S-10700-00004077_Add001.pdf

ITB # S-10700-00004077, Addendum 001 Page 1 of 1

ADDENDUM No: 001

STATE OF OREGON

DEPARTMENT OF ADMINISTRATIVE SERVICES

January 6, 2023

ITB NO: S-10700-00004077

PROJECT: Public Health Laboratory – Biosafety Level 2 & Level 3 Lab Renovations

BID CLOSING DATE: JANUARY 10, 2023/ NOT LATER THAN 2:00 PM

This Solicitation Addendum is issued to the above referenced bid and forms a part of the contract documents and modifies the original scope of work, specifications and drawings, and requirements. Except as changed by this Addendum, all terms, conditions, scope of work, plans, specification, requirements and deadlines in the original ITB and previous addenda remain unchanged.

This Solicitation Addendum must be acknowledged by inserting its number on the appropriate blank lines in Section H – Addenda Acknowledgement of the Invitation to Bid. Failure to do so may result in rejection of Bid.

Requests for clarification, requests for change, and protests of Solicitation Addendum provisions addressed in this Solicitation Addendum must be received by DAS by 1 PM (Pacific Time) on January 9, 2023, or they will not be considered. DAS will not consider requests or protests of matters not added to or modified by this Solicitation Addendum.

Modified Attachment A, Specifications Section 01 3573, Delegated Design Procedure Paragraph 1.1D: Revise list of delegated design components, as bolded per attachment.

2 Modified Attachment A, Specifications Section 11 5355, Vertical Airflow Stations Revise/Delete: Subparagraph 2.3B.1: Delete the casters from Laminar Flow Hood No.1(NU-340-630), as bolded per attachment.

3 Modified Attachment A, Specifications Section 23 8413, Humidifiers Adds Subparagraph 2.1A.4a: Add other acceptable manufacturer and product as approved by substitution process, as bolded per attachment.

4 Modified Attachment B, Plans, Drawing CS As indicated in Drawing CS dated 01-06-2023, per attachment. Deferred submittal list (delegated design) provided on cover sheet.

5 Modified Attachment B, Plans, Drawing S2.3 As indicated in Drawing S2.3 dated 01-06-2023, per attachment. Castors deleted from NU 340-630 Laminar Flow Hood unit to provide anchorage only on detail 11/S2.3.

End of Addendum 001

LRS Architects, Inc.

Oregon Health Authority Public Health Division, Public Health Laboratory -

[ADDM 01] Delegated Design Procedures 01 3573

Biosafety Level 2 & Biosafety Level 3 Lab Renovations

PART 1 GENERAL

1.1. SUMMARY

A. Certain components of the Work under this project are Delegated Design. It is the Contractor's responsibility to coordinate and assume or assign to subcontractors the complete responsibility for the design, calculations, submittals, fabrication, transportation, and installation of the Delegated Design portions or components as required in this Section. The Applicant is responsible for submitting to the City of Hillsboro, Development and Permitting Department, all Delegated Design documents required for the separate approval for each Delegated Design item. There are no exceptions. Delegated Design components of this Work are defined as complete, operational systems, provided for their intended use.

B. The Architect's or Engineer of Record's review of Delegated Design submittals shall be for design intent and shall not lessen nor shift the responsibility from the Applicant or the assigned subcontractor to the Owner nor to the design professional. The Owner shall not be responsible for paying for any delays, additional products, additional hours of work or overtime, restocking or rework required due to failure by the Applicant or the subcontractor to coordinate their Work with the Work of other trades on the project or to provide the Delegated Design portion or component in a timely manner to meet the schedule of the project.

C. City of Hillsboro Requirements: Follow the City of Hillsboro's requirements current at the time of submission. The Applicant is responsible for coordinating and submitting all material required by the City so that the City's review will not adversely affect the construction schedule.

At or near the time of application, the Applicant shall meet with the City to identify Delegated Design components and how they are to be submitted and processed.

D. Delegated Design components known at this time:

1. Uni-Strut System

2. Firestopping

3. Fire Suppression

4. Division 22: Plumbing

5. Division 23: Heating, Ventilating, and Air Conditioning (HVAC)

6. Division 26: Electrical [ADDM 01]

E. Refer to systems descriptions in technical Sections of these Specifications for additional information on Delegated Design work.

1.2. DEFINITIONS

A. Applicant: Person applying for building permit for Delegated Design systems and person coordinating Delegated Design systems with basic building. Includes coordination of required submittals.

Public Health Division, Public Health Laboratory -

[ADDM 01] Delegated Design Procedures 01 3573

B. Architect or Engineer of Record: Architect or Engineer registered in state that Project is located, engaged by the Owner to provide plans and computations, and establish design criteria for Delegated Design components and specifications required by the Building Official for principle Project systems.

