July 22, 1994

Contract \# TW0592

**SPECIAL SPECIFICATION**

**SECTION 15820**

**[CUSTOM DEHUMIDIFICATION SYSTEM]{.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. 6

1.07Published Performance Data.. 7

1.08 Extended Warranty.. 7

1.09Equipment Support.. 8

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

2.01Acceptable Manufacturers. 9

2.02Equipment. 9

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

3.01 Inspection. 21

3.02 Installation/Application/Erection.. 21

3.03 Field Quality Control. 22

3.04 Adjusting and Cleaning. 22

3.05 Commissioning. 22

3.06 Demonstration. 23

**SPECIAL SPECIFICATION**

**SECTION 15820**

**[CUSTOM DEHUMIDIFICATION SYSTEM]{.underline}**

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

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

> A. This Section describes the physical and performance requirements
> for a factory-assembled, automatic, non-cycling, sorption type,
> desiccant, custom dehumidification system.

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

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

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

> A. The manufacturer of the custom dehumidification unit shall have at
> least 10 years of continuous, uninterrupted custom fabrication
> immediately prior to bid date. Units of similar design and application
> shall be in operation as of bid date and manufacturer shall have
> demonstrated the capability to factory test units. Field assembled
> units from pre-fabricated panels are not considered equal to a factory
> fabricated machine.

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

> A. American Refrigeration Institute (ARI).
>
> B. American Society of Heating, Refrigerating, and Air-Conditioning
> Engineers (ASHRAE) Standard 52-76.
>
> C. American Society for Testing and Materials (ASTM) E84, Standard
> Test Method for Surface Burning Characteristics of Building Materials.
>
> D. ISO 9001
>
> E. National Electrical Manufacturers Association (NEMA).
>
> F. National Fire Protection Association (NFPA) 70, National Electrical
> Code (NEC).
>
> G. Sheet Metal and Air Conditioning Contractors National Association
> (SMACNA), Publication 15d, HVAC Air Duct Leakage Test Manual.
>
> H. Underwriter\'s Laboratories (UL).
>
> I. UL 508, Industrial Control Panel.

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

> A. Make submittals according to this Section, Section 15010, and
> Section 01300.
>
> B. The manufacturer shall provide the documentation needed to verify
> that the equipment will perform as the schedule requires, and that it
> will accomplish the task with utilities provided and in the space
> allowed. Towards that end, the manufacturer shall submit the following
> documents for approval prior to production.
>
> 1\. Technical Data Sheet: The performance of the equipment at the
> specified conditions shall be described on a project-specific
> technical data sheet which includes:
>
> a\. Unit
>
> 1\) Electrical utility
>
> 2\) Full load amps
>
> 3\) Project name and HVAC system designation defined by these
> specifications
>
> 4\) End user name and installation location.
>
> b\. Process Air Side
>
> 1\) Process air flow
>
> 2\) Inlet dry bulb temperature
>
> 3\) Inlet humidity ratio
>
> 4\) Outlet dry bulb temperature
>
> 5\) Outlet humidity ratio
>
> 6\) Pressure drop through the desiccant wheel
>
> 7\) Pressure drop through the entire dehumidifier
>
> 8\) External static pressure available (if applicable)
>
> 9\) Motor horsepower
>
> 10\) Fan rotation and discharge position
>
> c\. Reactivation Air Side
>
> 1\) Reactivation air flow
>
> 2\) Inlet humidity ratio
>
> 3\) Outlet dry bulb temperature
>
> 4\) Outlet humidity ratio
>
> 5\) Pressure drop through the desiccant wheel
>
> 6\) Pressure drop through the entire dehumidifier
>
> 7\) External static pressure available
>
> 8\) Motor horsepower
>
> 9\) Fan rotation and discharge position
>
> d\. Reactivation Energy
>
> 1\) Reactivation energy type
>
> 2\) Net reactivation energy consumption rate at the specified
> conditions
>
> 3\) Method of automatic energy modulation in response to moisture load
> changes
>
> 4\) Inlet dry bulb temperature
>
> 2\. Manufacturer\'s Certifications: With the documents and drawings
> submitted for approval, the manufacturer shall provide written
> certifications to document compliance with following requirements.
>
> a\. ISO 9001 registration number and the certificate which documents
> the quality assurance programs of manufacturing and field service.
>
> b\. Description of any proprietary components, along with
> documentation of the two or more geographically-separated
> manufacturing plants required for each component.
>
> c\. Certification that the unit wiring complies with the current NEC.
>
> d\. Independent report of the flame spread test for the desiccant
> wheel, performed in accordance with ASTM E84-90 - \"Standard Test
> Method for Surface Burning Characteristics of Building Materials.\"
>
> e\. Material supplier certification that the desiccant wheel contains
> no fibers with a diameter smaller than 5 microns.
>
> 3\. Product Drawings: The manufacturer shall provide drawings of the
> proposed equipment which show:
>
> a\. A minimum of four dimensioned views of the equipment
>
> 1\) Plan view
>
> 2\) Controller side elevation
>
> 3\) Process air inlet side elevation
>
> 4\) Process air outlet side elevation
>
> b\. Centerline locations and dimensions of all connection points
>
> 1\) Process air inlet
>
> 2\) Process air outlet
>
> 3\) Reactivation air inlet
>
> 4\) Reactivation air outlet
>
> c\. Clearances and service access areas required for
>
> 1\) Desiccant wheel removal
>
> 2\) Desiccant wheel drive service
>
> 3\) Airflow adjustment
>
> d\. Casing material and the net unit weight as proposed including all
> unit-mounted and remote-mounted components required to meet these
> specifications.
>
> 4\. Operating & Maintenance Manual: The manufacturer shall provide a
> copy of the operating and maintenance manual for the proposed
> equipment. As a minimum, the manual shall contain:
>
> a\. Installation guidelines
>
> b\. Start-up checklist
>
> c\. Troubleshooting guide
>
> d\. Sequence of operations
>
> e\. Internal wiring diagram showing interconnection points for power
> and controls
>
> f\. Electrical parts list
>
> g\. Required maintenance activities, their recommended frequency
>
> h\. A list of recommended spar parts with the name, address and
> telephone number of the organization which supplies each part
>
> i\. 24-hour (hr.), 7-day service assistance telephone number

