SOW RTU.pdf

US EMBASSY PARAMARIBO, SURINAME

STATEMENT OF WORK

For

MECHANICAL SERVICES

Warehouse, Shop and Gym HVAC equipment Replacement

26 JULY 2024

1. GENERAL REQUIREMENT

The project is described as “Warehouse, Shop and Gym HVAC equipment Replacement”. The United States Department of State (DOS) requires engineering and construction services to remove and replace three (3) curb mounted roof top units (RTU’s) installed on the warehouse, Workshop and Gym at the U.S Embassy Compound in Paramaribo Suriname. The buildings are one (1) story buildings located around the perimeter of the compound. The intent is for the new RTU’s to fit on the existing to remain RTU curbs. The contractor shall remove and properly dispose of demolished equipment and materials or otherwise instructed by COR or Facility manager. This work will also include any necessary modifications to the building’s roofing/flashing, electrical, and HVAC systems and their associated components. The anticipated project schedule will be provided during the pre-bid walk thru. The contractor shall furnish services under task orders issued by the Contracting Officer.

I. BACKGROUND

The Roof top units located at the warehouse, workshop and the Gym is required to be replaced, due to the local weather condition, high level of moisture and salty environment along the coast where the salts have negatively impact coil fins and metal enclosures /surfaces.

II. SOLUTION

The intent is for the new RTU’s to fit on the existing RTU curbs. All roof top unit should be replaced with specials coating to increase life expectancy, to include condensing coils protective layer e.g., OEM factory e-coats and spray-applied coatings. This coating process is both cost-effective and provides a long-term solution against corrosive agents and can also include anti-microbial properties.

III. GENERAL CONDITIONS

CO: Contracting Officer

COR: Contracting Officer’s Representative FM: Facility Manager

RSO: Regional Security Officer

POSHO: Post Occupational Safety and Health Officer

APOSHO: Assistant Post Occupational Safety and Health Officer

1. Contracting Officer Representative:

A Contracting Officer’s Representative (COR) will be assigned to ensure quality assurance goals are met.

2. Fixed-Price Proposal:

This contract is an engineering and construction services contract with firm-fixed prices. Task orders will be priced and payable entirely in the currency indicated in the SF1442. The Government will not pay any additional sums due to any escalation in the cost of materials, equipment, or labor, or because of the Contractor's failure to properly estimate or accurately predict the cost or difficulty of achieving the results required by this contract. Nor will the contract price be adjusted due to fluctuations in the currency exchange rates. The Government will make changes in the contract price or time to complete only due to changes made by the Government in the work to be performed, or by delays caused by the Government.

3. Work Criteria:

The Work shall be governed by referenced standards and drawings contained within this Scope of Work.

- A pre-bid walk-thru will be coordinated with invited bidders by the PD/COR and the Paramaribo Post Facility Manager (FM). The project schedule, along with other miscellaneous project specifics will be reviewed during the walk thru.

-The contractor is responsible to take field measurements, take notice of existing condition and carefully compare the contract documents with such field measurements.

-Notify the COR in the event of conflicting work criteria. In general, the more stringent criteria shall be applied, subject to COR approval.

-The contractor is responsible for compliance with all design criteria and development of Quality Assurance/Quality Control Plan

-Work not in compliance shall be deemed unacceptable.

-After contract signing, the contractor should submit the following documents to the client for approval:

• Work Method Statement per work: the work procedure, quality control plan, health, and safety plan.

• Construction Plan: time schedule and cash flow estimate, personnel, and equipment.

• Site plan: location of facilities for the contractor and supervisor and location for storage of equipment and materials.

The contractor shall perform all work necessary to produce a complete set of plans and technical specifications sufficient for the tasks described in this project. No work shall be initiated until the Government has provided review comments under each submittal. The contractor shall provide electronically all comments and the actions taken in response to the comments.

The Government reserves the right to modify the contract to add services that may be required of the contractor during actual construction of the project.

4. Execution:

The Work shall be executed in a diligent and skillful manner in accordance with the negotiated fixed price, this Scope of Work, and the Project Schedule.

This HVAC equipment repair by replacement scope will be split into two (2) basic phases, with the first being, Engineering and Construction Documentation Services and the second being Construction Services. The first phase will include developing construction documents capturing the installation intent and construction phases, which shall include site plans, demo / new work plans, equipment cut sheets, and relevant engineering calculations. Following approval of construction documents, the second phase (construction services) work will include installing new packaged RTUs, temporarily shutting down systems to switch over service to new RTUs

When pursuing the work, the contractor is to take extra care as not to damage existing structures. The contractor is responsible for preventing any damage to surrounding properties arising from the Contractors performance of the work.

