250 W 57th Street:
New
a) Air conditioning systems shall be chilled water systems at the end of equipment life. Building standard VAV air handling unit (AHU) with chilled water coil and associated low and medium pressure ductwork with VAV boxes. Remove and replace all air-cooled DX units with chilled water VAV AHUs. b) Add heating coils to VAV boxes. Heating coils shall be sized for 120/110 °F. Pipe all new hot water coils to base building low temperature hot water riser. c) Provide an energy recovery ventilator (ERV) on outdoor air and exhaust. d) Provide modulating electronic control of existing steam radiators through VAV controllers and tie into base building BMS. e) Supplemental units for year-round operation shall be water-cooled DX with chilled water coils. Chilled water coil shall be piped with a modulating two-way valve for discharge air control. DX condenser shall be piped in bypass on the return with a dedicated circulator. Series piping of coil and condenser shall not exceed building standard CHW AHU pressure drop and shall provide modulating water flow in both DX and CHW modes of operation. f) Supplemental units which do not require operation during cooler weather after hours or cold winter weather may be CHW only, however cooling will not be available when the building’s chilled water loop is in overnight heating mode. The pressure drop shall match building standard CHW unit pressure drop and the control valve shall provide modulating flow.
Renewal/Retrofit
a) Air conditioning systems shall be chilled water systems at the end of equipment life. Building standard VAV air handling unit (AHU) with chilled water coil and associated low and medium pressure ductwork with VAV boxes. Any existing to remain constant volume units must be converted to single zone VAV or multi-zone VAV systems as necessary for code compliance. Constant volume control will not remain. b) Provide an energy recovery ventilator (ERV) on outdoor air and exhaust. c) Where ductwork and VAV boxes are being replaced, add heating coils to VAV boxes. Heating coils shall be sized for 120/110 °F. Pipe all new hot water coils to base building low temperature hot water riser. d) Provide modulating electronic control of existing steam radiators through VAV controllers and tie into base building BMS. e) Supplemental units for year-round operation shall be water-cooled DX with chilled water coils. Chilled water coil shall be piped with a modulating valve for discharge air control. DX condenser shall be piped in bypass on the return with a dedicated circulator. Series piping of coil and condenser shall not exceed building standard CHW AHU pressure drop and shall provide modulating water flow in both DX and CHW modes of operation. f) Supplemental units which do not require operation during cooler weather after hours or cold winter weather may be CHW only, however cooling will not be available when the building’s chilled water loop is in overnight heating mode. The pressure drop shall match building standard CHW unit pressure drop and the control valve shall provide modulating flow.
One Grand Central Place:
New (Floors 1-47)
a) Air conditioning systems shall be air-cooled VRF with condensing units located in an appropriately insulated and waterproofed MER room within the tenant area. Subject to landlord’s approval, tenant may locate condensing units in an area to be designated by
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