SECTION 15686

ABSORPTION WATER CHILLERS

PART 1 GENERAL

SECTION INCLUDES

Chiller package.

Charge of refrigerant and oil.

Controls and control connections.

Chilled water connections.

Condenser water connections.

Heating water connections.

Steam and steam condensate connections.

Auxiliary water connections.

Starters.

Electrical power connections.

PRODUCTS FURNISHED BUT NOT INSTALLED UNDER THIS SECTION

Section 15973 - Pneumatic Controls: Placement of condenser water temperature controller.

RELATED SECTIONS

Section 15170 - Motors.

Section 15242 - Vibration Isolation.

Section 15260 - Piping Insulation.

Section 15510 - Hydronic Piping.

Section 15520 - Steam and Steam Condensate Piping.

Section 15540 - HVAC Pumps.

Section 15712 - Induced Draft Cooling Tower.

Section 15714 - Blow Thru Cooling Tower.

Section 15716 - Ejector Cooling Tower.

Section 15985 - Sequence of Operation.

Section 15990 - Testing, Adjusting, and Balancing.

Section 16180 - Equipment Wiring Systems.

ALTERNATES

This Section is based on specific selections of equipment which are related to equipment in Section 15540 [, Section 15712] [, Section 15714] [, Section 15716] [, Section 15952]. When choosing alternative equipment, manufactured by others acceptable for this project, ensure that performance criteria matches that specified or is revised to suit.

REFERENCES

ARI 560 - Absorption Water Chilling Packages.

ANSI/ASME SEC 8 - Boiler and Pressure Vessel Code.

ANSI/ASHRAE 15 - Safety Code for Mechanical Refrigeration.

ANSI/ASHRAE 90A - Energy Conservation in New Building Design.

ANSI/NEMA 250 - Enclosures for Electrical Equipment (1000 volts maximum).

ANSI/NEMA MG 1 - Motors and Generators.

ANSI/UL 465 - Central Cooling Air Conditioners.

SUBMITTALS

Submit under provisions of Section [01300.] [_____.]

Shop Drawings: Indicate components, assembly, dimensions, weights and loadings, required clearances, and location and size of field connections. Indicate equipment, piping and connections, valves, strainers, and thermostatic valves required for a complete system.

Product Data: Provide data on capacities, weights, specialties and accessories, electrical requirements and wiring diagrams.

Manufacturer's Installation Instructions: Indicate rigging, installation, and start-up procedures.

Manufacturer's Certificate: Certify that components furnished but not produced by manufacturer meet or exceed manufacturer's requirements.

Manufacturer's Performance Data: Indicate energy input versus cooling load output from 0 to 100 percent of full load[.] [at specified and minimum condenser water temperature.]

OPERATION AND MAINTENANCE DATA

Submit under provisions of Section [01700.] [_____.]

Include start-up instructions, maintenance data, parts lists, controls, and accessories. Include trouble-shooting guide.

QUALIFICATIONS

Manufacturer: Company specializing in manufacturing the products specified in this Section with minimum [three] [_____] years [documented] experience.

REGULATORY REQUIREMENTS

Conform to ARI 560 code for testing and rating of absorption chillers.

Conform to ANSI/UL 465 code for construction of absorption chillers[.] [and provide UL label.]

Conform to ANSI/ASME SEC 8 Boiler and Pressure Vessel Code for construction and testing of absorption chillers.

Conform to ANSI/ASHRAE 15 code for construction and operation of absorption chillers.

Provide certification of inspection for conforming [authority having jurisdiction] [___________] approval.

DELIVERY, STORAGE, AND HANDLING

Deliver, store, protect and handle products to site under provisions of Section [01600.] [_____.]

Comply with manufacturers installation instructions for rigging, unloading, and transporting units.

Protect units from physical damage. Leave factory shipping covers in place until installation.

WARRANTY

Provide [two] [five] [_____] year warranty under provisions of Section [01700.] [_____.]

Warranty: Include coverage for [complete package as manufactured and delivered to site] [_______________] including [materials] [and] [labor][.] [only.]

MAINTENANCE SERVICE

Furnish service and maintenance of chillers for [one] [two] [five] [_____] years from Date of Substantial Completion.

Include labor and materials required for routine servicing and maintenance as recommended in manufacturer's published operating and maintenance data.