C. Contractor: Entity engaged by the Owner to construct the Project. Includes employees, subcontractors, suppliers, and their employees.

D. Deferred Submittal: Those portions of the design of the building/structure that are not submitted at the time of permit application that are to be submitted to the building official within a specified period.

E. Delegated Design Engineer: Professional Engineer registered in state that Project is located, engaged by the Contractor to provide plans, computations, and specifications required by the Building Official for a designated delegated design specialty system, in accordance with criteria set forth in Contract Drawings and Specifications.

F. Seal: Certification that plans, computations, and specifications were designed and prepared under the direct supervision of the Engineer whose name appears thereon.

G. Review Stamp: Certification, by means of a stamp or other similar notation, that the Architect or Engineer has reviewed plans, computations, and specifications bearing the seal of the Delegated Design Engineer, verifying conformance with information given and design concept set forth in Contract Drawings and Specifications.

H. Approval Stamp: Certification that the Building Official has reviewed a submittal and finds it acceptable with respect to applicable code compliance.

1.3. SUBMITTALS

A. Comply with pertinent provisions of Section 01 3000, Administrative Requirements.

1.4. SPECIFIC REQUIREMENTS

A. Performance and Design Criteria: Where professional design services or certifications by a design professional are specifically required of Contractor by the Contract Documents, provide products and systems complying with specific performance and design criteria indicated.

1. If criteria indicated are not sufficient to perform services or certification required, submit a written request for additional information to Architect.

B. Some Delegated Design components are shown in the Contract Documents for design intent.

The purpose is to have the Contractor responsible for providing, coordinating, and installing the Delegated Design component.

C. Delegated Design components attached to the structural frame or supplemental to the structural frame shall be designed for the anticipated loads as outlined in the Contract Documents. These Delegated Design components shall be coordinated with the appropriate subcontractors.

Public Health Division, Public Health Laboratory -

[ADDM 01] Delegated Design Procedures 01 3573

D. Load reactions at the interface between the Delegated Design components and the structural frame shall be clearly defined to allow for a review by the Architect or Engineer of Record.

End of Section

Public Health Division, Public Health Laboratory -

[ADDM 01] Vertical Airflow Stations 11 5355

PART 1 - GENERAL

1.1. SECTION INCLUDES

A. Laminar Airflow Workstations

B. Connection to utilities.

1.2. RELATED REQUIREMENTS

A. Section 01 4000 – Quality Requirements: Lab equipment commissioning requirements.

B. Section 05 4300 – Slotted Channel Framing (Strut System): Strut bracing to align.

C. Section 11 5353 – Biological Safety Cabinet (BSC).

D. Section 23 3300 - Air Duct Accessories: Ductwork connections.

E. Section 26 0500 - Wiring Connections: Electrical connections.

1.3. ADMINISTRATIVE REQUIREMENTS

A. Preinstallation Meeting: Conduct preinstallation meeting one week prior to the start of the work of this section; require attendance by all affected installers.

B. Sequencing: Ensure that utility connections are achieved in an orderly and expeditious manner.

1.4. SUBMITTALS

A. See Section 01 3000 – Administrative Requirements: Submittal Procedures.

B. Shop Drawings: Show complete construction details, fittings, electrical connection, filters and other information necessary to fully describe each unit and its installation. Include plans and elevations. Indicate required installation, operational, and maintenance clearances to wall and ceilings.

C. Product Data: Show test results and performance charts.

D. Manufacturer's Certificate: Certify that products meet or exceed specified requirements.

E. Installer's Qualification Statement.

F. Operation Data: Include description of equipment operation and required adjusting and testing.

G. Maintenance Data: Identify maintenance requirements, servicing cycles, recertification requirements, and local spare part sources.

[ADDM 01] Vertical Airflow Stations 11 5355

H. Field Reports: Start-up report(s) prepared by independent qualified certifier, accredited by NSF to test and balance vertical airflow stations.

1.5. QUALITY ASSURANCE

A. Manufacturer Qualifications: Company specializing in manufacturing the types of products specified in this section, with minimum three years of documented experience.

B. Installer Qualifications: Company specializing in performing work of the type specified and with minimum three years of documented experience and approved by manufacturer.

C. Testing Agency Qualifications: Independent firm specializing in performing testing and inspections of the type specified in this section.

D. Safety Glass: Comply with testing requirements of 16 CFR 1201 for Category II materials.

1.6. DELIVERY, STORAGE, AND HANDLING

A. Package each piece of equipment to ensure protection from damage during shipment and delivery.

1. Legibly indicate on the exterior of each container or crate, the shipping address and a brief description of its contents.

