HVAC Replacements

Amendment 01 is being issued to correct the model information of the RTU for Bldg 16 as well as clarify requirements for the crane.  See the attached amendment for complete details.

Project consists of the removal, disposal and replacement of two R-410A roof top units as described below.  One 40 ton unit is required for the Building 16 Dining Facility and one 12.5 ton unit is required for Building 25 Civil Engineering.    

Building 16 Dining Facility:

Contractor will install one new rooftop unit (RTU).  Unit shall be a York model number RZ4N852ABE, or equal, with 4 stages, a total 40 ton cooling capacity and 800,000 BTU input heating capacity.  Energy Efficiency Ratio (EER) shall be a minimum of 10.7.  Unit will be 208 voltage 3 phase.

Building 25 Civil Engineering Squadron:

Contractor will install one new RTU.  Unit shall be a Bryant model number 580JP14D224A, or equal, with 2 stages, a total of 12.5 ton cooling capacity and 150,000 BTU input heating capacity.  EER shall be a minimum of 10.8.  Unit will be 208 voltage 3 phase.   Previous unit in this location was a cooling unit only.  New unit is both cooling and heating.  Installation will require connection to a nearby gas line, approximately 10 feet away.

For both building locations, the existing disconnects are to remain and be reused. New units are to utilize R-410A refrigerant.   Base direct digital control (DDC) systems are to be interfaced into new unit.  Stratton ANGB utilizes Johnson Controls Metasys System. There is an existing system that can be utilized to tie in the new units. The existing units have R-410A refrigerant which will be recovered and removed.  Contractor is to abide by any and all EPA and New York State regulations.    Contractor is to provide EPA refrigerant licenses prior to commencement of work.  Refrigerant weights recovered will be annotated in the Base Refrigerant Management plan.  Government will provide forms for recording necessary information.  All existing units are to removed and disposed of properly in accordance to regulations.  Any and all penetrations are to be sealed.  Proposed models must be of equal capacity and greater efficiency than the existing models.   Modifications or replacement of roof and support structures will be done as necessary.  Curb adaptors may be necessary for both installations.  Any alterations to existing support structures must be certified by a NYS Professional Licensed Engineer and approved by the BCE.  Contractor will tie new units into base DDC System. 

Contractor is to supply a crane, or other lifting mechanism, as necessary to remove existing units and to position new units on both buildings.

Contractor to supply an extended 5 year warranty on all compressors.