SOW_Duplex.pdf

Performance Based Statement of Work Building #948 SAMMS ASSET 10060514 -Duplex 3

5696 Beech Forest Road Patuxent Research Refuge – Laurel, MD

General Information Introduction Patuxent Research Refuge (PRR) is located along MD 197 in Laurel MD. The refuge is a unit of the US Fish and Wildlife Service, National Wildlife Refuge System. The refuge has multiple units of residential housing. This statement of work requires removal and replacement of the two air handlers and two condensing units / heat pumps that serve two floors in Duplex 3. The duplex is a two story bunkhouse with two bathrooms, a kitchen, common area and 3 bedrooms on each floor. This duplex was constructed in 2012 and one of the current HVAC systems, a Goodman heat pump has failed due to refrigerant leaks at the evaporator coil. The duplex is constructed on a crawlspace with room for HVAC mechanics to work. The air handler is currently located in a hall closet which also contains the water heater.

Background:

In order to reduce heating costs PRR has long term plans to replace inefficient HVAC systems with newer systems. Most systems will be powered by solar energy, so efficiency and reliability, are paramount.

Scope In accordance with the work requirements below, the contractor shall remove the existing HVAC systems and install two fully functioning, high efficiency systems at PRR’s Building #48

Work Requirements:

Technical requirements.

The contractor is responsible for:

1. The contractor shall be a licensed Mechanical Contractor in the state of Maryland.

All work and testing shall be in accordance with the 2021 International Mechanical Code (IMC). Duct work shall be performed in accordance with NFPA90B. Electrical work shall be in accordance with NFPA National Electrical Code / NFPA 70

2. Selective Demolitions; The contractor shall remove and legally dispose of:

• Two existing air handlers and two condensing units

• Ductwork as necessary for installation of the new system

• Refrigerant piping serving the existing units

• Electrical cables and conduit serving the existing units may be reused if in good condition.

• The existing condensing units have Pepco Energy Wise Demand control units installed.

These devices shall be reconnected to the new condensing units/ heat pumps.

3. Maintain and protect existing facilities from damage during demolition work.

• Protect building structure and interior from weather and water leakage and damage.

• Locate, identify, shutoff or disconnect utility services prior to demolition.

• Notify the facility manager in advance of demolition if the water heater(s) need to be disconnected or removed to facilitate removal of old equipment or installation of new equipment. Water heater disconnects or removal is not in the scope of this contract and will be performed by the government if necessary.

4. The contractor shall inspect buildings, perform and submit load calculations (ACCA manual N) and confirm that the following specified system will be efficient and provide adequate capacity

5. All system components shall be from the same manufacturer, including controls.

The contractor shall provide cut sheets for the following equipment (*) in advance of purchase.

The contractor shall install the following specified system in each floor of the duplex.

Inverter type 3 ton, 5 stage heat pump system capable of operating at 25-100% of capacity. Bryant, Carrier, or approved equal.

Minimum Specifications

1. Energy Star rated 23 SEER / 16 EER (seasonal energy efficiency ratio) heat pump condenser with R410 or R454b refrigerant, Inverter driven variable speed rotary compressor and cooling fans, Coils guarded by metal louvers, internal crankcase heater, diagnostics via wall control, and Energy tracking capability with outdoor temperature sensor, electronic expansion valve for heating cycle, suction and discharge temperature sensors for compressor.

2. fan coil Compatible with R410 or R454b refrigerant, Variable speed Fan Motor, 208/230Volts AC 1 Phase, 60 Hz, Single piece cabinet insulation, 30-48,000 BTU, factory installed thermal expansion valve, Internal coil shall be grooved copper tubing with aluminum fins. Maximum cabinet leakage rate of 2% when tested at 1.0 Inches of water column. Condensate pans constructed of rustproof material with brass drain connections. Minimum 40VA 208/230V transformer for accessory resistance heater. Filter access panel insulated with air seals factory installed.

3. Wi-fi digital programmable thermostat

4. 10 KW resistance heater*

5. Condenser pump ups

6. Copper line set pressure test

7. Copper line set

8. Refrigerant filter dryer

9. Adaptive sheet metal, including any ductwork, insulation, or other components necessary for a complete reinstallation of the new fan coil. One of the units is to be installed as an upflow and one is to be installed as a downflow. Each unit should have a new sheetmetal base support and Condensate overflow catch pan fabricated as part of the installation.

10. Poly pad under condenser

11. High voltage disconnect

12. High and low voltage connections.

13. UV line cover protection

14. Locking refrigerant caps

15. EZ trap condensate with float switch protection

16. Minimum 1” pleated air filter with access door, or similar air filter located in return air grill. Air filter dimensions must provide manufacturers design airflow.

17. Condensate overflow catch basin under air handler with liquid sensing shut off switch.

18. The air handler shall be raised off the floor of the catch basin to prevent rusting of housings.

19. A surge protector should be installed for each condensing unit. See photos for example.

The HVAC system shall be in compliance with the following applicable performance standards: Air- Conditioning, Heating, and Refrigeration Institute (AHRI), and the American Society of Heating, Refrigerating and Air Conditioning Engineers (ASHRAE).

Notes

• All old equipment will be removed, disposed and recycled per federal and state laws. Disposal receipts are to be submitted to the government.

• Old units must have refrigerant removed per federal and state laws

• New air handler and condensing units shall be installed in approximately the same locations as those removed. The government will construct a platform to raise the condensing unit off of the ground to prevent lawnmower damage.

• All work will adhere to local mechanical and building codes.

• If drywall or plaster needs to be cut, this contract does not include the patching which will be performed by the government.

• Access to the second floor of the unit is only by 1 flight of stairs.

• Work hours are 7AM to 3:30 PM

• Patuxent Research Refuge is a controlled access facility. Contractor employees must have identification. Employee names must be provided to COTR in advance of starting work.

• Contractor shall be required to pay Davis-Bacon Wage rates to all employees working on job.

Warranty The following minimum warranty periods must be included in the contractors pricing

• Labor for 2 years from date of installation

• Manufacturers limited parts 10 years

• Manufacturers limited compressor 10 years

• Installing Contractor is responsible for Warranty registration. Proof of registration required before final project payment is made.

Deliverables:

The contractor shall provide all labor, material, technical knowledge and expertise to meet the necessary requirements. The contractor shall remove and properly dispose of all old equipment and materials and leave the site without any debris around it. The contractor will dispose of clean scrap metal in the facilities metal recycling dumpster. Area must be clean of all rubbish caused by the installation of equipment. Provide all Operations and Maintenance Manuals to the Refuge.

Supporting Information Place of performance:

DUPLEX 3 Building 948 US FWS Patuxent Research Refuge, Laurel, MD 20708.

Special considerations

1. Normal working hours for Facility Staff are from 7:00 AM to 3:30 PM Monday through Friday except for Government holidays and special events.

2. Building is a working quarters. Coordination with tenants may be necessary.

Project Safety

The Contractor shall be responsible for strict compliance with all provisions of Occupational

Safety and Health Administration (OSHA) requirements 29 CFR 1910 and 29CFR 1926 during performance of the work.