Specifications_-_Replace_Communications_Room_HVAC_System.pdf

Specifications: Replace Communications Room HVAC System

Section Specialty Page Number

Section 15515 Hydronic Specialties Page 1

Section 15535 Refrigerant Piping And Specialties Page 4

Section 15742 Air-Cooled Refrigerant Condensers Page 14

Section 15785 Computer Room Air Conditioning Units Page 18

Section 15790 Air Coils Page 23 mlstewart Reviewed

ALASKA FIRE SERVICE BUILDING Section 15515 Hydronic Specialties

PART 1 GENERAL

1.01 SECTION INCLUDES

A. Expansion tanks.

B. Air vents.

C. Pump suction fittings.

D. Glycol specialties.

1.02 RELATED SECTIONS

A. Section 15430 Plumbing Specialties: Backflow Preventers.

B. Section 15510 Hydronic Piping.

1.03 REFERENCES: Reserved

1.04 SUBMITTALS

A. Submit under provisions of Division 1 and Section 15010.

B. Product Data: Provide product data for manufactured products and assemblies required for project. Include component sizes, rough in requirements, service sizes, and finishes.

Include product description, model and dimensions.

C. Manufacturer's Installation Instructions: Indicate hanging and support methods, joining procedures.

1.05 OPERATION AND MAINTENANCE DATA

A. Maintenance Data: Include installation instructions, assembly views, lubrication instructions, and replacement parts list.

1.06 QUALIFICATIONS Company specializing in manufacturing the Products specified in this section with minimum three years experience.

Section 15515

1.07 DELIVERY, STORAGE, AND HANDLING

A. Accept valves in shipping containers w/ labeling in place. Inspect for damage.

B. Provide temporary protective coating on cast iron and steel valves.

C. Provide temporary end caps and closures on piping and fittings until installation.

D. Protect piping systems from entry of foreign materials by temporary covers, completing sections of the work, and isolating parts of completed system.

PART 2 PRODUCTS

2.01 DIAPHRAGM TYPE EXPANSION TANKS

A. Manufacturers:

1. Amtrol.

2. Bell & Gossett.

3. Taco.

B. Construction: Welded steel, tested & stamped in accordance w/ ASME SEC 8 D supplied with National Board Form U 1, rated for working pressure of 125 psig, with flexible butyl diaphragm sealed into tank.

C. Accessory: Pressure gage & air charging fitting, tank drain; precharge to 12 psig

2.02 AIR VENTS

A. Furnish air vents designed for 75 psi operating pressure, 200 psig maximum hydrostatic pressure, intended for use in hot or cold lines.

B. For glycol systems: Valmatic 1" with No. 22 stainless steel trim, or Metraflex MV-30 only.

2.03 STRAINERS

A. Size 2 " and Under:

1. Screwed brass or iron body for 175 psig working pressure, Y pattern with 1/32" stainless steel perforated screen.

B. Size 2 1/2" to 4": Flanged iron body for 175 psig working pressure, Y pattern with 3/64" stainless steel perforated screen.

C. Size 5" & Larger: Flanged iron body for 175 psig working pressure, basket pattern w/ 1/8" stainless steel perforated screen.

2.04 PUMP SUCTION FITTINGS

A. Fitting: Angle pattern, cast iron body, threaded for 2" & smaller, flanged for 2 ½" & larger, rated for 175 psig working pressure, with inlet vanes, cylinder strainer with 3/16" diameter openings, disposable fine mesh strainer to fit over cylinder strainer, and permanent magnet located in flow stream and removable for cleaning.

B. Accessories: Adjustable foot support, blowdown tapping in bottom, gage tapping in side.

2.05 GLYCOL SYSTEM: Inhibited propylene glycol and water solution mixed 60% glycol – 40% water, suitable for operating temperatures from 500 to 2500 F.

PART 3 EXECUTION

3.01 INSTALLATION

A. Install specialties in accordance with manufacturer's instructions.

B. Where large air quantities can accumulate, provide enlarged air collection standpipes.

C. Provide manual air vents at system high points and as indicated.

D. For automatic air vents in ceiling spaces or other concealed locations, provide vent tubing to nearest drain.

E. Provide air separator on suction side of system circulation pump and connect to expansion tank.

F. Provide valved drain and hose connection on strainer blow down connection.

G. Provide pump suction fitting on suction side of centrifugal pumps where indicated.

Remove temporary strainers after cleaning systems.

H. Support pump fittings with floor mounted pipe and flange supports.

I. Provide relief valves on pressure tanks, low pressure side of reducing valves, heat exchangers, and expansion tanks.

J. Select system relief valve capacity so that it is greater than make up pressure reducing valve capacity. Select equipment relief valve capacity to exceed rating of connected equipment.

K. Pipe relief valve outlet to nearest floor drain.

L. Where one line vents several relief valves, make cross sectional area equal to sum of individual vent areas.

M. Clean and flush glycol system before adding glycol solution.

N. Feed glycol solution to system through make up line with pressure regulator, venting system high points. Set to fill at 12 psig.

