Specifications - State of Delaware

SECTION 237314 - INDOOR DEDICATED OUTSIDE AIR UNITS: continued
F. Internal Vibration Isolation: Fans shall be factory mounted with manufacturer's
standard restrained vibration isolation mounting devices having a minimum static deflection of
2 inches.
G. Motor: Comply with NEMA designation, temperature rating, service factor, enclosure type,
and efficiency requirements for motors specified in SECTION 230513 - MOTORS.
1. Enclosure Type: Totally enclosed, fan cooled.
2. NEMA Premium (TM) efficient motors as defined in NEMA MG 1.
3. Motor Sizes: Minimum size as indicated. If not indicated, large enough so driven load
will not require motor to operate in service factor range above 1.0.
4. Controllers, Electrical Devices, and Wiring: Comply with requirements for electrical
devices and connections specified in DIVISION 26.
5. Mount unit-mounted disconnect switches on exterior of unit.
H. Variable Frequency Controllers: Shall be provided by DIVISION 26.
2.04 COIL SECTION:
A. General Requirements for Coil Section:
1. Comply with ARI 410.
2. Fabricate coil section to allow removal and replacement of coil for maintenance and to
allow in-place access for service and maintenance of coil(s).
3. Coils shall not act as structural component of unit.
B. Refrigerant Coils: Coil designed for use with R-410A refrigerant, fabricated according to
ARI 410, connected with soldered fittings.
1. Capacity Reduction: Circuit for face control. Front to back split interlace.
2. Tubes: Copper.
3. Fins: Aluminum.
4. Fin and Tube Joint: Mechanical bond a silver brazed.
5. Coil Coating: Polymer e-coated cooling coil.
6. Suction and Distributor: Seamless copper tube with brazed joints.
7. Frames: Galvanized-steel channel frame, 0.052 inch.
8. Ratings: Design tested and rated according to ASHRAE 33 and ARI 410.
a. Working-Pressure Rating: 300 psig.
9. Source Quality Control: Test to 450 psig and 300 psig underwater.
2.05 WATER-SOURCE HEAT PUMP SECTION:
A. Refrigerant-to-Water Heat Exchanger:
1. Coaxial heat exchanger with copper water tube with enhanced heat-transfer surfaces
inside a steel shell; both shell and tube leak tested to 450 psig on refrigerant side and
400 psig on water side. Factory mount heat exchanger in unit on resilient rubber
vibration isolators.
2. Refrigerant Circuit Components:
a. Sealed Refrigerant Circuit: Charge with R-410A refrigerant. Minimum of
2 circuits required. Intertwine circuits in refrigerant to air coil.
b. Charging Connections: Service fittings on suction and liquid for charging and
testing on each circuit.
c. Reversing Valve: Pilot-operated sliding-type valve designed to be fail-safe in
heating position with replaceable magnetic coil.
d. Compressor: Hermetic scroll compressors installed on vibration isolators housed in
an acoustically treated enclosure with factory-installed safeties as follows:
(1) Antirecycle timer.
DEAN237314.DOC 237314-5