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

> A. Deliver fan units as a factory-assembled unit to the extent
> allowable by shipping limitations, with protective crating and
> covering.
>
> B. See Section 15010.
>
> C. All rigging and equipment required to get unit to installation
> location shall be provided by the Contractor.
>
> D. All units shall be cleaned after final assembly and/or testing in
> accordance with these specifications. After the unit is
> alcohol-cleaned, wrap in a protective double-layer plastic bag and
> seal all joints so that the unit can be transported, stored and
> installed without concern for contamination of the cleaned unit.
>
> E. Each cleaned and bagged unit shall then be secured to allow
> shipment and handling, without damage to the cabinet. Shipping base
> shall be suitable for handling and moving. The cleanroom contractor
> shall review and approve the method of packaging and shipment prior to
> the first shipment.
>
> F. The Contractor shall receive, unload, inspect, store, uncrate and
> install the units at the job site.
>
> G. Any units arriving at the job site that have not been adequately
> protected, per the approved methods mentioned in Paragraph 1.06D or
> have endured damage during shipping, shall be rejected by the
> cleanroom contractor/Sandia National Laboratory (SNL) and must be
> returned to the manufacturer for rework or replacement.
>
> H. The outside of the package or crate shall be adequately marked or
> tagged to indicate its contents by equipment number and weight.

**1.07 [PUBLISHED PERFORMANCE DATA]{.underline}**

> A. The manufacturer shall provide published performance data for all
> proposed equipment, so the approval authority can determine whether
> the unit has been selected within its normal operating range.
> Equipment for which there is no full range of published performance
> data shall not be acceptable. Equipment selected outside of the range
> of published performance data shall not be acceptable.

**1.08 [EXTENDED WARRANTY]{.underline}**

> A. The manufacturer shall be notified in writing of the date when all
> installation is complete and the equipment is to be started up. The
> manufacturer shall then provide a service technician to visit the
> site, review the installation and test the operation of the unit to
> verify that it is performing in accordance with the technical data
> sheet and published performance specifications. Operation of the unit
> and its testing shall be documented in writing by the technician and
> provided to SNL\'s representative.
>
> B. Within nine months of the original start up, the manufacturer shall
> provide a second visit to the site by a qualified service technician,
> who will once again verify operation and performance of the unit and
> document the testing in writing for SNL\'s representative.
>
> C. Given that the first and second visits by qualified technicians
> have been made and documented, the manufacturer shall warrant the
> equipment and the start-up service to be free from defects in
> materials and workmanship for a period of two years from date of start
> up or 27 months after shipment from the factory, whichever occurs
> first.
>
> D. If any defects appear under this extended warranty, the
> manufacturer shall be notified by SNL, and the manufacturer shall
> provide both replacement parts and labor at no cost to SNL.

