Reason for 4th amendment is to provide additional time for timely quote submittals. Reason for amendment is to clarify the specification details for each model requested. Provide 4 VRF Condensing Units. Minimum the equipment shall include - Power 460V, 3PHASE,60Hz, in total it should equal to 38 TONS of cooling capability, self contained high and low pressure controls, Refrigerant R410A, and blue fin anti-corrosion protection. Delivery shall include crane service for the unloading of the equipment at the site and start up. One model similar or equal to PUHY-EP96YNU-A1 shall be 8 TONS and the other 3, model similar or equal to PUHY-EP120YNU-A1, shall be 10 TONS each.