JOHNSON CONTROLS
96
FORM100.50-EG12 (918)
2.
IAQ Drain Pan:
The main coil drain pan shall be double-sloped stainless steel with
a condensate connection through the base rail of the unit. Clearance between the
evaporator coil and the drain pan shall allow for easy access to the drain pan for
cleaning, and shall be visible for inspection without the removal of components.
3.
Intermediate Drain Pan:
Coils with finned height greater than 48 inches shall have
an intermediate drain pan extending the entire finned length of the coil. The interme
-
diate pans shall have drop tubes to guide condensate to the main drain pan.
Supply Fan Section
1.
Fan:
The fan section shall be equipped with a single DWDI forward-curved [airfoil
optional on 70–85T but standard on 90–105T] centrifugal type wheels. An access
door shall be provided on both sides of the unit for fan/motor access.
a.
Mountings:
Fan and fan motor shall be internally mounted and isolated on a
full width isolator support channel using 1-inch [2-inch optional] springs [with
optional seismic restraints]. The fan discharge shall be connected to the fan
cabinet using a flexible connection to insure vibration-free operation.
b.
Bearings and Drives:
Fan bearings shall be self-aligning, pillow block or
flanged type regreaseable ball bearings and shall be designed for an average
life (L50) of at least 200,000 hours. All bearings shall be factory lubricated and
equipped with standard hydraulic grease fittings and lube lines extended to the
motor side of the fan. Fan drives shall be selected for a 1.5 service factor and
anti-static belts shall be furnished. All drives shall be fixed pitch. Fan shafts shall
be selected to operate well below the first critical speed and each shaft shall be
factory coated after assembly with an anti-corrosion coating.
c.
Optional VFD Manual Bypass:
A three contactor manual bypass shall be pro-
vided to permit replacement of the VFD in the event of a power failure.
2.
Direct Drive Plenum (DDP) Supply Fan:
The fan section shall be equipped with a
Single Width Single Inlet (SWSI) airfoil plenum wheel. Plenum fans shall be direct
drive. An access door shall be provided on both sides of the unit for fan/motor access.
a.
Mountings:
Fan and fan motor shall be internally mounted and isolated on a full
width isolator support channel using 1-inch springs [2-inch springs and seismic
restraints].
b.
Acoustiweir
™
:
Unit shall include a discharge air (DA) sound attenuation barrier.
The passive sound attenuator barrier shall be mounted on the downstream side
of the supply fan and shall block line-of-sight between the fan and the unit dis-
charge opening. If not available, manufacturer must provide a sound attenuator
of at least 3 feet in length.
c.
Thrust Restraints:
Provide horizontal thrust restraints between air handling
unit casing and fan housing.
d.
Seismic Snubber:
Unit shall be supplied with seismic snubbers on the SWSI
plenum fan.
e.
Supply Fan Airflow Measurement:
The SWSI supply fan shall be supplied with
an airflow measurement device. Airflow measurement device shall be ca¬pable
of measurement accuracy of +/-5%. Airflow measurement ring and trans¬ducer
shall be supplied for integration into a field-supplied controller.
f.
Fan Inlet Screen:
Unit shall be provided with a fan inlet screen.
Guide Specifications (Cont'd)
Содержание YPAL070
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