2. Outside of the container, fasten a waterproof envelope containing a packing list and complete instructions for uncrating and setting the equipment in place.

B. Protect finished surfaces during handling and installation with protective covering of polyethylene film or another suitable material.

PART 2 - PRODUCTS

2.1. MANUFACTURERS

A. Vertical Laminar Airflow Workstations - Basis of Design:

1. Laminar Airflow Hood No.1:

a. NuAire Inc; Type AireGard, NU-340-630, Horizontal Laminar Airflow Workstation.

b. Location: Room BP10

2. Laminar Airflow Hood No.2:

a. NuAire Inc; Type AireGard, NU-240-336, Horizontal Laminar Airflow Workstation.

b. Location: Room BP30.

3. Laminar Airflow Hood No.3:

a. Air Science; Purair PCR Vertical Laminar Flow Workstation; PCR-48.

b. Location: Room BP03.

4. Substitutions: As submitted according to Section 01 6000, " Product Requirements".

[ADDM 01] Vertical Airflow Stations 11 5355

2.2. PERFORMANCE/DESIGN CRITERIA

A. Design meeting requirements of the particular class and type of cabinet.

1. Air Cleanliness: ISO- Class -5; vertical airflow direction.

2. Performance Standard: IEST-RP-CC002.4, ISO-14644-1

3. Airflow Velocity: 90 fpm (0.46 m/s)

2.3. LAMINAR AIRFLOW WORKSTATIONS

A. General: HEPA-filtered, vertical and horizontal ventilated laminar airflow cabinet designed to offer product protection for sterile, but non-hazardous work, while limiting cross-contamination between agents inside the cabinet and in surrounding environment.

B. External Size and Lower Cabinet Style:

1. Laminar Airflow Hood No.1: 74” W x 32” D x 80” H; console lower base. with casters.

[ADDM 01]

2. Laminar Airflow Hood No.2: 36” W x 27” D x 61-3/8” H; bench top model to sit on existing base cabinet.

3. Laminar Airflow Hood No.3: 48” W x 27” D x 35” H; bench top model to sit on existing base cabinet.

C. Controls: Manufacturer’s microprocessor-based control system with cleanable membrane touch-screen control panel mounted on the front of the cabinet and facing down towards operator while seated.

1. Audible and visual alarm and flashing LED to indicate unsafe condition whenever workbench performance departs from manufacturer's specified normal parameters.

2. Alarm mute switch on the front of the cabinet to allow a brief time for equipment loading in the work zone. Automatic reactivation of audible alarm after five minutes if the viewscreen sash remains at the improper height. The visible alarm to stay on until safe conditions are reestablished.

D. Illumination:

1. AireGard Laminar Airflow Hoods No.1 and 2: Externally-mounted fluorescent lighting fixture with solid state ballasts producing an average of 100 footcandles at work surface.

2. Purair Laminar Airflow Hood No.3: Compact LED cabinet lamp and built-in UV lamp.

E. Filters: One supply and one exhaust, scan-tested, zero-probe HEPA Filter, 99.99 percent efficient on 0.3 micron particles by DOP test, serviceable and removable from front of unit.

Exhaust filter also accessible from top of unit. Air balancing damper in filter housing with external control.

1. Prefilters: Manufacturer’s standard.

[ADDM 01] Vertical Airflow Stations 11 5355

H. Electrical Requirements:

1. AireGard Laminar Airflow Hoods No.1 and 2: Dedicated 115V, 60 Hz single phase circuit required. Pre-wired cabinet with a power cord terminated with a NEMA 5-20P plug; Power Cord: 14 GA-3 Wire, 15 amp.

2. Purair Laminar Airflow Hood No.3: 120V, 60 Hz single phase circuit required.

2.4. FABRICATION

A. General: Assemble each in factory to greatest extent possible. Disassemble cabinets only as necessary for shipping and handling limitations per manufacturer’s written instructions.

B. Cabinet Construction: 16 gauge, powder coated steel exterior finish; white color.

C. Worksurface and interior surfaces:

1. AireGard Laminar Airflow Hoods No.1 and 2: 16 gauge, Type 304 stainless steel work surface and sidewalls and top.

2. Purair Laminar Airflow Hood No.3: Stainless steel worksurface and top; polycarbonate, transparent, UV absorbing sidewalls.

C. Cabinet Assembly: Welded, gasketed and/or hermetically sealed joints for cabinet components.

D. Airfoil: Aerodynamic design at bottom of access opening, directing airflow into front grille.

E. Gaskets: Manufacturer's standard closed cell Neoprene, forming airtight and soap-bubble-tight seals to suit installation conditions and cabinet function.