O. Perform tests determining strength of glycol and water solution and submit written test results.

---------------- END OF SECTION --------------------

ALASKA FIRE SERVICE BUILDING SECTION 15535

Refrigerant Piping and Specialties

PART 1) GENERAL

i) Piping.

ii) Refrigerant.

iii) Moisture and liquid indicators.

iv) Valves.

v) Strainers.

vi) Check valves.

vii) Pressure relief valves. 4

SECTION 15535

viii) Solenoid valves.

ix) Expansion valves.

x) Receivers.

xi) Flexible connections.

xii) ASME B31.9 Building Services Piping.

xiii) ASME SEC 8D Boilers and Pressure Vessels Code, Pressure Vessel Construction Rules.

xiv) ASTM A53 Pipe, Steel, Black & Hot Dipped, Zinc Coated, Welded & Seamless

xv) ASTM A234 Pipe Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and

Elevated Temperatures.

xvi) ASTM B88 Seamless Copper Water Tube.

xvii) ASTM B280 Seamless Copper Tube for Air Conditioning and Refrigeration Field Service.

xviii) ASTM F708 Design and Installation of Rigid Pipe Hangers.

xix) AWS A5.8 Brazing Filler Metal.

xx) AWS D1.1 Structural Welding Code, Steel.

xxi) MSS SP58 Pipe Hangers and Supports; Materials, Design and Manufacturer.

xxii) MSS SP69 Pipe Hangers and Supports Selection and Application.

xxiii) MSS SP89 Pipe Hangers & Supports and Fabrication & Installation Practices.

xxiv) UL 429 Electrically Operated Valves.

1.02 RELATED SECTIONS

A. Section 09900 Painting.

B. Section 15260 Piping Insulation.

C. Section 15671 Air Cooled Condensing Units.

D. Section 15785 Computer Room Air Conditioning Units.

E. Section 15790 Air Coils.

1.03 REFERENCES

A. ARI 495 Refrigerant Liquid Receivers.

B. ARI 710 Liquid Line Dryers.

C. ARI 730 Flow Capacity Rating and Application of Suction Line Filters and Filter Driers

D. ARI 750 Thermostatic Refrigerant Expansion Valves.

E. ARI 760 Solenoid Valves for Use With Volatile Refrigerants.

F. ASHRAE 15 Safety Code for Mechanical Refrigeration.

G. ASHRAE 34 Number Designation of Refrigerants.

H. ASME Boiler and Pressure Vessel Codes, SEC 9 Qualification Standard for Welding and Brazing Procedures, Welders, Brazers, and Welding and Brazing Operators.

I. ASME B16.22 Wrought Copper & Copper Alloy Solder Joint Pressure Fittings

J. ASME B16.26 Cast Copper Alloy Fittings For Flared Copper Tubes.

K. ASME B31.5 Refrigeration Piping.

1.04 SYSTEM DESCRIPTION

A. Where more than one piping material is specified ensure components are compatible and joined to ensure the integrity of the system is not jeopardized. Provide all joining fittings. Ensure flanges, union, and couplings for servicing are consistently provided.

B. Provide pipe hangers & supports in accordance w/ MSS SP69 unless indicated otherwise

C. Liquid Indicators:

1. Use line size liquid indicators in main liquid line leaving condenser.

2. If receiver is provided, install in liquid line leaving receiver.

3. Use line size on leaving side of liquid solenoid valves.

D. Valves

1. Use service valves on suction and discharge of compressors.

2. Use gage taps at compressor inlet and outlet.

3. Use gage taps at hot gas bypass regulators, inlet and outlet.

4. Use check valves on compressor discharge.

5. Use check valves on condenser liquid lines on multiple condenser systems.

E. Refrigerant Charging (Packed Angle) Valve: Use in liquid line between receiver shut off valve and expansion valve.

F. Strainers:

1. Use line size strainer upstream of each automatic valve.

2. Where multiple expansion valves with integral strainers are used, use single main liquid line strainer.

3. On steel piping systems, use strainer in suction line.

4. Use shut off valve on each side of strainer.

G. Pressure Relief Valves: Use on ASME receivers and pipe to outdoors.

H. Permanent Filter Driers:

1. Use in low temperature systems.

2. Use in systems utilizing hermetic compressors.

3. Use filter driers for each solenoid valve.

I. Replaceable Cartridge Filter Driers:

1. Use vertically in liquid line adjacent to receivers.

2. Use filter driers for each solenoid valve.

J. Solenoid Valves:

1. Use in liquid line of systems operating with single pump out or pump down compressor control.

2. Use in liquid line of single or multiple evaporator systems.

3. Use in oil bleeder lines from flooded evaporators to stop flow of oil and refrigerant into the suction line when system shuts down.

K. Flexible Connectors: Utilize where piping configuration does not absorb vibration.

1.05 SUBMITTALS

A. Submit under provisions of Division 1 and Section 15010.

B. Shop Drawings: System layout schematic, includes equipment, dimensions, & sizes.

C. Product Data: Provide assembly of specialties; include manufacturer catalogue information. Provide manufacturers catalog data including load capacity.

