Attachment 1_SOW Install Trane Chiller_Redacted.pdf

Statement of Work

Install USDA Supplied RTAF -230 Ton Chiller

Thad Cochran Southern Horticulture Lab Poplarville, MS

Asset ID: 640400B038

Prepared by:

Table of Contents

Statement of Work Page 3

Contractor Requirements Page 3

USDA Furnished Chiller Specifications Page 4

Project Schedule Page 11

Project Contacts Page 12

Statement of Work: Provide all personnel, equipment, tools, materials, supervision, and quality control necessary to perform removal and disposal of the existing chiller and perform installation and start-up of a new, USDA provided Trane 230 ton RTAF Air-Cooled Chiller as defined in this Statement of Work (SOW). New Chiller is currently at the installation site at 810 Hwy 26W, Poplarville, MS 39470

Project Objective: To provide the USDA-ARS TCSHL with proper cooling through the removal of the existing faulty chiller and installation of a new, fully functional chiller.

Background: The USDA ARS TCSHL Is located at 810 Hwy 26W, Poplarville, MS 39470. The existing Trane (model RTAF chiller) chiller was commissioned in 2005. The existing chiller is beyond its expected life, no longer under warranty, and is not capable of cooling the building in its current state and needs replacement. USDA procured the desired chiller due to extremely long lead times so that it wouldn’t be an issue for the installation contractor.

Scope of Work:

Furnish all personnel, equipment, tools, materials, supervision, and quality control necessary to perform removal and disposal of the existing chiller and install a new USDA provided chiller as defined in this

SOW.

Contractor Requirements:

The contractor Shall:

• Possess all appropriate valid and current HVAC license(s) from the State of Mississippi.

• Disconnect and remove, using contractor provided rigging and crane, the existing air-cooled chiller and all associated components required for the installation of the new chiller system and dispose of properly and legally at an off-site location.

• Install the new USDA provided air-cooled Trane chiller ( RTAF-230) in accordance with all manufacturer's requirements and recommendations to include proper refrigerant

• Provide all labor and materials to perform startup. Startup shall be performed by a factory-trained technician from the original equipment manufacturer (OEM). Technician shall confirm that equipment has been correctly installed and passes specification checklist prior to equipment becoming operational and covered under OEM warranty. This shall be done in strict accordance with manufacturer's specifications and requirements. Third-party service agencies are not permitted.

• A start-up log shall be furnished by the factory approved start-up technician to document the chiller's start-up date and shall be signed by the owner or his authorized representative prior to commissioning the chillers.

• In addition to the manufacturer’s warranty, the contractor shall provide a minimum 1 year parts and labor warranty on all components used in the installation.

• Provide and install all necessary electrical components, wiring, and connections.

• Provide and install all necessary mechanical piping to allow for proper start-up, loop chemical balance testing, and flow balancing. Supply and return chilled water piping shall include air vents, pressure gauges w/ shutoff valves, thermometers, flow meters, isolation valves, balancing valves, relief valves and/or any other devices/materials specified in the chiller manufacturer’s installation instructions. All exposed piping is to be properly insulated and heat traced.

• Perform leak test and check for proper operation.

• Integrate new chiller into the present HVAC Controls system.

• Provide all operations and maintenance manuals to owner representative prior to close out of contract.

• Existing concrete pad is to be re-used.

Specifications of the USDA furnished Trane Chiller

Description

• Chiller shall be air cooled with variable compressors as shown as scheduled on this document.

The chiller shall be installed in accordance with this specification and perform at the specified conditions as scheduled.

Operation

• Chiller shall be able to start and operate in ambient conditions from 0F – 125F. Wide ambient operation is accomplished with factory installed ant tested protection. If field installed wide ambient solution is used, this shall be purchased and installed at contractor expense.

• Chiller shall be capable of operating with a leaving solution temperature range of 40F – 65F without use of glycol.

• Chiller shall be capable of starting with 95F entering fluid temperature to the evaporator.

• Chiller shall provide evaporator freeze protection and low limit control to avoid low evaporator refrigerant nuisance trips during critical periods of operation. Whenever this control is in effect, the controller shall indicate that the chiller is in adaptive mode; if low ambient/freeze conditions exist longer than 30 seconds, a limit warning alarm shall energize.

• Rapid restart after power restoration. Chiller shall be capable of starting in 45 seconds.

Compressors

• Compressors shall be variable speed compressors

• Provide direct drive motor cooled by suction gas with only three major moving parts and a completely enclosed compression chamber that leads to increased efficiency.

• Each compressor shall have internal overload protection.

• Each compressor shall include centrifugal oil pump, oil level sight glass and oil charging valve.

• Each compressor shall have crankcase heaters installed and properly sized to minimize the amount of liquid refrigerant present in the oil sump during off cycles.

Fans

• Low sound fans shall be dynamically balanced and direct driven.

• All condenser fan TEAO motors shall have permanently lubricated ball bearings and external overload protection.

Condenser

• The condenser coils shall consist of copper tubes mechanically bonded into plate type aluminum fins.

• The condenser coils shall have an integral sub-cooling circuit and shall be designed for at least 650 psig working pressure, leak tested at 650psig.

Chiller Construction

• Frame, panels, and access doors shall be constructed of galvanized steel.

Chiller Mounted Starter

• The starter shall be across-the-line configuration, factory mounted and fully prewired to the compressor motors and control panel.

• Units shall have single point power connection.

• Control power transformers shall be factory installed and wired.

• Control panel shall be dead front construction for enhanced service technician safety.

• Unit wiring shall be run in liquid tight conduit.

• Power line connection shall be standard with a terminal block.

