan and coil section.
Fans
All units have single, double width, double inlet fan
wheels for quiet performance and low energy consumption.
Single wheels eliminate the problem of unequal loading which is
characteristic of units with multiple wheels. Also, the expense of a
“pants” type duct connection is avoided. Sizes 03 through 41 units
have forward curved and size 50 through size 75 units have airfoil
fan as standard.
Bearings
Unit sizes 03 through 12 have lifetime lubricated fan bearings as
standard. Unit sizes 03 through 12 with optional medium pressure
fan have pillow block bearings rigidly supported on a heavy steel
frame. Unit sizes 14 through 75 have pillow block bearing rigidly
supported on a heavy steel frame as standard. The bearings are
self aligning and are selected for an average service life in excess
of 200,000 hours. There are extended lube lines and grease fittings
on the drive side of all units that have pillow block bearings. The
bearings on these models can be lubricated without opening the
blower section access door. Maximum operating temperature is
140°F.
Fan Shaft
The fan shaft is solid polished steel, and keyed for both fan and
drive. It is designed so that critical speed is at least 1.25 times the
maximum operating speed.
Standard Unit Features