D. Design Data: Submit design data indicating pipe sizing. Indicate load carrying capacity of trapeze, multiple pipe, and riser support hangers.

E. Test Reports: Indicate results of leak test, acid test.

F. Manufacturer's Installation Instructions: Indicate support, connection requirements, and isolation for servicing.

G. Submit welders certification of compliance with ASME SEC 9.

1.06 PROJECT RECORD DOCUMENTS: Record equipment & accessories locations on drawings.

1.07 OPERATION AND MAINTENANCE DATA

Maintenance Data: Include instructions for changing cartridges, assembly views, spare parts lists.

1.08 QUALIFICATIONS: Minimum 3 years experience performing the work of this section.

1.09 REGULATORY REQUIREMENTS

A. Conform to ASME B31.9 for installation of piping system.

B. Welding Materials & Procedures: Conform to ASME SEC 9 and state labor regulations.

C. Welders Certification: In accordance with ASME SEC 9. 8

D. Products Requiring Electrical Connection: Listed and classified by UL, as suitable for the purpose indicated.

1.10 DELIVERY, STORAGE, AND HANDLING

i) Deliver & store piping & specialties in shipping containers w/ labeling in place.

ii) Protect piping and specialties from entry of contaminating material by leaving end caps and plugs in place until installation.

PART 2) PRODUCTS

2.01 PIPING

i) Copper Tubing: ASTM B280, Type ACR hard drawn .

(1) Fittings: ASME B16.22 wrought copper.

(2) Joints: Braze, AWS A5.8 BCuP silver/phosphorus/copper alloy with melting range

1190 to 1480 degrees F.

ii) Copper Tubing to 7/8 inch OD: ASTM B88, Type K, annealed.

(1) Fittings: ASME B16.26 cast copper.

(2) Joints: Flared.

2.02 REFRIGERANT: Refrigerant: ASHRAE 34; R 22: Monochlorodifluoromethane.

2.03 MOISTURE AND LIQUID INDICATORS

Indicators: Double port type, UL listed, with copper or brass body, flared or solder ends, sight glass, color coded paper moisture indicator with removable element cartridge and plastic cap;

for maximum working pressure of 500 psig, and maximum temperature of 200 degrees F.

2.04 VALVES

A. Diaphragm Packless Valves: UL listed, globe or angle pattern, forged brass body and bonnet, phosphor bronze and stainless steel diaphragms, rising stem and handwheel, stainless steel spring, nylon seat disc, solder or flared ends, with positive backseating; for maximum working pressure of 500 psig and maximum temperature of 275 degrees F.

B. Packed Angle Valves: Forged brass, forged brass seal caps with copper gasket, rising stem and seat [with backseating], molded stem packing, solder or flared ends; for max working pressure of 500 psig & 2750 F max temp

a. Ball Valves: Two piece forged brass body with teflon ball seals and copper tube extensions, brass seal cap, chrome plated ball, stem with neoprene ring stem seals; for maximum working pressure of 500 psig and maximum temperature of 3000F.

b. Service Valves: Forged brass body with copper stubs, brass caps, removable valve core, integral ball check valve, flared or solder ends, for 500 psig max pressure.

2.05 STRAINERS: Straight Line or Angle Line Type: Brass or steel shell, steel cap and flange, & replaceable cartridge, w/ screen of stainless steel wire or monel reinforced w brass; for max working pressure of 430 psig.

2.06 CHECK VALVES

A. Globe Type: Cast bronze or forged brass body, forged brass cap with neoprene seal, brass guide and disc holder, phosphor bronze or stainless steel spring, teflon seat disc; for max working pressure of 500 psig and maximum temperature of 3000F.

B. Straight Through Type: Brass body and disc, phosphor bronze or stainless steel spring, neoprene seat; for max working pressure of 500 psig and 2500F maximum temp.

2.07 PRESSURE REGULATOR: Brass body, stainless steel diaphragm, pilot operated w/ remote pressure pilot, adjustable over 0 to 80 psig range, for 450 psig max working pressure.

2.08 PRESSURE RELIEF VALVES : Straight Through or Angle Type: Brass body and disc, neoprene seat, factory sealed and stamped with ASME UV and National Board

Certification NB; for standard 450 psig setting; selected to ASHRAE 15.

2.09 SOLENOID VALVES:

A. ARI 760, pilot operated, copper or brass [or steel] body and internal parts, synthetic seat, stainless steel stem and plunger assembly, [integral strainer,] w/ flared, solder, or threaded ends; for maximum working pressure of 500 psig. Stem shall permit manual operation in case of coil failure. 10

B. Coil Assembly: UL 429, UL listed, replaceable w/ molded electromagnetic coil, moisture

& fungus proof, w/ surge protector, colour coded lead wires, integral junction box w/ pilot light.