Contractor shall be responsible for repairing any damage to adjacent properties because of its activities on the Project Site. If the damage is not repairable, the cost will be calculated by the Facility Manager and deducted from the payment of the final invoice.

5. Work Hours:

The contractor shall work 5 days a week between the hours of 7:30 AM and 4:00 PM.

If any aspect of this work is deemed by the COR, the FM, the RSO or the POSHO/APOSHO to be interruptive of normal embassy operations, the Embassy security or safety, the contractor shall be required to perform that portion of the work on Saturdays and Sundays.

6. Safety:

The contractor shall be responsible for conducting the work in a manner that ensures the safety of employees, visitors at the US Embassy, and the Contractor’s employees

The contractor shall be solely responsible for risk assessments, managing health, and safety issues associated with this project. Based on hazard assessments, Contractors shall provide or afford each affected employee personal protective equipment (PPE) that will protect the employee from hazards.

At a minimum PPE shall consist of eye protection, hard hats, and closed toe shoes. Sandals or athletic shoes are not acceptable. PPE such as gloves, dust masks, are recommended. These items must be provided at the Contractor’s expense.

Workers may use discretion if they feel unsafe in using the equipment in a hostile environment.

Any worker at an elevated location above 1. meters, except for a portable ladder, must be provided and utilize a safety harness.

The contractor must document in the bid for work how the hazard controls will be implemented and maintained during the project.

The Contractor shall prepare and implement an Activity Hazard Analysis (AHA) prior to the start of work.

The Contactor must have a competent person on-site for inspection of equipment, training workers in the safe use of equipment and the recognition of hazards related to their use, supervision, and identifying and correcting unsafe work practices for high hazard work.

All contractor personnel shall wear hard hats, safety glasses, earplugs, gloves, close-toes shoes, and any other Personal Protection Equipment deemed necessary by the Facility Manager.

Safety Training:

1. Provide specific training to supervisory personnel and all craft workers of the contractor and subcontractors in proper use and care of specific personal protective gear, equipment, and clothing.

2. Contractor and subcontractor employees shall be trained and supervised by qualified persons to perform, safely and confidently, recognized hazardous work operations and work performed with hazardous conditions to which they have been assigned.

7. Workforce:

The contractor shall provide all supervision, skilled and unskilled labor needed to perform the work.

The contractor shall be responsible for total integration of effort and control of the works. The contractor shall be responsible for planning, monitoring, coordinating, and controlling the works.

The contractor shall provide a Project Superintendent with a minimum of 5 years professional employment record of demonstrated performance in comparable work. Project Superintendent shall have experience in all aspects of work execution.

The contractor shall provide Foremen and other supplemental staff as necessary to perform the work within the timelines and quality standards specified. Staff shall demonstrate knowledge, skill, and experience with the construction methods, techniques, and standards required by the contract.

8. Accommodations:

Toilets: The contractor may utilize guard toilets for the workers located in the CAC, s or as instructed.

The contractor shall ensure they stay clean and usable.

Drinking water: The contractor shall also provide an adequate number of drinking water dispensers, distributed for convenience and efficiency-of-use around the construction areas. Always maintain supply of disposable paper cups at each dispenser.

9. Subcontractors:

Contractor shall be responsible for the conduct and workmanship of Subcontractors engaged in the Project, and for Subcontractors compliance with the terms of this Statement of Work. The contractor is responsible for the behavior and workmanship of Subcontractors while on US Government property.

10. Modification to Contract:

The Contractor shall not incur any costs beyond those described in this SOW unless directed otherwise in writing by the Contracting Officer.

Any work performed by the contractor beyond this SOW without written direction from the Contracting Officer will be at the Contractor’s own risk and at no cost to the Embassy.

11. Stop Work:

At any time during the Project, the Contracting Officer (CO) reserves the right to Stop Work for protection of employees or visitors, security, or any other reason at his/her discretion.

12. General Submittals:

The contractor is responsible to submit a hazard control measure plan for the work.

The contractor is also responsible to submit a detailed construction schedule indicating when the various portions of the work will be commenced and completed within the required schedule in the form of a bar chart. This bar chart shall be in sufficient detail to include all significant milestones.

The new equipment shall be procured only after receiving approval on pre-requisite submittals (e.g., Issued for Construction (IFC) Drawings, Equipment Submittals) by the COR.

The contractor shall provide the detailed qualification of all the key personnel.