**1.09 [EQUIPMENT SUPPORT]{.underline}**

> A. The manufacturer shall provide support for the equipment for a
> minimum period of 15 years following shipment of the equipment. This
> support shall, as a minimum, consist of:
>
> 1\. Spare Parts for Superseded Equipment: The manufacturer shall
> provide spare parts required for the proposed equipment for the full
> term of the 15-year support period, regardless of whether the
> equipment remains in current production.
>
> 2\. Spare Parts Availability: The manufacturer shall maintain an
> inventory sufficient to provide fast shipment of replacement parts.
> This will include:
>
> a\. Product-specific parts shall be shipped within two weeks of the
> order
>
> b\. Parts available from sources other than the manufacturer: Provide
> name, address and telephone number of an alternate supplier within 24
> hours if the part is not available for shipment by the manufacturer
> within 48 hours.
>
> 3\. Fully-Trained Service Technicians: The manufacturer shall ensure
> that qualified service technicians are available to assist SNL 24 hr.
> a day, 7 days a week for the full support period. These technicians
> shall be documented as having successfully completed training in:
>
> a\. Psychrometrics and phychrometric measurements
>
> b\. Methods of dehumidification
>
> c\. Dehumidifier applications
>
> d\. Desiccant dehumidifier performance calculations
>
> e\. Sensible heat and moisture load calculations
>
> f\. Dehumidifier start up and preventive maintenance
>
> g\. Dehumidifier troubleshooting and system diagnosis

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

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

> A. Cargocaire or approved equal.

