With the second world war ended the Carrier Engineering Company returned from evacuation at Boldney to resume their old offices at 24 Buckingham Gate London SW 1. Early in 1946 the question of refrigeration machine manufacture in UK caused much detailed discussion. Before the war Carrier Engineering Company had imported the compressors of the Carrier Centrifugal Refrigeration machine and the manufacture of the condenser and evaporator had been arranged in UK. However, this policy had one disadvantage in 1946 the dollar requirement for the import of the compressor. Therefore a full investigation was made of the types and sizes of compressors used in the years prior to the War with a view to the manufacture of the compressor in the UK. The investigation showed that the number of any particular type and size was low and that, therefore, the production would be one-off with the production order book not very attractive to any manufacturer.

While these centrifugal Refrigeration investigations were proceeding a visit to the United States revealed that Carrier Corporation had been concentrating during the War on the new development of absorption refrigeration. The principles of the absorption cooling cycle were recognised by Nairn as early as 1777. In 1850, Ferdinand Carré succeeded in making a continuous heat operated absorption machine using ammonia as the refrigerant and water as the absorbent. The refrigerant – absorbent combination was the only one which attained commercial importance during the 19^th and early 20^th centuries. Its popularity had declined because the use of a volatile component in the absorbent is conducive to high cost and poor efficiency and the hazardous nature had precluded its use in air conditioning. Its application had been restricted to commercial and industrial system with availability of low cost steam and in domestic refrigeration where the operating cost is not too large a factor. The Safety Car Heating and Lighting Company produced a small heat operated machine for refrigerated freight cars, using sulphur dioxide as the refrigerant and silica gel in the role of solid refrigerant.

During this period the limitations of the open type machine forced Carrier Corporation to design a closed machine with the chilled water circuit being completely within the machine thus cutting out the necessity for vacuum type connections external to the machine. The change to the closed machine 16C was made in 1956, including dispensing with the two-stage steam and water purge, replacing this with a lithium bromide solution purge and at the same time cheapening the machine construction by dispensing with a considerable quantity of stainless steel. Thirty four (34)C type machines were manufactured and installed by Carrier Manufacturing Company up to the year 1962.

Machines were designed up to 500 tons capacity.

Although in 1962 the 16E Type machine was developed, very few machines were produced either in UK or USA. In fact the next major change from the 16C Type was the 16H machine. This was a major attempt to make the machine hermetic and these latter machines were tested at Carrier Construction Company Wembley with a mass spectrometer.

Machines were now designed up to 1000 tons capacity.

From 1961 to 1971 thirty six (36) machines HA Type of various sizes were manufactured and installed while from 1971 to 1976 twenty six (26) JA Type of various sizes and sixty three (63) JB Type were manufactured and installed.