2.10 EXPANSION VALVES

A. Angle or Straight Through Type: ARI 750; design suitable for refrigerant, brass body, internal or external equalizer, bleed hole, adjustable superheat setting, replaceable inlet strainer, with replaceable capillary tube and remote sensing bulb and remote bulb well.

B. Selection: Evaluate refrigerant pressure drop through system to determine available pressure drop across valve. Select valve for max load at design operating pressure & minimum

100F superheat. Avoid being undersized at full load & oversized at part load.

2.11 ELECTRONIC EXPANSION VALVES

A. Valve: Brass body with flared or solder connection, needle valve with floating needle and machined seat, stepper motor drive.

B. Evaporation Control System: Electronic microprocessor based unit in enclosed case, proportional integral control with adaptive superheat, max operating pressure function, preselection allowance for electrical defrost and hot gas bypass.

C. Refrigeration System Control: Electronic microprocessor based unit in enclosed case, with proportional integral control of valve, on/off thermostat, air temperature alarm (high and low), solenoid valve control, liquid injection adaptive superheat control, maximum operating pressure function, night set back thermostat, timer for defrost control.

2.12 RECEIVERS

i) Internal Diameter 6 inch and Smaller: ARI 495, UL listed, steel, brazed; 400 psig maximum pressure rating, with tappings for inlet, outlet, and pressure relief valve.

ii) Internal Diameter Over 6 inch: ARI 495, welded steel, tested & stamped in accordance w/ ASME SEC 8D; 400 psig w tappings for liquid inlet & outlet valves, pressure relief valve

2.13 REFRIGERANT LEAK DETECTOR

A. Provide refrigerant sensitive infrared based stationary refrigerant gas leak monitor system designed to measure the level of multiple refrigerant gas compounds in multiple monitoring areas. The monitor shall be a multiple area, self contained wall mounted device, recommended for eye level installation with remote air probes located in the air flow path of the area where refrigerant gases are most likely to concentrate. Monitoring system shall support compliance with ANSI/BSR ASHRAE 15-1994.

1. The monitor shall be able of being programmed per application for R-22, with the alarm setpoint being 200 ppm, & a spill setpoint of 300 ppm.

2. The monitor shall be infrared non-dispersive detection type, R-22 factory calibrated

3. The monitor shall adhere to a temperature drift tolerance of 0.3% per degree C and have a sensitivity of 1 ppm.

4. Sampling: continuous w/ 5 to 90 second response time,depending on the sampling tube length and gas concentration per area measured.

5. The monitor shall be equipped w/ 3-relays, indicator lights, & digital readout.

Standard RS-232C datalink communications port shall be standard with each gas monitoring unit. Contact terminal for RS-232C interface with DB25 connector port shall be standard.

6. Two alarm levels shall be provided for "alarm" & "spill" conditions. Thresholds for both alarms shall be field adjustable w/ a factory setting of 200 ppm for "alarm" & 300 ppm for "spills". Unit exposure levels shall be in compliance w/ ASHRAE Safety Code 34-1992

7. There shall be 3 relays in the monitoring unit. 3 relays shall be available for customer connections. All relays shall be rated at 120 VAC at 5 AAC.

(a) ALARM: Alarm relay connection shall support an audible & visual warning device.

This relay will energize in the event that an area's alarm level has been exceeded.

b) FAULT: The fault relay is provided for an external indicator in the event unit malfunction or failure occurs. If an alarm indicator is attached, normally open to common, the alarm will be activated for system fault or malfunction.

c) SPILL: A spill relay connection is provided for addition of audible / visual warnings device (provided as part of monitor). Relay energizes when spill level is exceeded.

8. Programmed access to be denied by key lockout to prevent unauthorized personnel from disabling device.

9. Unit shall operate even though a fault occurs. A fault indicator light shall provide operator with indication of a system fault.

10. The refrigerant monitor shall be ETL listed & conform to UL 3101.1.

PART 3) EXECUTION

3.01 PREPARATION

i) Ream pipe and tube ends. Remove burrs. Bevel plain end ferrous pipe.

ii) Remove scale and dirt on inside and outside before assembly.

iii) Prepare piping connections to equipment with flanges or unions.

3.02 INSTALLATION

A. Install refrigeration specialties in accordance with manufacturer's instructions.

B. Neatly route pipe, w/ plumbing parallel to building structure; maintain gradient.

C. Install piping to conserve building space and not interfere with use of space.

iv) Group piping whenever practical at common elevations and locations. Slope piping one percent in direction of oil return.

v) Install piping to allow for expansion and contraction without stressing pipe, joints, or connected equipment.

vi) Inserts:

(1) Provide inserts for placement in concrete formwork.

(2) Provide inserts for suspending hangers from reinforced concrete slabs and sides of reinforced concrete beams.

(3) Provide hooked rod to reinforced section for inserts carrying pipe over 4".

(4) Where concrete slabs form finished ceiling, locate inserts flush with slab surface.

vii) Pipe Hangers and Supports:

(1) Install in accordance with ASME B31.5, ASTM F708 and MSS SP89. 13

(2) Support horizontal piping as scheduled.