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

> A. Dehumidifier unit casing shall be fabricated of strain-hardened
> aluminum with a minimum thickness of 0.125 inch (in.) for torsional
> rigidity and corrosion resistance. The casing shall be formed, welded
> and sealed as a single unified structure. Steel construction is not
> acceptable. Aluminum structures depending on screws for casing
> construction are not acceptable. In addition, the unit casing shall
> include:
>
> 1\. Insulation: To avoid either condensation, heat loss or loss of
> cooling capacity, the unit casing shall be insulated such that the
> heat transfer rate through casing walls is less than 0.27 British
> thermal units (Btu) per square foot (ft.2) per degree Fahrenheit (oF)
> if the wall separates air streams which differ in temperature by more
> than 25oF.
>
> 2\. Wiring: All wiring between dehumidifier components shall comply
> with the current NEC. Wiring unprotected by flexible conduit shall not
> be acceptable.
>
> 3\. Process and Reactivation Air Flow Gauges: To set and verify the
> specified air flow rates through the unit, the casing shall be
> equipped with differential pressure gauges which measure and display
> the pressure drop across the desiccant wheel. The dial of the gauges
> shall include a warning zone to indicate when the air flow is above
> the recommended operating range of the equipment.
>
> 4\. Coating: The exterior of the unit casing all surfaces of access
> panels shall be degreased and cleaned, then primed with one coat of
> industrial wash primer and finished with one coat of catalyzed
> polyurethane enamel. All pieces shall be painted individually prior to
> assembly to assure complete protection.
>
> 5\. Air Inlets: Inlets shall be equipped with manual flow control
> dampers with locking hardware. For air inlets smaller than 15 in. in
> height or width, single-blade dampers shall be acceptable. When any
> inlet dimension exceeds 15 in., the manufacturer shall provide
> opposed-blade dampers with stainless steel end seals, elastomeric edge
> seals and oil-impregnated blade shaft bushings.
>
> 6\. Maintenance Access and Inspection Panels: The unit casing shall
> include access panels for inspection and for any maintenance required
> by the operating and maintenance manual. These panels shall be
> fastened by captive hardware permanently fixed to either the panel or
> the unit casing. The panels shall be airtight to the extent of not
> leaking more than 1 percent of the rated airflow when the interior of
> the casting is under 5 in., water gage (w.g.) positive air pressure.
> Panels without gaskets shall not be acceptable. Panels held in place
> by drill-screws shall not be acceptable. Equipment which requires
> disassembly of components rather than access through removable panels
> for any maintenance required by the operating and maintenance manual
> shall not be acceptable.
>
> 7\. Filters:
>
> a\. Pre-filters shall be 2-in. thick, medium efficiency, pleated,
> disposable type. Each filter shall consist of a non-woven cotton and
> synthetic fabric media, media support gird and enclosing frame. The
> filter shall be listed by UL as Class 2.
>
> 1\) The filter media shall have an average efficiency of 25-30 percent
> on ASHRAE standard 52-76. It shall have an average arrestance of 90-92
> percent based in accordance with that standard. The effective filter
> media shall be not less than 4.6 square feet of media per 1.0 square
> foot of filter face area and shall contain no less than 15 pleats per
> linear foot. Initial resistance at 500 feet-per-minute (fpm) approach
> velocity shall not exceed .28 in. w.g.
>
> 2\) Pre-filters shall be located upstream of the pre-cooling coil and
> on the reactivation air inlet.
>
> 3\) Pre-filter media shall be Farr 30/30 or pre-approved equal.
>
> b\. Final filters shall be 12-in. thick, high performance, deep
> pleated, totally rigid and totally disposable type. Each filter shall
> consist of high density media, media support grid, contour
> stabilizers, diagonal support bracing and enclosing frame. The filter
> shall be listed by UL as Class 2.
>
> 1\) Filter media shall be of high density microfine glass fibers,
> laminated to a reinforcing backing to form a lofted filter blanket.
> The filter media shall have an average efficiency of 90-95 percent
> based on ASHRAE Standard 52-76. It shall have an average arrestance of
> 97 percent based on that standard. Initial resistance at 500 fpm
> approach velocity shall not exceed 1 in. w.g.
>
> 2\) Final filter media is supplied in supply section only. Pre-filter
> and final filter media will mount in glidepack aluminums extrusions
> suitable for side access service.
>
> 3\) Final filter media shall be Farr RF-15 or pre-approved equal.
>
> c\. Magnehelic Gauges: Gauges for the filter banks shall be factory
> mounted on the face of the unit control panel. Separate gauges shall
> be supplied for each filter bank. The pre-filter bank gauge shall have
> a 0-1 in. w.g. range. The final filter banks\' gauge shall have a 0-3
> in. w.g. range. All tubing penetration of the unit casing shall be
> factory sealed airtight.
>
> B. Electrical Control Cabinet: The electrical control cabinet shall
> meet NEMA 1 standards and shall include:
>
> 1\. Wiring to comply with the current NEC with further fuse and wiring
> sizing to meet or exceed UL 508A \"Industrial Control Panel.\"
>
> 2\. Wires shall be color-coded or numbered at both ends and all
> terminal block connection points shall be numbered. These markings
> shall correspond with the electrical diagram provided in the operating
> and maintenance manual.
>
> 3\. Components shall be UL or CSA approved where possible.
>
> 4\. Programmable Logic Controller: The unit sequence of operations
> shall be controlled by a programmable logic controller which includes
> separate indication for:
>
> a\. Power on
>
> b\. Unit running
>
> c\. Desiccant wheel rotation fault
>
> d\. Reactivation air overheat after heaters
>
> e\. Reactivation air leaving below set point
>
> f\. Motor overload
>
> 5\. Operating and Maintenance Manual: The control cabinet shall
> include a copy of the O & M manual, mounted in a separate compartment
