substitution request - Alliance Construction Solutions

B. Construction shall be modular, consisting of removable panels with permanently affixed
fasteners. Base pans shall be formed out of a minimum of 16 gauge G90 galvanized steel with
floor mounting support channels. The condensate drain pan under the evaporator shall be epoxy
coated galvanized steel. The compressor and controls shall be located in a compartment out of
the air stream. Surfaces adjacent to the coil compartment shall be insulated with insulation to
prevent condensation.
C. The unit shall be of horizontal design. The supply air discharge shall be horizontal.
D. Hinged Access Doors shall be provided at the openings for Compressor, Electrical Panel,
Blowers, Motors and Drives. Doors shall be double-wall, insulated, mounted on a continuous
piano hinge, secured with latches and sealed against a rigid steel frame with hollow-bulb rubber
gasket material.
2.4 COMPRESSOR
A. The compressor shall be high-efficiency scroll type operating at scheduled voltage, phase, and
frequency.
B. The suction gas cooled compressor shall be equipped with thermal overload protection and a
crankcase heater to prevent refrigerant migration to the compressor oil during shutdown.
C. Provide a compressor sound jacket consisting of reinforced vinyl sewn around a 2 pound density
fiberglass blanket to provide acoustical attenuation.
2.5 FILTER RACK AND FILTERS
A. The dehumidification unit shall include a weather tight air filter section with a duct flange and
access door for side loading of filters. The filters shall be Class II, two inch, throw away.
2.6 REFRIGERANT
A. The refrigerant shall be R-410A.
2.7 FAN
A. The fan shall be a forward-curved, centrifugal blower. The wheel shall be dynamically balanced
and installed on a steel shaft. The blower scroll and housing shall be constructed of cold-rolled
steel, coated with an electrostatically applied acrylic enamel paint or G90 galvanized steel.
B. The fan shall operate at the scheduled supply air CFM, outside air CFM (if equipped with this
option) and W.C. external static pressure (ESP).
2.8 FAN MOTOR
A. The class B winding fan motor shall be belt drive. The motor shall comply with the efficiency
requirements of EPACT-92. The belt drive assembly shall include a single “A” or “B” section belt
and an adjustable motor sheave or double “B” section belt and non-adjustable motor sheave
Project No.: 10145
550 15 th Street Dual Brand Hotel
03/16/2012
23 8416 - 4 MECHANICAL DEHUMIDIFICATION
UNITS