Attachment 1_PWS_1305M320QNWWP0038.pdf

1305M320QNWWP0038

ATTACHMENT – 1 - PWS

Performance Work Statement (PWS)

Computer Room Air Conditioning Units Replacement

Weather Forecast Office – Brownsville, TX

Background:

The National Weather Service (NWS) Weather Forecast Office (WFO) located in Brownsville, TX (BRO) are in need of replacement of its Computer Room Air Conditioning (CRAC) units. The existing Liebert units have deteriorated to the point that replacement is the best option. The Equipment Room uses these units for critical cooling and is vital to daily operations. During a recent Facility Conditioning Assessment the CRAC units were reported to be in need of replacement.

Objective:

Replacement of the CRAC units to current standards and the return the WFO Equipment Room to proper operation level.

Scope:

Provide all labor and materials to replace existing CRAC units with new systems serving site Equipment, Electric, and Communications Rooms. Based upon estimated heating & cooling loads, Brownsville will require 10 ton Liebert, or equivalent systems. Equivalency will be based upon system performance, reliability, energy efficiency, footprint, and warranty. Perform cooling load calculations for BRO site and size new equipment to meet demand in all seasons. Systems must continually maintain rooms between 65-74 degrees Fahrenheit and 45-55% Relative Humidity. All new systems must have N+1 redundancy to ensure system availability in the event of component failure. Components (N) must have at least one independent backup component (+1). New system must automatically transfer to the backup unit upon primary system failure to maintain set point. New systems must automatically switch lead system to lag each month to balance operating hours between primary and standby systems. Enable monitoring and control of new systems through integration with existing Building Automation System. Refer to as-built mechanical drawings for original installation. (Copies available upon request) Heating and cooling must be maintained in the Equipment room 24 hours x 7 days per week without interruption.

Tasks:

The Contractor Shall:

Perform heating and cooling load calculations for BRO site and size new HVAC equipment to meet demand for all seasons in accordance with ACCA Manual J.

Remove two existing 10 ton Leibert units

Recover all refrigerant in compliance with current EPA and industry standards

Inspect and repair or replace electrical and control wiring, to support new Liebert (or equivalent) units.

Replace existing refrigeration copper lines with rough service insulated copper line sets.

Line sets shall be sleeved and sealed at wall or floor penetrations, per Manufacturer and 2018 UMC code.

Provide and install new Liebert (or equivalent) units and all appurtenances necessary to deliver a fully functional system.

Install and set iCOM control system to run one Liebert unit (or equivalent) as primary and one unit as backup. Provide capability to alternate lead and lag systems to balance total operating hours.

Provide system equipment to maintain room temperature and humidity between 65-74 degrees F and 45-55 percent relative humidity.

Incorporate infrared humidifier with 11 lb./hr. capacity and downflow configuration with electrically commutated, variable speed fans on each unit

Provide electrically commutated, variable speed fans for each condenser unit

Install equipment grounding in compliance with National Weather Service Manual 30-4106 (available upon request)

Setup and perform functional tests validating smooth transition from primary to backup units.

Provide manufacturer’s design and commissioning standard or equivalent compliant with ACCA standards.

Provide proof of warranty registration within 90 days of installation.

Dispose of all construction debris off site and return all work areas to a clean, operational condition

Ensure computer room has cooling through duration of project. Either by phasing replacement or providing temporary cooling.

Provide 8 hours of training and maintenance information to local staff.

Set sequencing of units to ensure smooth changeover of lead system to lag system each month to balance operating hours.

Install units such that they discharge cold air out the bottom and the plenum used for conditioned air distribution is the space between the concrete slab and the raised computer flooring. The return air intake must be at the top of the HVAC unit. The computer server racks receive conditioned air from under the floor and exhaust air out the top. All units must be able to provide this exchange of air from the floor up to establish cooling of the IT equipment in the room.

Install new Liebert (or equivalent) units and appurtenances to deliver a fully functional HVAC system.

Alternative cooling approaches will be considered.

Site Indoor Model Quantity Service Outdoor Model Quantity Service Brownsville DS035AD 1 Primary MCL110E8 with E-

Coat 1 Primary

Brownsville DS035AD 1 Backup MCL110E8 with E- Coat

1 Backup

Current Unit Serial Numbers:

Model No. FH125AUAAM; Serial No. 310585-001

Model No. FH125AUAAM; Serial No. 310585-002

Project Warranty:

Contractor shall provide a written warranty for the installed system for a period of (1) one for year parts and

(1) one year for labor from the date of acceptance. Any additional warranty periods provided by the unit manufacturer must be provided with the quote.

Hours of Operation:

Work shall be performed between 7:00am & 5:00pm Monday thru Friday unless otherwise approved by the COR. Contractor agrees to observe all Federal Holidays, and any other day off work designated by Federal Statute, Executive Order, or Presidential Proclamation:

Performance Requirement Summary:

Task Performance Objective Acceptance Quality Method of Surveillance Installation Install during POP Install according to manufacturer’s recommendations

Inspection

Testing System operates smoothly System Meets Cooling Requirements with proper lead/lag

Inspection

Training 8 Hours of Training Staff Understand Operations

Trained Staff Review

Disposal Dispose of material as required

Dispose of material as required

Contractor to certify disposal