Refrigerant Circuit

• Chiller shall have 2 refrigerant circuits, each with two manifolded compressors.

• Each refrigerant circuit shall include:

o Liquid line shutoff valve o Discharge service valve o Filter o Liquid line sight glass o Electronic expansion valve sized for maximum operating pressure o Charging Valve

• Full operating charge of R410A and oil.

Controls

• Controls shall be factory mounted to the control panel door.

• Operator interface shall have an LCD touch screen display.

• The display shall include a menu driven interface with touch screen navigation to organized sub-system reports for compressors, evaporators, motor information, and diagnostics.

• The interface shall provide password protection of all setpoints.

• The chilled water temperature control shall be microprocessor based and show water and refrigerant temperatures, refrigerant pressure, and diagnostics. The control shall be supplied with the chiller by the manufacturer.

• The front of the chiller control panel shall display the following without codes, tables, or gauges:

o Run time o Number of starts o Current operating mode o Chilled water setpoint and setpoint source o Electrical current limit setpoint and setpoint source o Entering and leaving evaporator water temperatures o Saturated evaporator and condenser refrigerant temperatures o Oil pressure o Phase reversal/imbalance/single phasing and over/under voltage protection o Low chilled water temperature protection o High and low refrigerant pressure protection o Load limit thermostat to limit compressor loading on high return water temperature o Condenser fan sequencing to automatically cycle fans in response to load, expansion valve pressure, condenser pressure, and differential pressure.

o Display diagnostics o Compressor status, RLA percentage, anti-short cycle timer, and automatic compressor lead-lag.

• On chiller, mount weatherproof control panel, containing starters, power and control wiring, factory wired with terminal block power connection. Provide primary and secondary fused control power transformer.

• The chiller controller shall utilize a microprocessor that will automatically take action to prevent chiller shutdown due to abnormal conditions associated with evaporator refrigerant temperature, high condensing pressure, and motor current overload.

• Provide the following safety controls with indicating lights or diagnostic readouts:

o Low chilled water protection o High refrigerant pressure.

o Loss of chilled water flow.

o Contact for remote emergency shutdown.

o Motor current overload.

o Phase reversal/unbalance/single phasing.

o Over/under voltage.

o Failure of water temperature sensor used by controller.

o Compressor status (on or off).

• Provide the following operating controls:

o A variable method to control capacity to maintain leaving chilled water temperature based on PI algorithms. Five minute solid state anti-recycle timer to prevent compressor from short cycling. Compressor minimum stop-to-start time limit shall be 2 minutes. If a greater than 5 minute start-to-start, or greater than 2 minute stop-to-start timer is included, hot gas bypass shall be provided to insure accurate chilled water temperature control in light load applications.

o Chilled water pump output relay that closes when the chiller is given a signal to start.

o Load limit thermostat to limit compressor loading on high return water temperature to prevent nuisance trip outs.

o High ambient unloader pressure controller that unloads compressors to keep head pressure under control and help prevent high pressure nuisance trip outs on days when outside ambient is above design.

o Compressor current sensing unloader chiller that unloads compressors to help prevent current overload nuisance trip outs.

o Low ambient lockout control with adjustable setpoint.

o Condenser fan sequencing which adjusts the speed of all fans automatically in response to ambient, condensing pressure and expansion valve pressure differential thereby optimizing chiller efficiency.

• Provide user interface on the front of the panel. If display is on the inside of the panel, then a control display access door shall be provided to allow access to the display without removal of panels. Provide user interface with a minimum of the following features:

o Leaving chilled water setpoint adjustment from LCD input o Entering and leaving chilled water temperature output o Pressure output of condenser o Pressure output of evaporator o Ambient temperature output o Voltage output o Current limit setpoint adjustment from LCD input.

• The chiller control panel shall provide leaving chilled water temperature reset based upon return water temperature.

• The chiller control panel shall provide an alarm relay output that shall energize whenever a fault requiring manual reset is detected by the panel.

• Chiller shall have full architectural louvers panels.

• Chiller shall ship with elastomeric isolators

USDA Furnished Chiller

Existing Chiller

Utilization of Bio-Based Products: The contractor shall make every effort to utilize products and material based from bio- based materials as applicable, (e.g. bio-based greases; bio-based hydraulic fluids, bio-based absorbents), to the maximum extent possible without jeopardizing the intended end use of detracting from the overall quality delivered to the end user. All supplies and materials shall be of a type and quality that conform to the applicable Federal Specifications and Standards. All supplies and materials to be used in the performance of work described herein are subject to the approval of the Contracting Officer Representative (COR). Products can be found at: www.biopreferred.gov

Material / Submittals:

The material for the entire project shall include but are not limited to those detailed above necessary to successfully complete the project and deliver a functioning system as required. Submittals on all material, including shop drawings and specifications used on this project shall be submitted to the EPM and COR.

Electronic submittals are acceptable otherwise three written submittals are required.

Damage to Property:

Any damage to the Government buildings, utilities, etc. caused as the result of the contractor’s activities shall be repaired or replaced to the satisfaction of the Government.

Inspection and Acceptance:

A government representative shall inspect and approve the work performed on this project. The Contractor shall schedule inspection a minimum of 10 days in advance, in writing, to the Contracting Officer.

Project Schedule:

The completion of this project shall not exceed 30 days from date of contract award. A request for time extension must be submitted to the Contracting Officer in writing. Each request must include specific and detailed reasons in support of the schedule alteration.

Work Hours:

Contractor work hours shall be Monday through Friday, eight (8) A.M. to five (5) P.M. with the exception of Government holidays. Any changes to work schedule shall be submitted to Contacting Officer for written approval prior to schedule change.