F. Motor-Blower: Complying with NEMA MG 1; Variable speed, constant airflow 3/4 horsepower ECM motor with VFD controller. Position within BSC unit to promote even filter loading.

G. Supply Air Plenum: Air plenum of steel construction with acid-resistant finish. HEPA filters to be front loading, directly clamped, uniformly loaded, and sealed by closed-cell neoprene gaskets.

H. Air Diffuser and Filter Protector: Stainless steel assembly on top of the cabinet.

I. Filters: One supply and one exhaust, scan-tested, zero-probe HEPA Filters, 99.99 percent efficient on 0.3 micron particles by DOP test, serviceable and removable from front or top of unit.

[ADDM 01] Vertical Airflow Stations 11 5355

PART 3 - EXECUTION

3.1. EXAMINATION

A. Examine areas, with Installer present, for compliance with requirements for installation tolerances and other conditions affecting performance of biological safety cabinets.

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

3.2. INSTALLATION

A. Install airflow stations in compliance with shop drawings and manufacturer's written instructions.

B. For ducted (canopy and hard-connected) exhaust installations, set cabinet stand at the appropriate height in compliance with coordination drawings.

C. Connect to facility utilities.

1. Coordinate ductwork connections with work of section 23 3300.

2. Coordinate electrical connections with work of section 26 0500.

3.3. FIELD QUALITY CONTROL

A. Field certify vertical airflow stations, using procedures described in Annex F of NSF 49, current edition.

1. Certification Requirements:

a. Certification Requirements per “Certification/Commissioning and Test Requirements” in Section 01 4000, “Quality Requirements”, PART 3 attachment.

2. Use manufacturer’s recommended qualified certifying company: ENV Services, or as approved by manufacturer.

3. Perform the following tests directly related to containment (i.e., personnel and environmental protection), and product protection:

a. Downflow velocity profile test.

b. Inflow velocity test.

c. Airflow smoke patterns test.

d. HEPA filter leak test.

e. Site installation assessment tests, including:

1) Alarm functions as required by the referenced standard.

2) Exhaust system performance (proper exhaust duct negative pressure and canopy performance), as applicable.

B. Make the necessary corrections and retest units that do not meet specified standards.

C. Affix to the cabinet a certificate of satisfactory performance when the cabinet meets all field test criteria.

[ADDM 01] Vertical Airflow Stations 11 5355

3.4. ADJUSTING

A. Adjust moving parts for smooth, near silent, accurate sash operation with one hand. Verify that counterbalances operate without interference.

3.5. CLEANING

A. Clean finished surfaces, including both sides of glass; touch up as required; and remove or refinish damaged or soiled areas to match original factory finish, as approved by Architect.

B. Clean adjacent construction and surfaces that may have been soiled or damaged in the course of installation of work in this section.

C. Provide all necessary protective measures to prevent exposure of equipment and surfaces to other construction activity.

3.6. CLOSEOUT ACTIVITIES

A. Provide demonstration and instruction by manufacturer’s technical representative on each type of unit furnished.

B. Training: Train Owner's personnel on operation and maintenance of system.

1. Use operation and maintenance manual as training reference, supplemented with additional training materials as required.

2. Provide minimum of one hour of training.

3. Location: At project site.

[ADDM 01] Humidifiers 23 8413

PART 1 GENERAL

1.1. SECTION INCLUDES

A. General requirements specifically applicable to Division 20, 21, 22 and 23 sections, which apply in addition to Division 1 - General Requirements.

1.2. RELATED SECTIONS

A. Section 20 10 00 - General Mechanical Provisions

B. Section 20 20 00 - Mechanical Operation and Maintenance Manuals

1.3. SHOP DRAWINGS, PRODUCT DATA, OPERATION & MAINTENANCE DATA

A. Submittals required for the products listed in the Product Table, in accordance with Section 20 10 00. Operation & Maintenance Information required as indicated in the Product Table in accordance with Section 20 20 00.

B. Operation & Maintenance Information requirements indicated by number designation as follows. Refer to Section 20 20 00 for a description of each type of information.