EXTRA MATERIALS

Furnish under provisions of Section [01700.] [_____.]

Provide [two] [_____] of [____________________.]

PART 2 PRODUCTS

MANUFACTURERS

[__________________________________] Model [___________.]

[__________________________________] Model [___________.]

[__________________________________] Model [___________.]

Substitutions: Under provisions of Section [01600.] [_____.]

MANUFACTURED UNITS

Description: Factory assembled and tested, packaged, water cooled, liquid chillers, consisting of absorber-evaporator assembly, solution heat exchanger, solution and refrigeration pumps, interconnecting piping, refrigeration accessories, instrument and control panel including gages and indicating lights, auxiliary components and accessories, motor starters, and construction and ratings in accordance with ARI 560.

Ratings: Energy Efficiency Rating (EER) not less than prescribed by ASHRAE 90A.

Performance:

Minimum capacity of [_____] tons ([_____] kW) of refrigeration.

Chilled Water: [_____] gpm ([_____] L/sec) entering at [_____] degrees F ([_____] degrees C), leaving at [_____] degrees F ([_____] degrees C).

Condenser Water: [_____] gpm ([_____] L/sec) entering at [_____] degrees F ([_____] degrees C) leaving at [_____] degrees F ([_____] degrees C).

Hot Water: [_____] gpm ([_____] L/sec) entering at [_____] degrees F ([_____] degrees C) leaving at [_____] degrees F ([_____] degrees C).

Saturated Steam: [_____] lb/hr ([_____] kg/hr) at [_____] psi ([_____] kPa) and [_____] degrees F ([_____] degrees C).

Fouling Factor: [0.0005] [_____] for evaporator and [0.0005] [_____] for absorber-condenser.

Evaporator Head Loss: [_____] ft ([_____] kPa) maximum.

Absorber Condenser Head Loss: [_____] ft ([_____] kPa) maximum.

Minimum Working Pressure: 150 psi (1 034 kPa) for absorber, condenser and evaporator. Test at 1.5 times maximum working pressure.

Model: [__________] manufactured by [_______________.]

PUMPS

Self-contained hermetically sealed centrifugal solution and refrigerant pumps, separate or on common shaft, lubricated and cooled by lithium bromide refrigerant.

HEAT EXCHANGERS

Shell and tube type, seamless or welded steel construction in one or two shells with cast iron or welded steel heads.

Absorber, concentrator, and evaporator tubes of cupro-nickel.

Condenser tubes of seamless copper, rolled or silver brazed to tube sheets.

Water Boxes: Machine welded to heat exchanger with tapped drain and vent connections, flanged or mechanical joint piping connections, flanged and bolted covers arranged to permit inspection and replacement.

[Factory] [Field] insulate evaporator and cold surfaces with [0.75] [_____] inch ([20] [_____] mm) minimum thick flexible [expanded polyvinyl chloride] insulation with maximum K value of [0.28.] [0.26.]

Provide thermometer wells for temperature controller and low temperature cutout.

Construction and Material: Conform to ANSI B9.1 and ASME Boiler and Pressure Vessel Code.

Design steam space of concentrator for 50 psi (345 kPa) minimum working pressure. Test at 1.5 times maximum working pressure.

Design hot water space of concentrator for 250 psi (1 724 kPa) minimum working pressure. Test at 1.5 times maximum working pressure.

PURGE SYSTEM

Automatically or manually purge unit of non-condensibles, storing them external to unit.

AUTOMATIC DECRYSTALLIZATION

Automatic cycle using lithium bromide solution to prevent crystallization while machine is running or at power failure shut-down.

CONTROLS

Electric Control Panels: ANSI/NEMA 250, Type 1; factory wired and mounted panel that includes:

Terminal block.

Control transformer and separately fused control circuit.

Motor temperature cutout and low temperate cutout.

Time delay relay for dilution cycle.

Motor starters.

Purge motor fuse.

External lights to indicate operation of unit, pumps, and purge system.

Pneumatic Capacity Control Panel: Factory assembled and mounted panel that includes:

Chilled water temperature controller.

Condenser water temperature controller.

Pneumatic-electric pressure switch.

Solenoid air valve.

Pneumatic temperature gage.

Supply air pressure gage.