> or pocket to allow access to critical information by maintenance
> personnel after installation.
>
> 6\. Run-Hour Meter: To allow for recording maintenance practices and
> to assist fault diagnosis, the cabinet shall have a run-hour meter
> mounted and visible from the exterior of the unit.
>
> 7\. Fan motor shall be factory wired to a NEMA 1, N-F disconnect
> located in the units factory mounted, control panel for field
> connection by others. The factory mounted control panel shall be
> exterior to the unit. Convenience controls (120 Volt \[V\]) will
> consist of one light and switch in each access section with one
> receptacle to be pre-wired and tested at the factory.
>
> 8\. All transformers, terminal strips and wiring to be furnished and
> factory installed.
>
> 9\. All conduit shall be piped to the exterior of the unit for final
> field connections where the conduit penetrates the unit casing. The
> penetration shall be factory sealed airtight.
>
> C. Reactivation Circuit: The reactivation circuit shall conform in all
> respects to the current NEC.
>
> 1\. Steam Reactivation:
>
> a\. Automatic energy modulation shall be provided by means of a
> variable-position reactivation airflow damper and motor assembly,
> controlled by a proportioning temperature controller mounted in the
> reactivation air as it leaves the dehumidifier.
>
> b\. The damper shall be equipped with edge seals and bearings rated
> for continuous duty at 400oF. It shall not leak more than 3 cfm/ft.2
> at a pressure difference of 1 in. w.g., nor more than 6 cfm/ft.2 at a
> pressure of 4 in. w.g..
>
> c\. Steam coils shall be the steam distributing, non-freeze type. They
> shall be constructed with 5/8 in. OD copper condensing tubes with a
> wall thickness of 0.049 in. and mechanically-bonded aluminum fins. The
> maximum length of a single coil shall be less than 120 times the
> outside diameter of its condensing tubes. Casing and tube support
> sheets shall be a minimum of 16-ga. galvanized steel. Tube holes in
> the casting and support sheets shall be oversized to allow for free
> thermal expansion of the tubes. Coils shall be rated for 150 pounds
> per square-inch gage (psig) and test at 300 psig steam working
> pressure.
>
> d\. Steam fittings and piping shall be provided by the installing
> contractor in accordance with a recommended diagram provided by the
> manufacturer of the dehumidifier.
>
> e\. All control valves and control interlocks for the operation and
> control of the reactivation circuit shall be by the dehumidifier
> manufacturer.
>
> D. Cooling Coils (Pre-cooling and Final Cooling)
>
> 1\. Primary surface shall be round seamless 5/8 in. OD with .020-in.
> thick wall copper tubes on 1-1/2-in. centers, staggered in the
> direction of airflow. All joints shall be brazed.
>
> 2\. Secondary surface shall consist of rippled .0075-in. aluminum
> plate fins for higher capacity and structural strength. Fins shall
> have full drawn collars to provide a continuous surface cover over the
> entire tube for maximum heat transfer. Bare copper tube shall not be
> visible between fins and the fins shall have no openings punched in
> them to accumulate lint and dirt. Tubes shall be mechanically expanded
> into the fins to provide a continuous primary to secondary compression
> bond over the entire finned length for maximum heat transfer rates.
>
> 3\. Casings shall be constructed of stainless steel with 3/8-in.
> diameter, bolt holes for mounting on 6-in. centers. Coil side plates
> shall be of reinforced flange type.
>
> 4\. Coils shall have the connections located to permit universal
> mounting of the coil for right- or left-hand airflow have equal
> pressure drop through all circuits. Coils shall be circuited for
> counterflow heat transfer to provide the maximum mean effective
> temperature difference for maximum heat transfer rates. Coil fin
> height shall not exceed 42 in..
>
> a\. Water Coils: Headers on water coils shall be seamless copper
> tubing. The headers shall have intruded tube holes to provide a large
> brazing surface for maximum strength and inherent flexibility.
>
> b\. The complete coil core shall be tested with 315 psig air pressure
> under ware water and be suitable for operation at 250 psig working
> pressures. Individual tube test and core tests before installation of
> headers is not considered satisfactory. Hydrostatic tests alone will
> not be acceptable. Water cooling coils shall be circuited for
> drainibility and for service without removing individual plugs from
> each tube. Use of internal restrictive devices to obtain turbulent
> flow shall not be acceptable since they prevent complete draining of
> the coil.
>
> c\. Coils shall have headers within the unit and terminate at the
> exterior of the unit with flanges. VIFB coil piping shall include flex
> connections and condensate piping. All piping penetrations, of the
> unit casing shall be sealed airtight at the factory.
>
> 5\. One side of this section shall have a gasketed, and bolted,
> removable access panel.
>
> 6\. Each coil shall have a condensate drain pan extending a minimum of
> 12 in. downstream of the coil face for upper coils, and 18 in. for the
> lower most coil. All condensate drain pans shall be stainless steel.
> All intermediate drain pans shall be fitted with downspouts to drain
> condensate to primary drain pan. Trapping of primary drain will be
> furnished and installed by the Contractor external to the unit casing.
>
> 7\. Cooling coils shall be ARI certified for scheduled performance and
> bear the ARI seal. Coils shall be manufactured by Heatcraft or
> approved equal.
>
> E. Steam Coil (Preheat and Final Heat)
>
> 1\. Steam coils shall be the steam distributing, non-freeze type. They
> shall be constructed with 5/8-in. OD copper condensing tubes with a
> wall thickness of 0.049 in. and mechanically-bonded aluminum fins. The
> maximum length of a single coil shall be less than 120 times the
> outside diameter of its condensing tubes. Casing and tube support
> sheets shall be a minimum of 16-ga. galvanized steel. Tube holes in
> the casting and support sheets shall be oversized to allow for free
