less than or equal to 0.05. Contractor shall provide and install a
complete charge of refrigerant for the installed system as recommended by
the manufacturer. Except for factory sealed units, two complete charges of
lubricating oil for each compressor crankcase shall be furnished. One
charge shall be used during the system performance testing period.
Following the satisfactory completion of the performance testing, the oil
shall be drained and replaced with a second charge. Lubricating oil shall
be of a type and grade recommended by the manufacturer for each compressor.
Where color leak indicator dye is incorporated, charge shall be in
accordance with manufacturer's recommendation.
2.10.2
Fans
Fan wheel shafts shall be supported by either maintenance-accessible
lubricated antifriction block-type bearings, or permanently lubricated ball
bearings. Unit fans shall be selected to produce the cfm required at the
fan total pressure. Motor starters, if applicable, shall be magnetic
across-the-line type with a [open] [dripproof] [totally enclosed]
[explosion proof] enclosure. Thermal overload protection shall be of the
manual or automatic-reset type. Fan wheels or propellers shall be
constructed of aluminum or galvanized steel. Centrifugal fan wheel
housings shall be of galvanized steel, and both centrifugal and propeller
fan casings shall be constructed of aluminum or galvanized steel. Steel
elements of fans, except fan shafts, shall be hot-dipped galvanized after
fabrication or fabricated of mill galvanized steel. Mill-galvanized steel
surfaces and edges damaged or cut during fabrication by forming, punching,
drilling, welding, or cutting shall be recoated with an approved zinc-rich
compound. Fan wheels or propellers shall be statically and dynamically
balanced. Forward curved fan wheels shall be limited to [_____] mm inches.
Direct-drive fan motors shall be of the multiple-speed variety.
Belt-driven fans shall have adjustable sheaves to provide not less than
[_____] percent fan-speed adjustment. The sheave size shall be selected so
that the fan speed at the approximate midpoint of the sheave adjustment
will produce the specified air quantity. Centrifugal scroll-type fans
shall be provided with streamlined orifice inlet and V-belt drive. Each
drive will be independent of any other drive. Propeller fans shall be
[direct-drive] [V-belt] drive type with [adjustable] [fixed] pitch blades.
V-belt driven fans shall be mounted on a corrosion protected drive shaft
supported by either maintenance-accessible lubricated antifriction
block-type bearings, or permanently lubricated ball bearings. Each drive
will be independent of any other drive. Drive bearings shall be protected
with water slingers or shields. V-belt drives shall be fitted with guards
where exposed to contact by personnel and [fixed pitch] [adjustable pitch]
sheaves.
2.10.3
Primary/Supplemental Heating
**************************************************************************
NOTE: Inapplicable types of heating coils will be
deleted. In some cases, unitary products are not
available with steam or water heating coils.
**************************************************************************
2.10.3.1
Water Coil
**************************************************************************
NOTE: Drainable coils will be specified where coils
are subject to freezing during the heating season.
If drainable coils are not required, delete the last
SECTION 15700A
Page 37
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