NATSPEC worksections cover a wide range of chillers including those with centrifugal, screw or scroll compressors, air or water cooling and heat recovery. Absorption chillers are also included. The chiller worksections also include options for specifying requirements such as IPLV and NPLV. This TECHnote aims to help specifiers to complete the included schedules.

Note that NCC Deemed-to-Satisfy requirements deal with conventional, non-heat recovery duty and make no provision for heat recovery or gas-fired chillers which may have poorer cooling performance but better overall heating-cooling energy efficiency. Rather than using NCC Deemed-to-Satisfy values, these should be handled using NCC performance requirements verified by one of the NCC verification methods e.g. BCA J1V3 Verification using a reference building.