SCOPE OF WORK:
Executive Summary
Yeaton Associates, Inc. was engaged by the City of Nashua to develop construction documents
for the proposed HVAC renovation/upgrade at the Police Station including the pistol range. The
goal is to install a cost-effective HVAC system while meeting or exceeding the code and the
Owner's operational requirements of the project.
All new construction elements and systems will conform to the following:
e The New Hampshire State Building Code
e IBC 2015 (International Building Code)
e ECC 2015 (International Energy Conservation Code)
e |MC 2015 (International Mechanical Code)
e IPC 2015 (International Plumbing Code)
e NEC 2017 (National Electrical Code)
e ASHRAE Standards
e Local Authorities Having Jurisdiction (AHJ)
e All Other Applicable Codes, Standards and State Amendments
Mechanical Systems
The existing range air handler shall be removed from the mechanical room and replaced with a
roof top type gas fired variable air volume (VAV) unit with packaged DX cooling on the roof of the
range with side discharge ductwork. The ductwork shall be routed to the end of the building and
brought in either thru the sidewall or down through the last plank of the roof depending on the
structural requirements. The interior ductwork shall be modified as required to convert the
pistol range to a properly operating tactical range.
Any return and supply ductwork to be reused shall be thoroughly cleaned to remove dirt and
debris before restart of the system. Any new ductwork shall be made of galvanized steel and
constructed in accordance with the recommendations of the ASHRAE Guide and SMACNA Guide
(Current Edition). Any flexible ductwork shall be in lengths no greater than 5’-0” and shall not
pass through any fire rated assemblies. Flexible ductwork shall only be allowed in concealed
locations.
The existing R-22 water source heat pumps located in the 1977 portion of the building shall be
removed and replaced with new Variable Refrigerant Flow (VRF) fan coils served by an exterior
air source heat pump with heat recovery (Similar to the Trane Aurora). The new units shall match
the existing unit’s capacity and the existing ductwork shall be modified as required to install the
new heat pump.
The existing dedicated outdoor air handler located in the 1977 mechanical room shall be
removed and replaced with a new outdoor air handler heat pump with gas fired preheat. The
unit shall include an energy recovery ventilator, and variable frequency drives. The unit shall be
0292-021121 HVAC Upgrade
229 Main Street, Nashua, New Hampshire 03061 — Phone (603) 589-3330 — Fax (603) 589-3233