> thermal expansion of the tubes. Coils shall be rated for 150 psig and
> test at 300 psig steam working pressure.
>
> 2\. Steam fittings and piping shall be provided by the installing
> contractor in accordance with a recommended diagram provided by the
> manufacturer of the dehumidifier.
>
> F. Desiccant Wheel: The desiccant wheel media shall be a monolithic,
> extended-surface contact medium, fabricated entirely of inert,
> inorganic binders and glass fibers formed into narrow passages in the
> direction of airflow. The wheel shall be bacteriostatic and non-toxic.
> It shall also meet the following requirements.
>
> 1\. Materials: The glass fibers which form the support matrix shall be
> made from uniform continuous strands larger than five microns in
> diameter which are nonrespiriable and are not considered a possible
> health risk by the International Agency for Research on Cancer (IARC).
>
> 2\. Flame Spread and Smoke generation: The wheel shall be tested
> according to ASTM E84-90 (Standard Test Method for Surface Burning of
> Building Materials) and shall achieve the following results:
>
> a\. Flame spread index = 0
>
> b\. Smoke developed index = 10
>
> 3\. Desiccant Impregnation: The desiccant shall be evenly impregnated
> throughout the structure for predictable, consistent performance and
> for maximum wheel life. Coatings applied on top of the contact medium
> shall not be acceptable unless the manufacturer can provide
> independent life tests demonstrating less than a 5 percent decline in
> desiccant capacity over a five year period of normal operation.
>
> 4\. Desiccant Type: The desiccant impregnated into the contact medium
> shall be:
>
> a\. Lithium Chloride: The desiccant shall be capable of absorbing 240
> percent of its own weight in water vapor when in equilibrium with air
> at 40 percent relative humidity. The absorption capacity of the
> desiccant shall not be adversely affected by particulate loading of
> the air stream as long as air can traverse the depth of the wheel. The
> desiccant as impregnated into the medium shall be proven by
> independent test reports to kill bacteria and fungi which come in
> contact with the surface of the medium.
>
> G. Desiccant Wheel Support and Drive Assembly: The wheel shall be a
> single piece for fast removal and simple handling. In the smaller
> case, the desiccant wheel shall be supported by four rollers at the
> base of the unit so the wheel can be easily removed for maintenance by
> lifting it over the rollers using the drive belt. Center-axle support
> or any arrangement which requires disassembly of the support structure
> for wheel removal shall not be acceptable. In addition, the wheel
> drive assembly shall provide:
>
> 1\. Rotation Speed: To avoid excessive heat carryover from
> reactivation to the process air, the wheel rotation speed shall not
> exceed 10 revolutions-per-hr. (rph) while achieving the required
> moisture removal rate at the specified conditions.
>
> 2\. Drive Belt: The drive belt shall be the flat, toothed type, with
> aramid fiber reinforcement.
>
> 3\. Drive Motor: The drive motor shall be fractional horsepower and
> rated for continuous duty for a period of 20,000 hr. under the load
> conditions imposed by the drive assembly. See below for additional
> information.
>
> 4\. Rotation Detection: The drive assembly shall be equipped with a
> rotation detection circuit which shuts down the dehumidifier and
> signals the operator through an indicating light on the control
> cabinet if the wheel is not rotating.
>
> H. Air Seals and Internal Air Leakage: The process and reactivation
> air streams shall be separated by air seals and internal partitions so
> that the humid reactivation air does not mix with the dry process air.
> The proposed equipment shall meet the following minimum requirements:
>
> 1\. Wheel Face Seals: The dehumidifier shall have full-face seals on
> both the process air entering and the process air leaving sides of the
> wheel. These shall seal the entire perimeter of both air streams as
> they enter and leave the wheel. Partial seals shall not be acceptable.
> The seals shall be the silicone rubber bulb-type, with a protective
> strip of low-friction, abrasive-resistant tape to extend seal life and
> reduce the force needed to turn the desiccant wheel. Neither
> wiper-type seals nor brush-type nor any non-contact-type seal shall be
> acceptable. The seals shall be documented to have a minimum working
> life of 25,000 hr. of normal operation.
>
> 2\. Total Casing Air Leakage: The unit shall not allow leakage to
> exceed the greater of the following values:
>
> a\. One percent of the process air flow
>
> b\. SMACNA Leakage Class 6.
>
> c\. Determine leakage using the testing methods described by SMACNA
> Publication 15d, \"HVAC Air Duct Leakage Test Manual.\"
>
> I. Process and Reactivation Air Fans: Process and reactivation air
> fans shall be the single-inlet, single-width, centrifugal-type.
>
> 1\. Fan Wheel Type: Shall be backward-inclined, belt-driven
> centrifugal type.
>
> 2\. Balancing: Fans shall be balanced after assembly and after coating
> at the speed the unit is scheduled to operate. Fans shall be balanced
> such that the maximum displacement in any plane is less than 1.0 mils,
> peak to peak.
>
> 3\. Belt-Driven Fans: The drive shall be selected for 150 percent of
> rated capacity. All belt-driven fans shall be equipped with:
>
> a\. Removable belt guards with openings to allow tachometer readings
> at both fan and motor shafts. Guards shall also be constructed to
> allow visual inspection of the belts without removing the guard.
>
> b\. Vibration isolators, with a minimum efficiency of 95 percent and
> seismic snubbers. See section 15200.
>
> 4\. Fan Motors: Fan motors shall be the totally enclosed, fan-cooled,
> high-efficiency type. See below for additional information.
>
> J. Motors
>
> 1\. General
>
> a\. Apply requirements below to motors covered by this Section except
> as otherwise indicated.
>
> b\. Motors 1 Horsepower (hp) and Larger: Polyphase.
>
> c\. Motors Smaller than 1 hp: Single-phase.
>
> d\. Frequency Rating: 60 Hertz.
>
> e\. Voltage Rating: Determined by voltage of circuit to which motor is