(3) Install hangers with min. ½" space between finished covering & adjacent work.

(4) Place hangers within 12 inches of each horizontal elbow.

(5) Support vertical piping at every floor. Support riser piping independently of connected horizontal piping.

(6) Where several pipes can be installed in parallel and at same elevation, provide multiple or trapeze hangers.

(7) Provide copper plated hangers and supports for copper piping.

viii) Arrange piping to return oil to compressor. Provide traps and loops in piping, and provide double risers as required. Slope horizontal piping 0.40 percent in direction of flow.

ix) Provide clearance for installation of insulation & access to valves and fittings

x) Provide access to concealed valves and fittings.

xi) Flood piping system with nitrogen when brazing.

xii) Where pipe support members are welded to structural building frame, brush clean, and apply one coat of zinc rich primer to welding.

xiii) Prepare unfinished pipe, fittings, supports, and accessories ready for finish painting.

xiv) Insulate piping.

xv) Follow ASHRAE 15 procedure: Charging & purging systems and to dispose of refrigerant.

xvi) Provide replaceable cartridge filter driers, w/ isolation valves & valved bypass

vii) Locate expansion valve sensing bulb downstream of evaporator on suction line.

xviii) Provide external equalizer pipe on expansion valves w/refrigerant distributor connected to the evaporator.

xix) Install flex connects at right angles to axial movement of compressor, parallel to crankshaft.

xx) Fully charge completed system with refrigerant after testing.

xxi) Provide electrical connection to solenoid valves.

3.03 FIELD QUALITY CONTROL

A. Test refrigeration system in accordance with ASME B31.5.

B. Pressure test system with dry nitrogen to 200 psig. Perform final tests at 27" of vacuum and 200 psig using electronic leak detector. Test to no leakage.

-------------------- END OF SECTION ------------------

ALASKA FIRE SERVICE BUILDING Section 15742

Air-Cooled Refrigerant Condensers

PART 1 GENERAL

A. Refrigerant condenser package.

B. Charge of refrigerant and oil.

C. Controls and control connections.

D. Refrigerant piping and connections.

E. Motor starters.

F. Electrical power connections.

1.02 RELATED SECTIONS

A. Section 15245 - Vibration Isolation.

B. Section 15535 - Refrigeration Piping and Specialties.

C. Section 15790 - Air Coils.

D. Division 16 - Electrical.

Section 15742

1.03 REFERENCES

A. ARI 210/240 - Unitary Air Conditioning and Air-Source Heat Pump Equipment.

B. ASHRAE 15 - Safety Code for Mechanical Refrigeration.

C. ASHRAE 20 - Methods of Testing for Rating Remote Mechanical Air-Cooled

Refrigerant Condensers.

D. ASHRAE 90A - Energy Conservation in New Building Design.

E. NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum).

F. UL 207 - Refrigerant-Containing Components and Accessories, Non-electrical.

G. UL303 – Refrigeration & Air-Conditioning Condensing and Compressor Units.

1.04 SUBMITTALS FOR REVIEW

A. Submit under provisions of Division 1 and Section 15010.

B. Shop Drawings: Indicate components, assembly, dimensions, weights and loading, required clearances, and location and size of field connections. Include schematic layout showing condenser, compressors, coils, piping & accessories for complete system.

C. Product Data: Provide rated capacities, weights, accessories, electrical requirements, and wiring diagrams.

1.05 SUBMITTALS FOR INFORMATION

A. Submit under provisions of Division 1 and Section 15010.

B. Submit manufacturer's installation instructions.

1.06 SUBMITTALS AT PROJECT CLOSEOUT

A. Operation & Maintenance Data: Include start-up instructions, maintenance instructions, parts lists, controls, and accessories.

1.07 QUALITY ASSURANCE

A. Manufacturer Qualifications: Company specializing in manufacturing Products specified in this section with minimum three years experience.

B. Installer Qualifications: Company specializing in performing the work of this section with minimum three years experience.

1.08 REGULATORY REQUIREMENTS: Products Requiring Electrical Connection: Listed & classified by Underwriters Laboratories Inc., as suitable for specified purpose as indicated

1.09 DELIVERY, STORAGE, AND PROTECTION

A. Comply with manufacturer's instruction for rigging, unloading & transporting units.

B. Protect units on site from physical damage. Protect coils.

PART 2 PRODUCTS

2.01 MANUFACTURERS

- Acceptable Manufacturers:

1. Trane

2. Carrier

3. Liebert

4. Or approved equal.

2.02 MANUFACTURED UNITS

A. Provide packaged, factory assembled, pre-wired unit, suitable for outdoor use consisting of casing, dual hermetic reciprocating compressors, condensing coils and fans, liquid accumulator, screens, and controls.

B. Construction & Ratings: In accordance with ARI 210/240, UL 207, and UL 303.

Testing shall be in accordance with ASHRAE 20.