1. All submittals require approval by the Facility Manager before commencing activities. Contractor must provide a chronograph work schedule with the proposal for the project.

2. Contractor must specify in his Quote/Bid: labor cost, the term/ timeframe of each specific categories as indicated in the line items.

3. Once job is finished, contractor will inform the U.S. Embassy to inspect and approve the work performed.

13. Close-out:

Prior to final acceptance, the COR will conduct a QA/QC inspection to check compliance with the

SOW.

14. Housekeeping:

The contractor is responsible to clean up daily. The contractor is responsible to dispose of all dirt, concrete, stone, and construction debris outside of the property before the close of business each day.

Any dirt, concrete, stone, and other construction debris may not be piled on the ground. Immediately upon removal, it must be loaded into a truck and disposed of immediately once the vehicle is full. At the end of the day even partially loaded trucks must be removed from the US Embassy compound and the contents disposed of properly at authorized dump sites.

The contractor shall coordinate and supervise the protection, cleaning, and maintenance work at the Project Site during receipt, handling, storage, installation, curing, and similar stages of construction execution to affect minimum exposure to hazards by personnel and minimum deterioration to the Embassy compound.

15. Notification to Proceed:

The Contractor Shall Start Work Within 14 Days of Notice to Proceed.

Within 5 days of Notice to Proceed (NTP), the contractor shall provide the COR a project schedule showing start to completion dates including significant milestones.

Within 10 days of NTP, the Contractor shall provide the COR with details of the proposed installation utilizing written description or sketches or both.

16. Point of Contact:

The COR shall be the main point of contact for this Project. The Contractor shall report to the COR on (a) status of the Project, (b) changes in Schedule, (c) accidents and safety issues, (d) disruptions to the property accessibility; and all other essential information pertaining to the Project.

17. Contractor’s Representative:

The Contractor shall provide a representative on-site during all working hours with the authority to make all decisions on behalf of the Contractor and subcontractors.

18. Site Security:

The contractor shall comply with US Embassy security policy.

The contractor shall prepare list of all the names of personnel working for the contractor and any subcontractors, with national ID numbers and submit the list to the Facility Manager for vetting of employees by the RSO at least 30 days prior to commencement of work.

The contractor shall also provide a list of all equipment, listing the manufacturer, model, serial number of all equipment to be used on this project at least 7 days prior to the commencement of any work. Any vehicles utilized by the contractor are also considered equipment. The contractor must provide make, year, model number and license plate number. All vehicles will be inspected prior to entering and prior to leaving the premises.

The COR will assign a holding area for the equipment. Equipment, other than vehicles, should remain on site for the duration of the project to avoid having to have a security screening of it each time it enters the compound.

Any vehicle that is leaking oil will be immediately removed from the compound.

The contractor must notify the COR in writing at least 24 hours in advance of the pending removal of any contractor owned equipment.

The contractor is 100% responsible for securing their working materials and equipment. Any damage to facilities or infrastructure, which happens due to a lack of security, will be the responsibility of the contractor to correct at no cost to the U.S. Government.

The following considerations must be followed by the Contractor:

- All documents received or generated under the contract are the property of the US Government.

- Reproduction and distribution is prohibited without express approval of the US Government.

- Proposed and actual contract documents will only be disseminated on a strict need-to-know basis and will not be further disseminated without prior authorization from the US Government.

- Contractor personnel receiving contract drawings will be responsible for these materials while in their possession, or that of any of their subcontractors.

- Photographs of any public area of any US Diplomatic Facility must be approved and authorized in advance by the RSO. The RSO will establish control, limits or restrictions as deemed necessary. The contractor shall submit a written request for photographs.

19. Coordination Meetings:

Pre-Construction Conference: The COR shall conduct an initial construction conference on or near the date of Notification to proceed. Agenda items shall include a review of the general plans, conditions, procedures, and requirements as shall be necessary for the effective scheduling and prosecution of the construction work. Further, all parties shall review security and material delivery requirements, personnel assigned, and contract communication procedures as have been established for the Project. This meeting shall be scheduled and conducted at the place agreed to by the COR and the Contractor.

Construction Coordination Meetings: The contractor and COR will hold weekly construction coordination meetings to discuss schedule and status of outstanding issues. Weekly coordination meetings shall commence immediately upon mobilization to the Project Site. All parties shall seek the expeditious resolution of issues before they become problems. Progress of the work shall be reviewed. contractor shall revise, balance, and submit an updated project execution.

This review shall be based upon a subset report of the Project Execution Schedule in which all project execution activities have been entered. This review shall include:

• Status of continuing activities.