Branch air pressure gage.

Optional start-up demand limiter or start-up stabilizer.

Optional part-load economizer switch.

[Steam] [Hot water] Control Valve: Normally closed pneumatic with demand limiter to slow rate at which valve opens to minimum of five minute cycles.

Solution Throttling Device: To increase part load economy and assure operation to 10 percent specified full load capacity, at 55 degrees F (13 degrees C) entering condenser water temperature.

PART 3 EXECUTION

INSTALLATION

Install in accordance with manufacturer's instructions.

Provide for connection to electrical service. Refer to [Section 15952.] [Section 16180.]

Align chiller on concrete foundations and sole plates. Level and grout in place.

Install units on vibration isolation. Refer to Section 15252.

Provide evaporator connections to chilled water piping. Refer to Section 15510. On inlet, provide [thermometer well for temperature controller,] [thermometer well and thermometer,] [strainer,] [nipple and flow switch,] [flexible pipe connector,] [pressure gage,] and shut-off valve. On outlet, provide [thermometer well and thermometer,] [flexible pipe connector,] [pressure gage,] and [shut-off] [balancing] valve.

Provide hot water connections to hot water piping. Refer to Section 15510. On inlet, provide [thermometer well for temperature limit controller,] [thermometer well and thermometer,] [strainer,] [nipple and flow switch,] [flexible pipe connector,] [pressure gage,and shut-off valve. On outlet, provide [thermometer well and thermometer,] [flexible pipe connector,] [pressure gage,] and [shut-off] [balancing] valve.

Provide steam connections to steam piping. Refer to Section 15520. On inlet, provide [thermometer well for temperature limit controller,] [thermometer well and thermometer,] [strainer,] [nipple and flow switch,] [flexible pipe connector,] [pressure gage,] and shut-off valve. On outlet, provide [thermometer well and thermometer,] [flexible pipe connector,] [pressure gage,] [strainer,] [steam traps,] and [shut-off] [balancing] valve.

Provide condenser connections to condenser water piping. Refer to Section 15510. On inlet, provide [thermometer well for temperature limit controller,] [thermometer well and thermometer,] [strainer,] [nipple and flow switch,] [flexible pipe connector,] [pressure gage,] and shut-off valve. On outlet, provide [thermometer well and thermometer,] [flexible pipe connector,] [pressure gage,] and [shut-off] [balancing] valve.

Insulate evaporator and cold surfaces. Refer to Section 15620.

Arrange piping for easy dismantling to permit tube cleaning.

MANUFACTURER'S FIELD SERVICES

Prepare and start systems under provisions of Section [01400.] [_____.]

Provide services of factory trained representative for minimum [one] [_____] day to supervise leak test, refrigerant pressure test, evacuate, dehydrate, charge, start-up, calibrate controls, and instruct Owner on operation and maintenance.

Test for leaks under pressure and evacuate and dehydrate at 35 degrees F (2 degrees C) wet bulb or absolute pressure of not over 0.24 inches (0.82 kPa) of mercury.

Upon completion of installation, and within 60 days after initial operation, conduct performance tests in presence of Owner. Test minimum 8 hours. Correct equipment defects or performance deficiencies and repeat. Determine water flows from pressure drop across chiller, condenser, concentrator, and from pump curves. Provide calibrated test instruments.

ADJUSTING

Adjust work under provisions of Section [01700.] [_____.]

Supply initial charge of lithium bromide. Adjust concentration to recommended levels.

DEMONSTRATION

Provide systems demonstration under provisions of Section [01650.] [_____.]

Demonstrate system operation and verify specified performance. Refer to Section 15990.

SCHEDULES

Drawing_Code	ACH_1	ACH-2	ACH-3

Location

Manufacturer

Model Number

Cooling Capacity

Refrigerant

Unit EER

Evaporator

Water Flow

Entering Water Temp

Leaving Water Temp

Pressure Drop

Fouling Factor

Condenser

Water Flow

Entering Water Temp

Leaving Water Temp

Pressure Drop

Fouling Factor

Concentrator

Water Flow

Entering Water Temp

Leaving Water Temp

Steam Flow

Entering Steam Pressure

Pressure Drop

Fouling Factor

Overall Size

Length

Width

Height

Weight

END OF SECTION