C. Performance Ratings: Energy Rating (EER) in compliance with ASHRAE 90A.

2.03 CASING

A. House components in welded steel frame with galvanized steel panels with weather resistant, baked enamel finish.

B. Mount starters, disconnects, & controls in weatherproof panel; w/ opening access doors.

Provide mechanical interlock to disconnect power when door is opened.

C. Provide removable access doors or panels with quick fasteners.

D. Provide steel floor mounting stand and duct collars at coil inlet and fan outlet.

2.04 CONDENSER COILS: Aluminum fins mechanically bonded to seamless copper tubing.

Provide sub-cooling circuits. Air test under water to 425 psig.

2.05 FANS AND MOTORS

A. Vertical discharge direct driven propeller condenser fans w/ discharge fan guard

B. Weatherproof motors suitable for outdoor use, 3 phase, with permanent lubricated ball bearings and built-in current and thermal overload protection.

2.06 CONTROLS

A. Provide factory wired & mounted control panel, NEMA 250, w/ fan motor starters, fan cycling thermostats, head pressure controls, compressor interlock & control transformer.

B. Provide controls to permit operation down to 650 F ambient temperature.

C. Provide thermostat; cycle fan motor in response to outdoor ambient temperature

D. Provide head pressure switch to cycle fan motors in response to condensing pressure.

E. Provide solid state control to vary speed of one condenser fan motor in response to refrigerant condensing pressure.

F. Provide electronic low ambient control consisting of mixing damper assembly, controlled to maintain constant refrigerant condensing pressure.

PART 3 EXECUTION

3.01 INSTALLATION

A. Install in accordance with manufacturer's instructions.

B. Provide for connection to electrical service.

C. Install units on vibration isolation. Refer to Section 15245.

D. Provide connection to refrigeration piping system. Refer to Section 15535.

Comply with ASHRAE 15.

E. Provide seaonal start-up, and shut-down service, for first year of operation.

F. Shut-down system if initial start-up and testing takes place in winter and machines are to remain inoperative. Repeat start-up and testing operation at beginning of first cooling season.

----------------- END OF SECTION -------------------

ALASKA FIRE SERVICE SECTION 15785

COMPUTER ROOM AIR CONDITIONING UNITS

PART 1 GENERAL

1.01 SECTION INCLUDES

A. Air conditioning units.

B. Controls and control panels.

1.02 RELATED SECTIONS

A. Section 15515 Hydronic Specialties.

B. Section 15535 Refrigerant Piping and Specialties.

C. Section 15742 Air Cooled Refrigerant Condensers.

D. Section 15790 Air Coils.

E. Division 16 Electrical.

1.03 REFERENCES

A. ASHRAE 52 Air Cleaning Devices...General Ventilation for Removing Particulate Matter.

B. ASME SEC 8D Boilers & Pressure Vessel Codes Construction of Pressure Vessels Rules

SECTION 15785

C. NEMA 250 Enclosures for Electrical Equipment (1000 Volts Maximum).

D. NFPA 70 National Electrical Code.

E. NFPA 75 Protection of Electronic Computer/Data Processing Equipment.

F. NFPA 90A Installation of Air Conditioning and Ventilation Systems.

G. UL Underwriters Laboratories.

1.04 SUBMITTALS FOR REVIEW

A. Shop Drawings: Indicate products & assemblies. Show water, drain, refrigeration, rough in connections, and electrical characteristics and connection requirements.

B. Product Data: Provide for manufactured products and assemblies. Indicate water, drain, rough in connections, & electrical characteristics and connection requirements.

1.05 SUBMITTALS FOR INFORMATION

A. Submit under provisions of Division 1, and Section 15010.

B. Submit manufacturer installation instructions. Indicate assembly, support details, connection requirements, and include start up instructions.

1.06 SUBMITTALS FOR CLOSEOUT

A. Operation and Maintenance Data: Include manufacturer's descriptive literature, operating instructions, installation instructions, and maintenance and repair data.

1.07 QUALITY ASSURANCE

A. Manufacturer Qualifications: Company specializing in manufacturing the Products specified in this section with minimum three years experience.

B. Installer Qualifications: Company specializing in performing the work of this section with minimum three years experience.

1.08 REGULATORY REQUIREMENTS

A. Conform to NFPA 90A for the installation of computer room air conditioning units.

B. Products Requiring Electrical Connection: Listed and classified by Underwriters'

Laboratories, Inc., as suitable for the purpose specified and indicated.

1.09 WARRANTY: Include coverage of entire unit.

PART 2 PRODUCTS

2.01 MANUFACTURERS: Trane/ Vertiv / Liebert, or approved equal.

2.02 AIR CONDITIONING UNITS

A. Description: Packaged, factory assembled, pre wired and pre piped unit, consisting of cabinet, fans filters, humidifier, controls.

B. Assembly: Up flow air delivery, in draw through or blow through configuration.

2.03 CABINET AND FRAME

A. Structural Frame: welded steel suitably braced for rigidity, capable of supporting compressors and other mechanical equipment and fittings with welded tubular steel floor stand with adjustable legs and vibration isolation pads.