• Recent activity starts since last meeting.

• Activity planned completion dates.

• Activity interruptions.

• Activity completions.

Activity interruptions should include the reason for the interruption.

An activity will be considered complete only when it has been approved by the COR.

The contractor shall prepare a detailed written record of all conferences and meetings with representatives of Post related to the project. A copy of these records shall be submitted to the COR within 5 workdays of the event.

20. Defects in Work:

Where the Contractor’s QC procedures, or those undertaken by or for the USG, disclose patent or latent defects in the works, the contractor shall provide corrective actions. The contractor shall seek to repair, restore, reconstruct, replace, or otherwise correct defects in the works to comply with Contract Document requirements and criteria.

The corrective action shall be acceptable to the COR.

Provide re-inspection or re-testing of corrected work, repeat until compliance is achieved.

Neither the required quality control procedure, nor detection of defects, nor correction of defects, nor the re-inspection or re-testing of corrected work, provides a basis for Contractor's claim for Contract Modification/Additional Compensation, or request for extension of Contract Time.

21. Delays:

Delays that are found to be caused by the Contractor's actions or inactions shall not be a cause for a time extension to the contract completion date.

If the contractor's execution of the works falls behind the accepted Project Execution Schedule, the contractor shall take all steps necessary within the agreed work period parameters to improve progress. These attempts at recovery shall incur no additional cost to the USG. The contractor shall execute the works diligently and shall seek to complete all works at or before the agreed upon contract completion date.

The proposed contractor must submit with the proposal a construction schedule (chronograph) of the proposed work. If selected, the contractor must adhere to the construction schedule. Any delays will be penalized by USD 500.00 (five hundred north American dollars) per day for any delay deemed to be unreasonable by the COR.

22. Invoicing and Paying Instructions:

The contractor shall submit invoices in the original and three copies to the designated billing address indicated in the contract. The COR will determine whether the invoice is complete and proper as submitted. The COR also will determine whether billed services have been satisfactorily performed and whether reimbursable expenses billed are correct. If the amount billed is incorrect, the COR will, within seven days, ask the contractor to submit a revised invoice.

The contractor shall specifically identify its last invoice as ‘’Final invoice.’’

The final invoice shall include the remaining payments due under the basic contract and all modifications issued. The final invoice shall also attach a ‘’Contractor’s release’’.

2. SCOPE OF WORK

A. Site Organization:

1. The contractor shall have at least one safety monitor / traffic flagger to keep pedestrians out of the work area.

2. Install new barricades to delineate the project area.

B. Work Execution:

1. Coordinate all phases and aspects of the works carefully to achieve intended results, including best overall visual effect. Remove and replace workmanship and/or material that are found to be not in compliance.

2. In all aspects of the work, fully comply with construction safety and occupational health requirements.

3. Should there be a discrepancy between the U. S. Government Specifications and the applicable Building Code, the more stringent of the two shall govern.

4. The contractor is responsible for compliance with all Building Codes; work not in compliance with the Codes shall be deemed to be unacceptable.

5. Explosive Actuated Tools are not permitted.

6. Remove and properly dispose of the three (3) existing RTU’s and associated materials. Unless otherwise dictated by the PD/COR, the contractor should expect to only be able to work on one (1) CAC at a time to minimize the impact to normal operations.

7. Provide and install three (3) new RTU’s and associated devices, such as new electrical disconnects, thermostats, canvas/flex connections, p-trap and local condensate piping, etc.

8. Contractor shall use existing roof penetrations for new outdoor air (OA) intakes and controls wiring.

In addition to the new equipment: rigging, ductwork, duct connections, duct accessories, piping, piping accessories disconnect switches, electrical whip connectors, thermostats, controllers, and controls wiring are also included. Mechanical, electrical, light carpentry, roofing/flashing, and painting are involved. Test, Adjust, and Balance (TAB), Factory Representative Start-up, and basic adjustments of the new equipment are part of the Work.

9. Building Codes. Work is governed by the latest version of the International Building Code (IBC) and the OBO Supplements, which includes the International Mechanical Code, International Plumbing Code, and National Electric Code. Work shall comply with OBO standards and local jurisdictional requirements. Work not in compliance with the IBC and NEC shall be deemed not in compliance with the Contract.

Included with this Statement of Work narrative are attached exhibits including (Exhibit A) photos of existing conditions/equipment, (Exhibit B) existing York RTU literature, (Exhibit C) sketches of demolition and new work requirements, (Exhibit D) construction specifications.

