Attachment 1 SOW DRAFT.pdf

DRAFT SCOPE OF WORK

HVAC REPLACEMENT –WHITE SWAN DENTAL CLINIC

I. OVERVIEW

A. SITE LOCATIONS

Indian Health Service, White Swan Dental Clinic

62 Birdsong Lane, White Swan, WA 98952

See Attachment E: Sitemap.

B. PROBLEM STATEMENT

The White Swan Dental Clinic is a 1,775 SF modular building. Two Lennox 15CHPXA-36-230-

2A residential HVAC units provide heating, ventilation, and air conditioning (HVAC) for this space. A recent inspection discovered that these units do not provide any fresh-air ventilation required by code. Additionally, the dual unit configuration does not provide a practical space conditioning strategy, as contrary heating and cooling conditions may occur simultaneously.

C. OBJECTIVE

This project will replace the two existing Lennox Heat Pumps with a single right-sized, code compliant unit. Proposal pricing shall be based on current equipment sizing. A modification will be considered to add or reduce project costs should the equipment size vary. It will also install new ventilation grills to allow for air balancing.

After installing new HVAC equipment, this project will conduct a Test, Adjustment, and Balance

(TAB) project to ensure all spaces receiving code-compliant ventilation and temperature standards are met.

D. WORK SUMMARY

1. Heat-loss analysis and calculations for HVAC sizing.

2. Hazard Inspection.

3. Replace two existing units with a single unit.

4. Replace ventilation grills for balancing.

5. Complete startup on the new system to assure it is operating correctly.

6. Perform TAB to ensure ventilation requirements are met.

7. Provide operations and maintenance training to staff.

8. Provide operation and maintenance reference material.

II. TECHNICAL REQUIREMENTS

A. CODES, REFERENCES, AND STANDARDS

Work performed under this contract shall comply with the current version of all codes, references, and standards listed below.

1. ASHRAE Fundamentals

2. ASHRAE 90.1

3. ASHRAE 170

4. ASHRAE 62.1

5. NFPA 70, National Electric Code

6. International Building Code (IBC)

7. International Mechanical Code (IMC)

8. Environmental Protection Agency (EPA) Section 608

B. SUBMITTALS

The Contractor shall provide submittals on the items listed below. COR approval is required before proceeding with the portion of work to which the submittal applies.

1. Pre-Construction

a. Project Schedule

b. Contractors Safety and Accident Prevention Plan / Asbestos Inspection /

Hazardous Waste Management and Disposal

c. Kickoff Meeting

2. Heat Load Analysis

a. Design assumptions, including ASHRAE weather-station data and building R-values.

b. Load calculations. Include psychrometric worksheets & checksums.

c. Equipment recommendation.

3. Equipment

a. Packaged HVAC equipment

b. Refrigerant data

c. Controller & thermostat

d. Pressure sensor

e. Ductwork

f. Ventilation grills

4. Post-Construction

a. Warranty Information

b. Startup Report

c. TAB Report

d. Operation and Maintenance Binder

C. EQUIPMENT SPECIFICATIONS

Packaged Exterior HVAC Unit: Trane Precedent RTU with Horizontal Conversion is an approved

RTU type.

1. The packaged unit must have a minimum SEER rating of 13 or meet ASHRAE Standard

90.1, whichever is greater.

2. The unit shall have scroll compressors with variable/modulating speed capacity.

3. The unit shall be equipped with the sensors required to meet all inputs shown on

Attachment B: Economizer and Control Requirements.

4. The equipment shall be capable of horizontal flow to match ductwork needs.

5. The equipment shall have hinged access panels with neoprene gaskets.

6. This system must use a widely available EPA-approved refrigerant that is locally supported and does not expect to be phased out. If a blend refrigerant is proposed, it must be azeotropic or have a minimal temperature glide.

7. Minimum 5-year manufacturer warranty.

Economizer

1. Provide an economizer package capable of modulating fresh air ventilation based on outside air temperature and differential pressure.

2. The economizer shall be equipped to accept a BACNET capable DDC signal of 0-10V.

3. Include an economizer rain shield and screen suitable for 100% outside air.

4. The economizer shall be equipped with a barometric relief damper. This damper shall be capable of activating at differential pressures greater than or equal to +4 in.wg.

Controller & thermostat:

1. This system must incorporate a BACNET controller capable of actuating the economizer based on building pressures and outside temperatures. Two approved product types are the Honeywell Spyder Controller with TR-75 wall sensor or Carrier I-VU AppController.

Other control packages will be considered with COR approval. See Attachment B:

Economizer & Control Requirements – Sequence and Priority Operations for specific applications.

2. The control system must provide a visible cue when in freeze-protection mode. An LED indicator on the indoor pressure transducer location is an acceptable solution.

3. The control system must be programmable by local facilities.

Ventilation grills:

1. Provide adjustable ventilation grills with opposed double deflection blade dampers.

2. TITUS 272R is an approved product type. Alternate products will be approved based on equal or greater characteristics of the 272R.

3. These grills shall be installed to provide a method of adjustment during TAB.

Pressure differential sensor:

1. Provide differential pressure transducer capable of monitoring building pressures.

2. VERIS PX3 is an approved product type. Alternate products will be approved based on equal or greater characteristics of the PX3.

