A. Nature of Service: 1. (a) The Contractor shall provide all labor, supervision, equipment, materials, transportation and disposal together with all incidentals necessary or required for maintenance, repair and emergency service response for the following electric centrifugal chillers at the United Nations Headquarters in New York in accordance with City, State and Federal Government laws, rules and regulations. Manufacturer Model # Serial # Rating York YD BDLDK1- CYCS SBYM - 187960 1800 tons York YK X2TRK4 - DFGS SBYM - 188130 1800 tons York YK X2TRK4 - DFGS SBYM - 188300 1800 tons (b) OPTIONAL SERVICE - The contractor shall provide cleaning of Heat Exchangers 1, 2 and 3 as specified below. Heat Exchangers 1, 2 and 3 uses river water as the primary source of heat removal and requires periodic cleaning. HX 1 GEA Serial Number: ENA-641/50002; Model Number: NA10LBYF-150; Number of plates: 593 HX 2 GEA Serial Number: ENA-641/50003; Model Number: NA10LBYF-150; Number of plates: 593 HX 3 GEA Serial Number: ENA-640/50004; Model Number: NA10SBYF-150; Number of plates: 305 (c) OPTIONAL SERVICE - The contractor shall provide Tube cleaning for the equipment specified below. Machine #1 - Carrier Chiller (1800 tons) Model#17EX4A57-599 Serial#1196J51549 Refrigerant -R 134a, 6000 lbs Compressor – Carrier, Model #17FA599, Serial#51549, RPM-7830 Machine #2 – Carrier Chiller (1800 tons) Model#17EX4857597TURBJ Serial#3998J58100 Refrigerant -R 134a, 6000 lbs Compressor – Carrier, Model #17EX597, Serial#58100, RPM-7830 Machine#3 – York Chiller (1800 tons) Model#YD BDLDK1-CYCS Serial#SBYM-187960 Machine#4 – York Chiller (1800 tons) Model#YK X2TRK4-DFGS Serial#SBYM-187960 Machine#5 – York Chiller (1800 tons) Model#YK X2TRK4-DFGS Serial#SBYM-188300