Project Orientation Photos. See Exhibit A for orientation photos of existing equipment/systems.

Shipping: The Contractor is responsible for shipping, delivery, and storage of all tools, materials, and equipment to the Work site.

Damage caused by the Contractor will be returned to original condition at the expense of the Contractor.

The Contractor shall maintain existing systems in service to the maximum extent possible and coordinate interruptions of any utility services in advance with the Facility Manager.

Handling / charging of refrigerants for use in air conditioning systems shall comply with U.S. and Paramaribo, Suriname laws and regulations.

If needed for reference, available existing design/construction documentation, including AutoCAD files of the buildings to be worked at may be provided by the PD/COR if requested by the contractor.

Availability and accuracy of existing files cannot be guaranteed.

The contractor shall provide submittals for all new equipment, materials, and chemicals. See included specifications exhibit for additional information.

C. Warranty:

1. The contractor shall correct any noted discrepancies by the COR within 7-days of being notified at no additional cost with the 12 months warranty period.

2. The contractor shall guarantee all the work that is performed under this contract, including all materials, workmanship, for a minimum of 12 (twelve) months from the date of full acceptance of the work.

3. The contractor is required to submit a copy of a warranty for a period of twelve months at no cost to the Embassy signed by the contractor.

4. The contractor shall provide warranties on all equipment, materials, and workmanship. See included specifications exhibit for additional information.

D. Utilities:

The contractor will have access to water and electricity on site. The electrical supply at the US Embassy is a 120Volts supply however the wall female sockets are American Nema-6 wall plates.

Limited storage will be provided for equipment and material; however, the US Embassy holds no responsibility for contractor’s equipment stored onsite.

E. New Work:

General requirements

1. The new equipment shall be procured only after receiving approval on pre-requisite submittals (e.g., Issued for Construction (IFC) Drawings, Equipment Submittals) by the COR.

2. The contractor shall also provide formal training to the Facility Manager (FM) and locally employed embassy staff, which shall include a detailed project specific preventive maintenance plan and operations / maintenance manuals.

3. All new equipment shall be installed and fully commissioned within 2 months after arrival at post.

The Contractor shall provide a schedule to the project COR for review and approval.

4. Provide workers, equipment, and materials necessary to replace three (3) existing Roof Top Units (RTU’s) with three (3) new RTU’s. Trades shall include, but may not be limited to mechanical, electrical, roofing/flashing, carpentry, and painting.

5. In addition to the providing the new mechanical and electrical equipment; duct work, duct connections, miscellaneous duct accessories, piping, piping connections, valves, gages, thermostats, miscellaneous piping accessories, disconnect switches, circuit breakers, electrical conductors, thermostats, controls wiring, and other miscellaneous materials are part of the Work.

6. All used equipment, debris, trash, and hazardous materials will be removed from the property and disposed of properly by the contractor. At a minimum, materials shall be removed weekly. Locations for dumpsters are not guaranteed. Access for trucks/dumpsters shall be coordinated with the PD/COR and FM. The Contractor is responsible for ensuring that disposal of equipment, debris, and hazardous material complies with the laws and regulations Paramaribo, Suriname.

7. Start-up and commissioning of the new units is part of the Work. All mechanical and electrical functions at the mechanical equipment and at the thermostat(s)/controllers will be verified in all modes. Start-up and commissioning shall be completed with the FM or designated technical staff in attendance. Coordinate with PD/COR and FM.

8. Crane Study. The Contractor shall submit the proposed crane entry path and staging location in a graphical (site plan) format for review by the COR and FM. The contractor shall confirm an adequately sized crane can fit through the service CAC / compound entrances.

9. Demolition Plan: Show required demolition of existing architectural, mechanical, and electrical elements, and equipment.

10. Proposed New Work: Show layout of all new equipment. Provide narrative descriptions, details, and cross-sections of the proposed work as necessary to explain the project. All details shall indicate the difference between new and existing construction.

11. The government requires that the new equipment proposed by the contractor shall have the capability of being serviced locally. Equipment that does not have adequate local support shall be indicated to the COR/COR for review / approval12. The new RTUs are required to be connect to a building automation system (BAS); however, they should also have remote control / monitoring panels located within each building. Remote panels shall allow viewing of RTU parameters / operating conditions and shall allow adjustment of set points.

Existing Equipment Modification / Removal / Demolition Requirements:

1. General: The contractor shall provide all means to shut-down equipment, isolate equipment, drain down, flush and refill the systems, and lock-out/tag-out systems as required to safely complete the specified tasks.