1. Shop Drawings (submittal data)

2. Product Data (submittal data)

3. Manufacturer's Operation Manuals

4. Manufacturer’s Service and Lubrication Requirements

5. Service Contracts and Field Start-up Reports

6. Cleaning, Certification, and Test Reports

7. System Information

8. Warranties

PRODUCT TABLE

Operation & Maintenance Information

1 2 3 4 5 6 7 8

Humidifiers X X X X X X

Steam Distributors X X X X X X

[ADDM 01] Humidifiers 23 8413

PART 2 PRODUCTS

2.1. HUMIDIFIERS

A. Natural Gas:

1. Type: Dry steam, gas fired, condensing design.

2. Certifications:

a. NOx Rating: Ultra-low NOx certified to SCAQMD 1146.2 standards.

b. Construction: CSA/AGA/CGA ETL.

c. CE– Gas Appliance Regulation (GAR), LVD, EMC

d. Water control and capability: Certified for direct connection of potable cold water.

3. Warranty: Product shall be warranted to be free from defects in materials and fabrication for a period of two years after installation or 27 months from ship date.

4. Manufacturer and Model: DriSteem or approved. Model GTS LX Series.

a. Subject to compliance with requirements, other acceptable Manufacturer and Product as follows:

1) Condair GS OC (Outdoor Gas Fired Humidifier) [ADDM 01]

5. Performance:

a. Steam Capacity (PPH): Refer to Schedule on Drawings.

b. Thermal (combustion) efficiency: 94% HHV minimum.

c. Steam Distribution with specified distribution assembly: Non-wetting 19” with 58 F entering air

d. Capacity Control: Minimum 5:1 turndown.

e. Unit shall be of a condensing design utilizing a secondary heat exchanger to achieve average thermal efficiencies of over 93%.

6. Inputs:

a. Inlet Natural Gas Pressure: 0.25 - 0.5 psig (7-14 in. w.g.).

7. Features:

a. Capacity Control: SSR Modulating output.

b. Integral drain tempering.

8. Construction:

a. General:

[ADDM 01] Humidifiers 23 8413

1) NEMA 3 construction suitable for outdoor installation.

2) Steam connection inside enclosure

3) Stainless steel tank and steam outlet piping.

b. Fabrication requirements:

1) Tank and primary heat exchanger: 14-gauge 304-stainless steel with water side welded seams for all water-submerged welds.

2) Humidifier shall include a 316 stainless steel secondary heat exchanger to pre-heat inlet water and combustion air using exhaust gasses exiting the primary heat exchanger.

3) Tank bottom shall be slanted with drain port at bottom of tank to ensure complete draining.

4) Steam outlet on top of tank configured to connect to hose and pipe (NPT or BSP connection) for units up to 150 lbs/hr, and only pipe (NPT, BSP, or flange connection) for units from 200 lbs/hr to 600 lbs/hr.

5) Humidifier must be designed and approved by manufacturer to safely operate with PVC flue venting.

6) Unit shall include adaptable fittings to utilize PVC, CPVC, polypropylene inlet and flue venting material as required by local codes.

7) Include removable cover allowing easy access to water sensing assembly in the tank.

8) Tank shall have an easily accessible cleanout plate.

9) Indoor humidifier shall have a painted aluminum enclosure to protect all humidifier components and have an integral base with openings designed for moving humidifier with a forklift or pallet jack.

10) Humidifier tank shall be insulated with 1/2"-thick (12.5 mm), K-Flex closed cell insulation.

11) Units shall be capable of fitting through a nominal 36" (91 mm) wide steel door frame.

12) Humidifier shall have sealed combustion plumbed to the unit shroud.

c. Water type, fill, and drain requirements:

1) The humidifier shall be capable of generating steam from well, tap, softened, DI or RO water.

2) The humidifier shall not require changes to controls or components in the field due to changes in water type.

[ADDM 01] Humidifiers 23 8413

3) The humidifier shall sense water purity and automatically adjust drain rates accordingly to minimize tank maintenance and optimize water usage.

4) Fill and drain line piping shall include anti-siphoning mechanisms that prevent tank siphoning and potential inlet water contamination.

5) Humidifier shall incorporate a water surface skimming feature to drain away water surface debris and contaminants to minimize tank cleaning maintenance and risk of foaming.

6) An electric drain valve shall be mounted on humidifier assembly to allow tank to drain automatically at the end of a humidification season.

7) Provide complete tank draining with no standing water.

8) Minimum 5 gpm flow rate for fast draining.

9) The system shall monitor drain water temperature with temperature viewable on the unit’s display.

10) Integral water tempering control shall meter cold water at the drain in order to temper 212°F (100°C) water to a maximum 140°F (60°C) discharge temperature at full drain rate to sanitary system during normal operation.

11) Drain water tempering shall employ closed loop feedback using the drain temperature sensor to automatically control the drain and fill valves. Drain water temperature shall not exceed 140 °F (60 °C) while system shall minimize (cold) water usage by not excessively tempering.

