1960: Building on refrigeration component developments following the Second World War, from the beginning of the 1960s, �VEB Maschinenfabrik Halle� began production of a range of compact system sets consisting of a reciprocating piston compressor; shell-and-tube apparatus and containers (liquid collectors, intermediate coolers; oil separators) (Figure 9).
In addition, development and construction of large absorption plant with NH3 and H2O as coolants began with output ranges between 100,000 kcal/h to 5 million kcal/h. These were primarily intended for use in the chemical industry.

1962: �VEB Maschinenfabrik Halle� was assigned to �VVB Chemie- und Klimaanlagen� with head office in Berlin.
Beginning in the years up to 1968, �VEB Maschinenfabrik Halle� developed the �Series 2� reciprocating piston compressor (HKV) with swept volumes ranging from 160 to 900 m3/h. (Figure 10)
These were fast-running single-stage open and semi-hermetic (hh) reciprocating piston compressors. The semi-hermetic compressors had flange-mounted, statically sealed built-in motors. The rotors were fixed to the crankshaft with cantilevered bearings. This meant a dynamic seal (mechanical shaft seal), as in open compressors, was no longer necessary. The HKVs were equipped with power control and start-up relief. For this purpose, each cylinder had a concentric working valve with hydraulic lifting of the suction valve plate.
These compressors were mainly used for brine and fresh water cooling systems using the coolants NH3 and R12 in the chemical and pharmaceutical industry, the food industry and fish processing industry.
The most important markets at this time were: the GDR, USSR, UAR/Egypt, China, Syria, Albania, Greece, Bulgaria and Iceland. With effect from 30 June 1963, �VVB Chemie- und Klimaanlagen� was dissolved and the chemical plant and refrigeration equipment were separated. At the same time, �VVB Luft- und K�ltetechnik� was established with head office in Dresden. The �Institut f�r Chemie- und K�lteausr�stung� (institute for chemical and refrigeration equipment) was dissolved and separate research facilities were created.

1964: With the establishment of the �Institut f�r Luft- und K�ltetechnik� (institute for ventilation and refrigeration engineering) and concentration of the research and testing potential at the Dresden location, the refrigeration engineering field office in Merseburg was shut down and some of the personnel were transferred to Dresden. The rest of the workforce and the whole building complex, including prototype building and the testing site, were taken over by MAFA and it�s main research and development department was then set up there.
Starting in 1964, the KSA range of refrigeration sets and VSA range of condensing sets for the coolant NH3 and VS evaporation sets for the coolant R22 were developed together with the �Series 2� HKVs.

1965: �VEB Maschinenfabrik Halle� was assigned to �VVB Luft- und K�ltetechnik� with head office in Dresden. The increasingly extensive and specific enquiries and orders and increasing output and efficiency requirements made of the products and systems continuously changed the service and production profile to date. This development also influenced the company structure and scope of production work. Consequently, main departments were formed which dealt with all aspects of the orders; from the contract award through to production of the products or installation of the plant and putting into service the products and systems.

1966: On 9 December 1966, the trademark association �Luft- und K�ltetechnik e.V.� was established. MAFA Halle was one of its founding members. It was not until the 1970s that the trademark was named �ILKA�.
The 1960s were very much characterised by the cessation of imports from the non-socialist economic system as instructed by the government.
This lead to a considerable upturn in research at universities, institutes and technical colleges and research and development in the firms.

1967: The operation in D�llnitz was bought for the purpose of large-scale production of chilled water sets and refrigeration packages of all designs. The production line developed by MAFA Halle for the production of complete connecting rods was set up in the D�llnitz part of the business. During this time a ZKSA (refrigeration sub-system) range of �NH3 forced circulation refrigeration packages� were developed for single and two-stage operation with the �Series 2� HKVs. (Figure 12) The chilled water sets (KWS) were complete, ready for connection, compact refrigeration systems for both open and for semi-hermetic (hh) HKVs, with shell-and-tube heat exchangers (according to the hairpin principle) with electric power and control unit for fully-automatic operation. They had a cooling output of between 60,000 and 400,000 kcal/h under ambient conditions. � Picture subtitles Fig. 5: AVE 4,5/150 Fig. 6: HKV BR2� 2VV8/100-11 Fig. 7: KSA 600-45 Fig. 8: ZKSA 600/640-110

1970: With effect from 1 January 1970, �VVB Luft- und K�ltetechnik� was reformed as �VEB Kombinat Luft- und K�ltetechnik� with head office in Dresden. As a result, �VEB Maschinenfabrik Halle� was also integrated in this collective combine.

1971: Starting in 1971 through to 1980, the series (BR) 5 reciprocating piston compressors were developed. Starting with the output and use parameters of that time for reciprocating piston compressors (HKV) it became obvious that the characteristics of the series 1 and 2 HKVs needed improvement.
By optimising the cyclic process and reducing the mechanical power dissipation the overall efficiency was increased by up to 30% compared to the series 2 compressors.
The series 5 HKVs replaced the series 0 and 1 HKVs. The series 2 HKVs were revised and partly incorporated in the series 5 range.
These were single-stage open and semi-hermetic (hh) and two-stage open water and air-cooled reciprocating piston compressors. The semi-hermetic version and the power control and start-up relief principle corresponded to that of series 2. The following types were developed:
- 2V4 100, 2W6 100 open and semi-hermetic(Explanation�of�the type designation: 2 = series; V = cylinder arrangement; 4 = number of cylinders; 100 = piston diameter) - 5W6 100, 5VV8 100 open and semi-hermetic
- 5VV8 100 - 2 open
- 5W6 140, 5VV8 140 mm open
- 5W6 200, 5VV8 200 open, for NH3 only
- 5VV8 200 - 2 open for NH3 only
With the series 5 100 and 140 range compressors, compressor units (VE) with swept volumes ranging from 160 to 900 m3/h were designed.
These consist of a compressor, electric motor and oil separator with automatic oil return and electric wiring up to the �terminal box on a common base frame. The 6 basic types of open ammonia compressors were combined with motors having different outputs and speeds.
The compressor units (VE) were combined with appropriate separator-collector condenser units (AVE) for refrigeration plant.
During the period from 1972 to 1976 the services provided were concentrated on the following:
- Food industry� Series 1 and 2 HKVs, compressor units, ammonia condenser sets, ammonia refrigeration packages; forced circulation refrigeration sets and other refrigeration equipment for cold stores, dairies, slaughterhouses, meat processing and sausage-making factories in the USSR, Hungary, Hamburg, Bremerhaven, CSSR, Poland, Bulgaria, Belgium, Greece, Albania, Yugoslavia, Turkey, Cyprus, Iraq, Iran, China and Cuba
- Cooling for air conditioning systems� Chilled water sets with series 2 HKV: West Germany, West Berlin, Austria, France, Hungary, Holland, England, CSSR, Poland, Bulgaria and Rumania
- Artificial ice rinks� Refrigeration equipment for 3 facilities in Yugoslavia; refrigeration equipment for Seefeld / Austria, SEZ sport and leisure centre in East Berlin
The latter two projects involved artificial ice rinks combined with heat pump operation for swimming pool heating (cold-heat coupling).