SECTION 15671 AIR-COOLED CONDENSING UNITS

This spec was part of the Des Plaines, IL River WRF project that bid Feb 26, 2015.


SECTION 15671
AIR-COOLED CONDENSING UNITS

PART 1 - GENERAL

1.1 SUMMARY

A. This section includes packaged, air-cooled condensing units for outdoor installation.

1.2 SUBMITTALS

A. Product Data: For each air-cooled condensing units, include rated capacities, operating characteristics, furnished specialties, and accessories. Include equipment dimensions, weights and structural loads, required clearances, method of field assembly, compo- nents, and location and size of each field connection.

B. Operation and Maintenance Data: For air-cooled condensers to include in emergency, operation, and maintenance manuals.

1.3 QUALITY ASSURANCE

A. Product Options: Drawings indicate size, profiles, and dimensional requirements of air-cooled condensers and are based on the specific system indicated. Refer to Divi- sion 1 Section "Product Requirements."

B. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, Article 100, by a testing agency acceptable to authorities having jurisdiction, and marked for intended use.

C. Fabricate and label refrigeration system according to ASHRAE 15, "Safety Code for Mechanical Refrigeration."

1.4 COORDINATION

A. Coordinate size and location of concrete bases. Cast anchor-bolt inserts into bases. Concrete, reinforcement, and formwork requirements are specified in Division 3.

B. Coordinate location of refrigerant piping and electrical rough-ins.


PART 2 - PRODUCTS

2.1 MANUFACTURERS

A. Manufacturers: Subject to compliance with requirements, provide products by one of the following (Note: manufacturer shall match the furnace units)
1. Trane Co. (The); Worldwide Applied Systems Group.
2. Carrier Corporation; Carrier Air Conditioning Div.

2.2 GENERAL - SPLIT SYSTEM COOLING

A. Fully charged from the factory for matched indoor section and up to 15 feet of piping. Unit designed to operate at outdoor ambient temperatures as high as 115 deg F.
1. A.R.I certified.
2. UL listed.
3. Exterior must be designed for outdoor application.

B. Description: Factory assembled and tested; consisting of casing, condenser coils, con- denser fans and motors, and unit controls.

C. Refrigerant:  R-410A


2.3 SPLIT SYSTEM COOLING UNIT CASING

A. Unit casing constructed of heavy gauge, galvanized steel and painted with a weather- resistant powder paint.

B. Corrosion and weatherproof CMBP-G30 Duratuff base.


2.4 SPLIT SYSTEM COOLING COMPRESSOR

A. Compressor to have internal over temperature and pressure protector, total dipped her- metic motor and thermostatically controlled sump heater.

B. Also include: roto-lock suction and discharge refrigeration connections, centrifugal oil pump, and low vibration and noise.

C. Compressor to have a 5-year limited warranty.


2.5 SPLIT SYSTEM COOLING CONDENSER COIL & FANS

A. The Fin coil is continuously wrapped, corrosion resistant, all copper tubes & aluminum fins with minimum brazed joints. The coil is 3/8" O.D. seamless copper or aluminum glued to a continuous fin.

B. Condensing Fans and Drives: Propeller fans with aluminum or galvanized-steel fan blades, for vertical air discharge; directly driven with permanently lubricated ball- bearing motors with integral current- and thermal-overload protection.

C. Coils are lab tested to withstand 2,000 pounds of pressure per square inch. Coil to be protected on all four sides by louvered panels.

D. Coil to have a 1 year warranty.

2.6 SPLIT SYSTEM COOLING REFRIGERANT CONTROLS

A. Operating and Safety Controls: Include condenser fan motor thermal and overload cut- outs; 115-V control transformer, if required; magnetic contactors for condenser fan mo- tors and a nonfused factory-mounted and -wired disconnect switch for single external electrical power connection.

B. High and low pressure protection to be inherent to the compressor.

C. Provide a factory installed liquid line drier.

2.7 COOLING LOW AMBIENT & FROST CONTROL

A. Provide unit with cooling capability to 55 deg. F, plus the addition of an evaporator de- frost control to permit operation to 40 deg. F.


PART 3 - EXECUTION

3.1 EXAMINATION

A. Examine substrates, areas, and conditions, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of air-cooled condensers.

B. Examine roughing-in for refrigerant piping systems to verify actual locations of piping connections before equipment installation.

C. Proceed with installation only after unsatisfactory conditions have been corrected.

3.2 INSTALLATION

A. Install units level and plumb, firmly anchored in locations indicated; maintain manufac- turer's recommended clearances.

B. Install air-cooled condensers on concrete base.

C. Maintain manufacturer's recommended clearances for service and maintenance.

D. Loose Components:  Install electrical components, devices, and accessories that are not factory mounted.

3.3 CONNECTIONS

A. Piping installation requirements are specified in other Division 15 sections.  Drawings indicate general arrangement of piping, fittings, and specialties.

B. Install piping adjacent to machine to allow service and maintenance.

C. Refrigerant Piping:   Connect piping to unit with pressure relief, service valve, filter- dryer, and moisture indicator on each refrigerant-circuit liquid line.

D. Ground equipment according to Division 16 "Grounding and Bonding for Electrical Systems."

E. Connect wiring according to Division 16 "Low-Voltage Electrical Power for Conduc- tors and Cables."

3.4 FIELD QUALITY CONTROL

A. Perform the following field tests and inspections and prepare test reports:

1. Perform electrical test and visual and mechanical inspection.

2. Leak Test:  After installation, charge system and test for leaks.  Repair leaks and retest until no leaks exist.

3. Operational Test: After electrical circuitry has been energized, start units to con- firm proper motor rotation and unit operation. Complete manufacturer's starting checklist.

4. Test and adjust controls and safeties.  Replace damaged and malfunctioning con- trols and equipment.

5. Verify proper airflow over coils.

B. Remove  and  replace  malfunctioning  air-cooled  condensers  and  retest  as  specified above.

3.5 STARTUP SERVICE

A. Complete installation and startup checks according to manufacturer's written instruc- tions and perform the following:

1. Inspect for physical damage to unit casing.

2. Verify that access doors move freely and are weathertight.

3. Clean units and inspect for construction debris.

4. Verify that all bolts and screws are tight.

5. Verify that controls are connected and operational.

B. Lubricate bearings on fans.

C. Verify that fan wheel is rotating in the correct direction and is not vibrating or binding.

D. Start unit according to manufacturer's written instructions and complete manufacturer's startup checklist.

E. Verify proper operation of capacity control device.

F. After startup and performance test, lubricate bearings.


END OF SECTION