B. Doors and Access Panels: steel with polyurethane gaskets, hinges to allow removal of panels, and concealed fastening devices.

C. Insulation: Line cabinet interior w/ 1" thick of thermal/acoustic duct liner.

D. Finish of Exterior Surfaces: Baked on textured vinyl enamel.

2.04 EVAPORATOR FANS AND MOTORS

A. Fans: Double inlet, forward curved centrifugal fans, static & dynamically balanced, on steel shaft; self aligning lubricated ball bearings, & V belt drive or directly driven.

B. Motor: Drip proof, permanently lubricated ball bearing motor with built in current and overload protection.

C. V-Belt Drive: Cast iron or steel sheaves, dynamically balanced, keyed, variable and adjustable pitch motor sheave, minimum of two matched belts, drive rated minimum

2.0 times nameplate rating of motor.

2.05 COMPRESSORS

A. Type: Semi hermetic with suction gas cooled motors, vibration isolators, thermal overloads, oil sight glass, manual reset high pressure switch, pump down low pressure switch, suction line strainer, reversible oil pumps, 1750 rpm or Hermetic with resilient suspension system, oil strainer, crankcase sight glass, internal motor protection, low pressure switch, manual reset high pressure switch.

B. Compressors: Individually serviceable without dismantling other components.

C. Refrigeration Ckt: Two, w/ hot gas mufflers, thermal expansion valve w/ external equalizer, liquid line solenoid valve and filter drier, refrigerant sight glass w/ moisture indicator, shut off & charging valves & accumulator sized for liquid seal under light load.

2.06 EVAPORATOR COILS

A. Alternate row or Split face circuits, direct expansion cooling coils of seamless copper tubes expanded into aluminum fins in A frame configuration.

B. Mount coil assembly in stainless steel drain pan.

2.07 CONDENSERS

Glycol Cooled: with liquid line stop valve and head pressure actuated water regulating valve.

Terminate outside cabinet for easy external connections.

2.08 GLYCOL COOLING COIL

Seamless copper tubes expanded into aluminum fins with three way modulated valve,and head pressure actuated three way glycol regulating valve.

2.09 HUMIDIFIER

Infrared Type: High intensity quartz lamps mounted above stainless steel evaporator pan, serviceable w/o disconnecting water, drain, or electrical connections; pre-piped; utilizes condensate water from cooling coils with stainless steel or brass float valve mechanism;

located in bypass air stream.

2.10 REMOTE GLYCOL COOLER

Corrosion resistant aluminum cabinet with copper tube aluminum fin coil, multiple direct drive propeller fans with fan guard with internal overload protection.

2.11 DUPLEX GLYCOL PUMP PACKAGE

A. Cabinet: Weatherproof & vented; enamel galvanized steel on structural base frame

B. Duplex Pumps: Centrifugal pumps with mechanical seal.

C. Controls: Electrical control cabinet with starters, disconnect, lead/lag switch, and automatic switch over and alarm light.

D. Pipe: Interconnect pipe, from suction to discharge w/ shutoff valves, flow switches check valves in pump discharge, unions, and pressurized expansion tank with air purge vent and system charging connection.

2.12 MICROPROCESSOR CONTROL SYSTEM

A. Logic Circuitry: Microprocessor shall continuously monitor operation of process cooling system; continual digital display room temperature and room relative humidity; sound alarm on system malfunction & simultaneously display problem. When more than one malfunction occurs, display fault in sequence with room temp, remember alarm even when malfunction cleared, and continue to display fault until reset.

B. Malfunctions: Power Loss, Loss of Air Flow, Clogged Air Filter, High Room Temp., Low

Room Temp., High & Low Humidity, Smoke/Fire, Compressor No. 1 Overload, Compressor, No.

1 Low Pressure, Compressor, No. 1 High Pressure, Compressor No. 2 Overload, Compressor

No. 2 Low Pressure, Compressor No. 2 High Pressure, & Supply Fan Overload.

C. Light Emitting Diodes Display: Control Power On, System On, Compressor No. 1 operating, Compressor No. 2 operating, Humidification, De-humidification taking place, Heat or Reheat operating, Economy Cooling.

D. Push Buttons: Provide to STOP process cooling, START process cooling, SILENCE audible alarm, push to test LED indicators, and display room relative humidity.

E. Remote Signalling: Provide termination for remote signalling of status and alarms.

PART 3 EXECUTION

3.01 EXAMINATION

A. Verify flooring system is ready to receive work and opening dimensions are as indicated on shop drawings. and instructed by the manufacturer.

B. Verify that proper power supply is available and of the correct characteristics.

3.02 INSTALLATION

A. Install in accordance with manufacturer's instructions.

B. Provide adequate drainage for condensate and humidifier flushing system.

C. Provide shut off valves in hot water heating inlet and outlet piping to reheat coils; refer to

Section 15515.

D. Provide shut off valves in steam inlet and steam trap in condensate outlet piping to heating coils, refer to Section 15525.