> connected for the following motor voltage ratings (utilization
> voltages):
>
> 1\) Motors smaller than 1 hp: 120 V circuit, 115 V - motor rating.
>
> 2\) Motors 1 hp and larger: 480 V circuit, 460 V - motor rating.
>
> f\. Service factor indicated for motors are minimum values and apply
> at frequency and utilization voltage at which motor is connected.
> Provide motors which will not operate in service factor range when
> supply voltage is within 10 percent of motor voltage rating.
>
> g\. Provide permanent-split capacitor classification motors for
> shaft-mounted fans and capacitor start classification for belted fans.
>
> h\. Capacity: Minimum size as indicated. If not indicated, sufficient
> to start and operate connected loads at designated speeds in indicated
> environment, and with indicated operating sequence, without exceeding
> nameplate ratings. Provide motors rated for continuous duty at 100
> percent of rated capacity.
>
> i\. Temperature Rise: 50 degree (deg.) Celsius (C) maximum temperature
> rise at 40 deg. C ambient for continuous duty at full load (Class A
> Insulation).
>
> j\. Motor Speed: Single.
>
> k\. Motor Construction: NEMA Standard MG 1.
>
> 1\) Bases: Adjustable.
>
> 2\) Bearings: The following features are required:
>
> a\) Ball or roller bearings with inner and outer shaft seals.
>
> b\) Grease Lubricated.
>
> c\) Designed to resist thrust loading where belt drives or other
> drives produce lateral or axial thrust in motor.
>
> 3\) Enclosure Type: The following features are required unless noted
> otherwise.
>
> a\) Open drip-proof motors where satisfactorily housed or remotely
> located during operation.
>
> b\) Guarded drip-proof motors where exposed to contact by employees or
> building occupants.
>
> 4\) Noise rating: Quiet.
>
> 5\) Nameplate: Indicate the full identification of manufacturer,
> ratings, characteristics, construction, and special features.
>
> 2\. Polyphase Motors
>
> a\. Squirrel-cage, induction-type, general-purpose conforming to the
> following requirements except at otherwise indicated.
>
> b\. Nema Design Letter Designation: \"B,\" unless specifically
> designed \"C\" for high starting torque.
>
> c\. Service Factor: 1.15.
>
> d\. Energy Efficient Motors: Nominal efficiency equal to or greater
> than that stated in NEMA MG 1, table 12-6C for that type and rating of
> motor.
>
> e\. Internal Thermal Overload Protection For Motors: Protection
> automatically opens control circuit arranged for external connection.
> Protection operates when winding temperature exceeds safe value
> calibrated to the temperature rating of the motor insulation.
>
> f\. Bearings: Double-shielded, pre-lubricated ball bearings suitable
> for radial and thrust loading of the application,unless noted
> otherwise.
>
> 3\. Single-phase Motors
>
> a\. Conform to the following requirements except as otherwise
> indicated.
>
> b\. Energy Efficient Motors: One of the following types as selected to
> suit the starting torque and other requirements of the specific motor
> application.
>
> 1\) Permanent Split Capacitor.
>
> 2\) Split-Phase Start, Capacitor-Run.
>
> 3\) Capacitor-Start, Capacitor-Run.
>
> c\. Service Factor: 1.35.
>
> d\. Shaded-Pole Motors: Use only for motors smaller than 1/20 hp.
>
> e\. Internal Thermal Overload Protection for Motors: Protection
> automatically opens the power supply circuit to the motor, or a
> control circuit arranged for external connection. Protection operates
> when winding temperature exceeds a safe value calibrated to the
> temperature rating of the motor temperature returns to normal range
> except as otherwise indicated.
>
> f\. Bearings, belt connected motor and other motors with high radial
> forces on motor shaft shall be ball bearing type. Sealed,
> pre-lubricated sleeve bearings may be used for other single phase
> motors.
>
> K. Moisture Removal Capacity Control: The dehumidifier shall operate
> automatically, in response to the control system supplied by the
> manufacturer as follows:
>
> 1\. Process Air Face and Bypass Modulation: The volume of process air
> passing through the dehumidifier shall be modulated by means of,
> electric motor-driven dampers which cover the process air inlet and
> the bypass air inlet to the dehumidifier casing. The bypass air duct
> shall be included inside the dehumidifier casing such that no
> additional external ductwork need be added to the unit to achieve
> control. The bypass duct shall be equipped with an orifice plate to
> balance the pressure drop of the bypass to equal that of the desiccant
> wheel at full flow.
>
> a\. Dampers: Dampers shall be opposed-blade type, with galvanized
> steel frames, stainless steel end-seals, elastomeric blade edge seals
> and oil-impregnated blade shaft bushings.
>
> b\. Damper Frames and Casing: The damper frames shall be fastened and
> sealed to eliminate air bypass around the damper assembly. The
> operator(s) and connecting linkages shall be mounted in a separate
> compartments sealed from the supply air stream and from the ambient
> environment. The compartment shall be equipped with an access panel
> for ease of adjustment and servicing without the need to disturb the
> supply air flow.
>
> c\. Damper Operators: Damper operators shall be the proportional type
> with spring return on power loss. They shall operate in response to a
> continuous signal input signal.
>
> d\. Responsibility for the control system shall be divided as follows:
>
> 1\) Dehumidifier Manufacturer: Provide the dehumidifier complete with
> dampers and motors mounted, wired and tested in the factory prior to
> shipment. The manufacturer shall provide the sensor/controller
> suitable for operation and control at the specified location and
> humidity control range.
>
> 2\) Installing Contractor: Install the humidity sensor in the location
> specified, and wire the sensor and controller to the dehumidifier.
> Reset the fixed-position bypass flow control damper such that pressure
> drop through the bypass equals the pressure drop through the desiccant
> wheel at the specified process air flow rate.
>
> 3\) Controls shown within the unit and designated on Control Drawing
> 104658 C3 shall be provided by the unit manufacturer.

