July 22, 1994

Contract \# TW0592

**SPECIAL SPECIFICATION**

**SECTION 15832**

**[COMPUTER ROOM AIR-CONDITIONING UNIT]{.underline}**

[Page]{.underline}

**[PART 1 - GENERAL]{.underline}**

1.01 Description.. 2

1.02Related Work.. 2

1.03Quality Assurance.. 2

1.04References.. 2

1.05Submittals. 3

1.06 Delivery, Storage, and Handling.. 3

1.07Sequencing.. 4

**[PART 2 - PRODUCTS]{.underline}**

2.01Acceptable Manufacturers\... 5

2.02 Equipment\... 5

**[PART 3 - EXECUTION]{.underline}**

3.01 Inspection. 8

3.02 Preparation\... 8

3.03 Installation/Application/Erection.. 8

3.04 Field Quality Control\.... 8

3.05 Adjusting and Cleaning.. 9

3.06 Commissioning.. 9

3.07 Demonstration.. 9

**SPECIAL SPECIFICATION**

**SECTION 15832**

**[COMPUTER ROOM AIR-CONDITIONING UNIT]{.underline}**

**[PART 1 - GENERAL]{.underline}**

**1.01 [DESCRIPTION]{.underline}**

> A. This Section and the Drawings describe the requirements for the
> computer room air conditioning units.
>
> B. Provide a unit which maintains temperature and humidity conditions
> in the room or rooms it is located. Provide a self-contained,
> factory-assembled, computer-room, air conditioning unit with up-flow
> air delivery and an integral condensate pump capable of pumping at 20
> ft. of head.

**1.02 [RELATED WORK]{.underline}**

> A. Section 01300
>
> B. Section 15010
>
> C. Section 15200
>
> D. Section 15995

**1.03 [QUALITY ASSURANCE]{.underline}**

> A. Manufacturer\'s Qualifications: Firm experienced in manufacturing
> computer room air-conditioning unit similar to those indicated for
> this Project and that have a record of successful in-service
> performance.

**1.04 [REFERENCES]{.underline}**

> A. American Society of Heating, Refrigerating, and Air-Conditioning
> Engineers (ASHRAE) 52-76.
>
> B. Anti-Friction Bearing Manufacturers Association (AFBMA) Standard 9
> for ball-bearings.
>
> C. National Electrical Manufacturers Association (NEMA) MG 1.

**1.05 [SUBMITTALS]{.underline}**

> A. Make submittals according to this Section, Section 15101, and
> Section 01300.
>
> B. Product data for each computer room air-conditioning unit including
> the following:
>
> 1\. Unit refrigerant.
>
> 2\. Unit design requirements.
>
> 3\. Unit features.
>
> 4\. Weights (shipping, installed, and operating).
>
> 5\. Furnished accessories.
>
> 6\. Installation and start-up instructions.
>
> C. Shop drawings detailing fabrication and installation of computer
> room air-conditioning unit including plans, elevations, sections,
> component details, attachments, and other construction elements.
> Include the following:
>
> 1\. Dimensions.
>
> 2\. Weight loadings and distribution.
>
> 3\. Clearances for maintenance and operation.
>
> 4\. Size and location of field connections.
>
> D. Wiring diagrams detailing power and control wiring. Differentiate
> clearly between manufacturer-installed wiring and field-installed
> wiring.
>
> E. Maintenance data for each computer room air-conditioning unit to be
> included in the operating and maintenance manual specified in Section
> 01300.
>
> F. Certification of performance from the factory.
>
> G. Certification letter from manufacturer stating that the computer
> room air-conditioning unit has been through start-up procedures and
> that it is functioning properly.

**1.06 [DELIVERY, STORAGE, AND HANDLING]{.underline}**

> A. See Section 15010.

**1.07 [SEQUENCING]{.underline}**

> A. Coordinate unit with the raised floor installation.