12) Minimize drain and refill time by sensing when water is no longer draining (tank empty) to quickly initialize refilling of tank and subsequent re-start of humidification.

d. Burner assembly:

1) Humidifier and burner assembly shall be CSA/AGA/CGA/ETL certified and tested to support natural gas.

2) Gas train assembly shall be complete with burner/mixing tube assembly, igniter, sight glass, flame rod electrode, gas manifold, integral gas valve and venturi.

3) Each burner shall freely modulate with a gas input turndown ratio of at least 5:1.

e. Outdoor enclosure system:

1) Factory assembled and tested with the humidifier installed to provide complete weather protection and to operate within the following limits:

a) Temperature: -40 to 122 °F (-40 to 50 °C)

b) Sustaining winds: up to 40 mph without affecting combustion

2) Humidifier and outdoor enclosure shall be shipped as one unit.

[ADDM 01] Humidifiers 23 8413

a) Base frame construction: 14-gauge, G-90 galvanized steel formed frame, suitably reinforced and braced to permit loading, shipping, unloading and rigging to the unit destination without damage to external or internal components. The base frame shall be corrosion resistant without painting or further coating.

b) Housing construction: 18-gauge, G-90 galvanized steel panels fabricated into self-framing, double standing seam-type construction. All vertical panel joints, including the access panels, should have weather stripping applied to them.

All vertical stationary panels shall be caulked at the base weather-tight with a silicone sealant. All interior surfaces shall be insulated with 1" (25 mm),

2.2 lbs/sq ft (10.8 kg/m2) rigid, insulation. No exposed insulation shall be permitted on the top-wearing surface of the floor of the unit. The floor shall be insulated from underneath. There shall be a drain connection on the exterior of the enclosure.

c) Access panel construction: Access panels shall provide access to all internal components, be constructed of 18-gauge, G-90 galvanized steel weather stripping on the vertical panel joints.

d) Markings showing certifications, electrical warnings, and connections to gas, vent, combustion air, water supply and drain shall be provided on unit and protected from UV light damage.

e) Ventilation fans: Ventilation fans shall draw ambient air into enclosure and be thermostatically controlled to operate only when cabinet interior exceeds temperature setpoint.

f) Heaters:

(1) The enclosure shall have a thermostatically controlled heater to ensure proper operation during cold weather.

(2) Size heater to provide unit operation including freeze protection to 10F ambient temperature.

g) Roof curb option:

(1) Provide standard roof curb manufactured of 14-gauge, galvanized steel and provided with necessary hardware for bolt-together assembly.

(2) The curb is to be a minimum of 14" (356 mm) high. A 2" (50 mm) by 1/2" (13 mm) closed cell curb gasket with adhesive on one side is to be supplied with the hardware.

(3) Curb with treated wood nailer coordinated with seismic restraint mounting.

(4) Engineered curb attachment clips suitable for restraint of unit against seismic forces per Code and as indicated in Section 20 42 00.

f. Accessories:

1) High Limit Thermostat suitable for supply duct mounting.

[ADDM 01] Humidifiers 23 8413

2) Humidistat suitable for indoor wall mounting.

3) Air proving switch.

4) Condensate neutralizer: Flue condensate is acidic with a 2-4 pH range. Local code may require treatment prior to drain discharge. Provide a condensate neutralizer to treat condensate that forms in flue piping and the humidifier’s secondary heat exchanger. Neutralizer to contain media that neutralizes the condensate water, raising the pH to near neutral. The neutralizer shall be piped so to drain both flue and heat exchanger condensate to the neutralizer inlet.

Drain piping to and from neutralizer shall be unrestrictive to prevent condensate backup into humidifier heat exchanger. Neutralizer life shall be size to perform a minimum one year at 30% humidifier run hours, to be replaced when discharge condensate pH fall below 5.0.

g. Controls:

1) General: Microprocessor controller with BACnet connection capability.

2) Control subpanel: Control subpanel shall be factory-attached to humidifier with all wiring between subpanel and humidifier completed at factory. A wiring diagram shall be included.

3) Vapor-logic microprocessor controller with the following features or functions:

4) Touchscreen user interface shall be included standard on all models

5) Minimum 5” (125 mm) diagonal 800 x 480 24 bit RGB color display

6) Touch-sensitive screen control including swipe-scrolling of lists

7) Display operable within a temperature range of 32 to 158 °F (0 to 70 °C)

8) Animated graphical display of humidifier operating conditions

9) Icon-based function keys on screen with consistent Home option to facilitate navigation

10) Setup wizard, context-sensitive Help screens and output test functions for unit commissioning

11) On-screen QR Code links to humidifier installation literature

12) Prioritized color-coded alerts with time & date of occurrence, including log of up to 60 prior event messages.