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

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

> A. Inspect areas and conditions, with Installer present, for
> compliance with requirements for installation tolerances, housekeeping
> pads, and other conditions affecting performance of the dehumidifier.
>
> B. Inspect rough-in for utilities to verify actual locations of
> connections prior to installation.
>
> C. Do not proceed until unsatisfactory conditions have been corrected.

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

> A. General
>
> 1\. Install dehumidifier level and plumb, in accordance with
> manufacturer\'s written instructions.
>
> a\. Support floor-mounted units on concrete equipment bases. Secure
> units to anchor bolts installed in concrete equipment base.
>
> 2\. Arrange installation of units to provide access space around
> dehumidifier for service and maintenance.
>
> B Connections
>
> 1\. Piping installation requirements are specified in other Division
> 15 Sections. The Drawings indicate the general arrangement of piping,
> valves, fittings, and specialties. The following are specific
> connection requirements:
>
> a\. Arrange piping installations adjacent to units to allow unit
> servicing and maintenance.
>
> b\. Connection piping to dehumidifier with flexible connectors.
>
> 2\. Duct installations and connections are specified in other Division
> 15 Sections. Make final duct connections with flexible connections.
>
> 3\. Electrical Connections: The following requirements apply:
>
> a\. Electrical power wiring is specified in Division 16.
>
> b\. Temperature control wiring and interlock wiring is specified in
> Division 13 Section \"HVAC Controls and Energy Management System.\"
>
> c\. Grounding: Connect unit components to ground in accordance with
> the NEC.

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

> A. Provide a factory-authorized service representative to perform the
> following:
>
> 1\. Inspect the field assembly of components and installation of
> dehumidification systems including piping, ductwork, and electrical
> connections.
>
> 2\. Prepare a written report on findings and recommended corrective
> actions.

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

> A. Adjust damper linkages for proper damper operation.
>
> B. Clean unit cabinet interiors to remove foreign material and
> construction dirt and dust. Vacuum clean fan wheel, fan cabinet,
> reactivator section, and coils entering air face.

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

> A. The service technician shall start up and adjust the unit in
> accordance with instructions contained in the operating and
> maintenance manual provided by the manufacturer. The start up
> technician must pay particular attention to the following items:
>
> 1\. Air Flow: The air flow volume of the process and reactivation air
> streams shall be set so that the reading on the manometers on the unit
> matches the values outlined on the technical data sheet provided by
> the manufacturer.
>
> 2\. Utilities: The power and reactivation energy connections shall be
> made carefully and checked against the unit specifications outlined on
> the technical data sheet provided by the manufacturer.
>
> 3\. Documentation: The start-up technician shall provide written
> documentation of compliance with procedures outlined by the
> manufacturer in the operating and maintenance manual. As a minimum,
> the technician shall measure and record the values for the electrical
> power, the air flow manometers and the run-hour meter. The technicians
> full name and telephone number and the start-up date shall be printed
> legibly on the start up documentation and on the copy of the technical
> data sheet in the operating and maintenance manual which is mounted
> inside the unit control cabinet.
>
> B. Provide labor, material, equipment, etc., required to facilitate
> the commissioning process. Perform form tests and verification
> procedures required by the commissioning process when requested by the
> Commissioning Authority and directed by the General Contractor. See
> Section 15995.

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

> A. Provide a factory-authorized service representative to start-up
> equipment, to demonstrate operations, and to train personnel.
>
> B. See Section 15995.
>
> END OF SECTION
>
> EXCEPT FOR ATTACHMENT
>
> SK-AHU-3