2. Remove the three (3) existing York RTUs and Accessories: Expect work to take place on one building at a time, unless otherwise noted. The contractor shall remove the existing York RTUs.

Removal shall include any misc. ductwork/duct connections, electrical circuiting/breakers, controls wiring/devices, and piping that will not be used as part of the new work. The contractor shall try to keep infrastructure in place that can be reused as part of the new work tasks; however, devices associated with the RTU’s shall be replaced with new, such as condensate p-traps, natural gas pressure regulators, natural gas manual shut-off valves, natural gas dirt-legs, programmable thermostats, etc. 1. The contractor shall install three (3) new RTU’s and all necessary mechanical and electrical accessories to provide a fully functioning system that meets the project requirements.

Contractor shall modify and install flashing on existing roof curbs as necessary to accommodate new RTU’s.

New Equipment and New Work Requirements – General Descriptions

New RTUs:

Requirement Summary:

2. The contractor shall provide new controllers/programmable thermostats, sensors, wiring, and necessary devices.

3. Perform air-side test, adjust, and balance (TAB) procedure on all three (3) new RTU’s.

ii. New Equipment Summary:

(Manufacturer/Model substitutions shall meet or exceed the York Series Equipment. Substitutions are subject to approval by the PD/COR, FM, and FAC/PS Mechanical Engineer. If a substitution is accepted, the contractor is responsible for any curb/roof/flashing modifications. If curb adapters are to be provided, the contractor shall provide detailed/dimensioned drawings for review by FM and PD/COR.)

1. Workshop and warehouse building:

Two (2) New Constant Volume Roof Top Units

Unit Features.

• Basis of Design: York series 20

• Workshop & Warehouse RTU shall have 150.000 BTU cooling capacity.

• Electrical System: 460V, 3 Wire, 60 Hz

• Return air filters shall be MERV 8 minimum.

• RTUs shall be Constant Volume

• RTUs shall be furnished with motor operated outdoor air (OA) dampers and associated controls.

Outdoor air dampers shall open to the balanced set point during occupied hours but remain closed during unoccupied hours.

• Ductwork shall match existing configuration. New RTU shall sit directly on existing to remain RTU roof curb.

• Unit Cabinet Constructed of Powder Painted Steel, Certified At 1000 Hours Salt Spray Test (ASTM B-117 Standards).

• Through-the-Curb and Through-The-Base Utility Connections

• Either Supply and/or Return can be Field Converted from Vertical to

• Horizontal Configuration without Cutting Panels

• Full Perimeter Base Rails with Built in Rigging Capabilities

• Hinged & Tool Free Filter, Blower, Motor and Electrical Access Panels

• Stainless Steel Drain Pan

• Dual Refrigerant Circuits for Efficient Part Load Operation with Scroll Compressors

• Two Stage Cooling

• Solid Core Liquid Line Filter Driers

• Techni coat (or equivalent to) Copper Tube/Copper Fin Condenser Coil

• Techni coat (or equivalent to) Copper Evaporator/copper fin Coil

• No Factory Installed Electric Heat

• High Static Belt Drive Blower

• HACR Circuit Breaker/Disconnect

• Powered Convenience Outlet (110 VAC / 15 Amp)

• Phase Monitor

• BAS Ready Economizer with Barometric Relief (Bottom Return Only)

• Coil Guard

• An Integrated Low-Ambient Control, Anti-Short Cycle Protection, Lead-Lag,

• Fan on and Fan off Delays, Low Voltage Protection, On-Board Diagnostic and Fault Code Display.

• Safety Monitoring - Monitors the High and Low-Pressure Switches, the Freeze stats, the Gas Valve, if Applicable, and the Temperature Limit Switch on Gas and Electric Heat Units. The Unit Control Board Will Alarm on Ignition Failures, Safety Lockouts and Repeated Limit Switch Trips.

Warranty

• One (1) Year Limited Warranty on the Complete Unit

• Five (5) Year Warranty - Compressors and Electric Heater Elements

Gym building:

One (1) New Constant Volume Roof Top Units

Unit Features

• Basis of Design: York Series 20

• Workshop RTU shall have 80000 BTU cooling capacity.

• Electrical System: 460V, 3 Wire, 60 Hz

• Return air filters shall be MERV 8 minimum.

• RTUs shall be Constant Volume

• RTUs shall have adjustable barometric relief for space pressurization control, to include all related control equipment e.g., dampers and sensors.

• RTUs shall be furnished with motor operated outdoor air (OA) dampers and associated controls.

Outdoor air dampers shall open to the balanced set point during occupied hours but remain closed during unoccupied hours.