Ductwork:

1. New exterior ductwork shall meet SMACNA requirements.

2. Provide turning vanes in any section of external ductwork where a 90° turn is required.

3. Provide balancing dampers for airflow distribution between the east and west trunk lines.

A. QUALITY ASSURANCE

1. An EPA 608 certified technician must perform all work involving refrigerants.

2. All HVAC equipment shall be listed by the Underwriters Laboratory (UL).

3. Only standard or premium labeled equipment will be considered for installation. Low-grade or budget equipment will be rejected.

4. The contractor shall provide a minimum 2-year labor warranty on all new work.

B. WORK EXECUTION REQUIREMENTS

Hazard Inspection

1. As part of preparing the Safety and Accident Prevention Plan, the contractor shall inspect work areas for potential safety hazards and hazardous materials consistent with the health and safety regulations applicable to this Contract. This includes inspecting for Asbestos

Containing Materials (ACMs) before any renovation or demolition work.

2. The asbestos inspection shall be completed by a State Licensed Asbestos Inspector consistent with 40 CFR Part 61, Subpart M (Asbestos National Emission Standards for

Hazardous Air Pollutants (NESHAP).

3. The outcome of the Contractor’s inspection of the work area shall be included with the

Safety and Accident Prevention Plan submittal. In the event that new suspected or confirmed hazardous materials are found during the Contractor’s inspection, a Contract

Modification shall be negotiated to assure the requirements of applicable health and safety regulations are met.

Load Calculations:

1. Evaluate the building envelope materials and conditions to determine heat gain/loss from the exterior and determine all internal heat loads per ASHRAE Heat Balance Method or by using approved software, such as Trace 700 or Carrier HAP. Other programs may be used with prior COR approval.

a. Existing equipment sizes may be used for bidding purposes. The expectation for this project is that the load calculations will result in an equal or reduced heat load requirement. If significant deviations are discovered from these actions, then a modification will be negotiated.

b. Minimum & outdoor ventilation rates shall be obtained from Attachment A:

Ventilation Schedule.

2. Determine equipment based on the expected heat and cooling loads and ventilation requirements and provide a submittal with the recommended equipment.

Exterior Units:

1. Evaluate outside equipment location to ensure compatibility with new equipment. Notify

COR immediately if any discrepancies are found that will impede installation.

2. Following EPA-608 regulations, capture and dispose of or recycle refrigerant and oil.

3. Remove exterior units and dispose of them in an EPA-approved landfill or recycling facility.

4. Demolish exterior ductwork not planned for reuse with the single new unit.

5. Install a new single unit in a location suitable for attachment to the electrical panels and the ductwork.

6. Install economizer package.

7. Install auxiliary heating package, if indicated by the heat load analysis.

8. Fabricate and install new ductwork with turning vanes and balancing dampers.

9. Seal and insulate ductwork to match existing.

Ventilation grills:

1. Remove all supply ventilation grills and dispose of them.

2. Install new double deflection grills and adjust to maintain a throw pattern matching what was removed.

Control System and Pressure Transducer

1. Discuss the location for the installation of control equipment and pressure transducer with the COR and Facility Manager. Once a location is approved in writing from the COR, install and wire per the manufacturer’s requirements. All equipment must be installed in housing system that is approved by the manufacturer and equipped with a lock.

2. Program the control software, thermostat, and economizer to operate with the parameters described in Attachment B: Economizer and Control Requirements.

Startup and TAB:

1. Perform equipment startup and checklists per the manufacturer’s instructions and procedures. Provide Startup report submittal.

2. Perform testing, adjusting, and balancing (TAB) project following ANSI/ASHRAE

Standard 111-2008 – Practices for Measurement, Testing, Adjusting, and Balancing of

Building Ventilation, Air-Conditioning, and Refrigeration Systems.

3. The Contractor shall use standards reporting forms that meet the format and content to conform to AABC or NEBB for the TAB report.

4. In addition to AABC or NEBB requirements, The TAB report shall contain the following information:

a. Summary of the overall TAB effort, including the TAB crew and the equipment and methods used.

b. Equipment calibration test dates and results

c. Overall results of the TAB effort.

d. Equipment items that are not in compliance and could not be brought into compliance with adjustment.

e. Provide report in .pdf format. Publication on paper is not required.

f. IHS shall have 5-business days to review a complete report

5. To prevent air leakage, the Contractor shall plug all holes made in the ducts for taking test readings. Disruption of duct, pipe, and/or equipment insulation shall also be appropriately repaired by the Contractor.

6. Balancing tolerances must maintain the minimum or greater design airflow differential to maintain a positive or negative pressure relationship in each pressure zone.

7. Measure and verify that design quantities of exhaust air are met for all exhaust systems.

Closeout

1. Operation and Maintenance (O&M) Manual

a. Submit copies of Operation and Maintenance Manuals before applicable demonstrations and training.

2. Warranty

a. Provide warranty information. If the manufacturer requires registration for warranty tracking or offers upgrades as a result of registration, provide all registration information and instructions on how to submit.

3. Closeout Meeting

a. The Contractor shall coordinate a closeout meeting with the COR and Facility

Manager.

b. Provide Operation and Maintenance (O&M) Training, including topics that focus on control and programming operations.

II. ATTACHMENTS

A. Ventilation Schedule

B. Economizer & Control Requirements – Sequence and Priority Operations.

C. Building drawings

D. Site Photos

E. Site map