**[PART 2 - PRODUCTS]{.underline}**

**2.01 [ACCEPTABLE MANUFACTURERS]{.underline}**

> A. Liebert
>
> B. Compu-Aire

**2.02 [EQUIPMENT]{.underline}**

> A. Cabinet and Frame Construction: Provide a heli-arc welded tubular
> steel frame. Insulate the exterior panels with a minimum 1 in., 1.5
> lbs. density fiber insulation. Use captive 1/4 turn fasteners on the
> main front panel. Paint the unit off-white with an accent color of
> off-white.
>
> B. Filter Chamber: Provide within the cabinet a filter chamber which
> is serviceable from the front. Provide 30 percent efficient filters
> per ASHRAE 52-76.
>
> C. Fan Section
>
> 1\. Provide a centrifugal, double-width, double-inlet fan which is
> statically and dynamically balanced as a completed assembly to a
> maximum vibration level of 2 millimeters (mm) in any plane.
>
> 2\. Provide a steel shaft with self-aligning ball bearings. Use
> lubricatable ball-bearings with a minimum life span of 100,000 hours
> (hr.) per AFBMA Standard 9.
>
> 3\. Provide poly-phase, 1750 revolutions-per-minute, fan motor mounted
> on an adjustable slide base. Use motors rated for 480-V, 3-ph., 60-Hz
> when the motor is over 3/4 horsepower (hp) and larger. Provide a motor
> with NEMA Design Letter Designation \"B\", rated for continuous duty.
> Use an energy efficient motor with a nominal efficiency equal to or
> greater than that stated in NEMA MG 1, table 12-6C for that type and
> rating of motor. Provide double-shielded, pre-lubricated ball-bearings
> suitable for the radial and thrust loading of the application.
>
> 4\. Provide a two-belt, variable-speed, drive package, sized for 200
> percent of the fan motor hp.
>
> 5\. Locate the fans to draw air over the A-frame coil to ensure even
> air distribution and maximum coil performance.
>
> D. Infrared Humidifier: Provide an infrared type humidifier consisting
> of high intensity quartz lamps mounted above and out of the water
> supply. Use an stainless steel evaporator pan arranged to be
> serviceable without disconnecting high voltage electrical connections.
> Pre-pipe the humidifier section for one final tie-in connection. Use
> bypass air to prevent over-humidification of the computer room. Equip
> the humidifier with an automatic water supply system. Provide the
> system with an adjustable water-overfeed to prevent mineral
> precipitation.
>
> E. Hot Water Reheat: Provide hot water reheat coil with copper tubes
> and aluminum fins. Pre-pipe the 2-way modulating control valve and
> cleanable Y-strainer.
>
> F. Standard Control Processor: Provide a microprocessor based control
> system.
>
> 1\. Adjustable Functions: Provide two .43-inch (in.) high, seven
> segment, light emitting diode (LED), numerical displays to allow
> observation of room temperature and humidity and each adjustable
> function:
>
> a\. Temperature Set-point 65-85 deg. F.
>
> b\. Temperature Sensitivity 1 to 5 deg. F.
>
> c\. Humidity Set-point 40-60 percent relative humidity (rh).
>
> d\. Humidity Sensitivity 1 percent to 10 percent rh.
>
> e\. Humidifier Flush Rate.
>
> 2\. Normal Operating Modes: Indicate the modes below by colored LEDs
> on the unit-mounted display panel.
>
> a\. Heating
>
> b\. Cooling
>
> c\. Humidification
>
> d\. Dehumidification
>
> 3\. Alarm Conditions: Activate audible and visual alarm in the event
> any of the following factory preset alarm conditions are initiated:
>
> a\. High Temperature
>
> b\. Low Temperature
>
> c\. High Humidity
>
> d\. Low Humidity
>
> e\. Restricted Air Filters
>
> f\. Loss of Air.
>
> 4\. Activate a common alarm light when any of the above conditions
> exist, high head pressure develops, or water accumulates under the
> floor.
>
> 5\. Provide a compressor sequence feature to change the lead/lag
> sequence of the compressors.
>
> G. Chilled-Water Systems
>
> 1\. Chilled Water Control Valve: Provide a 3-way modulating,
> proportional, valve which is positioned by the microprocessor in
> response to room conditions. Control cooling capacity by bypassing
> chilled water around the coil.
>
> 2\. A-Frame Chilled Water Coil: Construct the coil of copper tubes and
> aluminum fins. Limit the maximum face velocity to 500 ft. per minute.
> Provide a stainless steel condensate drain pan. Control the coil with
> a 3-way modulating control valve.
>
> 3\. Flow Switch: Provide a flow switch to activate the alarm system
> should the chilled water supply be interrupted. Factory mount and wire
> the switch.
>
> H. Accessories
>
> 1\. Disconnect Switch (Non-Locking Type): Provide a non-automatic
> molded case circuit breaker mounted in the high voltage section of the
> electrical panel. Make the switch accessible with the door closed.
>
> 2\. Firestat: Provide a firestat to immediately shut down the computer
> room air-conditioning system when activated. Mount the firestat in the
> electrical panel with the sensing element in the return air.
>
> 3\. Liqui-Tect Sensors (Max. of two per unit): Provide 2 solid state
> water sensors under the raised floor.
>
> 4\. Smoke Detector: Provide a smoke detector to immediately shut down
> the computer room air-conditioning unit and activate the alarm system
> when activated. Mount the smoke detector in the electrical panel with
> the sensing element in the return air compartment.
>
> I. Design Requirements
>
> 1\. See Drawings for information.