• Ductwork shall match existing configuration. New RTU shall sit directly on existing to remain RTU roof curb.

• Unit Cabinet Constructed of Powder Painted Steel, Certified At 1000 Hours Salt Spray Test (ASTM B-117 Standards)

• Through-the-Curb and Through-the-Base Utility Connections

• Full perimeter base rails with built in rigging capabilities

• Hinged Access Panels

• Slide-Out Stainless-Steel Drain Pan

• Scroll Compressors

• Two Stage Cooling

• Solid Core Liquid Line Filter Driers

• Techni coat Copper Tube/copper Fin Condenser Coil

• Techni coat Copper Tube/copper Fin Evaporator Coil

• Slide-out Blower/3 HP Belt Drive Motor Assembly

• Single Point Power Connection

• Non-Fused Disconnect Switch

• Powered Convenience Outlet (110 VAC / 15 Amp)

• Phase Monitor

• BAS Ready Economizer w/Barometric Relief (Bottom Return Only)

• Coil Guard

• Safety Monitoring - Monitors the high and low-pressure switches, the freeze stats, the gas valve, if applicable, and the temperature limit switch on gas and electric heat units. The unit control board will alarm on ignition failures, safety lockouts and repeated limit switch trips.

Warranty

• One (1) Year Limited Warranty on the Complete Unit

• Five (5) Year Warranty - Compressors and Electric Heater Elements

1. Electrical: Circuit Breaker and Conductors

- Contractor shall provide new fused disconnects for all roof top units and shall be sized per manufacturer’s recommendations. Enclosures and conduit shall be rated for outdoor applications.

2. Contractor shall connect new RTU to existing building ductwork system through existing roof penetrations. Install new electrical conduit / conductors between new RTU and existing main electrical distribution panel also located on same roof. Contractor shall install new controls.

3. STARTUP SERVICE

Complete installation and startup check according to manufacturer's written instructions and dothe following:

1. Inspect for visible damage to unit casing.

2. Inspect for visible damage to compressor, coils, and fans.

3. Inspect internal insulation.

4. Verify that labels are clearly visible.

5. Verify that clearances have been provided for servicing.

6. Verify that controls are connected and operable.

7. Verify that filters are installed.

8. Clean condenser coil and inspect for construction debris.

9. Remove packing from vibration isolators.

10. Inspect operation of barometric relief dampers.

11. Verify lubrication on fan and motor bearings.

12. Inspect fan-wheel rotation for movement in correct direction without vibration and binding.

13. Adjust fan belts to proper alignment and tension.

14. Start unit according to manufacturer's written instructions. a. Start refrigeration system.

b. Do not operate below recommended low-ambient temperature.

c. Complete startup sheets and attach copy with Contractor's startup report.

15. Inspect and record performance of interlocks and protective devices; verify sequences.

16. Operate unit for an initial period as recommended or required by manufacturer.

17. Calibrate thermostats.

18. Inspect outdoor-air dampers for proper stroke and interlock with return-air dampers.

19. Start refrigeration system and measure and record the following when ambient is a minimum of 15 deg F above return-air temperature:

Coil leaving-air, dry- and wet-bulb temperatures.

Coil entering-air, dry- and wet-bulb temperatures.

Outdoor-air, dry-bulb temperature.

Outdoor-air-coil, discharge-air, dry-bulb temperature.

20. Inspect controls for correct sequencing of heating, mixing dampers, refrigeration, and normal and emergency shutdown.

21. Measure and record the following minimum and maximum airflows. Plot fan volumes on fan curve.

Supply-air volume.

Return-air volume.

Relief-air volume.

Outdoor-air intake volume.

22. Simulate maximum cooling demand and inspect the following:

Compressor refrigerant suction and hot-gas pressures.

Short circuiting of air through condenser coil or from condenser fans to outdoor air intake.

23. Verify operation of remote panel including pilot-light operation and failure modes.

Inspect the following:

Low-temperature safety operation.

Filter high-pressure differential alarm.

Economizer to minimum outdoor-air changeover.

Relief-air fan operation.

24. After startup and performance testing and prior to Substantial Completion, replace existing filters with new filters.

Test, Adjust, and Balance (TAB):

Installation and Commissioning of the 3 Curb-Mounted Rooftop Units (RTUs)

Pre-Installation Phase

Site Survey and Assessment:

Conduct a thorough site survey to assess existing conditions and confirm the suitability of the current RTU curbs for the new units.

Verify structural integrity and load-bearing capacity of the curbs.