13) Unit name information; editable with full qwerty on-screen keyboard.

14) Adjacent four-color LED status light of humidifier operating condition

15) Web interface and server, included standard on all models:

16) Web interface shall have same functionality as Vapor-logic touchscreen display

[ADDM 01] Humidifiers 23 8413

17) Web interface shall allow multiple remotely located users to simultaneously view system operation and/or change system parameters.

18) Web interface shall have password-protected secure access.

19) Web interface shall be compatible with standard Internet browsers.

20) Web interface shall be capable of connecting directly to a personal computer or through a system network via Ethernet cable.

21) Touchscreen display shall be factory mounted on humidifier. Provide UV protection for touchscreen with hinged sheetmetal cover or accessible display located inside unit case.

22) Provide multi-unit control option: System includes multiple humidifiers linked together supplying steam to one HVAC system and controlled as one humidification zone. Each touchscreen to provide status and control of all linked humidifiers.

23) Controller shall provide redundant humidifier over-temperature and flue over-temperature safety control using inputs from the tank temperature sensor and flue temperature sensor.

24) Humidifier shall have tank over-temperature switch and flue over-temperature switch operating independently of the tank temperature sensor and flue temperature sensor.

25) Include flue temperature sensing to temporarily reduce humidifier output if flue temperatures approach maximum, and to disable unit should maximum flue temperature be reached.

26) Controller shall provide fully modulating control of humidifier capacity.

27) Controller shall provide PID control capability with field-adjustable settings.

28) Water level control:

a) Automatic refill, low water cutoff, surface skimming and automatic drain-down of humidifier. System shall consist of:

(1) A water level sensing unit comprised of three metallic probes mounted in probe head. Probe head shall incorporate probe isolation chamber to eliminate fouling caused by mineral coatings.

(2) Fill valve assemblies factory mounted on the humidifier assembly.

(3) End-of-season drain automatically drains humidifier tank after a user-defined period of system inactivity.

(4) Tank temperature sensor: A factory mounted sensor, with a temperature range of -40 to 248 °F (-40 to 120 °C) mounted on the humidifier to enable the following functions:

[ADDM 01] Humidifiers 23 8413

(a) Maintain the evaporating chamber water temperature above freezing

(b) Maintain a user-defined preset evaporating chamber water temperature

(c) Allow rapid warm-up of water in evaporating chamber after a call for humidity, providing 100% operation until steam production occurs

(d) USB port on the control board and touchscreen for software updates, data backups, and data restoration.

(e) Up-time optimizer function to keep humidifier(s) operating through conditions such as fill, drain, or run-time faults, as long as safety conditions are met, minimizing production down-time.

(f) Real-time clock to allow time-stamped alarm/message tracking, and scheduled events.

(g) Factory commissioning of humidifier and control board, including system configuration as-ordered, factory unit testing, and operation with water before shipping.

(h) Alarms, unit configuration, and usage timer values shall remain in nonvolatile memory indefinitely during a power outage.

29) The capability to monitor, control, and/or adjust the following parameters:

a) Relative humidity (RH) set point, actual conditions in the space (from humidity transmitter), RH offset

b) Dew point set point, actual conditions in the space (from dew point transmitter), dew point offset

c) Relative humidity (RH) duct high limit set point (switch) and actual conditions

d) Relative humidity (RH) duct high limit set point, actual conditions (from transmitter), high limit span, and high limit offset

e) Total system demand in % of humidifier capacity

f) Total system output in lbs/hour (kg/h)

g) Drain/flush duration, allowed days, and frequency based on usage.

h) End-of-season drain status and hours humidifier is idle before end of season draining occurs

i) Window glass surface temperature (in % RH offset application using sensor ordered as an option) with programmable offset

j) Air temperature or other auxiliary temperature monitoring with programmable offset (using sensor ordered as an option)

[ADDM 01] Humidifiers 23 8413

k) System alarms and system messages, current and previous

l) Adjustable water skim duration

m) Programmable outputs for remote signaling of alarms and/or messages, device activation (such as a fan), or for signaling tank heating and/or steam production

n) System diagnostics that include:

(1) Test outputs function to verify component operation

(2) Test humidifier function, by simulating demand to validate performance

(3) Data collection of RH, water use, energy use, alarms, and service messages for download to USB.