**[PART 3 - EXECUTION]{.underline}**

**3.01 [INSPECTION]{.underline}**

> A. Inspect areas to receive the computer room air-conditioning units
> for compliance with requirements for installation tolerances and other
> conditions affecting performance. Do not proceed with installation
> until unsatisfactory conditions have been corrected.

**3.02 [PREPARATION]{.underline}**

> A. Coordinate final locations of the computer room air-conditioning
> units with the raised floor layout.

**3.03 [INSTALLATION/APPLICATION/ERECTION]{.underline}**

> A. Install computer room air-conditioning units in accordance with
> manufacturer\'s installation instructions. Install units plumb and
> level, firmly anchored in locations indicated, and maintain
> manufacturer\'s recommended clearances.
>
> B. Install and connect electrical devices furnished by manufacturer
> but not specified to be factory mounted. Furnish copy of
> manufacturer\'s electrical connection diagram submittal to electrical
> contractor.
>
> C. Install and connect devices furnished by manufacturer but not
> specified to be factory mounted. Furnish copy of manufacturer\'s
> piping connection diagram submittal to piping contractor.
>
> D. Install vibration isolation and snubbers according to
> manufacturer\'s recommendations and Section 15200.
>
> E. Install piping connections maintaining clearances for service and
> maintenance.
>
> F. Install flexible pipe and electrical connections for computer room
> air-conditioning units mounted on vibration isolation.
>
> G. Install shutoff valves at the computer room air-conditioning
> units\' inlet and outlet connections.

**3.04 [FIELD QUALITY CONTROL]{.underline}**

> A. Start up mainframe coolant units in accordance with manufacturer\'s
> start up instructions. Test controls and demonstrate compliance with
> requirements.

**3.05 [ADJUSTING AND CLEANING]{.underline}**

> A. Clean computer room air-conditioning units using materials and
> methods recommended by the manufacturer.
>
> B. Clean finishes to remove dust and dirt.
>
> C. Touch up scratches on unfinished surfaces to restore corrosion
> resistance.
>
> D. Touch up scratches on finished surfaces to restore finish.

**3.06 [COMMISSIONING]{.underline}**

> A. Provide labor, material, equipment, etc., required to facilitate
> the commissioning process.
>
> B. Perform form tests and verification procedures required by the
> commissioning process when requested by the Commissioning Authority
> and directed by the General Contractor.
>
> C. See Section 15995.

**3.07 [DEMONSTRATION]{.underline}**

> A. Provide factory-authorized service representative to start-up
> equipment, to demonstrate operation and to train personnel.
>
> B. See Section 15995.
>
> END OF SECTION