Review architectural and engineering drawings to ensure compatibility with new RTUs.

Permitting and Approvals:

Obtain necessary permits and approvals from local authorities and building management.

Ensure compliance with zoning regulations and environmental requirements.

Logistics and Preparation

Equipment Procurement:

Procure curb-mounted RTUs from approved suppliers, ensuring they are compatible with the existing curbs.

Coordinate delivery schedules to minimize disruption to ongoing operations.

Site Preparation:

Prepare the installation area by clearing debris and ensuring a clean, safe workspace.

Secure necessary equipment and tools for installation, including lifting equipment and safety gear.

Installation

Mounting and Placement:

Position each RTU on its designated curb, ensuring alignment and proper orientation as per manufacturer's guidelines.

Use appropriate lifting equipment to safely hoist RTUs onto the curbs.

Secure RTUs to curbs using recommended anchoring methods to withstand wind and weather conditions.

Connections and Integration:

Connect RTUs to existing ductwork, electrical supply, and control systems.

Install weatherproofing seals and flashings around RTU bases to prevent water ingress.

Ensure all connections are secure and properly insulated to maintain energy efficiency.

Commissioning

Startup and Testing:

Conduct initial startup of each RTU to verify functionality and operational readiness.

Perform system tests to check airflow, temperature control, and sensor calibration.

Adjust settings and configurations as necessary to optimize performance and efficiency.

Documentation and Training:

Prepare commissioning reports documenting test results, adjustments made, and operational parameters.

Record equipment specifications, serial numbers, and warranty information for future reference.

Provide training to facility personnel on RTU operation, maintenance procedures, and troubleshooting techniques.

Safety and Quality Assurance

Safety Protocols:

Adhere to strict safety protocols throughout the installation and commissioning process.

Conduct regular safety inspections and toolbox talks to ensure compliance with safety standards.

Quality Assurance:

Implement quality assurance checks to verify workmanship and adherence to manufacturer's guidelines.

Address any issues or concerns promptly to maintain project timelines and quality standards.

Project Management and Coordination

Project Oversight:

Assign a dedicated project manager to oversee installation progress and coordinate with stakeholders.

Schedule regular progress meetings to review project status, budget, and timelines.

ATTACHMENTS

Exhibit A: Photos of existing conditions/equipment:

Roof top unit 1

Roof top unit 2

Roof top unit 3

Exhibit B: Existing York RTU literature, Exhibit C: sketches of demolition and new work requirements

RTU 1 & 2

RTU 3

Exhibit D: Construction specifications.

Choose applicable specifications….

• OBO Specification Section 230519 – METERS AND GAGES FOR HVAC PIPING (January 2012)

• OBO Specification Section 230523 – GENERAL-DUTY VALVES FOR HVAC PIPING (January 2012)

• OBO Specification Section 230529 – HANGERS AND SUPPORTS FOR HVAC PIPING AND EQUIPMENT (January 2012)

• OBO Specification Section 230548 – VIBRATION AND SIESMIC CONTROLS FOR HVAC PIPING AND EQUIPMENT (January 2012)

• OBO Specification Section 230593 – TESTING, ADJUSTING, AND BALANCING FOR HVAC (January 2012)

• OBO Specification Section 230719 – HVAC PIPING INSULATION (January 2014)

• OBO Specification Section 230905 – INSTRUMENTATION AND CONTROLS FOR HVAC (January 2015)

• OBO Specification Section 232113 – HYDRONIC PIPING (January 2012)

• OBO Specification Section 232500 – HVAC WATER TREATMENT (January 2012)

• OBO Specification Section 236423 – SCROLL AIR-COOLED WATER CHILLERS (January 2012) DUPLICATE

CHILLER SPEC

• OBO Specification Section 236424 – MODULAR SCROLL AIR-COOLED WATER CHILLERS (January 2015)

DUPLICATE CHILLER SPEC

• OBO Specification Section 260505 – COMMON WORK RESULTS FOR ELECTRICAL, COMMUNICATIONS AND ELECTRONIC SAFETY (January 2016)

• OBO Specification Section 260519 – LOW-VOLTAGE ELECTRICAL POWER

CONDUCTORS AND CABLES (January 2012)

• OBO Specification Section 260525 – GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS (January 2012)

• OBO Specification Section 260534 – RACEWAYS AND BOXES (January 2012)

• OBO Specification Section 260553 – IDENTIFICATION FOR ELECTRICAL (January 2012)

• OBO Specification Section 262923 – VARIABLE FREQUENCY MOTOR CONTROLLERS (January 2012)