(4) Password-protected system parameters

(5) Touchscreen display or Web interface displays in English, French, Spanish, Dutch or German languages

(6) Numerical units displayed in inch-pound or SI units

30) Humidifier Control Options

a) Interoperability using LonTalk.

b) Interoperable with any Modbus® network.

c) Interoperability using BACnet MS/TP or BACnet IP.

d) Multiple humidifier tank control. Vapor-logic shall be programmed and configured at the factory to control multiple humidifier tanks. Controller functions shall include all Vapor-logic functions listed above plus:

(1) The controller shall control up to 8 humidifier tanks.

(2) Automatic run-time balancing. The controller shall assign duty to all humidifier tanks in the multi-tank group such that each humidifier accrues approximately the same hours of duty, thereby ensuring equal wear across all humidifiers in the multi-tank group.

(3) One humidifier tank shall be capable of being controlled as a redundant tank.

(4) One Vapor-logic touchscreen display shall be included with each multi-tank group.

e) Removable touchscreen display option: Provide a touchscreen display with cable and quick-connect terminals for remote use. Available cable lengths: 5’ (1.5 m), 10’ (3 m), 25' (7.6 m), 50' (15 m), 100' (30 m) or 500' (152 m).

f) Control input accessory options:

[ADDM 01] Humidifiers 23 8413

(1) Humidity transmitter, room: Humidity transmitter shall be a room-mounted device that measures from 0 to 100% of RH range and provides a linear output (10% to 90% RH) from 4 to 20 mA. Accuracy ± 2% RH. Supply voltage 21 VDC. Operating temperature range: -4 to 140 °F (-20 to 60 °C).

(2) Humidity transmitter, duct: Humidity transmitter shall be a duct-mounted device that measures from 0% to 100% RH range and provides a linear output (10% to 90% RH) from 4 to 20 mA. Accuracy ± 2% RH. Supply voltage 21 VDC. Operating temperature range: -4 to 140 °F (-20 to 60 °C).

(3) Cold snap offset transmitter: A window surface temperature transmitter, operating temperature range -20 to 160 °F (-29 to 71 °C), shall be provided for field installation. Transmitter shall supply its signal (4 to 20 mA) to the microprocessor control system, which shall lower the indoor RH set point to a level 5% or more below the dew point temperature during a cold spell, thus preventing window condensation.

The indoor RH shall be automatically returned to the normal setting when the glass temperature rises.

(4) Humidistat, on-off, high limit: Electric humidistat control shall be an on-off style, duct mounted with a control range of 15% to 95% RH. Compatible with 24, 120, and 240 VAC. Operating temperature range 40 to 125 °F (4 to 52 °C).

(5) Modulating high limit control: The modulating high limit control system shall include two modulating electronic humidity transmitters (one space-mounted, the other duct-mounted downstream of the humidifier). Both shall transmit to the microprocessor controller to modulate humidifier output and maintain the highest desired space humidity possible, at all airflow volumes, without saturation of the airstream. (For this application, it is recommended to use a sail type airflow-proving switch.)

(6) Airflow proving switch, pressure type: Airflow proving switch shall be diaphragm-operated with pitot tube for field installation. Switch shall have an adjustable control point range of 0.05" to 12" wc (12.5 to 2988 Pa) Operating temperature range -40 to 180 °F (-40 to 82 °C). Compatible with 24, 120, and 240 VAC.

(7) Airflow proving switch, sail type: Airflow proving switch shall be a sail operated electric switch for field installation. Switch makes @ 250 fpm (1.3 m/s), breaks @ 75 fpm (0.4 m/s). Maximum operating temperature for sail: 170 °F (77 °C). Maximum operating temperature for switch:

125 °F (52 °C).

2.2. STEAM DISTRIBUTORS

A. Type: Not-wetting distribution tube assembly in frame arranged for mounting in existing air handling unit.

B. Features:

1. Galvanized steel frame.

[ADDM 01] Humidifiers 23 8413

2. Integral steam supply header/separator.

3. Insulated dispersion tubes.

4. Condensate collection header.

5. Tubes and headers 304 stainless steel.

6. Tubes joined to headers with slip fit to facilitate replacement.

7. In-frame condensate drain.

8. Float and thermostatic (F&T) steam trap.

9. Manufacturer and Model: Dristeem Rapid Sorb or approved.

PART 3 EXECUTION

3.1. GENERAL

A. Install products in accordance with manufacturer's recommendations.

B. Coordinate electrical connections with Division 26.

C. Humidifiers including piping and distribution grid shall be removed and installed when laboratory and ambient environmental conditions require no supplemental humidification.

Coordinate with Owner’s operations personnel to verify humidification needs based on trending of operation of existing humidifiers by existing Building Management System.

Coordinate with Owner for allowable shutdown durations and times for AHU-3 shutdown for demolition and replacement of humidification grid and steam piping.