What is the standard tolerance on rated refrigerating capacity?

± 5% of the rated value, as per Table 2.

What information must be included on the compressor's nameplate?

Manufacturer's name, model, serial number, type of refrigerant, operating speed(s), and test pressures, as specified in Clause 9.

What are the standard rating conditions for an air-conditioning compressor using R-22?

Evaporating temperature: +7.5°C, Condensing temperature: +55°C, Suction superheat: 10K, Liquid subcooling: 5K, as per Table 1.

IS 11360

: 1985

Reciprocating Compressors for Refrigerants - Specification

CurrentSpecializedSpecificationBIMMEP · HVAC and Air Conditioning

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This standard specifies the requirements, rating conditions, testing methods, and marking for reciprocating refrigerant compressors. It covers both open-type and hermetic compressors, ensuring manufacturers provide standardized performance data for fair comparison and selection.

Specifies requirements for design, construction, performance, and testing of reciprocating compressors used in refrigeration and air conditioning systems.

Quick Reference Values

Standard suction gas superheat (Group I, II refrigerants)10 K

Standard liquid subcooling (Group I, II refrigerants)5 K

Tolerance on rated refrigerating capacity± 5 %

Tolerance on rated power input+ 10 %

High-pressure side strength test pressure1.3 x Maximum working pressure

Low-pressure side strength test pressure1.5 x Maximum working pressure

Key Formulas

Qo = m_r * (h_g - h_l) — Refrigerating Capacity Calculation from test data

Practical Notes

This standard is based on the obsolete ISO 917:1974. For modern projects, it is often supplemented by international standards like EN 12900 or AHRI standards for performance rating.

Always verify that the manufacturer's rated conditions align with the project's actual design conditions (evaporating/condensing temps). Apply corrections if there is a mismatch.

The performance and safety requirements vary significantly based on the refrigerant group. Ensure the selected compressor is appropriate for the specified refrigerant.