E. Provide condenser water inlet & outlet piping shut off valves on water cooled units.

-----------END OF SECTION----------

ALASKA FIRE SERVICE BUILDING SECTION 15790

AIR COILS

PART 1) GENERAL

i) Glycol coils.

ii) Refrigerant coils.

1.02 RELATED SECTIONS

A. Section 15260 Piping Insulation.

B. Section 15515 Hydronic Specialties.

1.03 REFERENCES

A. ARI 410 Forced Circulation Air Cooling and Air Heating Coils.

B. SMACNA HVAC Duct Construction Standards, Metal and Flexible.

C. NFPA 70 National Electrical Code.

1.04 SUBMITTALS FOR REVIEW

A. Submit under provisions of Division 1, and Section 15010.

B. Product Data: Provide coil and frame configurations, dimensions, materials, rows, connections, and rough in dimensions.

C. Shop Drawings: Indicate coil and frame configurations, dimensions, materials, rows, connections, and rough in dimensions.

1.05 SUBMITTALS FOR INFORMATION

A. Submit under provisions of Division 1 and Section 15010.

B. Certificates: Certify that coil capacities, and pressure drops meet or exceed specified requirements. Coils are tested and rated in accordance with ARI 410.

1.06 SUBMITTALS AT PROJECT CLOSEOUT

Warranty: Submit manufacturer warranty in Owners name & register with manufacturer.

1.07 QUALITY ASSURANCE

Manufacturer Qualifications: Company specializing in manufacturing the Products specified in this section with minimum three years experience.

SECTION 15790

1.08 REGULATORY REQUIREMENTS

Products Requiring Electrical Connection: Listed & classified by Underwriters Laboratories Inc., as suitable for the purpose specified and indicated.

1.09 DELIVERY, STORAGE, AND HANDLING

A. Protect coil fins from crushing and bending by leaving in shipping cases until installation, and by storing indoors.

B. Protect coils from entry of dirt and debris with pipe caps or plugs.

PART 2) PRODUCTS

2.01 WATER/GLYCOL HEATING COILS

i) Manufacturer:

(1) Liebert.

(2) Or approved equal.

ii) Tubes: seamless copper or brass arranged in parallel or staggered pattern, expanded into fins, brazed joints.

iii) Fins: Aluminum or copper, continuous plate type with full fin collars or individual helical finned tube type wound under tension.

iv) Casing: Die formed channel frame of 16 gage galvanized steel with 3/8 inch mounting holes.

Provide tube supports for coils longer than 36 inches.

v) Headers: Cast iron with tubes expanded into header.

vi) Testing: Air test under water to 200 psig for working pressure of 200 psig at 2200 F.

vii) Configuration: Drainable, with threaded plugs in headers for drain and vent, or serpentine type with return bends on smaller sizes and return headers on larger sizes.

2.02 REFRIGERANT COILS

A. Manufacturer:

(1) Liebert.

(2) Or approved equal

B. Tubes: seamless copper or brass arranged in parallel or staggered pattern, expanded into fins, brazed joints.

C. Fins: Aluminum or copper, continuous plate with full fin collars or individual helical finned tube type wound under tension.

SECTION 15790

D. Casing: Die-formed channel frame; 16 ga. galvanized steel with 3/8" mounting holes.

Provide tube supports for coils longer than 36".

E. Headers: Seamless copper or brass tubes with silver brazed joints.

F. Liquid Distributors: Brass or copper venturi type distributor w/ seamless copper distributor tubes, ¼" OD for refrigerant R 22.

G. Testing: Air test under water at 300 psig for working pressure of 250 psig; clean, dehydrate, and seal with dry nitrogen charge.

viii) Configuration: Down feed with bottom suction to prevent trapping of oil.

PART 3) EXECUTION

3.01 INSTALLATION

i) Install in accordance with manufacturers written instructions.

ii) Install in ducts & casings in accordance w/ SMACNA HVAC Duct Construction Standards, Metal and Flexible.

(1) Support coil sections independent of piping on steel channel or double angle frames and secure to casings.

(2) Provide frames for maximum three coil sections.

(3) Arrange supports to avoid piercing drain pans.

(4) Provide airtight seal between coil and duct or casing.

(5) Refer to Section 15890.

iii) Protect coils to prevent damage to fins and flanges. Comb out bent fins.

iv) Install coils level. Install cleanable tube coils with 1:50 pitch.

v) Make connections to coils with unions and flanges.

vi) Hydronic Coils:

(1) Hydronic Coils: Connect water supply in a counterflow arrangement.

(2) Provide supply line shut off & lockshield balancing valve w/ memory stop on return line.

(3) Locate water supply at bottom of supply header and return water connection at top.

(4) Provide float operated automatic air vents at high points complete with stop valve.

(5) Ensure water coils are drainable; provide drain connection at low points.

vii) Refrigerant Coils: Provide sight glass in liquid line within 12" of coil. Refer to Section 15535

viii) Insulate headers located outside air flow as specified for piping. Refer to Section 15260.

------------------------- END OF SECTION ------------------------